AD73322

a Low Cost, Low Power CMOS General-Purpose Dual Analog Front End AD73322 FUNCTIONAL BLOCK DIAGRAM AVDD1 AVDD2 DVDD 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 ␮s Typ per ADC Channel, 50 ␮s 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 GENERAL DESCRIPTION AD73322 VFBP1 VINP1 VINN1 VFBN1 VOUTP1 VOUTN1 REFOUT REFCAP VFBP2 VINP2 VINN2 VFBN2 VOUTP2 VOUTN2 ADC CHANNEL 1 SDI SDIFS DAC CHANNEL 1 SPORT REFERENCE SCLK SE RESET ADC CHANNEL 2 MCLK SDOFS DAC CHANNEL 2 SDO AGND1 AGND2 DGND 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-tooutput gain network in both the analog and digital domains. This is featured on both codecs and can be used for im...