SY88923AVEC データシートの表示（PDF） - Micrel

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SY88923AVEC

5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER

Micrel 

Micrel, Inc.

SY88923AV

GENERAL DESCRIPTION

General

The SY88923AV is an integrated limiting amplifier

intended for high-frequency fiber-optic applications. The

circuit connects to typical trans-impedance amplifiers found

within a fiber-optics link. The linear signal output from a

trans-impedance amplifier can contain significant amounts

of noise, and may vary in amplitude over time. The

SY88923AV limiting amplifier quantizes the signal and

outputs a voltage-limited waveform.

The /EN pin allows the user to disable the output signal

without removing the input signal.

DESIGN PROCEDURE

Output Termination

The SY88923AV outputs must be terminated with a 50Ω

load to VCC – 2V (or Thevenin equivalent).

Layout and PCB Design

Since the SY88923AV is a high-frequency component,

performance can largely be determined by board layout

and design. A common problem with high-gain amplifiers is

feedback from the large swing outputs to the input via the

power supply.

The SY88923AV ground pin should be connected to the

circuit board ground. Use multiple PCB vias close to the

part to connect to ground. Avoid long, inductive runs which

can degrade performance.

VCC

R1

LOSLVL

0.1µF

0.1µF

DIN+

DIN—

R2

VREF

50Ω

50Ω

VREF

VCC 0.1µF

Figure 3. LOSLVL Circuit

Note 1.

LOSLVL = VCC

–1.32V +

R2 × 1.32V

R1 + R2

R1 + R2 ≥ 2.6kΩ

Figure 2. Differential Input Configuration

M9999-110905

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

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