SSM2161_15 Datasheet, PDF (1/7 Pages) Analog Devices – 6 and 4 Channel, Clickless Serial Input Balance/Master Volume Controls

a 6 and 4 Channel, “Clickless” Serial Input
Balance/Master Volume Controls
SSM2160/SSM2161
FEATURES
GENERAL DESCRIPTION
Digitally-Controlled “Clickless” Level Adjustment
The SSM2160 and SSM2161 allow digital control of volume for
SSM2160: Six Channels
six and four channels, respectively, with a master level control.
SSM2161: Four Channels
“Clicking” normally encountered with resistor-ladder attenua-
Master Control has 128 1 dB Steps
tors is eliminated by using high performance Voltage Controlled
Each Channel has 32 1 dB Steps
Amplifiers (VCAs) in the signal path. The VCA control ports
Step Sizes Can Be Changed Using External Resistors
are driven by DACs with controlled output rate-of-change to in-
OBSOLETE High Gain Accuracy
100 dB Gain Range
Power On Mute
Excellent Audio Characteristics:
–100 dBu SNR (0 dBu = 0.775 V rms, V_S = ؎5 V)
+10 dBu Headroom (V_S = ؎5 V)
0.008% THD+N (@ 1 kHz, V_IN = –10 dBu, Unity Gain)
–80 dB Crosstalk (@ 1 kHz)
Single or Dual Supply Operation
APPLICATIONS
Dolby* Pro-Logic Master Volume/Balance Control
Home THX† Systems
DSP Soundfield Processors
Automotive Audio Systems
HDTV Audio Systems
sure noiseless volume changes. Each channel is controlled by a
dedicated 5-bit DAC, providing 32 steps of adjustment. In addi-
tion, a master 7-bit DAC feeds every control port, with 128
steps. Therefore, a balance can be achieved among all channels
over a 32 step range, and the master control allows adjustment
over its entire range while maintaining the desired channel-to-
channel balance. Master and channel step sizes are nominally
1 dB; master step sizes can be reduced by an external resistor.
Approximately 80 dB of attenuation and up to 20 dB of gain is
possible. Upon power-up, the output is automatically muted.
The SSM2160/SSM2161 can operate from single supplies of
8 V to 14 V and dual supplies from ± 4 V to ± 7 V. An on-chip
buffered supply splitter provides an analog common for single-
supply applications.
*Dolby is a registered trademark of Dolby Laboratories Licensing
*Corporation.
†Home THX is a registered trademark of Lucasfilm, Ltd.
FUNCTIONAL BLOCK DIAGRAM
CLK
DATA
LD
WRITE
SHIFT REGISTER
AND
ADDRESS
DECODER
V+
V–
ACOM
POWER
SUPPLY AND
REFERENCE
7-BIT
MASTER
DAC
5-BIT
CHANNEL
∑
DAC
TO ADDITIONAL CHANNELS
SSM-2160: SIX CHANNEL
SSM-2161: FOUR CHANNEL
VCA
V_IN
AUDIO
V_OUT
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
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