Data Sheet

ADA4817-1/ADA4817-2

Low Noise, 1 GHz FastFET Op Amps

Rev. H

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FEATURES

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High speed

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−3 dB bandwidth (G = 1, RL = 100 Ω): 1050 MHz

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Slew rate: 870 V/µs

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0.1% settling time: 9 ns

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Input bias current: 2 pA typical

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Input capacitance

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Common-mode capacitance: 1.3 pF typical

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Differential mode capacitance: 0.1 pF typical

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Low input noise

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Voltage noise: 4 nV/√Hz at 100 kHz

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Current noise: 2.5 fA/√Hz at 100 kHz

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Low distortion: −90 dBc at 10 MHz (G = 1, RL = 1 kΩ)

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Linear output current: 40 mA

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Supply quiescent current per amplifier: 19 mA typical

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Powered down supply quiescent current per amplifier: 1.5 mA

typical

APPLICATIONS

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Photodiode amplifiers

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Data acquisition front ends

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Instrumentation

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Filters

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ADC drivers

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Output buffers

GENERAL DESCRIPTION

The ADA4817-1 (single) and ADA4817-2 (dual) FastFET™ amplifi-

ers are unity-gain stable, ultrahigh speed, voltage feedback ampli-

fiers 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 impedan-

ces.

With 1.3 pF of input capacitance, low noise (4 nV/√Hz), low offset

voltage (2 mV maximum), and 1050 MHz −3 dB bandwidth, the

ADA4817-1/ADA4817-2 are ideal for data acquisition front ends as

well as wideband transimpedance applications, such as photodiode

preamps.

With a wide supply voltage range from 5 V to 10 V and the

ability to operate on either single or dual supplies, the ADA4817-1/

ADA4817-2 are designed to work in a variety of applications inclu-

ding active filtering and analog-to-digital converter (ADC) driving.

The ADA4817-1 is available in a 3 mm × 3 mm, 8-lead LFCSP and

8-lead SOIC, and the ADA4817-2 is available in a 4 mm × 4 mm,

16-lead LFCSP. These packages feature a low distortion pinout that

improves second harmonic distortion and simplifies circuit board

layout. They also feature an exposed pad that provides a low

thermal resistance path to the printed circuit board (PCB). The

EPAD enables more efficient heat transfer and increases reliability.

These products are rated to work over the extended industrial

temperature range (−40°C to +105°C).