SY88313BL_10 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Low-Power Limiting Post

SY88313BL
3.3V, 3.2Gbps CML Low-Power Limiting Post
Amplifier with TTL Loss-of-Signal
General Description
Features
The SY88313BL 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 SY88313BL quantizes these signals and
outputs CML-level waveforms.
The SY88313BL operates from a single +3.3V ±10%
supply, over temperatures ranging from –40°C to +85°C.
With its wide bandwidth and high gain, signals with data
rates up to 3.2Gbps, and as small as 10mV_PP, can be
amplified to drive devices with CML inputs or AC-
coupled CML/PECL inputs.
The SY88313BL generates a loss-of-signal (LOS) open-
collector TTL output. A programmable loss-of-signal
level set pin (LOSLVL) sets the sensitivity of the input
amplitude detection. LOS asserts high if the input
amplitude falls below the threshold set by LOSLVL and
de-asserts low otherwise. The enable bar input (/EN)
de-asserts the true output signal without removing the
input signal. The LOS output can be fed back to the /EN
input to maintain output stability under a loss-of-signal
condition. Typically, 3.4dB LOS hysteresis is provided to
prevent chattering.
Datasheet and support documentation cab be found on
Micrel’s web site at: www.micrel.com.
• Single 3.3V power supply
• DC to 3.2Gbps operation
• Low-noise CML data outputs
• Chatter-free Open-Collector TTL loss-of-signal
(LOS) output with internal 4.75kΩ pull-up
resistor
• TTL /EN input
• Internal 50Ω input termination
• Programmable LOS level set (LOSLVL)
• Ideal for multi-rate applications
• Available in a tiny 10-pin EPAD MSOP and
16-pin QFN package
Applications
• APON/BPON, GEPON, EPON, and GPON
• Gigabit Ethernet
• Fibre Channel
• OC-3/12/24/48 SONET/SDH
• High-gain line driver and line receiver
• Low-gain TIA interface
Markets
• FTTP/FTTH
• Datacom/Telecom
• Optical Transceivers
_______________________________________________________________________________________________________
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2007
M9999-021207-B
[e-mail] or [phone]