ADN2892ACP-RL7(RevPrA) Просмотр технического описания (PDF) - Analog Devices
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ADN2892ACP-RL7 Datasheet PDF : 12 Pages
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Preliminary Technical Data
3.3 V 4.25 Gb/s
Limiting Amplifier
ADN2892
FEATURES
SFP reference design available
Input sensitivity: 3 mV p-p
65 ps rise/fall times
BW Select to support Multi-Rate 1x/2x/4x FC modules
Optional LOS Output Inversion to support SFF
The ADN2892 is a high gain, limiting amplifier optimized for
use in Fibre Channel and GbE optical receivers. The ADN2892
accepts input levels of up to 2.0 V p-p differential and has 3 mV
p-p differential input sensitivity. The ADN2892 provides the
receiver functions of quantization and loss of signal (LOS)
detection.
CML outputs: 700 mV p-p differential
Programmable LOS detector: 3 mV to 45 mV
Rx signal strength indicator (RSSI):
SFF-8472 compliant average power measurement
Single supply operation: 3.3 V
Low power dissipation: 160 mW
Available in space-saving 3 × 3 mm 16-lead LFCSP
Increased Temperature Range: -40oC to 95oC
APPLICATIONS
SFP/SFF/GBIC optical transceivers
1x/2x/4x Multi-rate Fibre Channel receivers
The ADN2892 has an on-chip selectable filter to reduce the BW
of the limamp to 1.5GHz in order to filter out the relaxation
oscillation of legacy 1Gb/s Fiber Channel transmitters with CD
lasers. The reduced BW will also allow for more optical Rx
sensitivity margin at the lower data rates such as 1xFC and
1GbE in multi-rate modules.
The limiting amplifier also measures average received power
based on a direct measurement of the photodiode current with
better than 1 dB of accuracy over the entire input range of the
receiver. This eliminates the need for external average Rx power
detection circuitry in SFF-8472 compliant optical transceivers.
LX4
WDM transponders
The ADN2892 limiting amplifier operates from a single 3.3 V
supply, has low power dissipation, and is available in a space-
saving 3 × 3 mm 16-lead lead frame chip scale package
(LFCSP).
PRODUCT OVERVIEW
FUNCTIONAL BLOCK DIAGRAM
ADN2882
PD_VCC
PD_CATHODE
VREF
+V
10kΩ
ADuC7020
Figure 1.
Rev. PrA.
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