11.1 Gbps 3.3V

Transimpedance Amplifier

Preliminary Technical Data

ADN2821

Rev. PrL

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FEATURES

Bandwidth: 8 GHz min

Input Noise Current Density: 12pA√Hz

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:

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

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

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.

FUNCTIONAL BLOCK DIAGRAM

Figure 1. ADN2821 Block Diagram.

500

Ω

50

Ω

50

Ω

0.85V

10mA

200

Ω

20pF

OU T

OU T B

GN D

GN D

CL F

FI LT ER

IN

VCC

VCC_FI LT ER

3.3V

RSSI