AD73311LARUZ

Overview

The AD73311LARUZ is a low-cost, low-power CMOS general-purpose analog front-end processor manufactured by Analog Devices Inc. It integrates a 16-bit A/D conversion channel and a 16-bit D/A conversion channel within a single package. The device supports programmable input/output sample rates up to 64 kS/s and features an on-chip reference voltage for single-supply operation. Key electrical specifications include a maximum ADC signal-to-noise ratio of 75 dB and a DAC SNR of 70 dB over the voiceband. It operates on a single supply ranging from +2.7 V to +5.5 V with a maximum power consumption of 50 mW at 2.7 V.

Feature Summary

• Integrates 16-bit ADC and 16-bit DAC channels with sigma-delta modulation architecture.
• Supports flexible serial port (SPORT) allowing up to 8 devices to be connected in cascade.
• Features programmable gain amplifiers with ranges of 38 dB for ADC and 21 dB for DAC.
• Includes an on-chip reference voltage to facilitate single-supply operation.

Applications

• Speech processing systems
• Cordless and personal communications devices
• Telephony equipment
• Active control of sound and vibration

Procurement Notes

Verify the specific suffix 'LARUZ' against official documentation, as standard listings typically utilize 'ARZ' or 'ARSZ'. Confirm current availability status directly with Analog Devices or authorized distributors, as older component lines may have limited stock or discontinuation notices. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS technology.

Selection Notes

Select this component for applications requiring high-resolution audio or telephony signal processing with minimal external filtering. The sigma-delta architecture reduces the need for complex antialias filters. Consider the 64 kS/s maximum sample rate and the specific SNR requirements for your bandwidth. Verify that the serial interface timing aligns with the host DSP engine capabilities.

Part Context

The AD73311 is part of Analog Devices' family of general-purpose analog front-ends designed for speech and telephony applications. It serves as a complete solution for converting analog signals to digital and vice versa, eliminating the need for separate ADC and DAC components. The device is suitable for embedded systems where space and power consumption are critical constraints.

Replacement Considerations

Direct replacements include the AD73311ARZ (SOIC package) and AD73311ARSZ (SSOP package). Verify pin compatibility and electrical specifications before substitution. Note that package dimensions differ between SOIC and SSOP variants, requiring PCB layout adjustments if changing package types.

FAQ

What is the maximum sample rate supported by the AD73311?

The AD73311 supports a maximum sample rate of 64 kS/s for both the ADC and DAC channels.

How does the AD73311 handle noise shaping?

It employs sigma-delta modulation techniques, including oversampling and noise shaping, to push quantization noise out of the band of interest, which is then removed by a digital decimation filter.

Can multiple AD73311 devices be used together?

Yes, the flexible serial port allows up to 8 AD73311 devices to be connected in cascade for multi-channel applications.