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SY88923VKCTR Datasheet

  • SY88923VKCTR

  • 2.5Gbps HIGH-SPEED LIMITING POST AMPLIFIER

  • 8頁

  • MICREL   MICREL

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5V/3.3V 2.5Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
SY88923V
FEATURES
s
3.3V and 5V power supply options
s
Up to 2.5Gbps 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 (Micrel-Synergy laser diode
driver and controller)
s
Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88923V 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 2.5Gbps.
Signals as small as 5mVp-p can be amplified to drive
devices with PECL inputs. The SY88923V generates a
chatter-free Loss of Signal (LOS) open collector TTL
output.
The SY88923V incorporates a programmable level detect
function to identify when the input signal has been lost.
The LOS output will change from logic 鈥淟OW鈥?to logic
鈥淗IGH鈥?when input signal is smaller than the swing set by
LOS
LVL
. This information can be fed back to the EN input
of the device to maintain stability under loss of signal
condition. Using LOS
LVL
pin, the sensitivity of the level
detection can be adjusted. The LOS
LVL
voltage can be set
by connecting a resistor divider between V
CC
and V
REF
show in Figure 3. Figure 4, 5, 6, and 7 show the relationship
between input level sensitivity and the voltage set on
LOS
LVL.
The LOS output is a TTL open collector output that
requires a pull-up resistor for proper operation, Figure 1.
V
CC
SY88923V
LOS
2k
PIN CONFIGURATION
/EN 1
DIN 2
/DIN 3
VREF 4
LOSLVL 5
MSOP
K10-1
10 VCC
9 DOUT
8 /DOUT
7 LOS
6 GND
Figure 1. LOS Output with Desired Rise Time
APPLICATIONS
s
s
s
s
s
s
1.25Gbps and 2.5Gbps Gigabit Ethernet
531Mbps, 1062Mbps and 2.12Gbps Fibre Channel
622Mbps SONET
Gigabit Interface Converter
2.5Gbps SDH/SONET
2.5Gbps Proprietary Links
BLOCK DIAGRAM
D
IN
Limiting
Amplifer
ECL
Buffer
D
OUT
/D
OUT
/EN
/D
IN
V
REF
Enable
V
CC
GND
Level
Detect
LOS
LVL
LOS
Rev.: B
Amendment: /0
1
Issue Date: August 2000

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