AD73322AST

Overview

The AD73322AST is a low-cost, low-power CMOS dual analog front-end processor from Analog Devices. It integrates two 16-bit A/D converters and two 16-bit D/A converters within a single chip. The device supports programmable input/output sample rates up to 64 kS/s and features an on-chip reference for single-supply operation. Operating from a +2.7 V to +5.5 V supply, it consumes approximately 73 mW at 3.0 V. The component utilizes a flexible serial port (SPORT) interface, allowing up to four devices to be connected in cascade for expanded I/O channels. It is housed in a 44-lead Plastic Thin Quad Flatpack (LQFP) package.

Feature Summary

• Dual 16-bit ADCs and Dual 16-bit DACs with 78 dB SNR for ADC and 77 dB SNR for DAC
• Programmable sample rates of 64 kHz, 32 kHz, 16 kHz, and 8 kHz
• Flexible SPORT interface supporting cascading of up to four dual codecs
• On-chip reference voltage with programmable output levels

Applications

• General purpose analog I/O systems
• Speech processing and telephony applications
• Active control of sound and vibration
• Cordless and personal communications devices

Procurement Notes

Verify the specific ordering suffix AST corresponds to the 44-lead LQFP package and industrial temperature range (-40°C to +85°C). Confirm that the required documentation matches the REV B datasheet specifications. Ensure compatibility with the target DSP engine's serial port timing requirements before integration.

Selection Notes

Select this component when a dual-channel 16-bit audio front end is required with low power consumption. The AD73322AST is suitable for designs needing cascaded configurations to increase channel count. Verify that the system clock can provide the necessary 16.384 MHz master clock input for the specified sampling rates.

Part Context

The AD73322 series serves as a general-purpose analog front-end processor designed for speech and telephony applications. The AST variant specifically denotes the 44-lead LQFP package option, distinguishing it from the 28-lead SOIC version. This family allows for impedance matching and scaling via programmable gain networks in both analog and digital domains.

Replacement Considerations

The AD73322AR is a pin-compatible alternative available in a 28-lead SOIC package. Both variants share identical electrical specifications and functionality but differ in physical footprint and thermal characteristics.