A Stereo Digital Volume Control based on the CS3310

                The CS3310 is a complete stereo digital volume control designed specifically for audio systems. It features a 16-bit serial interface that controls two independent, low-distortion audio channels.

Fig. 1 The CS3310 Block Diagram

   Electrical performances are very good....compared to a standard, passive dual potentiometer.

Fig. 2 The CS3310 Frequency Response

    To work correctly the CS3310 requires a SPI^TM or MicroWire^TM type serial interface and therefore a firmware based design.

Fig. 3  The Block Diagram

Fig. 4 The SPI Format

To explore the CS3310 capabilities  I have choose the PIC16F84A  by Microchip, a RISC based 8-bit FLASH mC .

   Following the recommended connections by Crystal, the simple schematic above shown was realized.

Fig 5 The Full Schematic (click on it to enlarge)

    The firmware is based on the following simplified flow-chart.

Fig. 6 The Firmaware Flowchart (click on it to enlarge)

Available a pre-programmed 16F84A. 

References:

       [1] Interfacing the CS5525/6/9 to the PIC16F84, Keith Coffey, AN88 Crystal

       [2] http://www.jeffrowland.com/techtalk.htm

      SPI^TM is a trademark of Motorola.

      MicroWire^TM  is a trademark of National Semiconductor.