Microchip SY88813V Handleiding

Microchip Niet gecategoriseerd SY88813V

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M9999-040504

hbwhelp@micrel.com or (408) 955-1690

DESCRIPTION

The SY88813V features:

■Single 3.3V or 5V power supply

■Up to 155Mbps operation

■Low noise PECL data outputs

■Chatter-free PECL Signal Detect (SD) output

■TTL /EN input

■Programmable SD level set (SD LVL)

■Available in a tiny 10-pin MSOP (3mm ××××

×3mm)

package

The SY88813V evaluation board features:

■AC-coupled I/O with SMA connectors

■Single potentiometer to set SD LVL

■50Ω input network termination

FUNCTIONAL FEATURES

3.3V/5V 155Mbps PECL LOW-POWER

LIMITING POST AMPLIFIER

W/PECL SIGNAL DETECT

SY88813V

EVALUATION BOARD

AVAILABLE MEASUREMENTS

The SY88813V evaluation board allows the following

measurements:

■Frequency performance

■Output eye pattern generation

■Mask testing

■Jitter

■Output rise/fall time

■BER testing

■Hysteresis measurement

Rev.: A Amendment: /0

Issue Date: April 2004

The SY88813V low-power limiting post amplifier is

designed for use in fiber-optic receivers. The device connects

to typical transimpedance amplifiers (TIAs). The linear signal

output from TIAs can contain signicant amounts of noise

and may vary in amplitude over time. The SY88813V

quantizes these signals and outputs PECL level waveforms.

The SY88813V operates from a single +3.3V 10% or±

+5V ±10% power supply, over temperatures ranging from

–40°C to +85°C. With its wide bandwidth and high gain,

signals with data rates up to 155Mbps and as small as

5mVpp can be amplified to drive devices with PECL inputs.

The SY88813V generates a PECL signal-detect output.

A programmable signal-detect level set pin (SDLVL) sets

the sensitivity of the input amplitude detection. SD asserts

high if the input amplitude rises above the threshold set by

SDLVL and deasserts low otherwise. /EN deasserts the true

output signal without removing the input signal. Typically

4.6dB SD hysteresis is provided to prevent chattering.

This manual provides information on the SY88813V

evaluation board. It should be used in conjunction with the

SY88813V datasheet, which contains full specications of

the SY88813V.

The SY88813V evaluation board enables fast and

thorough evaluation of the SY88813V 155Mbps PECL low-

power limiting post amplier. The board is an easy-to-use,

single-layer high-speed microstrip design. It is designed to

be driven by a high-speed 155Mbps pattern generator and

provides on-board 50 terminations for the generator’sΩ

outputs. The input termination network also provides the

required input bias of VCC–1.3V for the SY88813V.

The SY88813V evaluation board is intended to be

terminated to a 50 scope and provides for simple userΩ

adjustability of the SD threshold through the adjustment of

an on-board potentiometer. This allows the user to evaluate

various parameters of the SY88813V, as listed in the

“Available Measurements” section of this document.

All data sheets and support documentation can be found

on Micrel’s web site at www.micrel.com.

EVALUATION BOARD

Figure 1. SY88813V Evaluation Board

SY88813V Evaluation Board

Micrel

M9999-040504

hbwhelp@micrel.com or (408) 955-1690

MEASUREMENT SETUP

SMA

SMA C2

0.1µF

VCC

20kΩ

Trimpot

50Ω

200Ω

50Ω

SMA

22µF

0.1µF

TRIGGER

OUT

Header Pins J1

BLM21A102F

FB1

Agilent 83752A

Synthesized Sweeper

RFOUT

CLOCK INPUT

DATA OUT

/DATA OUT

Agilent 70004A

Display

Agilent 70843B

Error Performance Analyzer

Agilent E3620A

Power Supply

Tektronix

DMM157

Multimeter

200Ω

/EN

DIN

/DIN

VREF

SDLVL GND

VCC 10

DOUT 9

/DOUT 9

SY88813V

VCC

GND

Agilent 86100A

Wide-Bandwidth Oscilloscope

CH1 CH2

TRIGGER

Figure 2. Setup for Measurements

Equipment used for measurements:

1. Agilent 83752A Synthesized Sweeper

2. Agilent 70004A Display

3. Agilent 70843B Error Performance Analyzer

4. Agilent 86100A Wide-Bandwidth Oscilloscope

5. Two (2) MCL BW S15W2 40dB attenuators

6. Agilent E3620A DC Power Supply

7. Tektronix DMM157 Multimeter

8. Matched High-Speed Cables w/SMA Connectors

Note:

Items 1 through 3 constitute the BERT stack.

SY88813V Evaluation Board

Micrel

M9999-040504

hbwhelp@micrel.com or (408) 955-1690

SETUP FOR MEASUREMENTS

This section explains how to connect and setup the

SY88813V evaluation board per Figure 2. Ensure proper

ESD precautionary measures are taken before handling

sensitive electronic equipment, including the SY88813V

evaluation board.

1. Set E3620A to output 3.3V and then turn o

E3620A. Connect E3620A s positive lead to V’CC

post, negative lead to GND post.

2. Configure Agilent BERT stack:

a) Set the 83752A Synthesized Sweeper to

155MHz.

b) From the 70004A’s Pattern menu, choose the

PRBS 231–1 pattern.

c) From the 70004A’s Trigger menu:

i. Choose clock as trigger output

ii. Choose CLK/8 for divider

d) From the 70004A’s Data menu:

i. External termination = DC termination 0V

ii. Attenuation = 40dB

iii. Amplitude = 5mV (10mVpp)

iv. Hi-Level = 0V

v. Tracking = ON

vi. Polarity = NORMAL

vii. Data Output = ON

viii. Crossing = 0

3. Connect 70843V’ ’s trigger output to 86100A s

trigger input.

4. Use J1 to short /EN to GND on SY88803V evalua-

tion board.

5. Connect DIN and /DIN on SY88813V evaluation

board to 70843V s data outputs through 40dB’

attenuators.

a) Connect 40dB attenuators directly to the board

rather than the 70843V s data outputs to allow’

a larger and cleaner signal to pass through the

connecting SMA cables.

6. Connect DOUT and /DOUT on SY88813V evalua-

tion board to 86100A s inputs.’

7. Set DMM157 to display voltage. Connect positive

lead to SD header on J1 and connect negative lead

to VCC.

8. Turn on E3620A. Typical power supply current

should be ~45mA, including the SY88813V’s

current and current through the on-board 200Ω

output pulldown resistors at 3.3V supply voltage.

Excessive current usually means the power supply

leads have been connected backwards. Be careful

of this!

9. Configure 86100A oscilloscope.

a) Verify a trigger signal is present by checking

that the Trigger Source button is lit.

i. Depress this button to choose external

source if necessary.

ii. Adjust trigger level if necessary.

b) Press Eye/Mask Mode on front panel.

c) Choose NRZ Eye Measurements from on-

screen display.

d) Choose RMS Jitter, Rise Time, Fall Time and

Eye Amplitude measurements from on-screen

selection list.

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	SY88813V

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