Dual Low Power Cmos Analog Front End With Dsp Microcomputer - Analog Devices

The AD73422 is a single device incorporating a dual Analog front end and a microcomputer optimized for digital signal processing (DSP) and other high speed numeric processing applications. The AD73422s Analog front end (AFE) section features a dual front-end converter for general purpose applications including speech and Telephony The AFE section 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 match- ing or scaling when interfacing to Subscriber Line Interface Circuits (SLICs). The AD73422 is particularly suitable for a variety of applica- tions 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 AFE 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 38 dB and 21 dB respectively. An on-chip reference voltage is included to allow single supply operation. The sampling rate of the AFE is programmable with four sepa- rate settings offering 64, 32, 16 and 8 kHz sampling rates (from a master Clock of 16.384 MHz), while the serial port (SPORT2) allows easy expansion of the number of I/O channels by cascad- ing extra AFEs external to the AD73422. The AD73422s DSP engine combines the ADSP-2100 family base architecture (three computational units, data address gen- erators and a program sequencer) with two serial ports, a 16-bit internal DMA port, a byte DMA port, a programmable Timer Flag I/O, extensive interrupt capabilities and on-chip program and data memory. The AD73422-80 integrates 80K bytes of on-chip memory configured as 16K words (24-bit) of program RAM, and 16K words (16-bit) of data RAM. The AD73422-40 integrates 40K bytes of on-chip memory configured as 8K words (24-bit) of program RAM, and 8K words (16-bit) of data RAM. Power- down circuitry is also provided to meet the low power needs of battery operated portable equipment. The AD73422 is available in a 119-ball PBGA package. By Analog Devices, Inc.
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