SSM2160_03 Datasheet, PDF (1/16 Pages) Analog Devices – 6-Channel, Serial Input Master/Balance Volume Controls

6-Channel, Serial Input
Master/Balance Volume Controls
SSM2160
FEATURES
Clickless Digitally Controlled Level Adjustment
SSM2160: 6 Channels
V+
7-Bit Master Control Gives 128 Levels of Attenuation
5-Bit Channel Controls Give 32 Levels of Gain
V–
Master/Channel Step Size Set by External Resistors
V_REF
100 dB Dynamic Range
Automatic Power-On Mute
Excellent Audio Characteristics:
0.01% THD+N
0.001% IMD (SMPTE)
–90 dBu Noise Floor
–80 dB Channel Separation
90 dB SNR
Single-and Dual-Supply Operation
APPLICATIONS
Home Theater Receivers
Surround Sound Decoders
Circle Surround^® and AC-3^® Decoders
DSP Soundfield™ Processors
HDTV and Surround TV Audio Systems
Automotive Surround Sound Systems
Multiple Input Mixer Consoles and Amplifiers
GENERAL DESCRIPTION
The SSM2160 allows digital control of volume of six audio
channels, with a master level control and individual channel
controls. Low distortion VCAs (voltage controlled amplifiers) are
used in the signal path. By using controlled rate-of-change drive
to the VCAs, the “clicking” associated with switched resistive
networks is eliminated in the master control. Each channel is
controlled by a dedicated 5-bit DAC providing 32 levels of gain.
A master 7-bit DAC feeds every control port giving 128 levels of
attenuation. Step sizes are nominally 1 dB and can be changed by
external resistors. Channel balance is maintained over the entire
master control range. Upon power-up, all outputs are automati-
cally muted. A 3-wire or 4-wire serial data bus enables interfacing
with most popular microcontrollers. Windows^® software and an
evaluation board for controlling the SSM2160 are available.
The SSM2160 can be operated from single supplies of +10 V to
+20 V or dual supplies from ± 5 V to ±10 V. An on-chip reference
provides the correct analog common voltage for single-supply
applications. The SSM2160 comes in a SOIC package; see the
CLK
Ordering Guide for details.
DATA
LD
WRITE
FUNCTIONAL BLOCK DIAGRAM
POWER
SUPPLY AND
REFERENCE
GENERATOR
5-BIT
CHANNEL
DAC
VCA
5-BIT
CHANNEL
DAC
VCA
5-BIT
CHANNEL
DAC
VCA
5-BIT
CHANNEL
DAC
VCA
5-BIT
CHANNEL
DAC
VCA
5-BIT
CHANNEL
DAC
7-BIT
MASTER
DAC
SHIFT REGISTER
AND
ADDRESS
DECODER
VCA
STEP SIZE
ADJUST
SSM2160
CH1 IN
CH1 OUT
CH2 IN
CH2 OUT
CH3 IN
CH3 OUT
CH4 IN
CH4 OUT
CH5 IN
CH5 OUT
CH6 IN
CH6 OUT
CH SET
MSTR SET
MSTR OUT
REV. A
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