- 1 -
W681360
3V SINGLE-CHANNEL
13-BIT LINEAR
VOICE-BAND CODEC
Data Sheet
Revision A.5
W681360
Publication Release Date: January 2011
- 2 - Revision A.5
1. GENERAL DESCRIPTION
The W681360 is a general-purpose single channel 13–bit linear PCM CODEC with 2s complement
data format. It operates from a single +3V power supply and is available in 20-pin SOG(SOP), SSOP
and TSSOP package options. The primary function of the device is the digitization and reconstruction
of voice signals, including the band limiting and smoothing required for PCM systems. The W681360
performance is specified over the industrial temperature range of –40C to +85C.
The W681360 includes an on-chip precision voltage reference. The analog section is fully differential,
reducing noise and improving the power supply rejection ratio. The VAG reference pin allows for
decoupling of the internal circuitry that generates the reference voltage to the VSS power supply ground,
minimizing clock noise on the analog circuitry when external analog signals are referenced to VSS.
The data transfer protocol supports both long-frame and short-frame, synchronous and asynchronous
communications for PCM applications. The W681360 accepts eight master clock rates between
256kHz and 4.800MHz, and an on-chip pre-scaler automatically determines the division ratio for the
required internal clock. An additional on-chip power amplifier is capable of driving 300 loads
differentially up to a level of 3.544V peak-to-peak.
For fast evaluation a development kit (W681360DK) is available.
For fast prototyping purposes a low-cost evaluation board (W681360ES) is also available.
2. FEATURES
Single +3V power supply (2.7V to 5.25V)
Typical power dissipation: 9.8mW
Standby power dissipation: 3µW
Power-Down dissipation: 0.09µW
Fully-differential analog circuit design for
low noise
13-bit linear A/D & D/A conversions with 2s
complement data format
CODEC A/D and D/A filtering compliant
with ITU G.712
Eight master clock rates of 256kHz to
4.800 MHz
256KHz – 4.8MHz bit clock rates on the
serial PCM port
On-chip precision reference of 0.886 V for
a -5 dBm TLP at 600 (436mVRMS)
Programmable receive gain: 0 to –21dB in
3dB steps
Industrial temp. range (–40C to +85C)
20-pin SOG (SOP), SSOP and TSSOP as
well as a QFN-32L package
Pb-Free / RoHS package options available
Applications
VoIP, Voice over Networks equipment
Digital telephone and communication
systems
Wireless Voice devices
DECT/Digital Cordless phones
Broadband Access Equipment
Bluetooth Headsets
Fiber-to-curb equipment
Enterprise phones
Digital Voice Recorders
W681360
Publication Release Date: January 2011
- 3 - Revision A.5
3. BLOCK DIAGRAM
256 kHz
512 kHz
1536 kHz
1544 kHz
2048 kHz
2560 kHz
4096 kHz
4800 kHz
MCLK
256 kHz
8 kHz
Pre-scaler
VDD
VSS
Power Conditioning
Voltage reference VAG
PUI
G.712 CODEC
PAO+
PAO-
PAI
RO-
AO
AI+
AI-
HB
Transmit
PCM
Interface
Receive
PCM
Interface
FST
BCLKT
PCMT
FSR
BCLKR
PCMR
VAGREF
256 kHz
512 kHz
1536 kHz
1544 kHz
2048 kHz
2560 kHz
4096 kHz
4800 kHz
MCLK
256 kHz
8 kHz
Pre-scaler
VDD
VSS
Power Conditioning
Voltage reference VAG
PUI
G.712 CODEC
PAO+
PAO-
PAI
RO-
AO
AI+
AI-
HB
Transmit
PCM
Interface
Receive
PCM
Interface
FST
BCLKT
PCMT
FSR
BCLKR
PCMR
VAGREF
W681360
Publication Release Date: January 2011
- 4 - Revision A.5
4. TABLE OF CONTENTS
1. GENERAL DESCRIPTION .................................................................................................................. 2
2. FEATURES ......................................................................................................................................... 2
3. BLOCK DIAGRAM............................................................................................................................... 3
4. TABLE OF CONTENTS ...................................................................................................................... 4
5. PIN CONFIGURATION ....................................................................................................................... 6
6. PIN DESCRIPTION ............................................................................................................................. 7
7. FUNCTIONAL DESCRIPTION ............................................................................................................ 9
7.1. Transmit Path................................................................................................................................ 9
7.1.1 Input Operational Amplifier Gain ........................................................................................... 10
7.2. Receive Path............................................................................................................................... 11
7.2.1. Receive Gain Adjust Mode................................................................................................... 12
7.3. POWER MANAGEMENT ........................................................................................................... 12
7.3.1. Analog and Digital Supply .................................................................................................... 12
7.3.2. Analog Ground Reference Bypass ...................................................................................... 12
7.3.3. Analog Ground Reference Voltage Output .......................................................................... 12
7.4. PCM INTERFACE ...................................................................................................................... 13
7.4.1. Long frame sync ................................................................................................................... 13
7.4.2. Short frame sync .................................................................................................................. 13
7.4.3. Special 16-bit Receive Modes ............................................................................................. 14
7.4.3.1. Sign-Extended Mode Timing ............................................................................................. 14
7.4.3.2. Receive Gain Adjust Mode Timing .................................................................................... 15
7.4.4. System Timing ..................................................................................................................... 15
7.5. On-Chip Power Amplifier ............................................................................................................ 15
8. TIMING DIAGRAMS .......................................................................................................................... 16
9. ABSOLUTE MAXIMUM RATINGS .................................................................................................... 21
9.1. Absolute Maximum Ratings ........................................................................................................ 21
9.2. Operating Conditions .................................................................................................................. 21
10. ELECTRICAL CHARACTERISTICS ............................................................................................... 22
10.1. General Parameters ................................................................................................................. 22
10.2. Analog Signal Level and Gain Parameters ............................................................................... 23
10.3. Analog Distortion and Noise Parameters ................................................................................. 24
W681360
Publication Release Date: January 2011
- 5 - Revision A.5
10.4. Analog Input and Output Amplifier Parameters ........................................................................ 25
10.5.1. PCM Codes for Zero and Full Scale .................................................................................. 27
10.5.2. PCM Codes for 1kHz Digital Milliwatt ................................................................................ 27
11. TYPICAL APPLICATION CIRCUIT ................................................................................................. 28
12. PACKAGE DRAWING AND DIMENSIONS .................................................................................... 29
12.1. 20L SOG (SOP)-300mil ............................................................................................................ 29
12.2. 20L SSOP-209 mil .................................................................................................................... 30
12.3. 20L TSSOP - 4.4X6.5mm ......................................................................................................... 31
12.3. QFN-32L ................................................................................................................................... 32
13. ORDERING INFORMATION ........................................................................................................... 33
14. VERSION HISTORY ....................................................................................................................... 34
W681360
Publication Release Date: January 2011
- 6 - Revision A.5
5. PIN CONFIGURATION
20
19
18
17
16
15
14
13
12
11
W681360
SINGLE
CHANNEL
CODEC
1
2
3
4
5
6
7
8
9
10
SOG, SSOP,TSSOP
VREF
RO-
PAI
PAO-
PAO+
VDD
FSR
PCMR
BCLKR
PUI
VAG
AI+
AI-
AO
HB
VSS
FST
PCMT
BCLKT
MCLK
20
19
18
17
16
15
14
13
12
11
W681360
SINGLE
CHANNEL
CODEC
1
2
3
4
5
6
7
8
9
10
SOG, SSOP,TSSOP
VREF
RO-
PAI
PAO-
PAO+
VDD
FSR
PCMR
BCLKR
PUI
VAG
AI+
AI-
AO
HB
VSS
FST
PCMT
BCLKT
MCLK
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
25
26272829303132
RO-
PAI
PAO-
PAO+
NC
VDD
FSR
PCMR
BCLKR
NC
AI-
AO
NC
HB
VSS
FST
NC
PCMT
NC
NC
PUI
MCLK
NC
NC
BCLKT
NC
NC
VREF
VAG
NC
NC
AI+
QFN-32L
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
25
26272829303132
RO-
PAI
PAO-
PAO+
NC
VDD
FSR
PCMR
BCLKR
NC
AI-
AO
NC
HB
VSS
FST
NC
PCMT
NC
AI-
AO
NC
HB
VSS
FST
NC
PCMT
NC
NC
PUI
MCLK
NC
NC
BCLKT
NC
NC
PUI
MCLK
NC
NC
BCLKT
NC
NC
VREF
VAG
NC
NC
AI+
QFN-32L
W681360
Publication Release Date: January 2011
- 7 - Revision A.5
6. PIN DESCRIPTION
Pin
Name
Pin No.
Functionality
non-
QFN
QFN
VREF
1
30
This pin is used to bypass the on–chip VDD/2 voltage reference for the VAG output pin. This pin
should be bypassed to VSS with a 0.1F ceramic capacitor using short, low inductance traces. The
VREF pin is only used for generating the reference voltage for the VAG pin. Nothing is to be
connected to this pin except the bypass capacitor.
RO-
2
1
Inverting output of the receive smoothing filter. This pin can typically drive a 2k load to 0.886VPEAK
referenced to analog ground.
PAI
3
2
Inverting input to the power amplifier. The non-inverting input is tied internally to VAG voltage.
PAO-
4
3
Inverting power amplifier output. The PAO- and PAO+ can drive a 300 load differentially to
1.772VPEAK.
PAO+
5
5
Non-inverting power amplifier output. The PAO- and PAO+ can drive a 300 load differentially to
1.772VPEAK.
VDD
6
6
Power supply. Should be decoupled to VSS with a 0.1F ceramic capacitor.
FSR
7
7
8kHz Frame Sync input for the PCM receive section. FSR can be asynchronous to FST in either
Long Frame Sync or Short Frame Sync mode.
PCMR
8
8
PCM input data receive pin. The data needs to be synchronous with the FSR and BCLKR pins.
BCLKR
9
9
PCM receive bit clock input pin. Can accept any bit clock frequency from 256 to 4800kHz. When
not clocked it can be used to select the 16 sign-bit extended synchronous mode (BCLKR=0) or the
receive gain adjust synchronous mode (BCLKR=1)
PUI
10
12
Power up input signal. When this pin is tied to VDD, the part is powered up. When tied to VSS, the
part is powered down.
MCLK
11
13
System master clock input. Possible input frequencies are 256kHz, 512kHz, 1536kHz, 1544kHz,
2048kHz, 2560kHz, 4096kHz & 4800kHz. For performance reasons, it is recommended that MCLK
be synchronous and aligned to the FST signal. This is a requirement in the case of 256 and
512kHz frequencies.
BCLKT
12
16
PCM transmit bit clock input pin. Can accept any bit clock frequency from 256 to 4800kHz.
PCMT
13
17
PCM output data transmit pin. The output data is synchronous with the FST and BCLKT pins.
FST
14
19
8kHz transmit frame sync input. This pin synchronizes the transmit data bytes.
VSS
15
20
This is the supply ground. This pin should be connected to 0V.
W681360
Publication Release Date: January 2011
- 8 - Revision A.5
Pin
Name
Pin No.
Functionality
non-
QFN
QFN
HB
16
22
High-pass Bypass. Determines if the transmit high-pass filter is used (HB=’0’) or bypassed
(HB=’1’). When the high pass is bypassed the frequency response extends to DC.
AO
17
23
Analog output of the first gain stage in the transmit path.
AI-
18
24
Inverting input of the first gain stage in the transmit path.
AI+
19
26
Non-inverting input of the first gain stage in the transmit path.
VAG
20
29
Mid-Supply analog ground pin, which supplies a VDD/2 volt reference voltage for all-analog signal
processing. This pin should be decoupled to VSS with a 0.01F capacitor. This pin becomes high
impedance when the chip is powered down.
W681360
Publication Release Date: January 2011
- 9 - Revision A.5
7. FUNCTIONAL DESCRIPTION
W681360 is a single-rail, single channel PCM CODEC for voiceband applications. The CODEC
complies with the specifications of the ITU-T G.712 recommendation. The CODEC block diagram in
Section 3 illustrates the main components of the W681360. The chip consists of a PCM interface,
which can process long and short frame sync formats. The pre-scaler of the chip provides the internal
clock signals and synchronizes the CODEC sample rate with the external frame sync frequency. The
power conditioning block provides the internal power supply for the digital and the analog section,
while the voltage reference block provides a precision analog ground voltage for the analog signal
processing.
The calibration level for both the Analog to Digital Converter (ADC) and the Digital to Analog
Converter (DAC) is referenced to μ-Law with the same bit voltage weighing about the zero crossing,
resulting in the 0dBm0 calibration level 3.2dB below the peak sinusoidal level before clipping, Based
on the reference voltage of 0.886V the calibration level is 0.436 Vrms or –5dBm at 600Ω.
FIGURE 7.1: THE W681360 SIGNAL PATH
7.1. Transmit Path
The first stage of the A-to-D path of the CODEC is an analog input operational amplifier with externally
configurable gain settings. A differential analog input may be applied to the Inputs AI+ and AI-.
Alternately the input amplifier may be powered down and a single-ended input signal can be applied to
either the AO pin or the AI- pin. The input amplifier can be powered down by connecting the AI+ pin to
13
High Pass
Bypass
13 bit linear
DAC Smoothing
Filter b
fC= 3400 Hz
Smoothing
Filter a
Buffer1
Av=1
DATA
Receive RO-
13 AI-
AO
-
+
Anti-Aliasing
Filter b
fC= 3400 Hz
Anti-Aliasing
Filter a
fC= 200 Hz
High Pass
Filter
13 bit linear
ADC
DATA
Transmit AI+
PAI
PAO+
+
-PAO-
-
+
VAG
13
High Pass
Bypass
13 bit linear
DAC Smoothing
Filter b
fC= 3400 Hz
Smoothing
Filter a
Buffer1
Av=1
DATA
Receive RO-
13 AI-AI-
AO
-
+
Anti-Aliasing
Filter b
fC= 3400 Hz
Anti-Aliasing
Filter a
fC= 200 Hz
High Pass
Filter
13 bit linear
ADC
DATA
Transmit AI+AI+
PAI
PAO+
+
-PAO-
-
+
VAG
W681360
Publication Release Date: January 2011
- 10 - Revision A.5
either VDD or VSS which also determines whether AO or AI+ is selected as input according to Table 7.1.
When the input operational amplifier is powered down the AO pin becomes high input impedance.
TABLE 7.1: INPUT AMPLIFIER MODES OF OPERATION
AI+ (Pin 19)
Input Amplifier
Input
VDD
Powered Down
AO (Pin 17)
1.2 to VDD-1.2
Powered Up
AI+, AI- (Pins 19, 18)
VSS
Powered Down
AI- (Pin 18)
When the input amplifier is powered down, the input signal at AO or AI- should be referenced to the
analog ground voltage VAG.
The output of the input operational amplifier is first fed through a low-pass filter to prevent aliasing at
the switched capacitor 3.4kHz low pass filter. Subsequently the 3.4kHz switched capacitor low pass
filter bandlimits the input signals well below 4kHz. Signals above 4kHz would be aliased at the
sampling rate of 8kHz. A high pass filter with a 200Hz cut-off frequency prevents DC coupling. All
filters are designed according to the G.712 ITU-T specification. The high-pass filter may be bypassed
depending on the logic level on the HB pin. If the high pass is removed the frequency response of the
device extends down to DC.
After filtering the signal is digitized as a 13-bit linear PCM code and fed to the PCM interface for serial
transmission at the sample rate supplied by the external frame sync FST.
7.1.1 Input Operational Amplifier Gain
The gain of the input operational amplifier can be adjusted using external resistors. For single-ended
input operation the gain is given by a simple resistive ratio.
FIGURE 7.2: INPUT OPERATIONAL AMPLIFIER GAIN – SINGLE-ENDED INPUT
For differential input operation the external resistor network is more complex but the gain is expressed
in the same way. Of course, a differential input also has an inherent 6dB advantage over a
corresponding single-ended input.
Gin = Ro/Ri
Vin
VAG
-
+
AI+
AI-
AO
Ri
Ro
W681360
Publication Release Date: January 2011
- 11 - Revision A.5
FIGURE 7.3: INPUT OPERATIONAL AMPLIFIER GAIN – DIFFERENTIAL INPUT
The gain of the operational amplifier will be typically be set to 30dB for microphone interface circuits.
However the gain may be used for more than 30dB but this will require a compact layout with minimal
trace lengths and good isolation from noise sources. It is also recommended that the layout be as
symmetrical as possible as imbalances work against the noise canceling advantages of the differential
design.
7.2. Receive Path
The 13-bit digital input samples for the D-to-A path are serially shifted in by the PCM interface and
converted to parallel data bits. During every cycle of the frame sync FSR, the parallel data bits are fed
through the 13-bit linear DAC and converted to analog samples. The analog samples are filtered by a
low-pass smoothing filter with a 3.4kHz cut-off frequency, according to the ITU-T G.712 specification.
A sin(x)/x compensation is integrated with the low pass smoothing filter. The output of this filter is
buffered to provide the receive output signal RO-. The output may be also be attenuated when the
device is in the receive path adjust mode. If the device is operated half–channel with the FST pin
clocking and FSR pin held LOW, the receive filter input will be connected to the VAG voltage. This
minimizes transients at the RO– pin when full–channel operation is resumed by clocking the FSR pin.
The RO- output can be externally connected to the PAI pin to provide a differential output with high
driving capability at the PAO+ and PAO- pins. By using external resistors various gain settings of this
output amplifier can be achieved. If the transmit power amplifier is not in use, it can be powered down
by connecting PAI to VDD. The bias voltage and signal reference of the PAO+ & PAO– outputs is the
VAG pin. The VAG pin cannot source or sink as much current as these pins, and therefore low
impedance loads must be placed between PAO+ and PAO–. The PAO+ and PAO– differential drivers
are also capable of driving a 100Ω resistive load or a 100nF piezoelectric transducer in series with a
20Ω resister with a small increase in distortion. These drivers may be used to drive resistive loads of
32Ω when the gain of PAO– is set to 1/4 or less.
AI+
AI-
Vin+
Vin-
AO
Ri
VAG
-
+
Ri
Ro
Gin = Ro/Ri
Ro
W681360
Publication Release Date: January 2011
- 12 - Revision A.5
7.2.1. Receive Gain Adjust Mode
The W681360 can be put in the receive path adjust mode by applying a logic “1” to the BCLKR pin
while all other clocks are clocked normally. The device is then in a position to read 16-bits of data,
with three additional coefficient bits an addend to the 13-bit digital voice data. These three coefficients
are used to program a receive path attenuation, thereby allowing the receive signal to be attenuated
according to the values in the following table. If the feature is not used the default value is 0dB.
Coefficient
Attenuation (dB)
000
0
001
3
010
6
011
9
100
12
101
15
110
18
111
21
TABLE 7.2: ATTENUATION COEFFICIENT RELATIONSHIP IN RECEIVE GAIN ADJUST MODE
7.3. POWER MANAGEMENT
7.3.1. Analog and Digital Supply
The power supply for the analog and digital parts of the W681360 must be 2.7V to 5.25V. This supply
voltage is connected to the VDD pin. The VDD pin needs to be decoupled to ground through a 0.1 F
ceramic capacitor.
7.3.2. Analog Ground Reference Bypass
The system has an internal precision voltage reference which generates the VDD/2 mid-supply analog
ground voltage. This voltage needs to be decoupled to VSS at the VREF pin through a 0.1 F ceramic
capacitor.
7.3.3. Analog Ground Reference Voltage Output
The analog ground reference voltage is available for external reference at the VAG pin. This voltage
needs to be decoupled to VSS through a 0.01 F ceramic capacitor. The analog ground reference
voltage is generated from the voltage on the VREF pin and is also used for the internal signal
processing.
W681360
Publication Release Date: January 2011
- 13 - Revision A.5
7.4. PCM INTERFACE
The PCM interface is controlled by pins BCLKR, FSR, BCLKT & FST. The input data is received
through the PCMR pin and the output data is transmitted through the PCMT pin.
The Long Frame Sync or Short Frame Sync interface mode can be selected by connecting the BCLKR
or BCLKT pin to a 256kHz to 4.800 MHz clock and connecting the FSR or FST pin to the 8kHz frame
sync. The device synchronizes the data word for the PCM interface and the CODEC sample rate on
the positive edge of the Frame Sync signal. Long Frame Sync is recognized when the FST pin is held
HIGH for two consecutive falling edges of the bit-clock at the BCLKT pin. Short Frame Sync Mode is
recognized when the Frame Sync signal at pin FST is HIGH for one and only one falling edge of the
bit-clock at the BCLKT pin.
7.4.1. Long frame sync
The device recognizes a Long Frame Sync when the FST pin is held HIGH for two consecutive falling
edges of the bit-clock at the BCLKT pin. The length of the Frame Sync pulse can vary from frame to
frame, as long as the positive frame sync edge occurs every 125 sec. During data transmission in the
Long Frame Sync mode, the transmit data pin PCMT will become low impedance when the Frame
Sync signal FST is HIGH or when the 13-bit data word is being transmitted. The transmit data pin
PCMT will become high impedance when the Frame Sync signal FST becomes LOW while the data is
transmitted or when half of the LSB is transmitted. The internal decision logic will determine whether
the next frame sync is a long or a short frame sync, based on the previous frame sync pulse. To avoid
bus collisions, the PCMT pin will be high impedance for two frame sync cycles after every power down
state. Long Frame Sync mode is illustrated below. More detailed timing information can be found in
the interface timing section.
Long Frame Sync (Transmit and Receive Have Individual Clocking)
FST
(FSR)
PCMT 7654321
BCLKT
(BCLKR)
12111098 13
PCMR 7654321 12111098 13don't care don't care
FIGURE 7.4: LONG FRAME SYNC PCM MODE
7.4.2. Short frame sync
The W681360 operates in the Short Frame Sync Mode when the Frame Sync signal at pin FST is
HIGH for one and only one falling edge of the bit-clock at the BCLKT pin. On the following rising edge
of the bit-clock, the W681360 starts clocking out the data on the PCMT pin, which will also change
from high to low impedance state. The data transmit pin PCMT will go back to the high impedance
state halfway through the LSB. The Short Frame Sync operation of the W681360 is based on a 13-bit
data word. When receiving data on the PCMR pin, the data is clocked in on the first falling edge after
W681360
Publication Release Date: January 2011
- 14 - Revision A.5
the falling edge that coincides with the Frame Sync signal. The internal decision logic will determine
whether the next frame sync is a long or a short frame sync, based on the previous frame sync pulse.
To avoid bus collisions, the PCMT pin will be high impedance for two frame sync cycles after every
power down state. Short Frame Sync mode is illustrated below. More detailed timing information can
be found in the interface timing section.
Short Frame Sync (Transmit and Receive Have Individual Clocking)
FST
(FSR)
PCMT 7654321
BCLKT
(BCLKR)
12111098 13
PCMR 7654321 12111098 13don't care don't care
FIGURE 7.5: SHORT FRAME SYNC PCM MODE
7.4.3. Special 16-bit Receive Modes
7.4.3.1. Sign-Extended Mode Timing
The Sign-bit extended mode is entered by applying a logic “0” to the BCLKR pin while all other clocks
are clocked normally. In standard 13-bit mode the first bit is the sign bit. In this mode the device
transmits and receives 16-bit data where the sign bit is extended to the first four data bits. The PCM
timing for this mode is illustrated below.
Sign-Extended (BCLKR=0)
Transmit and Receive both use BCLKT, and the first four data bits are the sign bit.
FST may occur at a different time than FSR
FST (FSR)
SHORT OR
LONG FRAME
SYNC
PCMT 7654321
BCLKT
(BCLKR)
12111098 13
PCMR 7654321 12111098 13don't care don't care
1514 16
1514 16 don't care
FIGURE 7.6: SIGN EXTENDED MODE
W681360
Publication Release Date: January 2011
- 15 - Revision A.5
7.4.3.2. Receive Gain Adjust Mode Timing
The Receive Path Adjust Mode is entered by applying a logic “1” to the BCLKR pin while all other
clocks are clocked normally. In this mode the device receives 16-bit data where the last three bits are
coefficients to program the Receive Gain Adjust Attenuation described above. The PCM timing for
this mode is illustrated below.
FIGURE 7.7: RECEIVE GAIN ADJUST TIMING MODE
7.4.4. System Timing
The system can work at 256kHz, 512kHz, 1536kHz, 1544kHz, 2048kHz, 2560kHz, 4096kHz &
4800kHz master clock rates. The system clock is supplied through the master clock input MCLK and
can be derived from the bit-clock if desired. An internal pre-scaler is used to generate a fixed 256kHz
and 8kHz sample clock for the internal CODEC. The pre-scaler measures the master clock frequency
versus the Frame Sync frequency and sets the division ratio accordingly. If both Frame Syncs are
LOW for the entire frame sync period while the MCLK and BCLK pin clock signals are still present, the
W681360 will enter the low power standby mode. Another way to power down is to set the PUI pin to
LOW. When the system needs to be powered up again, the PUI pin needs to be set to HIGH and the
transmit Frame Sync pulse needs to be present. It will take two transmit Frame Sync cycles before the
pin PCMT becomes low impedance.
7.5. ON-CHIP POWER AMPLIFIER
The on-chip power amplifier is typically used to drive an external loudspeaker. The inverting input to
the power amplifier is available at pin PAI. The non-inverting input is tied internally to VAG. The
inverting output PAO– is used to provide a feedback signal to the PAI pin to set the gain of the power
amplifier outputs (PAO+ and PAO-). These push–pull outputs are capable of driving a 300Ω load to
1.772 VPEAK.
Connecting PAI to VDD will power down the power driver amplifiers and the PAO+ and PAO– outputs
will be high impedance.
Receive Gain Adjust (BCLKR=1)
Transmit and Receive both use BCLKT. FST may occur at a different time than FSR.
Bits 14, 15, and 16, clocked into PCMR, are used for attenuation control for the
receive analog output.
FST (FSR)
SHORT OR
LONG FRAME
SYNC
PCMT 7654321
BCLKT
(BCLKR)
12111098
PCMR 7654321 12111098 13don't care don't care
13
1514 16 don't care
W681360
Publication Release Date: January 2011
- 16 - Revision A.5
8. TIMING DIAGRAMS
FIGURE 8.1: LONG FRAME SYNC PCM TIMING
NOTE: The Data is clocked out on the rising edge of BCLK.
The Data is clocked in on the falling edge of BCLK.
TFTRH
TFTRS TFTFH
TFDTD
TFDTD TBDTD
TBCKH TBCKL
TBCK
THID THID
TRISE TFALL
TMCK
TMCKH
TFTRHM TFTRSM
TMCKL
TFS TFSL
TFRRH
TFRRS TFRFH TBCKH TBCKL
TDRS
TDRH
MCLK
BCLKT
FST
PCMT
BCLKR
(BCLKT)
FSR
PCMR
TBCK
MSB LSB
MSB LSB
W681360
Publication Release Date: January 2011
- 17 - Revision A.5
TABLE 8.1: LONG FRAME SYNC PCM TIMING PARAMETERS
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNIT
1/TFS
FST, FSR Frequency
---
8
---
kHz
TFSL
FST / FSR Minimum LOW Width 1
TBCK
sec
1/TBCK
BCLKT, BCLKR Frequency 1
256
---
4800
kHz
TBCKH
BCLKT, BCLKR HIGH Pulse Width
50
---
---
ns
TBCKL
BCLKT, BCLKR LOW Pulse Width
50
---
---
ns
TFTRH
BCLKT Falling Edge to FST Rising
Edge Hold Time
20
---
---
ns
TFTRS
FST Rising Edge to BCLKT Falling
edge Setup Time
80
---
---
ns
TFTFH
BCLKT Falling Edge to FST Falling
Edge Hold Time
50
---
---
ns
TFDTD
The later of BCLKT rising edge, or FST
rising edge to first valid PCMT Bit Delay
Time
---
---
60
ns
TBDTD
BCLKT Rising Edge to Valid PCMT
Delay Time
---
---
60
ns
THID
Delay Time from the Later of FST
Falling Edge, or
BCLKT Falling Edge of last PCMT Bit to
PCMT Output High Impedance
10
---
60
ns
TFRRH
BCLKR Falling Edge to FSR Rising
Edge Hold Time
20
---
---
ns
TFRRS
FSR Rising Edge to BCLKR Falling
edge Setup Time
80
---
---
ns
TFRFH
BCLKR Falling Edge to FSR Falling
Edge Hold Time
50
---
---
ns
TDRS
Valid PCMR to BCLKR Falling Edge
Setup Time
1
---
---
ns
TDRH
PCMR Hold Time from BCLKR Falling
Edge
50
---
---
ns
1 TFSL must be at least TBCK
W681360
Publication Release Date: January 2011
- 18 - Revision A.5
FIGURE 8.2: SHORT FRAME SYNC PCM TIMING
TFTRH
TFTRS
TFTFH
TBDTD
TBCKH TBCKL
TBCK
THID
TRISE TFALL
TMCK
TMCKH
TFTRHM TFTRSM
TMCKL
TFS
TFRRH
TFRRS
TFRFH
TBCKH TBCKL
TDRS
TDRH
MCLK
BCLKT
FST
PCMT
BCLKR
(BCLKT)
FSR
PCMR
TBDTD
TBCK
TFTFS
TFRFS
MSB LSB
MSB LSB
W681360
Publication Release Date: January 2011
- 19 - Revision A.5
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNIT
1/TFS
FST, FSR Frequency
---
8
---
kHz
1/TBCK
BCLKT, BCLKR Frequency
256
---
4800
kHz
TBCKH
BCLKT, BCLKR HIGH Pulse Width
50
---
---
ns
TBCKL
BCLKT, BCLKR LOW Pulse Width
50
---
---
ns
TFTRH
BCLKT Falling Edge to FST Rising Edge Hold Time
20
---
---
ns
TFTRS
FST Rising Edge to BCLKT Falling edge Setup Time
80
---
---
ns
TFTFH
BCLKT Falling Edge to FST Falling Edge Hold Time
50
---
---
ns
TFTFS
FST Falling Edge to BCLKT Falling Edge Setup Time
50
---
---
ns
TBDTD
BCLKT Rising Edge to Valid PCMT Delay Time
10
---
60
ns
THID
Delay Time from BCLKT Falling Edge at last PCMT bit
(LSB) to PCMT Output High Impedance
10
---
60
ns
TFRRH
BCLKR Falling Edge to FSR Rising Edge Hold Time
20
---
---
ns
TFRRS
FSR Rising Edge to BCLKR Falling edge Setup Time
80
---
---
ns
TFRFH
BCLKR Falling Edge to FSR Falling Edge Hold Time
50
---
---
ns
TFRFS
FSR Falling Edge to BCLKR Falling Edge Setup Time
50
---
---
ns
TDRS
Valid PCMR to BCLKR Falling Edge Setup Time
1
---
---
ns
TDRH
PCMR Hold Time from BCLKR Falling Edge
50
---
---
ns
TABLE 8.2: SHORT FRAME SYNC PCM TIMING PARAMETERS
W681360
Publication Release Date: January 2011
- 20 - Revision A.5
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNIT
1/TMCK
Master Clock Frequency
---
256
512
1536
1544
2048
2560
4096
4800
---
kHz
TMCKH /
TMCK
MCLK Duty Cycle for 256kHz Operation
45%
55%
TMCKH
Minimum Pulse Width HIGH for
MCLK(512kHz or Higher)
50
---
---
ns
TMCKL
Minimum Pulse Width LOW for MCLK
(512kHz or Higher)
50
---
---
ns
TFTRHM
MCLK falling Edge to FST Rising Edge
Hold Time
50
---
---
ns
TFTRSM
FST Rising Edge to MCLK Falling edge
Setup Time
50
---
---
ns
TRISE
Rise Time for All Digital Signals
---
---
50
ns
TFALL
Fall Time for All Digital Signals
---
---
50
ns
Table 8.3: General PCM Timing Parameters
W681360
Publication Release Date: January 2011
- 21 - Revision A.5
9. ABSOLUTE MAXIMUM RATINGS
9.1. ABSOLUTE MAXIMUM RATINGS
Condition
Value
Junction temperature
1500C
Storage temperature range
-650C to +1500C
Voltage applied to any pin
(VSS - 0.3V) to (VDD + 0.3V)
Voltage applied to any pin (Input current limited to +/-20 mA)
(VSS – 1.0V) to (VDD + 1.0V)
VDD - VSS
-0.5V to +6V
1. Stresses above those listed may cause permanent damage to the device. Exposure to the absolute
maximum ratings may affect device reliability. Functional operation is not implied at these conditions.
9.2. OPERATING CONDITIONS
Condition
Value
Industrial operating temperature
-400C to +850C
Supply voltage (VDD)
+2.7V to +5.25V
Ground voltage (VSS)
0V
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely
affect the life and reliability of the device.
W681360
Publication Release Date: January 2011
- 22 - Revision A.5
10. ELECTRICAL CHARACTERISTICS
10.1. GENERAL PARAMETERS
VDD=2.7V – 3.6V; VSS=0V; TA=-40C to +85C;
Symbol
Parameters
Conditions
Min (2)
Typ
(1)
Max
(2)
Units
VIL
Input LOW Voltage
0.6
V
VIH
Input HIGH Voltage
2.2
V
VOL
PCMT Output LOW Voltage
IOL = 1.6 mA
0.4
V
VOH
PCMT Output HIGH Voltage
IOL = -1.6 mA
VDD–0.5
V
IDD
VDD Current (Operating) - ADC
+ DAC
No Load
3.25
4.7
mA
ISB
VDD Current (Standby)
FST&FSR =Vss ; PUI=VDD (3)
1
100
A
IPD
VDD Current (Power Down)
PUI= Vss (3)
0.03
10
A
IIL
Input Leakage Current
VSS<VIN<VDD
-10
+10
A
IOL
PCMT Output Leakage Current
VSS<PCMT<VDD
High Z State
-10
+10
A
CIN
Digital Input Capacitance
10
pF
COUT
PCMT Output Capacitance
PCMT High Z
15
pF
1. Typical values: TA = 25°C , VDD = 3.0 V
2. All min/max limits are guaranteed by Nuvoton via electrical testing or characterization. Not all
specifications are 100 percent tested.
3. No DC load from VREF & VAG to Vss
W681360
Publication Release Date: January 2011
- 23 - Revision A.5
10.2. ANALOG SIGNAL LEVEL AND GAIN PARAMETERS
VDD=2.7V to 3.6V; VSS=0V; TA=-40C to +85C; all analog signals referred to VAG; 0dBm0 = 0.436
Vrms = -5dBm @ 600 Ohm; FST =FSR = 8kHz;MCLK=BCLK= 2.048 MHz
PARAMETER
SYM.
CONDITION
TYP.
TRANSMIT
(A/D)
RECEIVE
(D/A)
UNIT
MIN.
MAX.
MIN.
MAX.
Absolute Level
LABS
0 dBm0 = -5dBm @ 600
0.616
0.436
---
---
---
---
VPK
VRMS
Max. Transmit
Level
TXMAX
3.2
0.886
---
---
---
---
dBm0
VPK
Absolute Gain (0
dBm0 @ 1020Hz;
TA=+25C)
GABS
0 dBm0 @ 1020Hz;
TA=+25C
0
-0.20
+0.20
-0.20
+0.20
dB
Absolute Gain
variation with
Temperature
GABST
TA=0C to TA=+70C
TA=-40C to TA=+85C
0
-0.05
-0.10
+0.05
+0.10
-0.05
-0.10
+0.05
+0.10
dB
Frequency
Response,
Relative to 0dBm0
@ 1020Hz
(HB=0)
GRTV
15Hz
50Hz
60Hz
200Hz
300 to 1600Hz
1600 to 2400Hz
2400 to 3000Hz
3300Hz
3400Hz
3600Hz
4000Hz
4600Hz to 100kHz
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
-1.4
-0.2
-0.2
-0.2
-0.2
-0.7
---
---
---
-45
-30
-26
-0.4
+0.2
+0.2
+0.2
+0.2
+0.15
0
-12.5
-32
-0.5
-0.5
-0.5
-0.5
-0.2
-0.2
-0.25
-0.4
-0.8
---
---
---
0
0
0
0
+0.2
+0.25
+0.2
+0.15
0
0
-12.5
-30
dB
W681360
Publication Release Date: January 2011
- 24 - Revision A.5
10.3. ANALOG DISTORTION AND NOISE PARAMETERS
VDD=2.7V to 3.6V; VSS=0V; TA=-40C to +85C; all analog signals referred to VAG; 0dBm0 = 0.436
Vrms = -5dBm @ 600 Ohm; FST =FSR = 8kHz;MCLK=BCLK= 2.048 MHz
PARAMETER
SYM.
CONDITION
TRANSMIT (A/D)
RECEIVE (D/A)
UNIT
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
Total Distortion
vs. Level Tone
(1020Hz, C-
Message
Weighted)
DLT
+3 dBm0
0 dBm0
-10 dBm0
-20 dBm0
-30 dBm0
-40 dBm0
-50 dBm0
-60 dBm0
45
50
51
50
41
32
22
12
55
60
60
54
44
34
24
14
---
---
---
---
---
---
---
---
50
48
45
48
45
35
25
14
60
63
60
55
47
37
27
17
---
---
---
---
---
---
---
---
dBC
Spurious Out-Of-
Band at RO-
(300Hz to 3400Hz
@ 0dBm0)
DSPO
4600Hz to 7600Hz
7600Hz to 8400Hz
8400Hz to 100000Hz
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
-30
-40
-30
dB
Crosstalk
(1020Hz @
0dBm0)
DXT
---
---
-75
---
---
-75
dB
Absolute Group
Delay
ABS
1200Hz (HB=0)
---
---
360
---
---
240
sec
Group Delay
Distortion (relative
to group delay @
1200Hz)
D
500Hz
600Hz
1000Hz
2600Hz
2800Hz
---
---
---
---
---
---
---
---
---
---
750
380
130
130
750
---
---
---
---
---
---
---
---
---
---
750
370
120
120
750
sec
Idle Channel
Noise
NIDL
C-message weighted
Psophometric weighted
---
---
---
---
18
-72
---
---
---
---
16
-74
dBrnc0
dBm0p
W681360
Publication Release Date: January 2011
- 25 - Revision A.5
10.4. ANALOG INPUT AND OUTPUT AMPLIFIER PARAMETERS
VDD=2.7V to 3.6V; VSS=0V; TA=-40C to +85C; all analog signals referred to VAG;
PARAMETER
SYM.
CONDITION
MIN.
TYP.
MAX.
UNIT.
AI Input Offset Voltage
VOFF,AI
AI+, AI-
---
---
25
mV
AI Input Current
IIN,AI
AI+, AI-
---
0.1
1.0
A
AI Input Resistance
RIN,AI
AI+, AI- to VAG
10
---
---
M
AI Input Capacitance
CIN,AI
AI+, AI-
---
---
10
pF
AI Common Mode Input Voltage
Range
VCM,AI
AI+, AI-
1.2
---
VDD-1.2
V
AI Common Mode Rejection Ratio
CMRRTI
AI+, AI-
---
60
---
dB
AI Amp Gain Bandwidth Product
GBWTI
AO, RLD10k
---
2500
---
kHz
AI Amp DC Open Loop Gain
GTI
AO, RLD10k
---
95
---
dB
AI Amp Equivalent Input Noise
NTI
C-Message Weighted
---
-24
---
dBrnC
AO Output Voltage Range
VTG
RLD=2k to VAG
0.4
---
VDD-0.4
V
Load Resistance
RLDTGRO
AO, RO to VAG
2
---
---
k
Load Capacitance
CLDTGAO
AO
---
---
100
pF
Load Capacitance
CLDTGRO
RO
---
---
200
pF
AO & RO Output Current
IOUT1
0.5 AO,RO- VDD-0.5
1.0
---
---
mA
RO- Output Resistance
RRO-
RO-, 0 to 3400Hz
---
1
---
RO- Output Offset Voltage
VOFF,RO-
RO- to VAG
---
---
25
mV
Analog Ground Voltage
VAG
Relative to VSS (no
load)
VDD/2-0.1
VDD/2
VDD/2+0.1
V
W681360
Publication Release Date: January 2011
- 26 - Revision A.5
PARAMETER
SYM.
CONDITION
MIN.
TYP.
MAX.
UNIT.
VAG Output Resistance
RVAG
Within 25mV change
---
12.5
25
Power Supply Rejection Ratio (0 to
100kHz to VDD, C-message. All
signals referenced to VAG)
PSRR
Transmit
Receive
40
40
60
60
---
---
dBC
PAI Input Offset Voltage
VOFF,PAI
PAI
---
---
25
mV
PAI Input Current
IIN,PAI
PAI
---
0.05
1.0
A
PAI Input Resistance
RIN,PAI
PAI to VAG
10
---
---
M
PAI Amp Gain Bandwidth Product
GBWPI
PAO- no load
(@10kHz)
---
1000
---
kHz
Output Offset Voltage
VOFF,PO
PAO+ to PAO-
---
---
50
mV
Load Capacitance
CLDPO
PAO+, PAO-
differentially or PAO+,
PAO to VAG
---
---
1000
pF
PAO Output Current
IOUTPAO
0.4 PAO+,PAO--
VDD-0.4
10.0
---
---
mA
PAO Output Resistance
RPAO
PAO+ to PAO-
---
1
---
PAO Differential Gain
GPAO
RLD=300, +3dBm0,
1kHz, PAO+ to PAO-
-0.2
0
+0.2
dB
PAO Differential Signal to Distortion
C-Message weighted
DPAO
ZLD=300
ZLD=100nF + 20
ZLD=100 (10mA
limit)
45
---
---
60
40
40
---
---
---
dBC
PAO Power Supply Rejection Ratio
(0 to 25kHz to VDD, Differential out)
PSRRPA
O
0 to 4kHz
4 to 25kHz
40
---
55
40
---
---
dB
W681360
Publication Release Date: January 2011
- 27 - Revision A.5
10.5. Digital I/O
10.5.1. PCM Codes for Zero and Full Scale
Level
Sign bit
Magnitude Bits
+ Full Scale
0
1111 1111 1111
+ One Step
0
0000 0000 0001
Zero
0
0000 0000 0000
- One Step
1
1111 1111 1111
- Full Scale
1
0000 0000 0000
10.5.2. PCM Codes for 1kHz Digital Milliwatt
Phase
Sign bit
Magnitude Bits
/ 8
0
0100 0011 1100
3 / 8
0
1010 0011 1001
5 / 8
0
1010 0011 1001
7 / 8
0
0100 0011 1100
9 / 8
1
1011 1100 0100
11 / 8
1
0101 1100 0111
13 / 8
1
0101 1100 0111
15 / 8
1
1011 1100 0100
W681360
Publication Release Date: January 2011
- 28 - Revision A.5
11. TYPICAL APPLICATION CIRCUIT
1.0 uF
1.0 uF
100pF
POWER CONTROL
0.1 uF
8 KHz Frame Sync
22 uF
PCM IN
VDD
3.9K+
62K
2.048 MHz
Bit Clock
1.5K
100pF
27K
MICROPHONE
0.1 uF
27K
3.9K
1K
ELECTRET
27K
0.01 uF
62K
1.5K
U2
W681360
615
10
16
14
12
13
11
8
9
7
17
18
19
20
1
2
5
3
4
VDDVSS
PUI
HB
FST
BCLKT
PCMT
MCLK
PCMR
BCLKR
FSR
AO
AI-
AI+
VAG
VREF
RO-
PAO+
PAI
PAO-
SPEAKER
PCM OUT
HP FILTER SELECT
FIGURE 11.1: TYPICAL HANDSET INTERFACE
W681360
Publication Release Date: January 2011
- 29 - Revision A.5
12. PACKAGE DRAWING AND DIMENSIONS
12.1. 20L SOG (SOP)-300MIL
SMALL OUTLINE PACKAGE (SAME AS SOG & SOIC) DIMENSIONS
SYMBOL
DIMENSION (MM)
DIMENSION (INCH)
MIN.
MAX.
MIN.
MAX.
A
2.35
2.65
0.093
0.104
A1
0.10
0.30
0.004
0.012
b
0.33
0.51
0.013
0.020
c
0.23
0.32
0.009
0.013
E
7.40
7.60
0.291
0.299
D
12.60
13.00
0.496
0.512
e
1.27 BSC
0.050 BSC
HE
10.00
10.65
0.394
0.419
Y
-
0.10
-
0.004
L
0.40
1.27
0.016
0.050
0
0º
8º
0º
8º
E
1
20
11
10
W681360
Publication Release Date: January 2011
- 30 - Revision A.5
12.2. 20L SSOP-209 MIL
SHRINK SMALL OUTLINE PACKAGE DIMENSIONS
SYMBOL
DIMENSION (MM)
DIMENSION (INCH)
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
A
-
-
2.00
-
-
0.079
A1
0.05
-
-
0.002
-
-
A2
1.65
1.75
1.85
0.065
0.069
-
b
0.22
-
0.38
0.009
-
0.015
c
0.09
-
0.25
0.004
-
0.010
D
6.90
7.20
7.50
0.272
0.283
0.295
E
5.00
5.30
5.60
0.197
0.209
0.220
HE
7.40
7.80
8.20
0.291
0.307
0.323
e
-
0.65
-
-
0.0256
-
L
0.55
0.75
0.95
0.021
0.030
0.037
L1
-
1.25
-
-
0.050
-
Y
-
-
0.10
-
-
0.004
0
0º
-
8º
0
-
8º
1
2
0
D
E
e
Y
b
A
1
A
2
A
SEATING
PLANE
DTEAIL
A
L
L
1
DETAIL
A
SEATING
PLANE
E
H
1
0
1
1
b
W681360
Publication Release Date: January 2011
- 31 - Revision A.5
12.3. 20L TSSOP - 4.4X6.5MM
PLASTIC THIN SHRINK SMALL OUTLINE PACKAGE (TSSOP) DIMENSIONS
W681360
Publication Release Date: January 2011
- 32 - Revision A.5
12.3. QFN-32L
QUAD FLAT PACK NO LEADS PACKAGE (QFN) DIMENSIONS
L
W681360
Publication Release Date: January 2011
- 33 - Revision A.5
13. ORDERING INFORMATION
Nuvoton Part Number Description
When ordering W681360 series devices, please refer to the following part numbers.
Part Number
W681360SG
W681360RG
W681360WG
W681360YG
Package Type:
S = 20-Lead Plastic Small Outline Package (SOG/SOP)
R = 20-Lead Plastic Shrink Small Outline Package (SSOP)
W = 20-Lead Plastic Thin Shrink Small Outline Package (TSSOP)
Y = 32-Quad Flat No leads Package (QFN)
Product Family
W681360
W681360_ _
Package Material:
G = Pb-free (RoHS) Package
W681360
Publication Release Date: January 2011
- 34 - Revision A.5
14. VERSION HISTORY
VERSION
DATE
PAGE
DESCRIPTION
A.1
April 2004
All
Preliminary Specification
A.15
April 2005
32
Add Important Note
A.16
September,
2005
2
6, 7
9
10, 12
22
27
31
32
Added reference to Pb-free RoHS packaging and to VRMS
Added reference to QFN-32L package
Added QFN-32L Pinout
Added Pin numbers to Tables
Capitalized logic HIGH/LOW
Added Reference to VRMS
Improved Application Diagram
Added QFN-32L Mechanical Dimensions
Added Y and G package ordering code
A.3
January
2009
24
Idle Channel Noise (C-message weighted) receive maximum
parameter updated
A.4
January
2009
33
Leaded packages no longer supported
A.5
January
2011
31
Improved TSSOP package diagram
Important Notice
Nuvoton products are not designed, intended, authorized or warranted for use as components
in systems or equipment intended for surgical implantation, atomic energy control instruments,
airplane or spaceship instruments, transportation instruments, traffic signal instruments,
combustion control instruments, or for other applications intended to support or sustain life.
Further more, Nuvoton products are not intended for applications wherein failure of Nuvoton
products could result or lead to a situation wherein personal injury, death or severe property
or environmental damage could occur.
Nuvoton customers using or selling these products for use in such applications do so at their
own risk and agree to fully indemnify Nuvoton for any damages resulting from such improper
use or sales.
The information contained in this datasheet may be subject to change without
notice. It is the responsibility of the customer to check the Nuvoton website
(www.nuvoton.com) periodically for the latest version of this document, and any
Errata Sheets that may be generated between datasheet revisions.
