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SY88903 Datasheet

  • SY88903

  • 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER

  • 8頁

  • MICREL   MICREL

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1.25Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
SY88903
FEATURES
s
Up to 1.25Gbps operation
s
Low noise
s
Chatter-Free LOS Generation
s
Open Collector TTL LOS Output
s
TTL /EN Input
s
Differential PECL inputs for data
s
Single power supply
s
Designed for use with SY88902 and SY88904
s
Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88903 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 SY88903 generates a
chatter-free Loss of Signal (LOS) open collector TTL
output.
The SY88903 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 3. Figure 4 shows the relationship between input
level sensitivity and the voltage set on LOS
LVL
. Figure 5
shows the relationship between input level sensitivity and
resistor divider ratio.
The LOS output is a TTL open collector output that
requires pull-up resistor for proper operation, Figure 1.
+5V
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 LOS
6 GND
SY88903
2k
LOS
APPLICATIONS
s
s
s
s
1.25Gbps Gigabit Ethernet
531Mbps and 1062Mbps Fibre Channel
622Mbps SONET
Gigabit Interface Converter
Figure 1. LOS Output with Desired Rise Time
BLOCK DIAGRAM
D
IN
Limiting
Amplifier
ECL
Buffer
D
OUT
D
OUT
Enable
D
IN
V
REF
V
CC
Level
Detect
EN
GND
LOS
LVL
LOS
Rev.: G
Amendment: /1
1
Issue Date: July 2000

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