Low Noise, 1 GHz

FastFET Op Amps

Data Sheet

ADA4817-1/ADA4817-2

Rev. C

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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 at 100 kHz

2.5 fA/√Hz at 100 kHz

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

3

–IN

4

+IN

1

PD

2

FB

6NIC

7OUT

ADA4817-1

TOP VIEW

(Not to Scale)

NOTES

1. NIC = NO INTERNAL CONNECTION.

Figure 1. 8-Lead LFCSP (CP-8-13)

FB

–IN

+IN

PD

OUT

NIC

NOTES

1. NIC = NO INTERNAL CONNECTION.

ADA4817-1

TOP VIEW

(Not to Scale)

1

2

3

4

8

7

6

5

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

ADA4817-2

TOP VIEW

(Not to Scale)

12

11

10

1

3

4

9

2

–IN1

+IN1

NIC

NC

+IN2

–IN2

NOTES

1. NIC = NO INTERNAL CONNECTION.

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/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 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).