GENERAL DESCRIPTION
The AD74322 is a front-end processor for general purpose audio and voice applications. It features two multi-bit Σ∆ A/D conversion channels and two multi-bit Σ∆ D/A conversion channels. Each ADC channel provides >85 dB signal-to-noise ratio while each DAC channel provides >90 dB, both over an audio signal bandwidth.

FEATURES
   2.5V Stereo Audio Codec with 3.3 V Tolerant Digital Interface
   Supports 96 kHz Sample Rates
   Supports 16/18 /20/24-Bit Word Lengths
   Multibit Sigma Delta Modulators with
     “Perfect Differential Linearity Restoration” for Reduced Idle Tones and Noise Floor
   Data Directed Scrambling DACs - Least Sensitive to Jitter
   Performance (20 Hz to 20 kHz)
      90 dB ADC and DAC SNR
   Digitally Programmable Input/Output Gain
   On-chip Volume Controls Per Output Channel
   Hardware and Software Controllable Clickless Mute
   Supports 256xFs, 512xFs and 768xFs Master Mode Clocks
   Master Clock Pre-Scaler for use with DSP master clocks
   Flexible Serial Data Port with Right-Justified, Left
   Justified, I2S-Compatible and DSP Serial Port Modes
   Supports Packed Data Mode (“TDM”) for cascading devices.
   On-Chip Reference
   16, 20 and 24-Lead SOIC, SSOP and TSSOP Package options.

APPLICATIONS
   Digital Video Camcorders (DVC)
   Portable Audio Devices (Walkman etc)
   Audio Processing
   Voice Processing
   Conference Phones
   General Purpose Analog I/O