SY88315BL Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier w/TTL Signal Detect

SY88315BL
3.3V, 3.2Gbps CML Low-Power Limiting
Post Amplifier w/TTL Signal Detect
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^oC to
+85^oC. 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 SY88315BL generates a signal-detect (SD) open-
collector TTL output. A programmable signal-detect level
set pin (SD_LVL) sets the sensitivity of the input amplitude
detection. SD asserts high if the input amplitude rises
above the threshold set by SD_LVL and de-asserts low
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 4.75kΩ pull-up resistor
• TTL EN input
• Internal 50Ω input termination
• Programmable SD level set (SD_LVL)
• Ideal for multi-rate applications
• Available in a tiny 10-pin EPAD MSOP and 16-pin
MLF^® 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
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2007
M9999-021207-D
[e-mail] or [phone]