Low Noise, 1 GHz

FastFET Op Amps

ADA4817-1/ADA4817-2

Rev. 0

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FEATURES

High speed

Slew rate: 870 V/μs

0.1% settling time: 9 ns

Low input bias current: 2 pA

Low input capacitance

Common-mode capacitance: 1.5 pF

Differential-mode capacitance: 0.1 pF

Low noise

4 nV/√Hz @ 100 kHz

2.5 fA/√Hz @ 100 kHz

Low distortion

Offset voltage: 2 mV maximum

High output current: 70 mA

Supply current per amplifier: 19 mA

Power-down supply current per amplifier: 1 mA

APPLICATIONS

Photodiode amplifiers

Data acquisition front ends

Instrumentation

Filters

ADC drivers

CCD output buffers

CONNECTION DIAGRAMS

NC = NO CONNECT

1

PD

2

FB

3

–IN

4

+IN

7OUT

6NC

ADA4817-1

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead ADA4817-1 LFCSP (CP-8-2)

1

–IN1

2

+IN1

3

NC

4

11 NC

10 +IN2

9–IN2

ADA4817-2

TOP VIEW

(Not to Scale)

NC = NO CONNECT

Figure 2. 16-Lead ADA4817-2 LFSCP (CP-16-4)

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 are

developed in 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 1.5 pF of input capacitance, low noise (4 nV/√Hz),

low offset voltage (2 mV maximum), and 1050 MHz −3 dB

bandwidth, the ADA4817-1/ADA4871-2 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, the ability

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

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

including active filtering and ADC driving.

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

and the ADA4817-2 is available in a 4 mm × 4 mm 16-lead LFSCP.

Both packages feature a low distortion pinout, which improves

second harmonic distortion and simplifies the layout of the

circuit board. In addition, both packages feature an exposed

paddle that provides a low thermal resistance path to the

printed circuit board (PCB). This enables more efficient heat

transfer and increases reliability. Both products are rated to

work over the extended industrial temperature range (−40°C

to +105°C).