For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX9217 digital video parallel-to-serial converter
serializes 27 bits of parallel data into a serial data stream.
Eighteen bits of video data and 9 bits of control data are
encoded and multiplexed onto the serial interface, reduc-
ing the serial data rate. The data enable input determines
when the video or control data is serialized.
The MAX9217 pairs with the MAX9218 deserializer to
form a complete digital video serial link. Interconnect
can be controlled-impedance PCB traces or twisted-pair
cable. Proprietary data encoding reduces EMI and pro-
vides DC balance. DC balance allows AC-coupling,
providing isolation between the transmitting and receiv-
ing ends of the interface. The LVDS output is internally
terminated with 100Ω.
ESD tolerance is specified for ISO 10605 with ±10kV
contact discharge and ±30kV air discharge.
The MAX9217 operates from a +3.3V core supply and
features a separate input supply for interfacing to 1.8V
to 3.3V logic levels. This device is available in 48-lead
Thin QFN and LQFP packages and is specified from
-40°C to +85°C.
Applications
Navigation System Display
In-Vehicle Entertainment System
Video Camera
LCD Displays
Features
♦Proprietary Data Encoding for DC Balance and
Reduced EMI
♦Control Data Sent During Video Blanking
♦Five Control Data Inputs Are Single-Bit-Error
Tolerant
♦Output Common-Mode Filter Reduces EMI
♦Greater than 10m STP Cable Drive
♦Wide ±2% Reference Clock Tolerance
♦ISO 10605 ESD Protection
♦Separate Input Supply Allows Interface to 1.8V to
3.3V Logic
♦+3.3V Core Supply
♦Space-Saving Thin QFN and LQFP Packages
♦-40°C to +85°C Operating Temperature
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
________________________________________________________________
Maxim Integrated Products
1
RNG0
RNG1
VCCLVDS
OUT+
OUT-
LVDS GND
LVDS GND
CMF
PWRDWN
VCCPLL
PLL GND
I.C.
GND
VCCIN
RGB_IN10
RGB_IN11
RGB_IN12
RGB_IN13
RGB_IN14
RGB_IN15
RGB_IN16
RGB_IN17
CNTL_IN0
CNTL_IN1
RNG0
RNG1
VCCLVDS
OUT+
OUT-
LVDS GND
LVDS GND
CMF
PWRDWN
VCCPLL
PLL GND
I.C.
TOP VIEW
I.C.
PCLK_IN
DE_IN
CNTL_IN8
CNTL_IN7
CNTL_IN6
CNTL_IN5
CNTL_IN4
CNTL_IN3
CNTL_IN2
VCC
GND
GND
VCC
RGB_IN0
RGB_IN1
RGB_IN2
RGB_IN3
RGB_IN4
RGB_IN5
RGB_IN6
RGB_IN7
RGB_IN8
RGB_IN9
GND
VCCIN
RGB_IN10
RGB_IN11
RGB_IN12
RGB_IN13
RGB_IN14
RGB_IN15
RGB_IN16
RGB_IN17
CNTL_IN0
CNTL_IN1
37
38
39
40
41
42
43
44
45
46
47
48
24
23
22
21
20
19
18
17
16
15
14
13
LQFP
MAX9217
36
35
34
33
32
31
30
29
28
27
26
25
1
2
3
4
5
6
7
8
9
10
11
12
+
37
38
39
40
41
42
43
44
45
46
47
48
24
23
22
21
20
19
18
17
16
15
14
13
MAX9217
36
35
34
33
32
31
30
29
28
27
26
25
I.C
PCLK_IN
DE_IN
CNTL_IN8
CNTL_IN7
CNTL_IN6
CNTL_IN5
CNTL_IN4
CNTL_IN3
CNTL_IN2
VCC
GND
GND
VCC
RGB_IN0
RGB_IN1
RGB_IN2
RGB_IN3
RGB_IN4
RGB_IN5
RGB_IN6
RGB_IN7
RGB_IN8
RGB_IN9
THIN QFN-EP
+
1
2
3
4
5
6
7
8
9
10
11
12
PART TEMP RANGE PIN-
PACKAGE
MAX9217ECM+ -40°C to +85°C 48 LQFP
MAX9217ECM/V+ -40°C to +85°C 48 LQFP
MAX9217ETM+ -40°C to +85°C 48 Thin QFN-EP*
Pin Configurations
Ordering Information
19-3558; Rev 4; 8/09
EVALUATION KIT
AVAILABLE
+
Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*
EP = Exposed pad.
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC_ = +3.0V to +3.6V, RL= 100Ω±1%, PWRDWN = high, TA= -40°C to +85°C, unless otherwise noted. Typical values are at
VCC_ = +3.3V, TA= +25°C.) (Notes 1, 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCC_ to _GND........................................................-0.5V to +4.0V
Any Ground to Any Ground...................................-0.5V to +0.5V
OUT+, OUT- to LVDS GND ...................................-0.5V to +4.0V
OUT+, OUT- Short Circuit to LVDS GND
or VCCLVDS.............................................................Continuous
OUT+, OUT- Short Through 0.125µF (or smaller),
25V Series Capacitor..........................................-0.5V to +16V
RGB_IN[17:0], CNTL_IN[8:0], DE_IN,
RNG0, RNG1, PCLK_IN,
PWRDWN, CMF to GND......................-0.5V to (VCCIN + 0.5V)
Continuous Power Dissipation (TA= +70°C)
48-Lead LQFP (derate 21.7mW/°C above +70°C) ....1739mW
48-Lead Thin QFN (derate 37mW/°C above +70°C) .2963mW
ESD Protection
Machine Model (RD= 0Ω, CS= 200pF)
All Pins to GND ..............................................................±200V
Human Body Model (RD= 1.5kΩ, CS= 100pF)
All Pins to GND ................................................................±2kV
ISO 10605 (RD= 2kΩ, CS= 330pF)
Contact Discharge (OUT+, OUT-) to GND ....................±10kV
Air Discharge (OUT+, OUT-) to GND ............................±30kV
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SINGLE-ENDED INPUTS (RGB_IN[17:0], CNTL_IN[8:0], DE_IN, PCLK_IN, PWRDWN, RNG_)
VCCIN = 1.71V to <3V 0.65VCCIN VCCIN + 0.3
High-Level Input Voltage VIH 2V
CCIN + 0.3 V
VCCIN = 1.71V to <3V -0.3 0.3VCCIN
Low-Level Input Voltage VIL -0.3 +0.8 V
Input Current IIN
VIN = -0.3V to (VCCIN + 0.3V),
VCCIN = 1.71V to 3.6V,
PWRDWN = high or low
-70 +70 µA
Input Clamp Voltage VCL ICL = -18mA -1.5 V
LVDS OUTPUTS (OUT+, OUT-)
Differential Output Voltage VOD Figure 1 250 335 450 mV
Change in VOD Between
Complementary Output States ΔVOD Figure 1 20 mV
Common-Mode Voltage VOS Figure 1 1.125 1.29 1.375 V
Change in VOS Between
Complementary Output States ΔVOS Figure 1 20 mV
Output Short-Circuit Current IOS VOUT+ or VOUT- = 0 or 3.6V -15 ±8 +15 mA
Magnitude of Differential Output
Short-Circuit Current IOSD VOD = 0 5.5 15 mA
VOUT+ = 0,
VOUT- = 3.6V
Output High-Impedance Current IOZ
PWRDWN = low
or
VCC_ = 0 VOUT+ = 3.6V,
VOUT- = 0
-1 +1 µA
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(VCC_ = +3.0V to +3.6V, RL= 100Ω±1%, CL= 5pF, PWRDWN = high, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at VCC_ = +3.3V, TA= +25°C.) (Note 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PCLK_IN TIMING REQUIREMENTS
Clock Period tTFigure 2 28.57 333.00 ns
Clock Frequency fCLK 3 35 MHz
Clock Frequency Difference from
Deserializer Reference Clock ΔfCLK -2 +2 %
Clock Duty Cycle DC tHIGH/tT or tLOW/tT, Figure 2 35 50 65 %
Clock Transition Time tR, tFFigure 2 2.5 ns
SWITCHING CHARACTERISTICS
Output Rise Time tRISE 20% to 80%, VOD ≥ 250mV,
modulation off, Figure 3 215 350 ps
Output Fall Time tFALL 80% to 20%, VOD ≥ 250mV,
modulation off, Figure 3 206 350 ps
Input Setup Time tSET Figure 4 3 ns
Input Hold Time tHOLD Figure 4 3 ns
Serializer Delay tSD Figure 5 3.15 x
tT
3.2 x
tTns
PLL Lock Time tLOCK Figure 6 16385 x
tTns
Power-Down Delay tPD Figure 7 1 µs
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC_ = +3.0V to +3.6V, RL= 100Ω±1%, PWRDWN = high, TA= -40°C to +85°C, unless otherwise noted. Typical values are at
VCC_ = +3.3V, TA= +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Differential Output Resistance RO78 110 147 Ω
3MHz 15 25
5MHz 18 25
10MHz 23 28
20MHz 33 39
Worst-Case Supply Current ICCW
RL = 100Ω ± 1%,
CL = 5pF,
continuous 10
transition words,
modulation off 35MHz 50 70
mA
Power-Down Supply Current ICCZ (Note 3) 50 µA
WORST-CASE PATTERN
SUPPLY CURRENT vs. FREQUENCY
MAX9217 toc01
FREQUENCY (MHz)
SUPPLY CURRENT (mA)
3127231915117
10
20
30
40
50
60
0
335
Typical Operating Characteristics
(TA= +25°C, VCC_ = +3.3V, RL= 100Ω, modulation off, unless otherwise noted.)
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC_ = +3.0V to +3.6V, RL= 100Ω±1%, CL= 5pF, PWRDWN = high, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at VCC_ = +3.3V, TA= +25°C.) (Note 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
700Mbps data rate,
CMF open, Figure 8 22 70
Peak-to-Peak Output Offset
Voltage VOSp-p 700Mbps data rate,
CMF 0.1µF to ground, Figure 8 12 50
mV
Note 1: Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground
except VOD, ΔVOD, and ΔVOS.
Note 2: Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are production
tested at TA= +25°C.
Note 3: All LVTTL/LVCMOS inputs, except PWRDWN at ≤0.3V or ≥VCCIN - 0.3V. PWRDWN is ≤0.3V.
Note 4: AC parameters are guaranteed by design and characterization and are not production tested. Limits are set at ±6 sigma.
MAX9217
Pin Description
PIN NAME FUNCTION
1, 13, 37 GND Input Buffer Supply and Digital Supply Ground
2V
CCIN Input Buffer Supply Voltage. Bypass to GND with 0.1µF and 0.001µF capacitors in parallel as
close to the device as possible, with the smallest value capacitor closest to the supply pin.
3–10,
39–48 RGB_IN[17:0]
LVTTL/LVCMOS Red, Green, and Blue Digital Video Data Inputs. Eighteen data bits are loaded
into the input latch on the rising edge of PCLK_IN when DE_IN is high. Internally pulled down to
GND.
11, 12, 15–21 CNTL_IN[8:0] LVTTL/LVCMOS Control Data Inputs. Control data are latched on the rising edge of PCLK_IN
when DE_IN is low. Internally pulled down to GND.
14, 38 VCC Digital Supply Voltage. Bypass to GND with 0.1µF and 0.001µF capacitors in parallel as close to
the device as possible, with the smallest value capacitor closest to the supply pin.
22 DE_IN
LVTTL/LVCMOS Data Enable Input. Logic-high selects RGB_IN[17:0] to be latched. Logic-low
selects CNTL_IN[8:0] to be latched. DE_IN must be switching for proper operation. Internally
pulled down to GND.
23 PCLK_IN LVTTL/LVCMOS Parallel Clock Input. Latches data and control inputs and provides the PLL
reference clock. Internally pulled down to GND.
24, 25 I.C. Internally connected to GND. Connect to GND or leave unconnected.
26 PLL GND PLL Supply Ground
27 VCCPLL PLL Supply Voltage. Bypass to PLL GND with 0.1µF and 0.001µF capacitors in parallel as close
to the device as possible, with the smallest value capacitor closest to the supply pin.
28 PWRDWN LVTTL/LVCMOS Power-Down Input. Internally pulled down to GND.
29 CMF Common-Mode Filter. Optionally connect a capacitor between CMF and ground to filter
common-mode switching noise.
30, 31 LVDS GND LVDS Supply Ground
32 OUT- Inverting LVDS Serial Data Output
33 OUT+ Noninverting LVDS Serial Data Output
34 VCCLVDS LVDS Supply Voltage. Bypass to LVDS GND with 0.1µF and 0.001µF capacitors in parallel as
close to the device as possible, with the smallest value capacitor closest to the supply pin.
35 RNG1 LVTTL/LVCMOS Frequency Range Select Input. Set to the frequency range that includes the
PCLK_IN frequency as shown in Table 3. Internally pulled down to GND.
36 RNG0 LVTTL/LVCMOS Frequency Range Select Input. Set to the frequency range that includes the
PCLK_IN frequency as shown in Table 3. Internally pulled down to GND.
— EP Exposed Pad (Thin QFN Package Only). Connect Thin QFN exposed pad to PCB GND.
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
_______________________________________________________________________________________ 5
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
6 _______________________________________________________________________________________
Functional Diagram
MAX9217
TIMING AND CONTROL
DC BALANCE/
ENCODE
INPUT LATCH
RGB_IN
CNTL_IN
DE_IN
PCLK_IN
RNG0
RNG1
PWRDWN
1
0
OUT+
OUT-
CMF
PLL
PAR-TO-SER
OUT-
VOD
VOS
GND
RL / 2
RL / 2
OUT+
OUT-
OUT+
(OUT+) - (OUT-)
VOS(-) VOS(+)
((OUT+) + (OUT-)) / 2
VOS(-)
VOD(-)
VOD(-)
VOD = 0V
ΔVOS = |VOS(+) - VOS(-)|
ΔVOD = |VOD(+) - VOD(-)|
VOD(+)
Figure 1. LVDS DC Output Load and Parameters
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
_______________________________________________________________________________________ 7
VILmax
tHIGH
tLOW
tT
tR
tF
VIHmin
PCLK_IN
Figure 2. Parallel Clock Requirements
OUT-
CLCL
RL
OUT+
tFALL
20%20%
(OUT+) - (OUT-)
80%
80%
tRISE
Figure 3. Output Rise and Fall Times
VIHmin
VIHmin
VIHmin
VILmax VILmax
VILmax
PCLK_IN
RGB_IN[17:0]
CNTL_IN[8:0]
DE_IN
tHOLD
tSET
Figure 4. Synchronous Input Timing
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
8 _______________________________________________________________________________________
tSD BIT 0 BIT 19
N
N + 3
EXPANDED TIME SCALE
N + 4
NN + 1 N + 2
N - 1
RGB_IN
CNTL_IN
PCLK_IN
OUT_
Figure 5. Serializer Delay
VOD = 0V
HIGH-Z
VILmax
tLOCK
PWRDWN
(OUT+) - (OUT-)
PCLK_IN
Figure 6. PLL Lock Time
HIGH-Z
VILmax
tPD
PWRDWN
(OUT+) - (OUT-)
PCLK_IN
Figure 7. Power-Down Delay
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
_______________________________________________________________________________________ 9
Detailed Description
The MAX9217 DC-balanced serializer operates at a
parallel clock frequency of 3MHz to 35MHz, serializing
18 bits of parallel video data RGB_IN[17:0] when the
data enable input DE_IN is high, or 9 bits of parallel
control data CNTL_IN[8:0] when DE_IN is low. The
RGB video input data are encoded using 2 overhead
bits, EN0 and EN1, resulting in a serial word length of
20 bits (Table 1). Control inputs are mapped to 19 bits
and encoded with 1 overhead bit, EN0, also resulting in
a 20-bit serial word. Encoding reduces EMI and main-
tains DC balance across the serial cable. Two transition
words, which contain a unique bit sequence, are insert-
ed at the transition boundaries of video-to-control and
control-to-video phases.
Control data inputs C0 to C4 are mapped to 3 bits each
in the serial control word (Table 2). At the deserializer,
2 or 3 bits at the same state determine the state of the
recovered bit, providing single bit-error tolerance for
C0 to C4. Control data that may be visible if an error
occurs, such as VSYNC and HSYNC, can be connect-
ed to these inputs. Control data inputs C5 to C8 are
mapped to 1 bit each.
OUT-
OUT+
((OUT+) + (OUT-)) / 2 VOS(P-P)
VOS(P-P)
012345678910111213141516171819
EN0 EN1 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17
Figure 8. Peak-to-Peak Output Offset Voltage
Bit 0 is the LSB and is serialized first. EN[1:0] are encoding bits. S[17:0] are encoded symbols.
Table 1. Serial Video Phase Word Format
012345678910111213141516171819
E N 0C0C0C0C1C1C1C2C2C2C3C3C3C4C4C4C5C6C7C8
Bit 0 is the LSB and is serialized first. C[8:0] are the control inputs.
Table 2. Serial Control Phase Word Format
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
10 ______________________________________________________________________________________
Transition Timing
The transition words require interconnect bandwidth
and displace control data. Therefore, control data is not
sampled (see Figure 9):
• Two clock cycles before DE_IN goes high.
• During the video phase.
• Two clock cycles after DE_IN goes low.
The last sampled control data are latched at the deserial-
izer control data outputs during the transition and video
phases. Video data are latched at the deserializer RGB
data outputs during the transition and control phases.
Applications Information
AC-Coupling Benefits
AC-coupling increases the common-mode voltage to
the voltage rating of the capacitor. Two capacitors are
sufficient for isolation, but four capacitors—two at the
serializer output and two at the deserializer input—pro-
vide protection if either end of the cable is shorted to a
high voltage. AC-coupling blocks low-frequency
ground shifts and common-mode noise. The MAX9217
serializer can also be DC-coupled to the MAX9218
deserializer.
Figure 10 shows an AC-coupled serializer and deserial-
izer with two capacitors per link, and Figure 11 is the
AC-coupled serializer and deserializer with four capaci-
tors per link.
Selection of AC-Coupling Capacitors
See Figure 12 for calculating the capacitor values for
AC-coupling, depending on the parallel clock frequen-
cy. The plot shows capacitor values for two- and four-
capacitor-per-link systems. For applications using less
than 18MHz clock frequency, use 0.1µF capacitors.
Frequency-Range Setting RNG[1:0]
The RNG[1:0] inputs select the operating frequency
range of the MAX9217 serializer. An external clock with-
in this range is required for operation. Table 3 shows
the selectable frequency ranges and corresponding
data rates for the MAX9217.
PCLK_IN
CNTL_IN
DE_IN
RGB_IN
= NOT SAMPLED BY PCLK_IN
CONTROL
PHASE
CONTROL
PHASE
TRANSITION
PHASE
TRANSITION
PHASE
VIDEO PHASE
Figure 9. Transition Timing
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
______________________________________________________________________________________ 11
MAX9217
PAR-TO-SER
TIMING AND
CONTROL
DC BALANCE/
ENCODE
INPUT LATCH
RGB_IN
CNTL_IN
DE_IN
PCLK_IN
RNG0
RNG1
PWRDWN
1
0
130Ω
VCC
130Ω
IN
OUT
82Ω82Ω
CMF
RNG1
RNG0
MAX9218
SER-TO-PAR
TIMING AND
CONTROL
PLL
DC BALANCE/
DECODE
1
0
R/F
OUTEN
RGB_OUT
LOCK
PWRDWN
REF_IN
PCLK_OUT
DE_OUT
CNTL_OUT
CERAMIC RF SURFACE-MOUNT CAPACITOR 100Ω DIFFERENTIAL STP CABLE
PLL
*
*
*CAPACITORS CAN BE AT EITHER END.
Figure 10. AC-Coupled Serializer and Deserializer with Two Capacitors per Link
MAX9217
PAR-TO-SER
TIMING AND
CONTROL
DC BALANCE/
ENCODE
INPUT LATCH
RGB_IN
CNTL_IN
DE_IN
PCLK_IN
RNG0
RNG1
PWRDWN
1
0
130Ω
VCC
130Ω
IN
OUT
82Ω82Ω
CMF
RNG1
RNG0
MAX9218
SER-TO-PAR
TIMING AND
CONTROL
PLL
DC BALANCE/
DECODE
1
0
R/F
OUTEN
RGB_OUT
LOCK
PWRDWN
REF_IN
PCLK_OUT
DE_OUT
CNTL_OUT
CERAMIC RF SURFACE-MOUNT CAPACITOR 100Ω DIFFERENTIAL STP CABLE
PLL
Figure 11. AC-Coupled Serializer and Deserializer with Four Capacitors per Link
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
12 ______________________________________________________________________________________
Termination
The MAX9217 has an integrated 100Ωoutput-termina-
tion resistor. This resistor damps reflections from
induced noise and mismatches between the transmis-
sion line impedance and termination resistors at the
deserializer input. With PWRDWN = low or with the sup-
ply off, the output termination is switched out and the
LVDS output is high impedance.
Common-Mode Filter
The integrated 100Ωoutput termination is made up of
two 50Ωresistors in series. The junction of the resistors
is connected to the CMF pin for connecting an optional
common-mode filter capacitor. Connect the filter
capacitor to ground close to the MAX9217 as shown in
Figure 13. The capacitor shunts common-mode switch-
ing current to ground to reduce EMI.
RNG1 RNG0 PARALLEL
CLOCK (MHz)
SERIAL DATA RATE
(Mbps)
0 0 3 to 5 60 to 100
0 1 5 to10 100 to 200
1 0 10 to 20 200 to 400
1 1 20 to 35 400 to 700
AC-COUPLING CAPACITOR VALUE
vs. PARALLEL CLOCK FREQUENCY
MAX9217 fig12
PARALLEL CLOCK FREQUENCY (MHz)
CAPACITOR VALUE (nF)
333021 24 27
35
50
65
80
95
110
125
140
20
18 36
TWO CAPACITORS PER LINK
FOUR CAPACITORS PER LINK
Figure 12. AC-Coupling Capacitor Values vs. Clock Frequency
of 18MHz to 35MHz
Table 3. Parallel Clock Frequency Range
Select
OUT+
RO / 2
RO / 2
CMF
OUT-
CCMF
Figure 13. Common-Mode Filter Capacitor Connection
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
______________________________________________________________________________________ 13
Power-Down and Power-Off
Driving PWRDWN low stops the PLL, switches out the
integrated 100Ωoutput termination, and puts the output
in high impedance to ground and differentially. With
PWRDWN ≤0.3V and all LVTTL/LVCMOS inputs ≤0.3V or
≥VCCIN - 0.3V, supply current is reduced to 50µA or less.
Driving PWRDWN high starts PLL lock to PCLK_IN and
switches in the 100Ωoutput termination resistor. The
LVDS output is not driven until the PLL locks. The LVDS
output is high impedance to ground and 100Ωdifferen-
tial. The 100Ωintegrated termination pulls OUT+ and
OUT- together while the PLL is locking so that VOD = 0V.
If VCC = 0, the output resistor is switched out and the LVDS
outputs are high impedance to ground and differentially.
PLL Lock Time
The PLL lock time is set by an internal counter. The lock
time is 16,385 PCLK_IN cycles. Power and clock should
be stable to meet the lock-time specification.
Input Buffer Supply
The single-ended inputs (RGB_IN[17:0], CNTL_IN[8:0],
DE_IN, RNG0, RNG1, PCLK_IN, and PWRDWN) are
powered from VCCIN. VCCIN can be connected to a
1.71V to 3.6V supply, allowing logic inputs with a nomi-
nal swing of VCCIN. If no power is applied to VCCIN
when power is applied to VCC, the inputs are disabled
and PWRDWN is internally driven low, putting the
device in the power-down state.
Power-Supply Circuits and Bypassing
The MAX9217 has isolated on-chip power domains. The
digital core supply (VCC) and single-ended input supply
(VCCIN) are isolated but have a common ground (GND).
The PLL has separate power and ground (VCCPLL and
VCCPLL GND) and the LVDS input also has separate
power and ground (VCCLVDS and VCCLVDS GND). The
grounds are isolated by diode connections. Bypass each
VCC, VCCIN, VCCPLL, and VCCLVDS pin with high-frequen-
cy, surface-mount ceramic 0.1µF and 0.001µF capacitors
in parallel as close to the device as possible, with the
smallest value capacitor closest to the supply pin.
LVDS Output
The LVDS output is a current source. The voltage swing
is proportional to the termination resistance. The output
is rated for a differential load of 100Ω±1%.
Cables and Connectors
Interconnect for LVDS typically has a differential imped-
ance of 100Ω. Use cables and connectors that have
matched differential impedance to minimize impedance
discontinuities.
Twisted-pair and shielded twisted-pair cables offer
superior signal quality compared to ribbon cable and
tend to generate less EMI due to magnetic field cancel-
ing effects. Balanced cables pick up noise as common
mode, which is rejected by the LVDS receiver.
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
14 ______________________________________________________________________________________
Board Layout
Separate the LVTTL/LVCMOS inputs and LVDS output to
prevent crosstalk. A four-layer PCB with separate layers
for power, ground, and signals is recommended.
ESD Protection
The MAX9217 ESD tolerance is rated for Human Body
Model, Machine Model, and ISO 10605. ISO 10605
specifies ESD tolerance for electronic systems. The
Human Body Model, Machine Model, discharge com-
ponents are CS= 100pF and RD= 1.5kΩ(Figure 14).
The ISO 10605 discharge components are CS= 330pF
and RD= 2kΩ(Figure 15). The Machine Model dis-
charge components are CS= 200pF and RD= 0Ω
(Figure 16).
Chip Information
PROCESS: CMOS
Figure 14. Human Body ESD Test Circuit
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
1MΩ
RD
1.5kΩ
CS
100pF
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
50Ω TO 100Ω
RD
2kΩ
CS
330pF
Figure 15. ISO 10605 Contact-Discharge ESD Test Circuit
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
RD
0Ω
CS
200pF
Figure 16. Machine Model ESD Test Circuit
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
48 LQFP C48+5 21-0054
48 TQFN T4866+1 21-0141
MAX9217
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
3 5/08 Corrected LQFP package, removed MOD function pins, added Machine Model
ESD, and corrected diagrams 1, 2, 5, 6, 10–15
4 8/09 Added automotive qualified part to Ordering Information 1
Revision History
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________
15
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