sy88923 Micrel Semiconductor, sy88923 Datasheet

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sy88923

Manufacturer Part Number
sy88923
Description
Sy88923 2.5gb/s High-speed Limiting Post Amplifier
Manufacturer
Micrel Semiconductor
Datasheet

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Micrel, Inc.
M9999-061907
hbwhelp@micrel.com or (408) 955-1690
FEATURES
APPLICATIONS
BLOCK DIAGRAM
Up to 2.5Gbps operation
Low noise
Chatter-Free LOS generation
Open Collector TTL LOS output
TTL /EN Input
Differential PECL inputs for data
Single power supply
Designed for use with SY88922 and SY88904 or
SY88905
Available in a tiny 10-pin (3mm) MSOP
1.25Gbps Gigabit Ethernet
531Mbps and 1062Mbps Fibre Channel
622Mbps SONET
Gigabit interface converter
2.5Gbps SDH/SONET
LOS
GND
V
V
D
D
REF
LVL
CC
IN
IN
Limiting
Amplifer
Not recommended for new designs
LIMITING POST AMPLIFIER
2.5Gbps HIGH-SPEED
1
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 SY88923 generates a chatter-free Loss
of Signal (LOS) open collector TTL output.
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 condition.
Using LOS
be adjusted. The LOS
a resistor divider between V
Figure 4 show the relationship between input level sensitivity
and the voltage set on LOS
relationship between input level sensitivity and resistor
divider ratio.
requires a pull-up resistor for proper operation, Figure 1.
Level
Detect
ECL
Buffer
DESCRIPTION
The SY88923 limiting post amplifier with its high gain
The SY88923 incorporates a programmable level detect
The LOS output is a TTL open collector output that
Figure 1. LOS Output with Desired Rise Time
Enable
LVL
pin, the sensitivity of the level detection can
SY88923
LVL
D
LOS
D
EN
OUT
OUT
voltage can be set by connecting
LOS
CC
LVL
and V
+5.0V
. Figure 5 shows the
2.5k
REF
Rev.: F
Issue Date: June 2007
. Figure 3 and
SY88923
Amendment: /0
SY88923

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sy88923 Summary of contents

Page 1

... LIMITING POST AMPLIFIER Not recommended for new designs DESCRIPTION The SY88923 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 ...

Page 2

... The linear signal output from a transimpedance amplifier can contain significant amounts of noise, and may vary in amplitude over time. The SY88923 limiting amplifier quantizes the signal and outputs a voltage- limited waveform. The /EN pin allows the user to disable the output signal without removing the input signal ...

Page 3

... V fin — — — — — — 0.5 — 0.5 µs 0.5 — 0.5 µs 0.5 — 0.5 µs — mVp SY88923 ° C Max. Unit 35 mA — mA (5) 20 µA (6) 100 V –1 ±100 0.5 V 250 uA V –880 –1620 CC V –2.325 CC — ...

Page 4

... Micrel, Inc. DESIGN PROCEDURE Output Termination The SY88923 outputs must be terminated with a 50Ω load to V – 2V (or thevenin equivalent). CC Layout and PCB Design Since the SY88923 is a high-frequency component, performance can largely be determined by board layout and design. A common problem with high-gain amplifiers is feedback from the large swing outputs to the input via power supply ...

Page 5

... Micrel, Inc. APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION M9999-061907 hbwhelp@micrel.com or (408) 955-1690 5 SY88923 ...

Page 6

... Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify M9999-061907 hbwhelp@micrel.com or (408) 955-1690 + 1 (408) 474-1000 FAX WEB Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. 6 http://www.micrel.com SY88923 Rev. 00 ...

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