Low Noise, 1 GHz

FastFET Op Amps

Data Sheet

ADA4817-1/ADA4817-2

Rev. B

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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: 1.3 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: 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

CONNECTION DIAGRAMS

NC = NO CONNECT

1

PD

2

FB

3

–IN

4

+IN

7 OUT

6 NC

ADA4817-1

TOP VIEW

(Not to Scale)

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

FB

1

–IN

2

+IN

3

PD

8

7

OUT

6

NC

5

NC = NO CONNECT

ADA4817-1

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead SOIC (RD-8-1)

1

–IN1

2

+IN1

3

NC

4

11 NC

10 +IN2

9

–IN2

ADA4817-2

TOP VIEW

(Not to Scale)

NC = NO CONNECT

Figure 3. 16-Lead LFCSP (CP-16-20)

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.

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 including active filtering and 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 paddle that provides a

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

This 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).