Microchip SY88932L Handleiding

Microchip Niet gecategoriseerd SY88932L

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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
1
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.
2
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.
3
SY88932L Evaluation Board
Micrel
Figures 2 through Figure 7, illustrates the output
waveforms of the SY88932L at dierent data rates and
dierent IMOD current.
TIME (500ps/div.)
(20mV/div.)
Figure 2. Output Waveform
(750Mbps w/IMOD ~ 10mA, +3.3V)
TIME (50ps/div.)
(20mV/div.)
Figure 3. Output Waveform
(3.2Gbps w/IMOD ~ 10mA, +3.3V)
VCC = +3.0V VCC = +3.3V V
CC = +3.6V
IMOD TA = –40°C TA = +85°C TA = +25°C TA = –40°C TA = +85°C
Unit (mA) tr(ps) tf(ps) Jitter(RMS) t
r(ps) tf(ps) Jitter(RMS) tr(ps) tf(ps) Jitter (RMS) tr(ps) tf(ps) Jitter (RMS) t
r(ps) tf(ps) Jitter (RMS)
10 46.2 43.2 2.46 49.2 41.2 2.31 46.5 40.8 2.44 46.2 41.1 2.5 47.9 39.3 2.55
1 30 53.3 55.8 2.5 56.2 53.6 2.62 56 55 2.45 55 53.3 2.34 59.1 53.2 3.12
50 60.7 72.4 3.73 62.2 90.4 8.33 63.6 72.2 7.18 62.7 67 2.26 63.4 72.1 7.06
Table 3. AC Parameters
OUTPUT WAVEFORM MEASUREMENTS
TIME (500ps/div.)
(100mV/div.)
Figure 4. Output Waveform
(750Mbps w/IMOD ~ 30mA, +3.3V)
TIME (50ps/div.)
(100mV/div.)
Figure 5. Output Waveform
(3.2Gbps w/IMOD ~ 30mA, +3.3V)

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY88932L

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