MAXIM MAX9249 User Manual

19-5138; Rev 4; 1/12

EVALUATION KIT

AVAILABLE

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

General Description

The MAX9249 serializer with LVDS system interface utilizes Maxim’s Gigabit multimedia serial link (GMSL) technology. The MAX9249 serializer pairs with any GMSL deserializer to form a complete digital serial link for joint transmission of high-speed video, audio, and control data.

The MAX9249 allows a maximum serial payload data rate of 2.5Gbps for a 15m shielded twisted-pair (STP) cable. The serializer operates up to a maximum clock rate of 104MHz (3-channel LVDS) or 78MHz (4-channel LVDS). This serial link supports display panels from QVGA (320 x 240) to WXGA (1280 x 800) and higher with 24-bit color.

The 3-channel mode handles three lanes of LVDS data (21 bits), UART control signals, and three audio signals. The 4-channel mode handles four lanes of LVDS data (28 bits), UART control signals, three audio signals, and/or up to three auxiliary parallel inputs. The three audio inputs form a standard I2S interface, supporting sample rates from 8kHz to 192kHz and audio word lengths of 4 to 32 bits. The embedded control channel forms a full-duplex, differential, 100kbps to 1Mbps UART link between the serializer and deserializer. The electronic control unit (ECU), or microcontroller (FC), can be located on the MAX9249 side of the link (typical for video display), on the deserializer side of the link (typical for image sensing), or on both sides. In addition, the control channel enables ECU/FC control of peripherals on the remote side, such as backlight control, grayscale Gamma correction, camera module, and touch screen. Base-mode communication with peripherals uses either I2C or the GMSL UART format. A bypass mode enables full-duplex communication using custom UART formats.

The MAX9249 serializer driver preemphasis, along with the channel equalizer on the GMSL deserializer, extends the link length and enhances the link reliability. Spread spectrum is available on the MAX9249 to reduce EMI on the serial link and the parallel output of the GMSL deserializer. The serial output complies with ISO 10605 and IEC 61000-4-2 ESD protection standards.

The core supply for the MAX9249 is 1.8V. The I/O supply ranges from 1.8V to 3.3V. The MAX9249 is available in a 48-pin TQFP package (7mm x 7mm) with an exposed pad. Electrical performance is guaranteed over the

-40NC to +105NC automotive temperature range.

Features

S Pairs with Any GMSL Deserializer S 2.5Gbps Payload Rate AC-Coupled Serial Link

with 8B/10B Line Coding

S Supports Up to WXGA (1280 x 800) with 24-Bit

Color

S 8.33MHz to 104MHz (3-Channel LVDS) or 6.25MHz

to 78MHz (4-Channel LVDS) Input Clock

S 4-Bit to 32-Bit Word Length, 8kHz to 192kHz I

Audio Channel Supports High-Definition Audio

S Embedded Half-/Full-Duplex Bidirectional Control

Channel (100kbps to 1Mbps)

S Interrupt Supports Touch-Screen Functions for

Display Panels

S Remote-End I S Preemphasis Line Driver S Programmable Spread Spectrum on the Serial

C Master for Peripherals

Outputs for Reduced EMI

S Automatic Data-Rate Detection Allows “On-the-

Fly” Data-Rate Change

S Input Clock PLL Jitter Attenuator S Built-In PRBS Generator for BER Testing of the

Serial Link

S Line-Fault Detector Detects Serial Link Shorts to

Ground, Battery, or Open Link

S ISO 10605 and IEC 61000-4-2 ESD Protection S -40NC to +105NC Operating Temperature Range S 1.8V to 3.3V I/O, 1.8V Core, and 3.3V LVDS

Supplies

S Patent Pending

Applications

High-Resolution Automotive Navigation

Rear-Seat Infotainment

Megapixel Camera Systems

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX9249GCM/V+ MAX9249GCM/V+T

/V denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.

T = Tape and reel.

-40NC to +105NC

48 TQFP-EP* 48 TQFP-EP*

MAX9249

_______________________________________________________________ Maxim Integrated Products 1

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.

Gigabit Multimedia Serial Link Serializer with LVDS System Interface

ABSOLUTE MAXIMUM RATINGS

AVDD to AGND ....................................................-0.5V to +1.9V

LVDSVDD to AGND .............................................. -0.5V to +3.9V

DVDD to GND ......................................................-0.5V to +1.9V

IOVDD to GND .....................................................-0.5V to +3.9V

Any Ground to Any Ground .................................-0.5V to +0.5V

RXIN_ _, RXCLKIN_ to AGND .............................. -0.5V to +3.9V

OUT+, OUT- to AGND .........................................-0.5V to +1.9V

LMN_ to AGND (15mA current limit) .................... -0.5V to +3.9V

MAX9249

All Other Pins to Any Ground .............. -0.5V to (V

OUT+, OUT- Short Circuit to Ground or Supply .......Continuous

Continuous Power Dissipation (TA = +70NC)

48-Pin TQFP (derate 36.2mW/NC above +70NC) ....2898.6mW

ESD Protection Human Body Model (RD = 1.5kω, CS = 100pF)

(RXIN_ _, RXCLKIN_, OUT+, OUT-) to AGND ................±8kV

All Other Pins to GND ......................................................±3kV

IOVDD

+ 0.5V)

PACKAGE THERMAL CHARACTERISTICS (Note 1)

48 TQFP-EP

Junction-to-Ambient Thermal Resistance (θJA) .......27.6NC/W

Junction-to-Case Thermal Resistance (θJC).................2NC/W

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

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.

IEC 61000-4-2 (RD = 330ω, CS = 150pF) Contact Discharge

(RXIN_ _, RXCLKIN_) to AGND .......................................±4kV

(OUT+, OUT-) to AGND ................................................±10kV

Air Discharge

(RXIN_ _, RXCLKIN_) to AGND .......................................±8kV

(OUT+, OUT-) to AGND ................................................±12kV

ISO 10605 (RD = 2kω, CS = 330pF) Contact Discharge

(RXIN_ _, RXCLKIN_) to AGND .......................................±6kV

(OUT+, OUT-) to AGND ................................................±10kV

Air Discharge

(RXIN_ _, RXCLKIN_) to AGND .....................................±20kV

(OUT+, OUT-) to AGND ................................................±30kV

Operating Temperature Range ........................ -40NC to +105NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

DC ELECTRICAL CHARACTERISTICS

= V

DVDD

+105NC, unless otherwise noted. Differential input voltage |VID| = 0.1V to 1.2V, input common-mode voltage VCM = |VID/2| to 2.4V

- |VID/2|. Typical values are at V

SINGLE-ENDED INPUTS (PWDN, SSEN, BWS, DRS, MS, CDS, AUTOS, SD/CNTL0, SCK, WS, CNTL_)

High-Level Input Voltage V

Low-Level Input Voltage V

Input Current I Input Clamp Voltage V

SINGLE-ENDED OUTPUT (INT)

High-Level Output Voltage V

Low-Level Output Voltage V

Output Short-Circuit Current I

2 ______________________________________________________________________________________

= 1.7V to 1.9V, V

AVDD

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LVDSVDD

DVDD

= 3.0V to 3.6V, V

= V

AVDD

IH1

IL1

IN1

OH1IOH

OL1IOL

= 1.7V to 3.6V, RL = 100I ±1% (differential), TA = -40NC to

IOVDD

= V

PWDN, SSEN, BWS, DRS, MS, CDS, AUTOS

SD/CNTL0, SCK, WS, CNTL_

VIN = 0 to V ICL = -18mA -1.5 V

VO = 0V

= 1.8V, V

IOVDD

= -2mA

= 2mA 0.2 V

IOVDD

LVDSVDD

IOVDD

= 3.3V, TA = +25NC.)

0.65 x

IOVDD

0.7 x

IOVDD

0.35 x

IOVDD

-10 +10

= 3.0V to 3.6V 16 35 64 = 1.7V to 1.9V 3 12 21

IOVDD

0.2

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

DC ELECTRICAL CHARACTERISTICS (continued)

= V

DVDD

+105NC, unless otherwise noted. Differential input voltage |VID| = 0.1V to 1.2V, input common-mode voltage VCM = |VID/2| to 2.4V

- |VID/2|. Typical values are at V

I2C AND UART I/O, OPEN-DRAIN OUTPUT (RX/SDA, TX/SCL, LFLT)

High-Level Input Voltage V

Low-Level Input Voltage V

Input Current I

Low-Level Open-Drain Output Voltage

DIFFERENTIAL OUTPUT (OUT+, OUT-)

Differential Output Voltage V

Change in VOD Between Complementary Output States

Output Offset Voltage (V

+ V

OUT+

Change in VOS Between Complementary Output States

Output Short-Circuit Current I

Magnitude of Differential Output Short-Circuit Current

Output Termination Resistance (Internal)

REVERSE CONTROL-CHANNEL RECEIVER (OUT+, OUT-)

High Switching Threshold V Low Switching Threshold V

LINE-FAULT DETECTION INPUT (LMN_)

Short-to-GND Threshold V Normal Thresholds V

Open Thresholds V

Open Input Voltage V Short-to-Battery Threshold V

LVDS INPUTS (RXIN_ _, RXCLKIN_)

Differential Input High Threshold V Differential Input Low Threshold V

= 1.7V to 1.9V, V

AVDD

LVDSVDD

DVDD

= 3.0V to 3.6V, V

= V

AVDD

= V

IOVDD

= 1.8V, V

= 1.7V to 3.6V, RL = 100I ±1% (differential), TA = -40NC to

LVDSVDD

= 3.3V, TA = +25NC.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IH2

IL2

IN2

OL2IOL

VIN = 0 to V

= 3mA

0.7 x

IOVDD

(Note 2) -110 +5

IOVDD

= 1.7V to 1.9V 0.4

IOVDD

= 3.0V to 3.6V 0.3

IOVDD

0.3 x

IOVDD

Preemphasis off (Figure 1) 300 400 500

OUT-

)/2 = V

OSD

CHR

CLR

3.3dB preemphasis setting, V (Figure 2)

3.3dB deemphasis setting, V (Figure 2)

Preemphasis off 1.1 1.4 1.56 V

OUT+

or V or V

= 0V -60

OUT-

= 1.9V 25

OUT-

VOD = 0V 25 mA

From OUT+, OUT- to V

AVDD

Figure 3 0.3 V Figure 3 0.57 1.07 V

Figure 3 1.45

Figure 3 1.47 1.75 V Figure 3 2.47

OD(P)

OD(D)

350 610

240 425

15 mV

45 54 63

27 mV

-27 mV

60mV

50 mV

-50 mV

MAX9249

_______________________________________________________________________________________ 3

Gigabit Multimedia Serial Link Serializer with LVDS System Interface

DC ELECTRICAL CHARACTERISTICS (continued)

= V

DVDD

+105NC, unless otherwise noted. Differential input voltage |VID| = 0.1V to 1.2V, input common-mode voltage VCM = |VID/2| to 2.4V

- |VID/2|. Typical values are at V

Input Differential Termination Resistance

MAX9249

Input Current I Power-Off Input Current I

POWER SUPPLY

Worst-Case Supply Current (Figure 4)

Sleep-Mode Supply Current I Power-Down Supply Current I

AC ELECTRICAL CHARACTERISTICS

= V

DVDD

noted. Differential input voltage |VID| = 0.15V to 1.2V, input common-mode voltage VCM = |VID/2| to 2.4V - |VID/2|. Typical values are at V

CLOCK INPUT (RXCLKIN_)

Clock Frequency f

I2C/UART PORT TIMING (Note 3)

Output Rise Time t

Output Fall Time t

Input Setup Time t Input Hold Time t

SWITCHING CHARACTERISTICS (Note 3)

Differential Output Rise/Fall Time tR, t

Total Serial Output Jitter t

Deterministic Serial Output Jitter t CNTL_ Input Setup Time t CNTL_ Input Hold Time t RXIN_ _ Skew Margin t

DVDD

= V

= 1.7V to 1.9V, V

AVDD

LVDSVDD

DVDD

= 3.0V to 3.6V, V

= V

AVDD

= V

IOVDD

= 1.8V, V

= 1.7V to 3.6V, RL = 100I ±1% (differential), TA = -40NC to

LVDSVDD

= 3.3V, TA = +25NC.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 1.7V to 1.9V, V

AVDD

= V

AVDD

IOVDD

= 1.8V, V

TERM

, I

IN+

IN0+

WCS

CCS

CCZ

PWDN = high or low, IN+ and IN- are shorted

IN-

, I

IN0-VAVDD

= V

BWS = GND

DVDD

= V

IOVDD

RXCLKIN_

= 0V -40 +40

= 16.6MHz 125 165 = 33.3MHz 135 175 = 66.6MHz 150 190 = 104MHz 175 220

LVDS inputs are not driven 45 125 PWDN = GND, LVDS inputs are not driven

= 1.7V to 3.6V, RL = 100I ±1% (differential), TA = -40NC to +105NC, unless otherwise

LVDSVDD

= 3.3V, TA = +25NC.)

85 110 135

-25 +25

5 80

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RXCLKIN_

SET

HOLD

BWS = GND, V BWS = GND, DRS = GND 16.66 104 V

= V

BWS

= V

IOVDD

30% to 70%, CL = 10pF to 100pF, 1kI pullup to IOVDD

70% to 30%, CL = 10pF to 100pF, 1kI pullup to IOVDD

I2C only (Figure 5) 100 ns I2C only (Figure 5) 0 ns

20% to 80%, VOD ≥ 400mV, RL = 100I, serial-bit rate = 3.125Gbps (Note 3)

DRS

, V

= V

DRS

IOVDD

= V

IOVDD

8.33 16.66

6.25 12.5

, DRS = GND 12.5 78

20 150 ns

90 150 ps

3.125Gbps PRBS signal, measured at VOD

TSOJ1

= 0V differential, preemphasis disabled

0.25 UI

(Figure 6)

DSOJ2

SET

HOLD

RSKM

3.125Gbps PRBS signal 0.15 UI CNTL_ (Figure 7) 3 ns CNTL_ (Figure 7) 1.5 ns Figure 8 0.3 UI

FA FA

MHz

4 ______________________________________________________________________________________

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

AC ELECTRICAL CHARACTERISTICS (continued)

= V

DVDD

noted. Differential input voltage |VID| = 0.15V to 1.2V, input common-mode voltage VCM = |VID/2| to 2.4V - |VID/2|. Typical values are at V

Serializer Delay (Note 4) t

Link Start Time t Power-Up Time t

I2S INPUT TIMING

WS Frequency f Sample Word Length n

SCK Frequency f

SCK Clock High Time (Note 3) t

SCK Clock Low Time (Note 3) t

SD/CNTL0, WS Setup Time t SD/CNTL0, WS Hold Time t

Note 2: Minimum IIN due to voltage drop across the internal pullup resistor. Note 3: Not production tested.

Note 4:

= V

DVDD

Bit time (BWS 0), (BWS V )

= 1.7V to 1.9V, V

AVDD

= V

AVDD

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= = = =

30 f 40 f

= 1.8V, V

IOVDD

××

RXCLKIN_ RXCLKIN_

= 1.7V to 3.6V, RL = 100I ±1% (differential), TA = -40NC to +105NC, unless otherwise

IOVDD

LVDSVDD

LOCK

SCKfSCK

HOLD

= 3.3V, TA = +25NC.)

Figure 9

Figure 10 3.5 ms Figure 11 3.5 ms

SET

Table 3 8 192 kHz Table 3 4 32 Bits

SCK R VIH

SCK

Figure 12 (Note 3) 2 ns Figure 12 (Note 3) 2 ns

Spread spectrum enabled 2950 Spread spectrum disabled 390

= fWS x nWS x 2

, t

= 1/f

SCK

≤ VIL, t

SCK

= 1/f

SCK

IOVDD

(8 x 4)

x 2

0.35 x t

SCK

0.35 x t

SCK

(192 x 32)

x 2

Bits

kHz

MAX9249

_______________________________________________________________________________________ 5

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

Typical Operating Characteristics

DVDD

= V

AVDD

= V

IOVDD

= 1.8V, V

LVDSVDD

= 3.3V, TA = +25NC, unless otherwise noted.)

170

MAX9249

160

150

140

130

TOTAL SUPPLY CURRENT (mA)

120

110

-10

-20

-30

-40

-50

-60

-70

OUTPUT POWER SPECTRUM (dBm)

-80

-90

120

100

TOTAL SUPPLY CURRENT

vs. RXCLKIN_ FREQUENCY

(3-CHANNEL MODE)

PRBS PATTERN

PREEMP = 0x0B TO 0x0F

PREEMP = 0x01 TO 0x04

PREEMP = 0x00

5 105

RXCLKIN FREQUENCY (MHz)

85654525

OUTPUT POWER SPECTRUM

vs. RXCLKIN_ FREQUENCY

= 33MHz

RXCLKIN_

0% SPREAD

2% SPREAD 4% SPREAD

30.5 35.5 RXCLKIN FREQUENCY (MHz)

0.5% SPREAD

34.533.532.531.5

MAXIMUM PCLK FREQUENCY

vs. STP CABLE LENGTH (BER < 10

-9

)

MAX9249 toc01

MAX9249 toc03

MAX9249 toc05

TOTAL SUPPLY CURRENT

vs. RXCLKIN_ FREQUENCY

(4-CHANNEL MODE)

165

PRBS PATTERN

160

155

PREEMP = 0x0B TO 0x0F

150

145

140

135

130

TOTAL SUPPLY CURRENT (mA)

125

120

PREEMP = 0x00

RXCLKIN FREQUENCY (MHz)

PREEMP = 0x01 TO 0x04

OUTPUT POWER SPECTRUM

vs. RXCLKIN_ FREQUENCY

= 16.5MHz

RXCLKIN_

-10 0% SPREAD

-20

-30

-40

-50

-60

-70

OUTPUT POWER SPECTRUM (dBm)

-80

-90

15.0 18.0

2% SPREAD

RXCLKIN FREQUENCY (MHz)

0.5% SPREAD

4% SPREAD

MAXIMUM RXCLKIN_ FREQUENCY

vs. 10m STP CABLE C

120

100

(BER < 10

OPTIMUM PE/EQ SETTINGS

MAX9249 toc02

65503520

MAX9249 toc04

17.517.016.516.015.5

-9)

MAX9249 toc06

MAXIMUM PCLK FREQUENCY (MHz)

OPTIMUM PE/EQ SETTINGS

NO PE, EQS = LOW

BER CAN BE AS LOW AS 10 CABLE LENGTHS LESS THAN 10m

STP CABLE LENGTH (m)

-12

FOR

15105

NO PE, EQS = LOW

MAXIMUM RXCLKIN FREQUENCY (MHz)

NO PE, EQS = HIGH

BER CAN BE AS LOW AS 10 CL < 4pF FOR OPTIMUM PE/EQ SETTINGS

STP CABLE LOAD CAPACITANCE (pF)

6 ______________________________________________________________________________________

-12

FOR

8642

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

Pin Configuration

LMN0

AVDD

OUT+

OUT-

AGND

LMN1

SSEN

TX/SCL

TOP VIEW

DRS

INT

LFLT

33 32 31 30 29 28 27 26 2536 35 34

RX/SDA

MAX9249

IOVDD

GND

DVDD

N.C.

BWS

PWDN

CDS

AUTOS

N.C. AVDD AGND

*EXPOSED PAD.

EP*

RXIN0-

RXIN0+

RXIN1-

RXIN1+

MAX9249

AGND

LVDSVDD

RXIN2-

RXIN2+

RXCLKIN-

RXIN3-

RXCLKIN+

RXIN3+

TQFP

IOVDD GND DVDD AGND CNTL2 CNTL1 WS SCK SD/CNTL0 AVDD LVDSVDD AGND

Pin Description

PIN NAME FUNCTION

1–4, 7, 8,

11, 12

5, 14 LVDSVDD

6, 13, 21,

29, 48

9, 10

15, 32, 47 AVDD

16 SD/CNTL0

17 SCK I2S Serial-Clock Input with Internal Pulldown to GND 18 WS I2S Word-Select Input with Internal Pulldown to GND

19 CNTL1

RXIN_-, RXIN_+

Differential LVDS Data Inputs. Set BWS = low (3-channel mode) to use RXIN0_ to RXIN2_. Set BWS = high (4-channel mode) to use RXIN0_ to RXIN3_.

3.3V LVDS Power Supply. Bypass LVDSVDD to AGND with 0.1FF and 0.001FF capacitors as close as possible to the device with the smaller value capacitor closest to LVDSVDD.

AGND Analog Ground

RXCLKIN-, RXCLKIN+

LVDS Input for the LVDS Clock

1.8V Analog Power Supply. Bypass AVDD to AGND with 0.1FF and 0.001FF capacitors as close as possible to the device with the smaller value capacitor closest to AVDD.

I2S Serial-Data Input with Internal Pulldown to GND. Disable I2S to use SD/CNTL0 as an additional input.

Control Input 1 with Internal Pulldown to GND. Data is latched every RXCLKIN_ cycle (Figure 7). CNTL1 is not available in 3-channel mode. Drive BWS high (4-channel mode) to use this input. CNTL1 or RES (RES from VESA Standard Panel Specification) is mapped to DIN27 (see the Reserved Bit (RES) section).

_______________________________________________________________________________________ 7

Gigabit Multimedia Serial Link Serializer with LVDS System Interface

Pin Description (continued)

PIN NAME FUNCTION

Control Input 2 with Internal Pulldown to GND. Data is latched every RXCLKIN_ cycle (Figure 7).

20 CNTL2

22, 39 DVDD

MAX9249

23, 38 GND Digital and I/O Ground

24, 37 IOVDD

25 RX/SDA

26 TX/SCL

27 SSEN

28 LMN1 Line-Fault Monitor Input 1 (see Figure 3 for details)

30, 31

33 LMN0 Line-Fault Monitor Input 0 (see Figure 3 for details)

35 INT

36 DRS

40, 46 N.C. Internally Not Connected. Connect to GND or leave unconnected.

41 BWS

43 CDS

44 MS

OUT-, OUT+

LFLT

PWDN

CNTL2 is not available in 3-channel mode. Drive BWS high (4-channel mode) to use this input. CNTL2 is mapped to DIN28.

1.8V Digital Power Supply. Bypass DVDD to GND with 0.1FF and 0.001FF capacitors as close as possible to the device with the smaller value capacitor closest to DVDD.

I/O Supply Voltage. 1.8V to 3.3V logic I/O power supply. Bypass IOVDD to GND with 0.1FF and

0.001FF capacitors as close as possible to the device with the smallest value capacitor closest to IOVDD.

Receive/Serial Data. UART receive or I2C serial-data input/output with internal 30kI pullup to IOVDD. In UART mode, RX/SDA is the Rx input of the MAX9249’s UART. In I2C mode, RX/SDA is the SDA input/output of the MAX9249’s I2C master.

Transmit/Serial Clock. UART transmit or I2C serial-clock output with internal 30kI pullup to IOVDD. In UART mode, TX/SCL is the Tx output of the MAX9249’s UART. In I2C mode, TX/SCL is the SCL output of the MAX9249’s I2C master.

Spread-Spectrum Enable. Serial link spread-spectrum enable input requires external pulldown or pullup resistors. The state of SSEN latches upon power-up or when resuming from power-down mode (PWDN = low). Set SSEN = high for Q0.5% spread spectrum on the serial link. Set SSEN = low to use the serial link without spread spectrum.

Differential CML Output+/-. Differential outputs of the serial link.

Line Fault. Active-low, open-drain line-fault output with a 60kI internal pullup resistor. LFLT = low indicates a line fault. LFLT is high impedance when PWDN = low.

Interrupt Output to Indicate Remote Side Requests. INT = low upon power-up and when PWDN = low. A transition on the INT input of the GMSL deserializer toggles the MAX9249’s INT output.

Data-Rate Select. Data-rate range-selection input requires external pulldown or pullup resistors. Set DRS = high for RXCLKIN_ frequencies of 8.33MHz to 16.66MHz (3-channel mode) or 6.25MHz to 12.5MHz (4-channel mode). Set DRS = low for RXCLKIN_ frequencies of 16.66MHz to 104MHz (3-channel mode) or 12.5MHz to 78MHz (4-channel mode).

Bus-Width Select. Input width selection requires external pulldown or pullup resistors. Set BWS = low for 3-channel mode. Set BWS = high for 4-channel mode.

Power-Down. Active-low power-down input requires external pulldown or pullup resistors.

Control Direction Selection. Control link direction selection input requires external pulldown or pullup resistors. Set CDS = low for FC use on the MAX9249 side of the serial link. Set CDS = high for FC use on the GMSL deserializer side of the serial link.

Mode Select. Control link mode-selection input requires external pulldown or pullup resistors. Set MS = low to select base mode. Set MS = high to select the bypass mode.

8 ______________________________________________________________________________________

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

Pin Description (continued)

PIN NAME FUNCTION

Autostart Setting. Active-low power-up mode-selection input requires external pulldown or pullup

AUTOS

— EP

Functional Diagram

resistors. Set AUTOS = high to power up the device with no link active. Set AUTOS = low to have the MAX9249 power up the serial link with autorange detection (see Tables 8 and 9).

Exposed Pad. EP internally connected to AGND. MUST externally connect EP to the AGND plane for proper thermal and electrical performance.

LFLT

MAX9249

RXCLKIN+/-

RXIN1+/-

RXIN2+/-

RXIN3+/-

CNTL1

CNTL2

WS,

SD/CNTL0,

SCK

TX/SCL

RX/SDA

7x PLL

SPRXIN0+/-

AUDIO FIFO

PRBS GEN

MUX

DIVIDE BY 7

FIFO

DIN[6:0]

DIN[13:7]

DIN[20:14]

DIN[26:21]

DIN27

DIN28

ACB

FILTER PLL

CLKDIV

8B/10B

ENCODE

PARITY

UART/I2C

GMSL DESERIALIZER

SPREAD PLL

TERM

REV CH Rx

LINE-FAULT DET

MAX9249

CML Tx

LMN0

LMN1

OUT+

OUT-

STP CABLE,

= 100I

(DIFF)

IN-

IN+

_______________________________________________________________________________________ 9

Gigabit Multimedia Serial Link Serializer with LVDS System Interface

OUT+

OUT-

MAX9249

OUT-

OUT+

(OUT+) - (OUT-)

Figure 1. Serial-Output Parameters

OS(-)

OD(-)

GND

((OUT+) + (OUT-))/2

OS(+)

= |V

- V

OS(-)

- V

OD(-)

OD(P)VOD(D)

OS(+)

VOD(+)

DVOD = |V

OD(+)

OUT+

OUT-

OS(-)

OD(-)

= 0V

SERIAL-BIT

TIME

Figure 2. Output Waveforms at OUT+ and OUT-

10 _____________________________________________________________________________________

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

1.7V TO 1.9V

MAX9249

LFLT

OUTPUT

LOGIC

(OUT+)

OUTPUT

LOGIC

(OUT-)

MAX9249

REFERENCE

VOLTAGE

GENERATOR

OUT+

OUT-

45kI*

LMN0

LMN1

5kI*

45kI*

5kI*

TWISTED PAIR

50kI* 50kI*

CONNECTORS

Figure 3. Line-Fault Detector Circuit

RXIN0+ TO RXIN3+

RXIN0- TO RXIN3-

Figure 4. Worst-Case Pattern Input

______________________________________________________________________________________ 11

*Q1% TOLERANCE

RXCLKIN+

RXCLKIN-

CNTL_

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