SY88289AL
3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier with TTL Loss-of-Signal
General Description
Features
The SY88289AL low-power limiting post amplifier is • Single 3.3V power supply designed for use in fiber-optic receivers. The device • 125Mbps to 3.2Gbps operation connects to typical transimpedance amplifiers (TIAs). • Low-noise CML data outputs The linear signal output from TIAs can contain • Chatter-free open-collector TTL Loss-of-signal (LOS) significant amounts of noise and may vary in amplitude output with internal 4.75kΩ pull-up resistor over time. The SY88289AL quantizes these signals and • TTL /EN input outputs CML-level waveforms. • Internal 50Ω input termination The SY88289AL operates from a single +3.3V power supply, over temperatures ranging from –40oC to +85oC. • Programmable LOS level set (LOSLVL) With its wide bandwidth and high gain, signals with data • Ideal for multi-rate applications rates up to 3.2Gbps, and as small as 10mVP-P, can be • Available in a tiny 3mmx3mm 16-pin MLF® package amplified to drive devices with CML inputs or ACcoupled CML/PECL inputs. Applications The SY88289AL generates a loss-of-signal (LOS) open• APON, BPON, EPON, GEPON, and GPON collector TTL output. A programmable loss-of-signal • Gigabit Ethernet level-set pin (LOSLVL) sets the sensitivity of the input • Fibre Channel amplitude detection. LOS asserts high if the input • SONET/SDH:OC-3/12/24/48 – STM 1/4/8/16 amplitude falls below the threshold set by LOSLVL and www.DataSheet4U.com de-asserts low otherwise. The enable bar input (/EN) • High-gain line driver and line receiver de-asserts the true output signal without removing the Markets input signal. The LOS output can be fed back to the /EN input to maintain output stability under a loss-of-signal • Optical transceivers condition. Typically, 3.5dB LOS hysteresis is provided to • Datacom/telecom prevent chattering. All support documentation can be found on Micrel’s web site at www.micrel.com.
Typical Application
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. 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-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY88289AL
Ordering Information
Part Number SY88289ALMG SY88289ALMGTR(1) Note: 1. Tape and Reel. Package Type MLF-16 MLF-16 Operating Range Industrial Industrial Package Marking 289A with Pb-Free bar line indicator 289A with Pb-Free bar line indicator Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free
Pin Configuration
16-Pin MLF® (MLF-16)
Pin Description
Pin Number 1, 12 2 3 4, 9 5 6 Pin Name VCC DIN /DIN GND VREF LOSLVL Input Type Power Supply Data Input Data Input Ground Positive power supply. True data input. Complementary data input. Device ground. Reference voltage: Placing a capacitor here to VCC helps stabilize LOSLVL. Loss-of-signal Level Set: a resistor from this pin to VCC sets the thr.