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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