Instrukcja obsługi Microchip SY88903AL


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SY88903AL
3.3V, Burst Mode 1.25Gbps PECL High-
Sensitivity Limiting Post Amplifier with TTL
Loss-of-Signal
February 2007
1 M9999-021707-D
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88903AL, burst mode, high-sensitivity limiting
post amplifier is designed for use in fiber-optic receivers,
specially optimized for passive optical networks (PONs).
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 SY88903AL quantizes these
signals and outputs PECL level waveforms.
The SY88903AL operates from a single +3.3V power
supply, over temperatures ranging from –40
o
C to +85
o
C.
Signals with data rates from 622Mbps up to 1.25Gbps,
and as small as 5mV
pp
, can be amplified to drive
devices with PECL inputs.
The SY88903AL generates a Loss-of-Signal (LOS)
open-collector TTL output. A programmable Loss-of-
Signal level set pin (LOS
LVL
) sets the sensitivity of the
input amplitude detection. LOS asserts high if the input
amplitude falls below the threshold set by LOS
LVL
and
de-asserts low otherwise. The enable bar input (/EN)
de-asserts the true output signal without removing the
input signal. The LOS output can be fed back to the /EN
input to maintain output stability under a loss-of-signal
condition. Typically, 3.4dB LOS hysteresis is provided to
prevent chattering.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
Single 3.3V power supply
Fast LOS release/assert (<500ns) time for PON
applications
622Mbps to 1.25Gbps operation
Low-noise PECL data outputs
High gain LOS
Chatter-free Open-Collector TTL signal detect (LOS)
output with internal 4.75k pull-up resistor
TTL /EN input
Programmable LOS level set (LOS
LVL
)
Available in a tiny 10-pin MSOP package
Applications
GPON/GEPON/EPON
Gigabit Ethernet, 1062Mbps Fibre Channel
OC-12/24 SONET/SDH
Low-gain TIA interface
High-gain line driver and line receiver
Markets
FTTH/FTTP
Datacom/telecom
Optical transceiver
Micrel, Inc. SY88903AL
February 2007
2 M9999-021707-D
hbwhelp@micrel.com or (408) 955-1690
Typical Application Circuit
Micrel, Inc. SY88903AL
February 2007
3 M9999-021707-D
hbwhelp@micrel.com or (408) 955-1690
Ordering Information
Part Number Package
Type
Operating
Range
Package Marking Lead
Finish
SY88903ALKG K10-1 Industrial 903A with Pb-Free bar line indicator NiPdAu
Pb-Free
SY88903ALKGTR
(1)
K10-1 Industrial 903A with Pb-Free bar line indicator NiPdAu
Pb-Free
Note:
1. Tape and Reel.
Pin Configuration
10-Pin MSOP (K10-1)
Pin Description
Pin Number Pin Name Type Pin Function
1 /EN TTL Input: Default is
HIGH.
/Enable: This input enables the outputs when it is LOW. Note
that this input is internally connected to a 25k pull-up resistor
and will default to a logic HIGH state if left open.
2 DIN Data Input True data input.
3 /DIN Data Input Complementary data input.
4 VREF Reference voltage: Placing a capacitor here to V
CC
helps
stabilize LOS
LVL
.
5 LOSLVL Input Loss-of-Signal Level Set: a resistor from this pin to V
CC
sets the
threshold for the data input amplitude at which LOS will be
asserted.
6 GND Ground Device ground.
7 LOS Open-collector TTL
output w/internal 4.75k
pull-up resistor
Loss-of-Signal: asserts high when the data input amplitude falls
below the threshold set by LOS
LVL
.
8 /DOUT PECL Output Complementary data output.
9 DOUT PECL Output True data output.
10 VCC Power Supply Positive power supply.


Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY88903AL

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