Micrel, Inc.
3.3V/5V 622Mbps PECL LOW-POWER
LIMITING POST AMPLIFIER W/PECL
SIGNAL DETECT
DESCRIPTION
SY88713V
SY88713V
FEATURES
s
Single 3.3V or 5V power supply
s
Up to 622Mbps 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 SY88713V 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 SY88713V
quantizes these signals and outputs PECL level waveforms.
The SY88713V operates from a single +3.3V or +5V
power supply, over temperatures ranging from 鈥?0擄C to
+85擄C. With its wide bandwidth and high gain, signals with
data rates up to 622Mbps and as small as 5mVp-p can be
amplified to drive devices with PECL inputs.
The SY88713V generates a PECL SD 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
622Mbps SONET/SDH
s
Small form factor transceivers
s
High-gain line driver and line receiver
TYPICAL APPLICATIONS CIRCUIT
120鈩?/div>
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
SY88713V
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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