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a

Low Cost Quad

Voltage Controlled Amplifier

SSM2164

GENERAL DESCRIPTION

The SSM2164 contains four independent voltage controlled

amplifiers (VCAs) in a single package. High performance

(100 dB dynamic range, 0.02% THD) is provided at a very low

cost-per-VCA, resulting in excellent value for cost sensitive gain

control applications. Each VCA offers current input and output

for maximum design flexibility, and a ground referenced

–33 mV/dB control port.

All channels are closely matched to within 0.07 dB at unity gain,

and 0.24 dB at 40 dB of attenuation. A 120 dB gain range is

possible.

A single resistor tailors operation between full Class A and AB

modes. The pinout allows upgrading of SSM2024 designs with

minimal additional circuitry.

The SSM2164 will operate over a wide supply voltage range of

±4 V to ±18 V. Available in 16-pin P-DIP and SOIC packages,

the device is guaranteed for operation over the extended

industrial temperature range of –40

°C to +85°C.

FEATURES

Four High Performance VCAs in a Single Package

0.02% THD

No External Trimming

120 dB Gain Range

0.07 dB Gain Matching (Unity Gain)

Class A or AB Operation

APPLICATIONS

Remote, Automatic, or Computer Volume Controls

Automotive Volume/Balance/Faders

Audio Mixers

Compressor/Limiters/Compandors

Noise Reduction Systems

Automatic Gain Controls

Voltage Controlled Filters

Spatial Sound Processors

Effects Processors

FUNCTIONAL BLOCK DIAGRAM

POWER SUPPLY

AND BIASING CIRCUITRY

VCA4

VCA3

VCA2

VCA1

V+

GND

V–

MODE