SY88923V Datasheet, PDF (1/6 Pages) Micrel Semiconductor – 2.5Gbps HIGH-SPEED LIMITING POST AMPLIFIER

Micrel, Inc.
5V/3.3V 2.5Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
SY88923V
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's Laser Diode Driver
and Controller
s Available in a tiny 10-pin (3mm) MSOP
APPLICATIONS
s 1.25Gbps and 2.5Gbps Gigabit Ethernet
s 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel
s 622Mbps SONET
s Gigabit Interface Converter
s 2.5Gbps SDH/SONET
s 2.5Gbps Proprietary Links
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 5mV_PP 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 “LOW” to logic
“HIGH” 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. Performance Curves 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.
SY88923V
LOS
V_CC
2.5kΩ
BLOCK DIAGRAM
Figure 1. LOS Output with Desired Rise Time
D_IN
/D_IN
V_REF
V_CC
GND
Limiting
Amplifer
LOS_LVL
M9999-051706
[e-mail] or [phone]
ECL
Buffer
Enable
D_OUT
/D_OUT
/EN
Level
Detect
LOS
1
Rev.: E Amendment: /0
Issue Date: May 2006