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GENERAL DESCRIPTION

The ADA4817-1 (single) and ADA4817-2 (dual) FastFET? amplifiers are unity-gain stable, ultrahigh speed voltage feedback amplifiers with FET inputs. These amplifiers were developed with the Analog Devices, Inc., proprietary eXtra Fast Complementary Bipolar (XFCB) process, which allows the amplifiers to achieve ultralow noise (4 nV/√Hz; 2.5 fA/√Hz) as well as very high input impedances.

With 1.3 pF of input capacitance, low noise (4 nV/√Hz), low offset voltage (2 mV maximum), and 1050 MHz ?3 dB band width, the ADA4817-1/ADA4871-2 are ideal for data acquisition front ends as well as wideband transimpedance applications, such as photodiode preamps.

FEATURES

High speed

?3 dB bandwidth (G = 1, RL = 100 Ω): 1050 MHz Slew rate: 870 V/μs 0.1 settling time: 9 ns

Low input bias current: 2 pA

Low input capacitance

Common-mode capacitance: 1.3 pF

Differential-mode capacitance: 0.1 pF

Low noise

4 nV/√Hz @ 100 kHz

2.5 fA/√Hz @ 100 kHz

Low distortion

?90 dBc @ 10 MHz (G = 1, RL = 1 kΩ)

Offset voltage: 2 mV maximum

High output current: 40 mA

Supply current per amplifier: 19 mA

Power-down supply current per amplifier: 1.5 mA

APPLICATIONS

Photodiode amplifiers

Data acquisition front ends

Instrumentation

Filters

ADC drivers

CCD output buffers