GENERAL DESCRIPTION

The AD73322 is a dual front-end processor for general-purpose applications including speech and telephony. It features two 16-bit A/D conversion channels and two 16-bit D/A conversion channels. Each channel provides 77␣ dB signal-to-noise ratio over a voiceband signal bandwidth. It also features an input-to output gain network in both the analog and digital domains. This is featured on both codecs and can be used for impedance matching or scaling when interfacing to Subscriber Line Interface Circuits (SLICs).

FEATURES

  Two 16-Bit A/D Converters

  Two 16-Bit D/A Converters

  Programmable Input/Output Sample Rates

  78 dB ADC SNR

  77 dB DAC SNR

  64 kS/s Maximum Sample Rate

  –90 dB Crosstalk

  Low Group Delay (25 μs Typ per ADC Channel, 50 μs Typ per DAC Channel)

  Programmable Input/Output Gain

  Flexible Serial Port which Allows Up to Four Dual

     Codecs to be Connected in Cascade Giving Eight

     I/O Channels

  Single (+2.7 V to +5.5 V) Supply Operation

  73 mW Typ Power Consumption at 3.0 V

  On-Chip Reference

  28-Lead SOIC and 44-Lead LQFP Packages

APPLICATIONS

  General Purpose Analog I/O

  Speech Processing

  Cordless and Personal Communications

  Telephony

  Active Control of Sound and Vibration

  Data Communications

  Wireless Local Loop