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Cirrus Logic, Inc. - CS3308
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8-channel Analog Volume Control IC with 123dB Dynamic Range

Model: CS3308

  • Complete analog volume control
  • 8 Independently controllable channels
  • 3 Configurable master volume and muting controls
  • Wide adjustable volume range
  • -96dB to +22dB in ¼dB steps
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The CS3308 is an 8-channel digitally controlled analog volume control designed specifically for high-end audio systems. It features a comprehensive I²C/SPI serial control port for easy device and volume configuration. The CS3308 includes arrays of well-matched resistors and complementary low-noise active output stages. A total adjustable range of 118 dB, in ¼ dB steps, is spread evenly over 96 dB of attenuation and 22 dB of gain. The CS3308 implements configurable zero-crossing detection to provide glitch-free volume-level changes. The I²C/SPI control interface provides for easy system integration of up to 128 CS3308 devices over a single 2-wire I²C or 3-wire SPI bus, allowing many channels of volume control with minimal system controller I/O requirements. Devices may be controlled on an individual and grouped basis, simplifying simultaneous configuration of a group of channels across multiple devices, while allowing discrete control over all channels on an individual basis. The device operates from ±5 V analog supplies and has an input/output voltage range of ±3.65 V. The digital control interface operates at +3.3V.

  • Complete analog volume control
  • 8 Independently controllable channels
  • 3 Configurable master volume and muting controls
  • Wide adjustable volume range
  • -96dB to +22dB in ¼dB steps
  • Low distortion and noise
  • -112db THD+N
  • 123db dynamic range
  • Noise-free level transitions
  • Zero-crossing detection with programmable time-out
  • Low channel-to-channel crosstalk
  • 120db inter-channel isolation
  • Comprehensive serial control port
  • Supports I²C® and SPI communication
  • Independent control of up to 128 devices on a shared 2-wire I²C or 3-wire SPI control bus
  • Supports individual and grouped control of all cs3308 devices on the I²C or SPI control bus
 
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