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Dual Single-Supply

Audio Operational Amplifier

FEATURES

Excellent Sonic Characteristics

High Output Drive Capability

5.2 nV/

÷Hz Equivalent Input Noise @ 1 kHz

3.5 MHz Gain Bandwidth

Unity-Gain Stable

Low Cost

APPLICATIONS

Multimedia Audio Systems

Microphone Preamplifier

Headphone Driver

Differential Line Receiver

Balanced Line Driver

Audio ADC Input Buffer

Audio DAC l-V Converter and Filter

Pseudo-Ground Generator

PIN CONNECTIONS

8-Lead Narrow-Body SOIC

(S Suffix)

OUT A

–IN A

+IN A

V+

OUT B

–IN B

+IN B

V–/GND

SSM-2135

GENERAL DESCRIPTION

The SSM2135 Dual Audio Operational Amplifier permits excel-

lent performance in portable or low power audio systems, with

an operating supply range of +4 V to +36 V or

±2 V to ±18 V.

The unity gain stable device has very low voltage noise of

4.7 nV/

÷Hz, and total harmonic distortion plus noise below 0.01%

over normal signal levels and loads. Such characteristics are

enhanced by wide output swing and load drive capability. A unique

moderate load conditions. Under severe loading, the SSM2135

still maintains a wide output swing with ultralow distortion.

Particularly well suited for computer audio systems and portable

digital audio units, the SSM2135 can perform preamplification,

headphone and speaker driving, and balanced line driving and

receiving. Additionally, the device is ideal for input signal condi-

tioning in single-supply, sigma-delta, analog-to-digital converter

subsystems such as the AD1878/AD1879.

The SSM2135 is available in an 8-lead plastic SOIC package

and is guaranteed for operation over the extended industrial

temperature range of –40

∞C to +85∞C.

FUNCTIONAL BLOCK DIAGRAM

+IN

9V

–IN

9V

V+

V–/GND

OUT

*Protected by U.S. Patent No. 5,146,181.