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

Digitally Controlled

8

2 Audio Mixer

SSM2163

FEATURES

Each of 8 Inputs Can Be Assigned to Either or Both

Outputs

Voltage Inputs and Outputs – No Need For External

Amplifiers

Each Input Provides 63 dB of Attenuation in 1 dB Steps,

Plus Mute

–82 dBu Signal-to-Noise Ratio (0 dBu = 0.775 V rms)

+10 dBu of Headroom

0.007% THD+N (Unity Gain, @ 1 kHz, 0 dBu)

Power-Up/System Mute Feature

Industry-Standard 3-Wire Serial Interface

Data Out Terminal Permits Daisy Chaining of Multiple

SSM2163s

Single or Dual Supply Operation

28-Pin Plastic DIP and SOIC Package

APPLICATIONS

Multimedia System Mixing

Audio Mixing Consoles

Broadcast Equipment

Intercom/Paging Systems

Musical Instruments

GENERAL DESCRIPTION

The SSM2163 provides eight audio inputs, each of which can

be mixed under digital control to a stereo output. Each input

channel can be attenuated up to 63 dB in 1 dB intervals, plus

fully muted. Additionally, any input can be assigned to either or

both outputs. A standard 3-wire serial interface is employed,

plus a Data Out terminal to facilitate daisy chaining of multiple

mixer ICs. No external components are required for normal

operation.

Excellent audio performance is attained. The SSM2163 has a

signal-to-noise ratio of –82 dBu (0 dBu = 0.775 V rms), with

10 dBu of headroom resulting in total dynamic range of 92 dBu.

Total harmonic distortion plus noise is 0.007% at 1 kHz with all

levels set at unity gain.

© Analog Devices, Inc., 1995

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

The SSM2163 can be operated from single (+5 V to +14 V) or

dual (

±4 V to ±7 V) supplies, and is housed in 28-pin plastic

DIP and SOIC packages.

The SSM2163 is an ideal companion product to the Analog

Devices family of stereo codecs in high performance multi-

media systems requiring mixing of multiple signals.

SIMPLIFIED BLOCK DIAGRAM

DCA

DCA

DCA

DCA

DCA

DCA

DCA

DCA

OUTPUT

SWITCHING

NETWORK

VOLTAGE

REFERENCE

GENERATOR

ACOM

AGND

SHIFT

REGISTER

AND

ADDRESS

DECODER

SYSTEM MUTE

DATA OUT

CLK

DATA

LD

WRITE

DGND

SSM2163

DCA: DIGITALLY CONTROLLED ATTENUATOR