Micrel, Inc.
3.3V/5V 155Mbps PECL LOW POWER
LIMITING POST AMPLIFIER WITH PECL
SIGNAL DETECT
DESCRIPTION
SY88813V
SY88813V
FEATURES
s
Single 3.3V or 5V power supply
s
Up to 155Mbps operation
s
Low noise PECL data outputs
s
Chatter-free PECL Signal Detect (SD) output
s
TTL /EN input
s
Programmable SD level set (SD
LVL
)
s
Available in a tiny 10-pin MSOP (3mm) package
The SY88813V 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 SY88813V
quantizes these signals and outputs PECL level waveforms.
The SY88813V operates from a single +3.3V or +5V
power supply, over temperatures ranging from 鈥?0掳C to
+85掳C. With its wide bandwidth and high gain, signals with
data rates up to 155Mbps and as small as 5mV
PP
can be
amplified to drive devices with PECL inputs.
The SY88813V generates a PECL signal-detect 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 deasserts low otherwise. /EN deasserts the true
output signal without removing the input signal. Typically
4.6dB SD hysteresis is provided to prevent chattering.
APPLICATIONS
s
155Mbps SONET/SDH
s
Small form factor transceivers
s
High-gain line driver and line receiver
TYPICAL APPLICATIONS CIRCUIT
R
pd
V
CC
SD
From
Transimpedance
Amp.
0.1碌F
0.1碌F
50鈩?/div>
D
IN
/D
IN
50鈩?/div>
/EN
D
OUT
0.1碌F
0.1碌F
R
pd
SY88813V
SD
LVL
V
CC
V
REF
/D
OUT
R
pd
To
CDR
GND
100鈩?/div>
3k鈩?/div>
GND
For 3.3V, R
pd
= 120鈩?/div>
For 5V, R
pd
= 220鈩?/div>
M9999-072505
hbwhelp@micrel.com or (408) 955-1690
Rev.: B
Amendment: /0
1
Issue Date: July 2005
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