SY88315BL

3.3V, 3.2Gbps CML Low-Power Limiting

Post Amplifier w/TTL Signal Detect

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

February 2007

M9999-021207-D

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

General Description

The SY88315BL 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

significant amounts of noise and may vary in amplitude

over time. The SY88315BL quantizes these signals and

outputs CML level waveforms.

The SY88315BL operates from a single +3.3V +10%

power supply, over temperatures ranging from –40

+85

can be amplified to drive devices with CML inputs or AC-

coupled CML/PECL inputs.

The SY88315BL generates a signal-detect (SD) open-

collector TTL output. A programmable signal-detect level

detection. SD asserts high if the input amplitude rises

otherwise. The enable input (EN) de-asserts the true

output signal without removing the input signal. The SD

output can be fed back to the EN input to maintain

output stability under loss-of-signal condition. Typically,

3.4dB SD hysteresis is provided to prevent chattering.

Datasheet and support documentation cab be found on

Micrel’s web site at: www.micrel.com.

Features

• Single 3.3V power supply

• DC to 3.2Gbps operation

• Low-noise CML data outputs

• Chatter-free Open-Collector TTL signal detect (SD)

output with internal 4.75k

Ω pull-up resistor

• TTL EN input

• Internal 50

Ω input termination

• Programmable SD level set (SD

• Ideal for multi-rate applications

• Available in a tiny 10-pin EPAD MSOP and 16-pin

QFN package

Applications

• APON/BPON, EPON, and GPON

• Gigabit Ethernet

• Fibre Channel

• OC-3 and OC-12/24 SONET/SDH

• High-gain line driver and line receiver

Markets

• FTTP

• Optical transceivers

• Datacom/telecom

• Low-gain TIA interface