MAX3882A 查看數據表（PDF） - Maxim Integrated

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MAX3882A

2.488Gbps 1:4 Demultiplexer with Clock and Data Recovery and Limiting Amplifier

Maxim Integrated 

2.488Gbps 1:4 Demultiplexer with Clock and

Data Recovery and Limiting Amplifier

Applications Information

Clock Holdover Capability

Clock holdover is required in some applications where

a valid clock needs to be provided to the upstream

device in the absence of data transitions. To provide

this function, an external reference clock rate of

155MHz or 622MHz must be applied to the SLBI input.

Control input FREFSET selects which reference clock

rate to use. The control LREF selects whether the PLL

locks to the input data stream (SDI) or the reference

clock (SLBI). When LREF is low, the input is switched

to the reference clock input. This LREF input can be

driven by connecting the LOL output pin directly or

connecting to any other power monitor signal from the

system.

System Loopback

The MAX3882A is designed to allow system loopback

testing. The user can connect the serializer output

(MAX3892) directly to the SLBI± inputs of the

MAX3882A for system diagnostics. See Table 1 for

selecting the system loopback operation mode. During

system loopback, LOL cannot be connected to LREF.

Interfacing the MAX3882A

To correctly interface with the MAX3882A’s CML input

and LVDS outputs, refer to Application Note 291:

HFAN-1.0: Introduction to LVDS, PECL, and CML.

Layout Techniques

For best performance, use good high-frequency layout

techniques. Filter voltage supplies, keep ground con-

nections short, and use multiple vias where possible.

Use controlled-impedance transmission lines to inter-

face with the MAX3882A high-speed inputs and out-

puts. Power-supply decoupling should be placed as

close to the VCC as possible. To reduce feedthrough,

isolate input signals from output signals.

Exposed-Paddle Package

The exposed pad, 36-pin TQFN incorporates features

that provide a very low thermal-resistance path for heat

removal from the IC. The pad is electrical ground on

the MAX3882A and should be soldered to the circuit

board for proper thermal and electrical performance.

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