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ADN2891 Datasheet

  • ADN2891

  • 3.3 V, 3.2 Gbps,Limiting Amplifier

  • 966.03KB

  • 17页

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3.3 V, 3.2 Gbps,
Limiting Amplifier
ADN2891
FEATURES
Input sensitivity: 4 mV p-p
80 ps rise/fall times
CML outputs: 700 mV p-p differential
Programmable LOS detector: 3.5 mV to 35 mV
Rx signal strength indicator (RSSI)
SFF-8472-compliant average power measurement
Single-supply operation: 3.3 V
Low power dissipation: 145 mW
Available in space-saving 3 mm 脳 3 mm, 16-lead LFCSP
Extended temperature range: 鈭?0掳C to +95掳C
SFP reference design available
GENERAL DESCRIPTION
The ADN2891 is a 3.2 Gbps limiting amplifier with integrated
loss-of-signal (LOS) detection circuitry and a received signal
strength indicator (RSSI). This part is optimized for SONET,
Gigabit Ethernet (GbE), and Fibre Channel optoelectronic
conversion applications. The ADN2891 has a differential input
sensitivity of 4 mV p-p and accepts up to a 2.0 V p-p differential
input overload voltage. The ADN2891 supports current mode
logic (CML) outputs with controlled rise and fall times.
By monitoring the bias current through a photodiode, the on-
chip RSSI detector measures the average power received with
2% typical linearity over the entire valid input range of the
photodiode. The on-chip RSSI detector facilitates SFF-8472-
compliant optical transceivers by eliminating the need for
external RSSI detector circuitry.
Additional features include a programmable loss-of-signal
(LOS) detector and output squelch.
The ADN2891 is available in a 3 mm 脳 3 mm, 16-lead LFCSP.
APPLICATIONS
SFP/SFF/GBIC optical transceivers
OC-3/OC-12/OC-48, GbE, Fibre Channel (FC) receivers
10GBASE-LX4 transceivers
WDM transponders
FUNCTIONAL BLOCK DIAGRAM
AVCC
AVEE
DRVCC
DRVCC
DRVEE
ADN2891
50惟
PIN
50惟
OUTP
OUTN
50惟
50惟
3k惟
PD_VCC
PD_CATHODE
05244-001
ADN2880
NIN
+V
V
REF
LOS
RSSI/LOS
DETECTOR
10k
惟
RSSI_OUT
ADuC7020
CAZ1
0.01
渭
F
CAZ2
THRADJ SQUELCH
Figure 1.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
漏2005 Analog Devices, Inc. All rights reserved.

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