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SY88943VKCTR Datasheet

  • SY88943VKCTR

  • 5V/3.3V 2.5Gbps LIMITING POST AMPLIFIER WITH SIGNAL DETECT

  • 8頁(yè)

  • MICREL   MICREL

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5V/3.3V 2.5Gbps
LIMITING POST AMPLIFIER
WITH SIGNAL DETECT
FEATURES
s
3.3V and 5V power supply options
s
Up to 2.5Gbps operation
s
Low noise
s
Chatter-fee signal detect (SD) generation
s
Open collector TTL signal detect (SD) 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 (3mm) 10-pin MSOP
SY88943V
DESCRIPTION
The SY88943V 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 SY88943V generates a
chatter-free Signal Detect (SD) open collector TTL output.
The SY88943V incorporates a programmable level detect
function to identify when the input signal has been lost.
The SD output will change from logic 鈥淗IGH鈥?to logic 鈥淟OW鈥?/div>
when input signal is smaller than the swing set by SD
LVL
.
This information can be fed back to the EN input of the
device to maintain stability under loss of signal condition.
Using SD
LVL
pin, the sensitivity of the level detection can
be adjusted. The SD
LVL
voltage can be set by connecting
a resistor divider between V
CC
and V
REF
as shown in Figure
3. Figure 4, 5, 6, and 7 show the relationship between
input level sensitivity and the voltage set on SD
LVL
.
The SD output is a TTL open collector output that
requires a pull-up resistor for proper operation, Figure 1.
V
CC
SY88943V
SD
4.7k鈩?to 10k鈩?/div>
PIN CONFIGURATION
EN 1
DIN 2
/DIN 3
VREF 4
SDLVL 5
MSOP
K10-1
10 VCC
9 DOUT
8 /DOUT
7 SD
6 GND
Figure 1. SD Output with Desired Rise Time
APPLICATIONS
s
s
s
s
s
s
1.25Gbps and 2.5Gbps 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
/D
IN
Limiting
Amplifer
ECL
Buffer
D
OUT
/D
OUT
Enable
V
REF
V
CC
GND
Level
Detect
EN
SD
LVL
SD
Rev.: B
Amendment: /0
1
Issue Date: August 2000

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