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ADN2880 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADN2880
Description  3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADN2880 Datasheet(HTML) 1 Page - Analog Devices

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3.2 Gbps, 3.3 V, Low Noise,
Transimpedance Amplifier
ADN2880
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Bandwidth: 2.5 GHz
Optical sensitivity: −24.2 dBm1
Differential transimpedance: 4400 V/A
Power dissipation: 70 mW
Differential output swing: 260 mV p-p
Input overload current: 4.3 mA p-p
On-chip RSSI function
Low frequency cutoff: 20 kHz
On-chip PD filter: RF = 200 Ω, CF = 20 pF
Die size: 0.7 mm × 1.2 mm
APPLICATIONS
3.2 Gbps or below optical receivers
SONET/GbE/FC optical receivers
SFF-8472-compliant receivers
PIN/APD-TIA receive optical subassemblies (ROSA)
GENERAL DESCRIPTION
The ADN2880 is a 3.3 V, high gain SiGe transimpedance
amplifier (TIA). The TIA converts the small signal current of a
photo detector into differential voltage output. The ADN2880
features a 315 nA typical input-referred noise, enabling an
optical sensitivity of −24.2 dBm (0.85 A/W PIN). With a
bandwidth of 2.5 GHz, the ADN2880 allows a data rate
operation up to 3.2 Gbps. Typical power dissipation is
approximately 70 mW.
To facilitate the assembly in small form factor packages, such
as TO-46 headers, the ADN2880 provides an on-chip RC filter
(200 Ω, 20 pF) and features a 20 kHz low frequency cutoff
without using an external capacitor. An on-chip RSSI circuit,
which generates a voltage proportional to the average photo-
diode current, is also available for power monitoring and
assembly alignment.
The ADN2880 is available in die form. With a chip area of
1.2 mm × 0.7 mm, the TIA layout is specifically optimized for
TO-Can-based packages.
1 Based on 1550 nm PIN, responsivity = 0.85 A/W, ER = 9 dB, BER < 10−10.
FUNCTIONAL BLOCK DIAGRAM
1400
Ω
0.85V
20pF
50
Ω
200
Ω
50
Ω
3.3V
FILTER
IN
VCCFILTER
VCC
GND
GND
CAP
5mA
OUTB
OUT
RSSI
Figure 1.


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