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SY88913 Datasheet

  • SY88913

  • 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER

  • 8頁

  • MICREL   MICREL

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1.25Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
SY88913
FEATURES
s
Up to 1.25Gbps operation
s
Low noise
s
Chatter-Free /LOS Generation
s
PECL /LOS Output
s
TTL /EN Input
s
Differential PECL inputs for data
s
/EN input is TTL with internal 27K pull up
s
Single power supply
s
Designed for use with SY88902 and SY88904
s
Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88913 limiting post amplifier with its high gain
and wide bandwidth is ideal for use as a post amplifier in
fiber-optic receivers with data rates up to 1.25Gbps.
Signals as small as 5mVp-p can be amplified to drive
devices with PECL inputs. The SY88913 generates a
chatter-free PECL Loss of Signal (/LOS).
The SY88913 incorporates a programmble level detect
function to identify when the input signal has been lost.
This information can be fed back to the /EN input of the
device to maintain stability under loss of signal conditions.
Using LOS
LVL
pin the sensitivity of the level detect can
be adjusted. The LOS
LVL
voltage can be set by
connecting a resistor divider between V
CC
and V
REF
,
Figure 2. Figure 3 shows the relationship between input
level sensitivity and the voltage set on LOS
LVL
. Figure 4
shows the relationship between input level sensitivity and
resistor divider ratio.
PIN CONFIGURATION
/EN 1
D
IN
2
/D
IN
3
V
REF
4
LOS
LVL
5
MSOP
K10-1
10 V
CC
9 D
OUT
8 /D
OUT
7
6
/LOS
GND
APPLICATIONS
s
s
s
s
1.25Gbps Gigabit Ethernet
531Mbps and 1062Mbps Fibre Channel
622Mbps SONET
Gigabit Interface Converter
BLOCK DIAGRAM
D
IN
Limiting
Amplifier
ECL
Buffer
D
OUT
D
OUT
D
IN
V
REF
Enable
EN
V
CC
Level
Detect
GND
LOS
LVL
LOS
Rev.: E
Amendment: /1
1
Issue Date: July 2000

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