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SY88922KCTR Datasheet

  • SY88922KCTR

  • SDH/SONET 2.5Gbps LASER DIODE DRIVER

  • 8頁

  • MICREL   MICREL

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SDH/SONET 2.5Gbps
LASER DIODE DRIVER
SY88922
FEATURES
s
Up to 2.5Gbps operation
s
25mA peak drive current
s
Separate modulation control
s
Separate output enable for laser safety
s
Differential inputs for data
s
75K
鈩?/div>
input pulldown resistor
s
Designed for use with SY88923, SY88904 or SY88905
s
Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88922 is a high-speed current switch for driving
a semiconductor laser diode in optical transmission
applications. The output current, or modulation current
I
MOD
, is DC current controlled by I
RSET
, current through
the resistor R
SET
. The output OUT is HIGH when output
enable is HIGH.
The device incorporates complementary open collector
outputs with a capability of driving peak current of 25mA.
The resistor R
EXT
must be placed between /OUT and
V
CC
to dissipate the worst case power. R
SER
is
recommended to compensate for laser diode matching
issues.
The SY88922 utilizes the high performance bipolar
ASSET鈩?technology.
PIN CONFIGURATIONS
/EN 1
D
IN
2
/D
IN
3
V
REF
4
R
SET
5
MSOP
K10-1
10 V
CC
9 OUT
8 /OUT
7 GND
6 GND
APPLICATIONS
s
1.25Gbps Gigabit Ethernet
s
s
s
s
531Mbps and 1062Mbps Fibre Channel
622Mbps SONET
Gigabit Interface Converter
2.5Gb/s SDH/SONET
BLOCK DIAGRAM
V
CC
R
EXT
OUT
OUT
R
SER
D
IN
D
IN
I
MOD
EN
BIAS
Control
Internal Logic
to Laser Diode
40X
V
CC
GND
GND
R
SET
Modulation Control
V
REF
R
SET
Rev.: B
Amendment: /1
1
Issue Date: July 2000

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