ADI AD73322LARUZ

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). The AD73322 is particularly suitable for a variety of applications in the speech and telephony area, including low bit rate, high quality compression, speech enhancement, recognition, and synthesis. The low group delay characteristic of the part makes it suitable for single or multichannel active control applications. The A/D and D/A conversion channels feature programmable input/output gains with ranges of 38 dB and 21 dB respectively. An on-chip reference voltage is included to allow single-supply operation. This reference is programmable to accommodate either 3V or 5V operation. The sampling rate of the codecs is programmable with four separate settings, offering 64 kHz, 32 kHz, 16 kHz and 8 kHz sampling rates (from a master clock of 16.384 MHz). A serial port (SPORT) allows easy interfacing of single or cascaded devices to industry standard DSP engines. The SPORT transfer rate is programmable to allow interfacing to both fast and slow DSP engines. The AD73322 is available in 28-lead SOIC and 44-lead LQFP packages.

• 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 kSPS 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

• General Purpose Analog I/O
• Speech Processing
• Cordless and Personal Communications
• Telephony
• Active Control of Sound and Vibration
• Data Communications
• Wireless Local Loop