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REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Bipolar/JFET,

Audio Operational Amplifier

OP176*

FEATURES

Low Noise: 6 nV/

√Hz

High Slew Rate: 25 V/

Wide Bandwidth: 10 MHz

Low Supply Current: 2.5 mA

Low Offset Voltage: 1 mV

Unity Gain Stable

SO-8 Package

APPLICATIONS

Line Driver

Active Filters

Fast Amplifiers

Integrators

PIN CONNECTIONS

8-Lead Narrow-Body SO

8-Lead Epoxy DIP

(S Suffix)

(P Suffix)

NULL

–IN

+IN

V–

NC

V+

OUT

NULL

1

2

3

45

6

7

8

OP176

1

2

3

45

6

7

8

NULL

–IN

+IN

V–

OP-482

NC

V+

OUT

NULL

OP176

GENERAL DESCRIPTION

The OP176 is a low noise, high output drive op amp that

features the Butler Amplifier front-end. This new front-end

design combines both bipolar and JFET transistors to attain

amplifiers with the accuracy and low noise performance of

bipolar transistors, and the speed and sound quality of JFETs.

Total Harmonic Distortion plus Noise equals previous audio

amplifiers, but at much lower supply currents.

Improved dc performance is also provided with bias and offset

currents greatly reduced over purely bipolar designs. Input

offset voltage is guaranteed at 1 mV and is typically less than

200

µV. This allows the OP176 to be used in many dc coupled

or summing applications without the need for special selections

or the added noise of additional offset adjustment circuitry.

The output is capable of driving 600

Ω loads to 10 V rms while

maintaining low distortion. THD + Noise at 3 V rms is a low

0.0006%.

The OP176 is specified over the extended industrial (–40

°C to

+85

°C) temperature range. OP176s are available in both plastic

DIP and SO-8 packages. SO-8 packages are available in 2500

piece reels. Many audio amplifiers are not offered in SO-8

surface mount packages for a variety of reasons, however, the

OP176 was designed so that it would offer full performance in

surface mount packaging.

*Protected by U.S. Patent No. 5101126.

Simplified Schematic

RB4

RB3

QB5

RB5

QB6

RB7

RB6

QB7

J1

R4

Q9

Q10

J2

Q2

Q1

Z2

Q6

Q5

CCB

CF

QS1

RS1

R5

6

RS2

QS2

R3

Q3

Q4

QS3

QB9

Q8

Q11

Q7

CC2

4

QB8

R2L

R2P1

R2A

R2P2

R2S

5

R1P2

1

R1P1

R1L

R1A

R1S

QB3

Z1

QB1

JB1

QB4

CB1

QB2

RB1

RB2

CC1

3

2

7