SY88953L Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V 10.7Gbps CML LIMITING POST AMPLIFIER W/ TTL SD AND /SD

Micrel, Inc.
3.3V 10.7Gbps CML LIMITING POST
AMPLIFIER W/ TTL SD AND /SD
SY88953L
SY88953L
FEATURES
DESCRIPTION
■ Single 3.3V power supply
■ Up to 10.7Gbps operation
■ 800mVp-p output swing with 30ps edge rates
■ 28dB voltage gain with 5mVp-p input sensitivity
■ On chip 50Ω I/O termination
■ Programmable signal detect (SD and /SD) with 6dB
hysteresis
■ Chatter-free OC-TTL SD and /SD outputs with internal
5kΩ pull-up resistors can feedback to TTL enable
(/EN) input
■ Available in a tiny (3mm × 3mm) 16-pin MLF^®
package or die
APPLICATIONS
■ OC-192 SDH/SONET
■ 10G Ethernet/Fibre Channel receivers
■ Upto 10.7Gbps proprietary link
■ XFP transceivers
■ Line driver/receiver
The SY88953L high-speed 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 SY88953L quantizes
these signals and outputs CML level waveforms.
The SY88953L operates from a single +3.3V power supply,
over temperatures ranging from –40°C to +85°C. With its
wide bandwidth and high gain, signals with data rates up to
10.7Gbps and as small as 5mVp-p can be amplified to drive
devices with CML inputs.
The SY88953L outputs TTL signal-detect (SD and /SD)
signals. 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 deasserts low otherwise. /SD is the complementary
output of SD. /SD can be fedback to the enable (/EN) input
to maintain output stability under a loss of signal condition.
/EN deasserts the true output signal without removing the
input signal. Typically 6dB SD hysteresis is provided to
prevent chattering.
The SY88953L also includes an input threshold
adjustment to correct pulsewidth distortion.
TYPICAL APPLICATIONS CIRCUIT
0.1µF
From
Transimpedance
Amp.
0.1µF
SD
V_THP
/SD
V_CC
/EN
D_IN
/D_IN
V_THN
SY88953L
SD_LVL
GND V_CC
200kΩ
D_OUT
/D_OUT
0.1µF
0.1µF
To
CDR
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
M9999-081506
[e-mail] or [phone]
1
Rev.: C Amendment: /0
Issue Date: August 2006