Microchip SY88932L Manual

Microchip Ikke kategoriseret SY88932L

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Side 1/6

DESCRIPTION

■Up to 3.2Gbps operation

■Modulation current to 60mA

■50Ω input termination

■Rise/fall times < 70ps

■Programmable laser modulation voltage

■Operating temperature range: –40°C to +85°C

■Available in tiny 16-pin (3mm ××

××

× 3mm) MLF™ package

FEATURES

3.3V 3.2Gbps SONET/SDH

LASER DRIVER WITH 50Ω

INPUT TERMINATION

SY88932L

EVALUATION BOARD

Rev.: A Amendment: /0

Issue Date: October 2002

The SY88932L 3.3V SONET laser driver is the smallest

laser driver with programmable modulation current used for

applications up to 3.2Gbps. The device accepts either PECL

or CML level data inputs. The SY88932L provides

modulation voltage/current of up to 60mA for FP (Fabry-

Perot) or DFB (Distribution Feedback) lasers. There is a

75kΩ pull-down resistor to VEE at the input of /EN. An

active TTL enable signal shuts o the modulation current.

This document provides design and implementation

information, as well as, a detailed description of the

SY88932L evaluation board. The evaluation board is AC-

coupled, and has both dierential inputs and outputs, and

a resistor port to vary the modulation voltage.

TEST SET-UP FOR EVALUATION BOARD

Figure 1. Test Set-Up for the SY88932L Evaluation Board

MLF and

Micro

LeadFrame are trademarks of Amkor Technology, Inc.

SY88932L Evaluation Board

Micrel

Functional Description

The evaluation board for the SY88932L is AC-coupled

and is meant to show the AC-performance of the part in

terms of IMOD vs. trise, tfall, RMS jitter, and eye diagram. In

addition, since the evaluation board is AC-coupled, no laser

can be mounted. Further, biasing of the board does not

require complex split power supplies and requires only a

single-dual power source.

Note, however, that the output level is inverted, meaning

that a high signal input generates a low signal output,

likewise, a low signal input generates a high signal output.

Further, the modulation current IMOD varies linearly with the

modulation voltage VCNTRL. See Figure 8 IMOD vs. VCNTRL.

Power Supply

The SY88932L is a +3.3V device, therefore, V CC or Jack

2 should be connected to +3.3V, and GND or Jack 1 should

be connected to 0V.

Board Layout and Design

The evaluation board is fabricated using standard FR-4

dielectric material, using coplanar transmission line structure

and has been designed to minimize crosstalk, noise, and

achieve high bandwidth.

Layer 1 Signal Zo = 50Ω/GND

Layer 2 Impedance GND

Layer 3 VCC

Layer 4 GND

Table 1. Layer Stack

Pin Function

DIN, /DIN CML/PECL, Internal 50 termination, NRZ Data.Ω

/EN TTL Compatible Input.

GND Ground.

OUT, /OUT Open Collector Output Signal AC–Coupled with

33Ω to VCC.

VCC Power Supply.

TP1, TP2 Connected if you chose to use V

REF as source for

VCNTRL pin.

R3 Variable Resistor Pot to Control VCNTRL, and IMOD.

Table 2. Evaluation Board Signal Inputs and Outputs

Note 1:

PECL Operation:

Typical voltage swing is 700mV to 800mV into

50Ω. In addition, common mode voltage for PECL is V

CC –1.3V.

Note 2:

CML Operation:

Typical voltage swing is V

CC to V CC –400mV or

400mV.

Test Description

This section contains step-by-step instructions for

evaluating the SY88932L in terms of AC and DC

performance. AC performance being trise, t

fall , RMS jitter,

and eye-diagram generation. DC performance being, I MOD

vs. VMOD linearity.

Equipment used for measurement

•Agilent E3620A dual output DC power supply

•Tektronix 11801 digital sampling oscilloscope

•Agilent 83752A Synthesized Sweeper

•HP7000A display

•Agilent 70843B error performance analyzer

•Matched high-speed cables w/SMA connectors

•SY88932L evaluation board

1. Connect VCC to Jack 2 to +3.3V and connect

GND or Jack 1 to ground.

2. Connect TP1 to a power source as shown in

Figure 1, Test Set-Up for for the SY88932L.

3. Using an Agilent 83752A Synthesized Sweeper,

set the frequency, and choose PRBS 223–1 with

FM mode o.

4. Connect DOUT, and /DOUT of the Agilent 70843B

to drive SMA1 and SMA2, DIN

and /DIN, of the

SY88932L evaluation board. Then connect the

trigger out to the trigger input of the Tektronix

11801B digital sampling oscilloscope.

SET-UP FOR MEASUREMENTS

5. Next, connect SMA3 and SMA4 which are the

outputs of the evaluation board to Tektronix

11801B's CH1 and CH2 inputs.

6. By varying the modulation current and voltage, a

set of AC measurements such Table 3, IMOD vs.

trise, tfall, and jitter can be generated.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SY88932L

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