鈩?/div>
pull-up resistor
s
TTL EN input
s
Programmable SD level set (SD
LVL
)
s
Available in a tiny 10-pin MSOP (3mm) package
The SY88933V 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 SY88933V
quantizes these signals and outputs PECL level waveforms.
The SY88933V 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 1.25Gbps and as small as 5mVp-p can be
amplified to drive devices with PECL inputs.
The SY88933V generates a TTL 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
1.25Gbps Ethernet
s
1.55Mbps and 622Mbps SONET/SDH
s
High-gain line driver and line receiver
s
531Mbps and 1062Mbps Fibre Channel
s
Gigabit interface converter
TYPICAL APPLICATIONS CIRCUIT
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
SY88933V
SD
LVL
V
REF
/D
OUT
R
pd
To
CDR
GND
V
CC
100k鈩?/div>
0.1碌F
GND
For 3.3V, R
pd
= 120鈩?/div>
For 5V, R
pd
= 220鈩?/div>
Rev.: A
Amendment: /0
1
Issue Date: May 1, 2003
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