AD73311LARU

Overview

The AD73311LARUZ is a single-channel analog front-end processor from Analog Devices, integrating a 16-bit ADC and a 16-bit DAC. It operates on a single +3 V supply with power consumption of 33 mW maximum at 2.7 V. The device supports programmable sampling rates up to 64 kS/s and features a flexible serial interface for DSP connectivity. Key performance metrics include 76 dB SNR for the ADC and 77 dB SNR for the DAC within voiceband frequencies. It includes an on-chip reference, programmable gain amplifiers, and digital filters, housed in a 20-lead TSSOP package.

Feature Summary

• Integrates a 16-bit ADC and 16-bit DAC with 76 dB/77 dB SNR respectively.
• Supports programmable sampling rates up to 64 kS/s via serial interface.
• Features programmable input/output gain ranges (ADC: 38 dB, DAC: 21 dB).
• Includes an on-chip bandgap voltage reference requiring only a 0.1 µF capacitor.

Applications

• Speech processing and enhancement systems.
• Telephony and cordless personal communications.
• Active control of sound and vibration.
• General purpose analog I/O interfaces.

Procurement Notes

Verify the specific suffix 'RU' corresponds to the TSSOP-20 package option when sourcing. Confirm the industrial temperature range (-40°C to +105°C) matches system requirements. Check current availability status as distribution may vary. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS technology.

Selection Notes

Select this component for applications requiring low group delay, specifically 25 µs for the ADC channel at 64 kHz. Consider the external digital filtering capabilities if further bandwidth reduction or SNR improvement is needed beyond the internal decimation filter. Verify that the host DSP can support the required serial clock timing and frame sync configurations for the SPORT interface.

Part Context

The AD73311L is part of Analog Devices' general-purpose analog front-end family designed for speech and telephony applications. The 'ARU' suffix indicates the specific package variant (TSSOP) and temperature grade. This model serves as a complete solution for converting analog voice signals to digital data and vice versa without requiring external amplifiers or references.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for current pin-compatible or functionally equivalent alternatives if this specific package or revision is discontinued.

FAQ

What is the maximum sample rate supported by the AD73311LARUZ?

The device supports a maximum sample rate of 64 kS/s, determined by the internal master clock divider settings.

How is the on-chip voltage reference configured?

The on-chip reference provides a nominal 1.2 V output. A 0.1 µF capacitor must be connected between the REFCAP pin and AGND2 to stabilize the reference voltage.

What is the typical group delay for the ADC channel?

The typical group delay for the ADC channel is 25 µs when operating at a 64 kHz output sample rate.