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PDF SY88903AL Data sheet ( Hoja de datos )
| Número de pieza | SY88903AL | |
| Descripción | PECL High-Sensitivity Limiting Post Amplifier | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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SY88903AL
3.3V, Burst Mode 1.25Gbps PECL High-
Sensitivity Limiting Post Amplifier with TTL
Loss-of-Signal
General Description
Features
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 –40oC to +85oC.
Signals with data rates from 622Mbps up to 1.25Gbps,
and as small as 5mVpp, can be amplified to drive
devices with PECL inputs.
• 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 4.75kΩ pull-up resistor
• TTL /EN input
• Programmable LOS level set (LOSLVL)
• Available in a tiny 10-pin MSOP package
The SY88903AL generates a Loss-of-Signal (LOS)
open-collector TTL output. A programmable Loss-of-
Applications
Signal level set pin (LOSLVL) sets the sensitivity of the • GPON/GEPON/EPON
input amplitude detection. LOS asserts high if the input • Gigabit Ethernet, 1062Mbps Fibre Channel
amplitude
de-asserts
de-asserts
falls
low
the
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input signal. The LOS output can be fed back to the /EN • High-gain line driver and line receiver
input to maintain output stability under a loss-of-signal
condition. Typically, 3.4dB LOS hysteresis is provided to Markets
prevent chattering.
• FTTH/FTTP
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
• Datacom/telecom
• Optical transceiver
February 2007
1 M9999-021707-D
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SY88903AL
AC Electrical Characteristics
VCC = 3.0 to 3.6V; RL = 50Ω to VCC-2V; TA = –40°C to +85°C, typical values at VCC = 3.3V, TA = 25°C.
Symbol Parameter
Condition
Min Typ Max Units
tr, tf Output Rise/Fall Time
(20% to 80%)
Note 3
ps
260
tJITTER
VID
VOD
Deterministic
Random
Differential Input Voltage Swing
Differential Output Voltage
Swing
Note 4
Note 5
See Figure 1
VID > 18mVPP, See Figure 1
15 psPP
5 psRMS
5
1800
mVPP
1500
mVPP
tOFF LOS Release Time
Note 8
40 500 ns
tON
LOSAL
LOS Assert Time
Low LOS Assert Level
Note 8
RLOSLVL = 15kΩ, Note 6
125 500 ns
2.3 mVPP
LOSDL
Low LOS De-assert Level
RLOSLVL = 15kΩ, Note 6
3.4 mVPP
HSYL
Low LOS Hysteresis
RLOSLVL = 15kΩ, Note 7
3.4 dB
LOSAM
Medium LOS Assert Level
RLOSLVL = 5kΩ, Note 6
2 4.2
mVPP
LOSDM
Medium LOS De-assert Level
RLOSLVL = 5kΩ, Note 6
6.2 9 mVPP
HSYM
Medium LOS Hysteresis
RLOSLVL = 5kΩ, Note 7
2 3.4 5 dB
LOSAH
High LOS Assert Level
RLOSLVL = 100Ω, Note 6
8 10.8
mVPP
LOSDH
High LOS De-assert Level
RLOSLVL = 100Ω, Note 6
16.4
21 mVPP
HSYH
High LOS Hysteresis
RLOSLVL = 100Ω, Note 7
2 3.4 5 dB
B-3dB
3dB Bandwidth
1 GHz
AV(Diff)
Differential Voltage Gain
42 dB
S21 Single-Ended Small-Signal Gain
30 36
dB
Notes:
3. Amplifier in limiting mode. Input is a 200MHz square wave.
4. Deterministic jitter measured using 1.25Gbps K28.5 pattern, VID = 10mVPP.
5. Random jitter measured using 1.25Gbps K28.7 pattern, VID = 10mVPP.
6. See “Typical Operating Characteristics” for a graph showing how to choose a particular RLOSLVL for a particular LOS assert and its associated
de-assert amplitude.
7. This specification defines electrical hysteresis as 20log (LOS De-assert/LOS Assert). The ratio between optical hysteresis and electrical
hysteresis is found to vary between 1.5 and 2 depending upon the level of received optical power and ROSA characteristics. Based on that ratio,
the optical hysteresis corresponding to the electrical hysteresis range 1dB-4.5 dB, shown in the AC characteristics table, will be 0.5dB-3dB
Optical Hysteresis.
8. In real world applications, the LOS Release/Assert time can be strongly influenced by the RC time constant of the AC-coupling cap and the 50Ω
input termination. To keep this time low, use a decoupling cap with the lowest value that is allowed by the data rate and the number of
consecutive identical bits in the application (typical values are in the range of 0.001µF to 1.0µF).
February 2007
5 M9999-021707-D
[email protected] or (408) 955-1690
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SY88903AL.PDF ] | |
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