Low Cost, General-Purpose

High Speed JFET Amplifier

Data Sheet

AD825

Rev. G

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FEATURES

High speed

41 MHz, −3 dB bandwidth

125 V/µs slew rate

80 ns settling time

Input bias current of 20 pA and noise current of 10 fA/√Hz

Input voltage noise of 12 nV/√Hz

Fully specified power supplies: ±5 V to ±15 V

Low distortion: −76 dB at 1 MHz

High output drive capability

Drives unlimited capacitance load

50 mA min output current

No phase reversal when input is at rail

Available in 8-lead SOIC

APPLICATIONS

CCDs

Low distortion filters

Mixed gain stages

Audio amplifiers

Photo detector interfaces

ADC input buffers

DAC output buffers

CONNECTION DIAGRAMS

Figure 1. 8-Lead Plastic SOIC (R-8) Package

Figure 2. 16-Lead Plastic SOIC (RW-16) Package

GENERAL DESCRIPTION

The AD825 is a superbly optimized operational amplifier for

high speed, low cost, and dc parameters, making it ideally

suited for a broad range of signal conditioning and data

acquisition applications. The ac performance, gain, bandwidth,

slew rate, and drive capability are all very stable over

temperature. The AD825 also maintains stable gain under

varying load conditions.

The unique input stage has ultralow input bias current and

input current noise. Signals that go to either rail on this high

performance input do not cause phase reversals at the output.

These features make the AD825 a good choice as a buffer for

MUX outputs, creating minimal offset and gain errors.

The AD825 is fully specified for operation with dual ±5 V and

±15 V supplies. This power supply flexibility, and the low

supply current of 6.5 mA with excellent ac characteristics under

all supply conditions, makes the AD825 well-suited for many

demanding applications.

Figure 3. Performance with Rail-to-Rail Input Signals

NC = NO CONNECT

AD825

TOP VIEW

(Not to Scale)

NC

1

–IN

2

+IN

3

–VS 4

NC

8

+VS

7

OUTPUT

6

NC

5

NC

1

NC

2

NC

3

–INPUT

4

+INPUT

5

–VS 6

NC

7

NC

8

NC

10

NC

16

NC

15

NC

14

+VS

13

OUTPUT

12

NC

11

NC

9

AD825

TOP VIEW

(Not to Scale)

NC = NO CONNECT

10V

200ns

10V