ADN2821 データシートの表示（PDF） - Analog Devices
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ADN2821 Datasheet PDF : 8 Pages
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Preliminary Technical Data
FEATURES
Bandwidth: 8 GHz min
Input Noise Current Density: 12pA√Hz
Optical sensitivity: −19 dBm1
Differential Transimpedance /Linear Range:
ADN2821_2: 2.0 kΩ/0.20 mA p-p
ADN2821_5: 5.0 kΩ/0.08 mA p -p
ADN2821_10: 10.0 kΩ/0.04 mA p-p
Power Dissipation: 150 mW
Differential Output Swing: 400 mV p-p min
Input Overload: 3.25 dBm @ 10 dB ER
Low-F cutoff:
ADN2821_10: 25 kHz w/CLF = 0.5 nF
On-Chip PD filter: RF = 200 Ω, CF = 20 pF
RSSI voltage and current ratio: 0.8V/mA
Die Size: 0.65 mm × 1.20 mm
APPLICATIONS
10.7 Gbps Optical Modules
SONET/SDH OC-192/STM-64 and 10 GbE
Receivers, Transceivers, Transponders
11.1 Gbps 3.3V
Transimpedance Amplifier
ADN2821
PRODUCT DESCRIPTION
The ADN2821_2/5/10 are a series of compact, high
performance SiGe 3.3V power supply Trans-impedance
Amplifiers (TIAs) optimized for small form factor 10Gbps
Metro-Access and Ethernet PD-TIA modules. The ADN2821
series features low input referred noise current and a range of
trans-impedance gains, suitable for driving a typical CDR or
transceiver directly. 8GHz minimum BW enables up to
11.1Gbps operation; 1.1µA input referred noise current enables
−19dBm sensitivity; 3.25dBm input overload current at a 10dB
extinction ratio. RSSI output signal proportional to average
input current is available for monitoring and alarm generation.
For assembly in small form factor packages, the ADN2821
series integrates a photodiode filter RFCF network on chip and
features 25kHz low frequency cutoff with small 0.5nF external
capacitor The ADN2821 operates with a 3.3V ±0.3V power
supply and is available in die form.
1 10-12 BER, 10 dB extinction ratio, 0.85 A/W PD responsivity.
3.3V
FILT ER
IN
FUNCTIONAL BLOCK DIAGRAM
VCC_FILT ER
VCC
200Ω
500Ω 50Ω
50Ω
OU T
OUT B
20pF
0.85V
GND
10mA
RSSI
GND
CL F
Figure 1. ADN2821 Block Diagram.
Rev. PrL
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Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
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