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PDF SY88289CL Data sheet ( Hoja de datos )
| Número de pieza | SY88289CL | |
| Descripción | CML Limiting Post Amplifier | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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SY88289CL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High-Gain TTL Loss-of-Signal
General Description
Features
The SY88289CL low-power, high-sensitivity, 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 SY88289CL quantizes these
signals and outputs CML-level waveforms.
• Single 3.3V power supply
• 125Mbps to 3.2Gbps operation
• Low-noise CML data outputs
• High-gain LOS
• Chatter-free open-collector TTL Loss-of-Signal (LOS)
output with an internal 4.75kΩ pull-up resistor
The SY88289CL operates from a single +3.3V power
supply, over temperatures ranging from –40oC to +85oC.
With its wide bandwidth and high gain, signals with data
rates up to 3.2Gbps and as small as 5mVPP can be
amplified to drive devices with CML inputs or AC-
coupled CML/PECL inputs.
• TTL /EN input
• Programmable LOS level set (LOSLVL)
• Ideal for multi-rate applications
• Available in a tiny (3mm x 3mm) 16-pin MLF®
package
The SY88289CL generates a high-gain loss-of-signal Applications
(LOS) open-collector TTL output. This function has a
high-gain input stage for increased LOS sensitivity. A
programmable loss-of-signal level-set pin (LOSLVL) sets
the sensitivity of the input amplitude detection. LOS
• APON, BPON, EPON, GEPON and GPON
• Gigabit Ethernet
• 1X and 2X Fibre Channel
asserts high if the input amplitude falls below wwthw.eDataSheet•4U.comSONET/SDH : OC 3/12/24/48 – STM 1/4/8/16
threshold sets by LOSLVL and de-asserts low otherwise.
The enable bar input (/EN) de-asserts the true output
signal without removing the input signal. The LOS
• High-gain line driver and line receiver
• Low-gain TIA interface
output can be fed back to the /EN input to maintain Markets
output stability under a loss-of-signal condition.
Typically, 3.5dB LOS hysteresis is provided to prevent
chattering.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
• FTTP/FTTH
• Optical transceivers
• Datacom/Telecom
• Long reach FOM
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2007
M9999-021207-B
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SY88289CL
AC Electrical Characteristics
VCC = 3.0V to 3.6V; RL = 50Ω to VCC; TA = –40°C to +85°C.
Symbol
Parameter
Condition
tr, tf Output Rise/Fall Time
(20% to 80%)
Note 4
tJITTER
Deterministic
Random
Note 5
Note 6
VID
VOD
TOFF
TON
LOSAL
LOSDL
HYSL
LOSAM
LOSDM
HYSM
LOSAH
LOSDH
HYSH
B-3dB
AV(Diff)
S21
Differential Input Voltage Swing
Differential Output Voltage Swing
LOS Release Time
LOS Assert Time
Low LOS Assert Level
Low LOS De-assert Level
Low LOS Hysteresis
Medium LOS Assert Level
Medium LOS De-assert Level
Medium LOS Hysteresis
High LOS Assert Level
High LOS De-assert Level
High LOS Hysteresis
3dB Bandwidth
Differential Voltage Gain
Single-ended Small-Signal Gain
Figure 1
VID > 12mVPP, Figure 1
RLOSLVL = 15kΩ, Note 8
RLOSLVL = 15kΩ, Note 8
RLOSLVL = 15kΩ, Note 7
RLOSLVL = 5kΩ, Note 8
RLOSLVL = 5kΩ, Note 8
RLOSLVL = 5kΩ, Note 7
RLOSLVL = 100Ω, Note 8
RLOSLVL = 100Ω, Note 8
RLOSLVL = 100Ω, Note 7
Min Typ Max Units
60 120
ps
15 psPP
5 psRMS
5
1800
mVPP
700 800 950 mVPP
2 10 µs
2 10 µs
3 mVPP
4.5 mVPP
3.5 dB
25
mVPP
7.5 11 mVPP
2 3.5 4.5
dB
8 12
mVPP
18 23 mVPP
2 3.5 4.5
dB
2 GHz
32 38
dB
26 32
dB
Notes:
4. Amplifier in limiting mode. Input is a 200MHz square wave.
5. Deterministic jitter measured using 3.2Gbps K28.5 pattern, VID = 10mVPP.
6. Random jitter measured using 3.2Gbps K28.7 pattern, VID = 10mVPP.
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 upon that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2dB-4.5dB, as
shown in the AC characteristics table, will be 1dB-3dB.
8. 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.
February 2007
5 M9999-021207-B
[email protected] or (408) 955-1690
5 Page | ||
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