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