MAX96708 datasheet(30/68 Pages) MAXIM

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Adaptive Line Equalizer

The deserializer includes an adaptive line equalizer to

compensate for higher cable attenuation at higher frequen-

cies. The cable equalizer has 12 levels of compensation

to handle up to 30m coax and 15m STP cable lengths.

At initial lock, the adaptive equalizer selects the optimum

compensation level. The device can be programmed to

re-adapt periodically, or manually to compensate for any

significant changes in the transmission environment.

Spread-Spectrum Tracking

The deserializer can track a spread input clock, eliminating

the need for multiple spread clocks.

Cable-Type Configuration and Input MUX

The driver inputs are programmable for two kinds of

cable: 100Ω twisted pair and 50Ω coax (contact the

factory for devices compatible with 75Ω cables). In

coax mode, connect IN0+ to OUT+ of the serializer.

Connect IN1+ to OUT+ of the second serializer. Control-

channel data is sent to the serializer selected with the

GMSL_IN_SEL bit. Leave all unused IN_ pins uncon-

nected, or connect them to ground through 50Ω and a

capacitor for increased power-supply rejection. If OUT- is

not used, connect OUT- to VDD through a 50Ω resistor

(Figure 16). When there are μCs at the serializer, and

at each deserializer, only one μC can communicate at a

time. Disable forward and reverse channel links according

to the communicating deserializer connection to prevent

contention in I2C-to-I2C mode.

Crosspoint Switch

The crosspoint switch routes data between the parallel

input/output and the SerDes (Figure 17). The anything-to-

anything routing assures the mapping between the video

source and destination.

Figure 16. Coax Connection

Figure 17. Crosspoint-Switch Dataflow

OUT+

OUT-

IN+

OPTIONAL COMPONENTS

FOR INCREASED

POWER-SUPPLY REJECTION

IN-

AVDD

50Ω

SERIALIZER

GMSL

DESERIALIZER

TO OUTPUT PINS

DOUT0

DOUT1

DOUT12

DOUT13

XBI0

XBI1

XBI12

XBI13

CROSSBAR_

DOUT_

14 SWITCHES

XBI0

XBI1

XBI12

XBI13

D12

D13

DATA

www.maximintegrated.com

Maxim Integrated │ 30

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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