MAX3874 datasheet(2/8 Pages) MAXIM

Part #	MAX3874

Description	MAX3872/MAX3874 Evaluation Kits

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Manufacturer	MAXIM [Maxim Integrated Products]

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MAX3872/MAX3874 Evaluation Kits

2 ________________________________________________________________________________________

_______________ Detailed Description

The MAX3872/MAX3874 EV Kit is a fully assembled

and factory tested demonstration board that enables

testing of all MAX3872 and MAX3874 functions.

Test Equipment Required

•

+3.3V power supply with 200mA current capability

•

Signal-source, 2.7Gbps minimum capability

•

Jitter analyzer capable of 2.7Gbps performance

•

Oscilloscope with at least 3GHz performance

Test Equipment Interface

The serial inputs (SDI±, SLBI±) and serial outputs

(SDO±,

SCLKO±)

have

on-board

AC-coupling

capacitors to allow direct connection to 50

Ω test

equipment. The EV kit also has pads on the serial data

and clock outputs (SDO±, SCLKO±) to allow on-board

termination

for

coupling

to

high-impedance

oscilloscopes.

Quick Start (MAX3872 & MAX3874)

This procedure will set up the evaluation board for

2.48832Gbps normal operation mode, with input

threshold adjust disabled.

1) Place a shunt across pins 2 (SIS) and 3 (GND) of

J13.

2) Place a shunt across pins 1 (VCC) and 2 (LREF)

of J14.

3) Place a shunt across pins 2 and 3 of J15.

4) Place a shunt across pins 2 (RS1) and 3 (GND) of

J17.

5) Place a shunt across pins 2 (RS2) and 3 (GND) of

J18.

6) Place a shunt across pins 2 (RATESET) and 3

(GND) of J19.

7) Place a shunt across pins 1 (VCC) and 2 (VCTRL)

of J9.

8) Remove the shunt from J10.

9) Place a shunt across pins 2 (FREFSET) and 3

(GND) of J12.

10) Connect a 2.48832Gbps PRBS NRZ signal to the

serial data inputs (SDI±) with 50

Ω cables. Leave

the SLBI

± inputs unconnected.

11) Connect the serial data and clock outputs (SDO±,

SCLKO±) to a 50

Ω high-speed oscilloscope.

Terminate any unused outputs with 50

Ω to GND.

12) Connect +3.3V to J20 (VCC) and ground to J21

(GND).

Jitter analysis and product performance can also be

observed by appropriately interfacing the EV kit with a

bit-error-rate tester (BERT) and a jitter analyzer.

Operational Modes

The

MAX3872/MAX3874

has

three

modes

of

operation: normal, system loopback, and clock

holdover.

The

three

operational

modes

are

programmed by connecting the appropriate pins of

JU13 (SIS) and JU14 (LREF). See Table 1. Normal

operation mode requires a serial data stream at the

SDI

± inputs, system loopback mode requires a serial

data stream at the SLBI

± inputs, and clock holdover

mode requires a reference clock signal at the SLBI

±

inputs.

Normal and System

Normal and System Loopback Settings

Loopback Settings

Three jumpers (RS1, RS2, RATESET) are available for

setting the SDI

± or SLBI± inputs to receive the

appropriate data rate (Table 2). The FREFSET pin can

be set high or low while in normal or system loopback

mode.

Clock Frequencies in Holdover Mode

Set the incoming reference clock frequency and

outgoing serial clock frequency by setting RS1, RS2,

RATESET, and FREFSET appropriately. See Table 3.

Auto Switch to Clock Holdover Mode

To switch from normal mode to clock holdover mode

automatically when there are no data transitions

applied to the SDI

± inputs connect LOL directly to

LREF by placing a shunt across pins 1 and 2 of J15.

Vertical Threshold Adjustment

To compensate for optical noise presented on the data

logic high caused by EDFAs in a WDM transmission

system, an external analog control input is provided for

adjusting the data decision threshold to an optimum

level.

To enable data decision threshold adjustment, place a

shunt across pins 2 and 3 of J9 and shunt pins 1 and 2

of J10. Set the decision threshold by adjusting the

potentiometer R8. The center point for the decision

threshold is 1.2V at the VCTRL pin.

Jumpers, Controls, Test Points

Table 4 summarises the functions of all jumpers,

controls, and test points of the MAX3872/MAX3874 EV

Kit.

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