MC145444P - Motorola / Freescale Semiconductor

MC145444MOTOROLA 1

Advance Information

  

MC145444 is a silicon gate CMOS frequency shift keying (FSK) modem

intended for use with telemeter systems or remote control systems over the

telephone network.

This device is compatible with CCITT V.21 and contains the entire circuit that

provides a full–duplex or half–duplex 300–baud data communication over a pair

of telephone lines. This device also includes the DTMF generator and call

progress tone detector (CPTD).

The differential line driver has the capability of driving 0 dBm into a 600 Ω load

with a single +5 V power supply.

The transmit level is controlled by the programmable attenuator in 1 dB steps.

Devices functions are controlled through a 3–wire serial interface.

•Capable of Driving 0 dBm into a 600 Ω Load

•DTMF Generator On–Chip

•Imprecise Call Progress Detector On–Chip

•A T ransmit Attenuator Programmable in 1 dB Steps

•3–Wire Serial Interface

•Compatible with CCITT V.21

•2100 Hz Answer Tone Generator On–Chip

•Analog Loopback Configuration for Self Test

•Simplex, Half–Duplex, and Full–Duplex Operation

This document contains information on a new product. Specifications and information herein are subject to change without notice.

Order this document

by MC145444/D



SEMICONDUCTOR TECHNICAL DATA



H SUFFIX

PLASTIC DIP

CASE 804

DW SUFFIX

SOG PACKAGE

CASE 751D

TLA

CDA

GNDA

FTLC

RxBO

RxD

GND 5

DSI

TxA2

TxA1

RxA

RxGC

TxD

DATA

SCK

ENB

VCC

PIN ASSIGNMENT

ORDERING INFORMATION

MC145444P Plastic DIP

MC145444DW SOG Package

 Motorola, Inc. 1995

REV 0

8/95

MC145444 MOTOROLA

MUX

15–BIT

LATCH

ANALOG GROUND

GENERATOR

BLOCK DIAGRAM

– 1

FSK

DEMODULATOR

SMOOTHING

FILTER

MUX

CARRIER/CPT

DETECTOR

FSK

MODULATOR

DTMF

GENERATOR

LEVEL

CONTROL

LOGIC

15–BIT

SHIFT REGISTER

POWER–ON

RESET

CLOCK

GENERATOR

ANTI–ALIAS

FILTER LOW–BAND

BPF

HIGH–BAND

BPF MUX/

MIXING

AC AMP

MUX

S/H

FTLC

X1 X2 GND VCC

GNDA

RxBO

RxA

RxGC

TxD

TLA

ENB

DATA

SCK

RxD

CDA

DSI

TxA1

TxA2

–65 k

20 k

30 k

MAXIMUM RATINGS* (V oltages Referenced to VSS)

Rating Symbol Value Unit

DC Supply Voltage VCC – 0.5 to + 7.0 V

DC Input Voltage Vin – 0.5 to VCC + 0.5 V

DC Output Voltage Vout – 0.5 to VCC + 0.5 V

Clamp Diode Current per Pin IIK, IOK ± 20 mA

DC Current per Pin Iout ± 25 mA

Power Dissipation PD500 mW

Storage Temperature Range Tstg – 65 to + 150 °C

RECOMMENDED OPERATING CONDITIONS

Parameter Symbol Min Typ Max Unit

DC Supply Voltage VCC 4.5 5 5.5 V

DC Input Voltage Vin 0 — VCC V

DC Output Voltage Vout 0 — VCC V

Input Rise T ime tr0 — 500 ns

Input Fall T ime tf0 — 500 ns

Crystal Frequency fosc —3.579545 — MHz

Operating Temperature Range TA– 20 25 70 °C

MC145444MOTOROLA 3

DC ELECTRICAL CHARACTERISTICS (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Input Voltage H Level VIH 3.15 — — V

L Level VIL — — 1.1

Output Voltage H Level V OH IOH = 20 µA VCC – 0.1 VCC – 0.01 — V

L Level VOL IOL = 20 µA

IOL = 2 mA —

—0.01

—0.1

0.4

Input Current DATA, SCK, E, TxD Iin Vin = VCC or GND — ± 1.0 ± 10.0 µA

Quiescent Supply Current ICC FSK Mode — 8 — mA

Power

–

Down Supply Current

ICC Power–Down Mode 1 — — 300 µA

Power

–

Down

Supply

Current

ICC Power–Down Mode 2 — — 1 µA

TRANSMIT CARRIER CHARACTERISTICS (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Carrier Frequency Channel 1 Mark ‘‘1’’ f1M

ClF

974 980 986 Hz

Space ‘‘0’’ f1S

Crystal Frequency

1174 1180 1186

Carrier Frequency Channel 2 Mark ‘‘1’’ f2M Crystal Frequency

3.579545 MHz 1644 1650 1656

Space ‘‘0’’ f2S

579545

MHz

1844 1850 1856

Answer Tone fans 2094 2100 2106

T ransmit Carrier Level VO*

Attenuator 0 dB

— 6 — dBm

Second Harmonic Energy V2h*Attenuator = 0 dB

RTLA = ∞—– 46 — dBm

Out–of–Band Energy VOE*

RTLA

∞

Figure 1 dBm

*VTXA1 – VTXA2, RL = 1.2 kΩ

TRANSMIT ATTENUATOR CHARACTERISTICS (VCC = + 5.0 V ±10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Attenuator Range ARNG 0 — 15 dB

Attenuator Accuracy AACC – 0.5 — + 0.5 dB

RECEIVER CHARACTERISTICS (Includes Hybrid, Demodulator and Carrier Detector)

(VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Input Impedance RIRX RxA Pin (Pin 19) 50 — — kΩ

Receiver Carrier Amplitude VIRX – 48 — – 12 dBm

Carrier Detect OFF to ON VCDON CDA = 1.2 V

fi1 0 kHz

—– 44 — dBm

Threshold ON to OFF VCDOF fin = 1.0 kHz —– 47 —

Hysterisis (VCDON – VCCDOF) HVS 2 — — dB

Carrier Detect T iming OFF to ON

CD1 = 0, CD0 = 0 — 450 — ms

TCDON

CD1 = 0, CD0 = 1 — 15 —

CDON CD1 = 0, CD1 = 1 — 15 —

CD1 = 1, CD0 = 1 — 80 —

ON to OFF

CD1 = 0, CD0 = 0 — 30 —

TCDOFF

CD1 = 0, CD0 = 1 — 30 —

CDOFF CD1 = 0, CD0 = 1 — 15 —

CD1 = 1, CD0 = 1 — 10 —

MC145444 MOTOROLA

BAND–PASS FILTER CHARACTERISTICS (RxA to FTLC) (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

FTLC Output Impedance ROFT 10 — 50 kΩ

Adjacent Channel Rejection REJ VRXA = – 12 dBm — 50 — dB

Pass–Band Gain GPAS —10 — dB

Group Delay Low–Band Filter

930 – 1230 Hz — 700 — µs

High–Band Filter

1600 – 1900 Hz — 800 —

DTMF CHARACTERISTICS (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Tone Output Level Low Group Vfl* — 3 — dBm

High Group Vfh*— 4 —

High Group Pre Emphasis PEAttenuator = 0 dB

RTLA ∞

0 — 3 dB

DTMF Distortion DIST RTLA = ∞

Crystal Frequency — 5 — %

DTMF Frequency Variation ∆fV

Crystal

Frequency

3.579545 MHz – 1 — 1 %

Out–of–Band Energy VOE*Figure 1 dB

Setup T ime tosc — 4 — ms

*VTXA1 – VTXA2, RL = 1.2 kΩ

CPTD CHARACTERISTICS (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Band–Pass Filter Center Frequency fc— 400 — Hz

Band–Pass Filter – 3 dB Band Width ∆BW —140 — Hz

Tone Detect Level OFF to ON VTDON

CDA 1 2 V

—– 44 — dBm

ON to OFF VTDOF CDA = 1.2 V —– 47 —

Tone Detect Timing OFF to ON TTDON fin = 400 Hz —10 — ms

ON to OFF TTDOF —25 —

DEMODULATOR CHARACTERISTICS (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Bit Bias ID Input Level = – 24 dBm — 5 — %

Bit Error Rate BER Input Level = – 24 dBm

CCITT Line Simulation

511 Bit Pattern

S/N = 5 dB

— 0.00001 — —

SWITCHING CHARACTERISTICS (VCC = + 5.0 V ± 10%, TA = – 20 to + 70°C)

Characteristic Symbol Conditions Min Typ Max Unit

Setup Times DATA to SCK tsu 50 — — ns

SCK to ENB 50 — — ns

Hold Time SCK to DATA th50 — — ns

Recovery T ime ENB to SCK trec 50 — — ns

Input Rise T ime tr— — 2 µs

Input Fall T ime tf— — 2 µs

Input Pulse Width ENB, SCK tw50 — — ns

MC145444MOTOROLA 5

Figure 1. Out–of–Band Energy Figure 2. Switching Characteristics

– 55

– 15 dB/OCT.

f (Hz)

256 k16 k4 k3.4 k0

– 25

50%

DATA

SCK

ENB

50%

DAT A LATCHED

LAST

CLK FIRST

CLK

tsu th

trtf

tsu trec

— VCC

— GND

— VCC

— GND

— VCC

— GND

— VCC

— GND

PIN DESCRIPTION

VCC

Positive Power Supply (Pin 15)

This pin is normally tied to the + 5.0 V. A 0.1 µF decoupling

capacitor should be used.

GND

Ground Pin (Pin 5)

This pin is normally tied to 0 V.

GNDA

Analog Ground (Pin 3)

Analog ground is internally biased to (VCC – VSS) / 2. It

should be tied to ground through a 0.1 µF and 100 µF

capacitor.

Crystal Oscillator Output (Pin 7)

Connecting a 3.579545 MHz ±0.1% crystal between X1

and X2 will cause the transmit frequencies to be within

±64 MHz of nominal. X1 is capable of driving several CMOS

gates. An external clock may be applied to X2. X1 should

then be left open.

Crystal Oscillator Input (Pin 8)

Refer to X1.

SCK

Shift Resister Clock Input (Pin 13)

This pin is the clock input for the 15–bit shift register . Serial

data is loaded into the shift register on the rising edge of this

clock.

DATA

Serial Data Input (Pin 12)

This pin is the 15–bit serial data input. This data deter-

mines the mode, DTMF signal, transmit attenuation, carrier

detect time, channel, and transmit squelch.

ENB

Enable Input (Pin 14)

Data is loaded into the 15–bit shift register when this pin is

at a logic low. When this pin transitions from a logic high to

low, the data is transferred to the internal latch on the falling

edge of ENB. New data loaded into the shift register will not

affect the device operation until this pin transitions from high

to low. (See Figure 2.)

TxD

Transmit Data Input (Pin 11)

This pin is the transmit data input, The mark frequency is

generated when this pin is at the logic high level. The space

frequency is generated when the pin is at a logic low.

RxD

Receive Data Output (Pin 10)

This pin is the receive data output. A high logic level of this

pin indicates that the mark carrier frequency has been re-

ceived, and a low logic level indicates the space carrier fre-

quency has been received.

Carrier/Call Progress Tone Detect (Pin 9)

This pin is the output from the carrier detector or call prog-

ress tone detector. This pin works as a carrier detector in the

FSK mode and as the call progress tone detector in the

CPTD mode. The output goes to a logic low level when the

input signal reaches the minimum threshold of the detect

level that is adjusted by the CDA voltage. When SD = H, the

receive data output (RxD) is clamped high to avoid errors

that may occur with loop noise. The SD pin is also clamped

high in the other modes except during the power–down

mode.

TxA1

Non–Inverting Transmit Analog Carrier Output (Pin 18)

This pin is the line driver non–inverting output of the FSK

and tone transmit analog signals. A + 6 dBm (max) dif feren -

tial output voltage can be obtained by connecting a 1.2 kΩ

load resistor between Tx1 and Tx2. Attention must be set so

as not to exceed this level when an ex ternal input is added

to the DSI pin. A telephone line (600 Ω) is driven through an

external 600 Ω resistor. In this case, the output level be-

comes about half of differential output.

MC145444 MOTOROLA

TxA2

Inverting Transmit Analog Carrier Output (Pin 17)

This pin is the line driver inverting output. The signal is

equal in magnitude, but 180° out of phase with the TxA1

(refer to TxA1).

RxA

Receive Signal Input (Pin 19)

This pin is the receive signal input. The pin has an input

impedance of 50 kΩ (min).

RxGC

Receive Gain Adjust (Pin 20)

This pin is used to adjust the receive buffer gain. To adjust

the gain, the signal from the RxBO through a divider is added

as a feedback. This pin may be held open when the gain

adjustment is not needed.

RxBO

Receiver Buffer Output (Pin 1)

This pin is the receive buffer output.

DSI

Driver Summing Input (Pin 16)

This pin is the inverting input of the line driver. An external

signal is transmitted through an external series resistor RDSI.

The differential gain GDSI = (VTXA1 – VTXA2)/VDSI is deter-

mined by the following equation.

GDSI = – 2Rf / RDSI, Rf ≈ 20 kΩ

DSI should be left open when not used.

CDA

Carrier Detect Level/CPTD Level Control (Pin 4)

The carrier/call progress tone detect level is programmed

with a CDA pin voltage.

When this pin is held open, the CDA voltage is set to

1.2 V with an internal divider. The detect level is set at

– 44 dBm (typ) for off to on, and – 47 dBm (typ) for on to off.

The minimum hysteresis is 2 dB. This pin has a very high

input impedance so it should be connected to GND with a

0.1 µF capacitor to keep it well regulated. An external voltage

may be applied to this pin to adjust the carrier detect

threshold. The following equations may be used to find the

CDA voltage required for a given threshold voltage.

VCDA = 245 × Von

VCDA = 347 × Voff

FTLC

Filter Test (Pin 2)

This pin is a high–impedance filter output. It may be used

to check the receive filter. This pin also may be used as a

demodulator input. In normal operation, this pin is connected

to the GNDA through a 0.1 µF bypass capacitor. This pin

handles very small signals so care must be used with the

capacitor’s wiring.

TLA

Transmit Carrier Level Adjust (Pin 6)

This pin is used to adjust the transmit carrier level that is

determined by the value of the resistor (RTLA) connected

between this pin and GND. The maximum transmit level is

obtained when this pin is connected to GND (RTLA = 0).

SERIAL INTERFACE

The following six functions are set up with the 15–bit serial

data.

T3 T2 T1 T0

CD1 CD0

A2 A1 A0

TONE FREQUENCY :

CARRIER DETECT TIME :

CHANNEL :

SQTRANSMIT SQUELCH :

FUNCTION MODE :

TRANSMIT ATTENUATOR :

M2 M1 M0

Figure 3 presents the 15–bit serial data timing, starting

with the carrier detect time, CD1, followed by the channel,

the tone frequency, the transmit squelch, the transmit attenu-

ator , and the function mode. This data is loaded into the inter-

nal shift register at the rising edge of the SCK signal and

latched at the falling edge of the ENB signal.

FUNCTION MODE

Modes are selected from the following 3–bit data (M2 –

M0, see Table 1).

Table 1. Function Mode Truth Table

M2 M1 M0 Function Mode

0 0 0 FSK

001Analog Loopback

0 1 0 CPTD

011Answer Tone

1 0 0 DTMF

101Single Tone

110Power–Down 1

1 1 1 Power–Down 2

The following paragraphs describe each function. Table 2

presents each output status.

FSK Mode

The transmitter and the receiver work as a FSK modula-

tor/demodulator. The SD pin output is the carrier’s detect

signal.

Analog Loopback Mode

TxA1 connects to the receiver internally and FSK signals

are demodulated. The frequency of the receiver is set up with

the same frequency as the transmitter. The SD pin output is

the carrier detect signal. An IC self test is supported with this

function.

CPTD Mode

The receiver detects a 400 Hz call progress tone. The

detect signal comes from the SD pin. The transmitter is

disabled.

MC145444MOTOROLA 7

DATA

SCK

M0CD1 CD0 CH T3 T2 T1 T0 SQ A3 A2 A1 A0 M2 M1

Figure 3. Serial Data Timing

Table 2. Output Status

FiMd

Output

Function Mode RxD SD TxA1, TxA2

FSK Received

Digital Data

Carrier

Detect

FSK

Analog Loopback Digital Data Detect

CPTD H CPTD VCC/2

Answer Tone H H Answer Tone

DTMF H H DTMF Tone

Single Tone H H Single Tone

Power–Down 1, 2 High–Z High–Z High–Z

Answer Tone Mode

The transmitter works as 2100 Hz answer tone generator.

The receiver is disabled.

DTMF Mode

The transmitter works as a DTMF tone generator. The

receiver is disabled.

Single Tone Mode

The transmitter output is one of the DTMF eight frequen-

cies. The receiver is disabled.

Power–Down Mode 1

Internal circuits except the oscillator are disabled, and all

outputs except the X1 pin go to the high impedance state.

The supply current decreases to 300 µA (max).

Power–Down Mode 2

All circuits including the oscillator stop working and all out-

puts go to the high impedance state. The supply current de-

creases to 1.0 µA (max).

Transmit Attenuator

Four–bit serial data (A3 – A0) sets up the analog transmit

level in the FSK, answer tone, DTMF, analog loopback, and

single tone mode. The range of the transmit attenuator is 0 –

15 dB in 1 dB steps. The external signal (DSI) is not affected

by this attenuator.

TONE FREQUENCY

The DTMF tones or the single tone mode is selected by

the 4–bit serial data (T3 – T0).

MC145444 MOTOROLA

Table 3. Transmit Attenuator Truth Table

A3 A2 A1 A0 Attenuation (dB)

0 0 0 0 0

0 0 0 1 1

0 0 1 0 2

0 0 1 1 3

0 1 0 0 4

0 1 0 1 5

0 1 1 0 6

0 1 1 1 7

1 0 0 0 8

1 0 0 1 9

1 0 1 0 10

1 0 1 1 11

1 1 0 0 12

1 1 0 1 13

1 1 1 0 14

1 1 1 1 15

Table 4. Tone Frequency Truth Table

Tone Frequency (Hz)

DTMF Mode

Si l

T3 T2 T1 T0 Low Group High Group Keyboard

Equivalent Single

Tone Mode

0 0 0 0 941 1633 D 941

0 0 0 1 697 1209 1 697

0 0 1 0 697 1336 2 697

0 0 1 1 697 1477 3 697

0 1 0 0 770 1209 4 770

0 1 0 1 770 1336 5 770

0 1 1 0 770 1477 6 770

0 1 1 1 852 1209 7 852

1 0 0 0 852 1336 8 1336

1 0 0 1 852 1477 9 1477

1 0 1 0 941 1336 0 1336

1 0 1 1 941 1209 * 1209

1 1 0 0 941 1477 # 1477

1 1 0 1 697 1633 A 1633

1 1 1 0 770 1633 B 1633

1 1 1 1 852 1633 C 1633

MC145444MOTOROLA 9

TRANSMIT SQUELCH

The 1–bit serial data (SQ) controls the transmit analog sig-

nal. The FSK signal, DTMF tones, single tone, and answer

tone are disabled. The external signal to the DSI will be

transmitted at that time. The internal line driver works at all

times except during the power–down mode.

SQ Squelch

1 Enable

0 Disable

CHANNEL

The transmit and receive channel is set up with a 1–bit se-

rial data (CH) when the function mode is either in FSK or

analog loopback.

When the function mode is either on the FSK or analog

loopback mode, the transmit and receive channel is set up

with a 1–bit serial data (CH).

CH Channel

11 (Originate)

02 (Answer)

CARRIER DETECT TIME

The carrier detect time (see Figure 4 and Table 5) is set by

2–bit serial data (CD1, CD0). ton indicates the amount of time

the carrier is greater than Von threshold must be present be-

fore SD goes low.

toff, on the other hand, indicates the amount of delay time

SD goes high after the carrier level becomes lower than V off

threshold.

Von Voff

RxA

toff

ton

Figure 4. Carrier Detect Timing

Table 5. Carrier Detect Time Truth Table

CD1

CD0

Carrier Detect Time (Typ)

CD1 CD0 ton (ms) toff (ms)

0 0 450 30

0 1 15 30

1 0 15 15

1 1 80 10

POWER–ON RESET

When the power is switched on, this device has the follow-

ing conditions.

Function Mode FSK

T ransmit Attenuator 0 dB

T ransmit Squelch Enable

Channel 1 (Originate)

MC145444 MOTOROLA

100

F 0.1

FGNDA

FTLC

CDA

0.1

TLA

DSI

3.57945 MHz

TxA2

TxA1

RxA

RxGC

RxBO

TxD

RxD

DATA

SCK

ENB

0.1

VCC +5 V

600 : 600

10 Ω

600 Ω

TIP

RING

GND

MCU

I/O PORT

LINE PROTECTION CIRCUIT ANALOG GROUNDDIGITAL GROUND

Figure 5. Application Circuit

MC145444MOTOROLA 11

PACKAGE DIMENSIONS

H SUFFIX

PLASTIC DIP

CASE 804–01

0.030 NOM 0.76 NOM

HGF

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. DIMENSION B DOES NOT INCLUDE MOLD

FLASH.

3. DIMENSION L TO CENTER OF LEADS WHEN

FORMED PARALLEL.

4. CONTROLLING DIMENSION: INCH.

DIM

AMIN MAX MIN MAX

MILLIMETERS

0.930 0.970 23.63 24.63

INCHES

B0.240 0.260 6.10 6.60

C0.150 0.170 3.81 4.31

D0.015 0.022 0.38 0.56

F0.050 0.070 1.27 1.78

G0.100 BSC 2.54 BSC

J0.009 0.013 0.23 0.33

K0.115 0.140 2.93 3.55

L0.300 BSC 7.62 BSC

M0 15 0 15

N0.020 0.040 0.51 1.02

____

SEATING

PLANE

–A–

D20 PL

–T–

0.25 (0.010) T

DW SUFFIX

SOG PACKAGE

CASE 751D–04

NOTES:

1. DIMENSIONING AND TOLERANCING PER

ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE

MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.150

(0.006) PER SIDE.

5. DIMENSION D DOES NOT INCLUDE

DAMBAR PROTRUSION. ALLOWABLE

DAMBAR PROTRUSION SHALL BE 0.13

(0.005) TOTAL IN EXCESS OF D DIMENSION

AT MAXIMUM MA TERIAL CONDITION.

–A–

–B–

0.010 (0.25) B S

D20X

0.010 (0.25)

P10X

18X K

–T–

SEATING

PLANE

RX 45

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A12.65 12.95 0.499 0.510

B7.40 7.60 0.292 0.299

C2.35 2.65 0.093 0.104

D0.35 0.49 0.014 0.019

F0.50 0.90 0.020 0.035

G1.27 BSC 0.050 BSC

J0.25 0.32 0.010 0.012

K0.10 0.25 0.004 0.009

M0 7 0 7

P10.05 10.55 0.395 0.415

R0.25 0.75 0.010 0.029

____

MC145444 MOTOROLA

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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,

and specifically disclaims any and all liability , including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different

applications. All operating parameters, including “T ypicals” must be validated for each customer application by customer’s technical experts. Motorola does

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associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.

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MC145444/D

*MC145444/D*

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