Dual Single-Supply

Audio Operational Amplifier

SSM2135

Rev. G

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FEATURES

Excellent sonic characteristics

High output drive capability

5.2 nV/√Hz equivalent input noise @ 1 kHz

0.003% THD + N (VOUT = 1 V p-p @ 1 kHz)

3.5 MHz gain bandwidth

Unity-gain stable

Low cost

APPLICATIONS

Multimedia audio systems

Microphone preamplifiers

Headphone drivers

Differential line receivers

Balanced line drivers

Audio ADC input buffers

Audio DAC l-V converters and filters

Pseudoground generators

PIN CONNECTIONS

OUT A 1

–IN A

2

+IN A

3

V–/GND

4

V+

8

OUT B

7

–IN B

6

+IN B

5

SSM2135

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead Narrow Body SOIC (R Suffix)

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

5.2 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 output stage permits output swing approaching the

rail under 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 conditioning in single-supply, Σ-Δ, analog-to-

digital converter subsystems such as the AD1877. The SSM2135

makes an ideal single-supply stereo output amplifier for audio

digital-to-analog converters (DACs) because of its low noise

and distortion.

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

+INx

9V

–INx

9V

V+

V–/GND

OUTx

Figure 2.