Rail-to-Rail, High Output Current Amplifier

AD8397

Rev. 0

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FEATURES

Dual operational amplifier

Voltage feedback

Wide supply range: from 3 V to 24 V

Rail-to-rail output

Output swing to within 0.5 V of supply rails

High linear output current

310 mA peak into 32 Ω on ±12 V supplies while maintaining

−80 dBc SFDR

Low noise

4.5 nV/√Hz voltage noise density @ 100 kHz

1.5 pA/√Hz current noise density @ 100 kHz

High speed

69 MHz bandwidth (G = 1, −3 dB)

APPLICATIONS

Twisted-pair line drivers

Audio applications

General-purpose high current amplifiers

GENERAL DESCRIPTION

The AD8397 has two voltage feedback operational amplifiers

capable of driving heavy loads with excellent linearity. The

common-emitter, rail-to-rail output stage surpasses the output

voltage capability of typical emitter-follower output stages and

can swing to within 0.5 V of either rail while driving a 25 Ω

load. The low distortion, high output current, and wide output

dynamic range make the AD8397 ideal for applications that

require a large signal swing into a heavy load.

Fabricated with ADI’s high speed eXtra Fast Complementary

Bipolar High Voltage (XFCB-HV) process, the high bandwidth

and fast slew rate of the AD8397 keep distortion to a minimum

while also dissipating minimum power. The AD8397 is available

in a standard 8-lead SOIC package and, for higher power appli-

cations, a thermally enhanced 8-lead SOIC EPAD package. Both

packages can operate from −40°C to +85°C.

PIN CONFIGURATION

OUT1

1

–IN1

2

+IN1

3

OUT2

–IN2

+IN2

8

7

6

5

Figure 1. 8-Lead SOIC

1.50

–1.50

–1.25

–1.00

–0.75

–0.50

–0.25

0

0.25

0.50

0.75

1.00

1.25

0

2

4

6

8

10

12

14

16

18

20

TIME (

µs)

12

–12

–9

–6

–3

0

3

6

9

0

2

4

6

8

10

12

14

16

18

20

TIME (

µs)