GENERAL DESCRIPTION
The SSM2160 and SSM2161 allow digital control of volume for six and four channels, respectively, with a master level control. “Clicking” normally encountered with resistor-ladder attenuators is eliminated by using high performance Voltage Controlled Amplifiers (VCAs) in the signal path. The VCA control ports are driven by DACs with controlled output rate-of-change to insure noiseless volume changes. Each channel is controlled by a dedicated 5-bit DAC, providing 32 steps of adjustment.
FEATURES
Digitally-Controlled “Clickless” Level Adjustment
SSM2160: Six Channels
SSM2161: Four Channels
Master Control has 128 1 dB Steps
Each Channel has 32 1 dB Steps
Step Sizes Can Be Changed Using External Resistors
High Gain Accuracy
100 dB Gain Range
Power On Mute
Excellent Audio Characteristics:
–100 dBu SNR (0 dBu = 0.775 V rms, VS = ±5 V)
+10 dBu Headroom (VS = ±5 V)
0.008% THD+N (@ 1 kHz, VIN = –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