AD73311LARS-REEL7

Overview

The AD73311L is a low-cost, low-power CMOS general-purpose analog front-end processor featuring integrated 16-bit A/D and D/A conversion channels. Operating on a single +3 V supply, it delivers 76 dB ADC SNR and 77 dB DAC SNR within the voiceband (300 Hz to 3400 Hz). The device supports programmable sampling rates up to 64 kS/s and includes programmable gain amplifiers with ranges of 38 dB for input and 21 dB for output. It utilizes a sigma-delta architecture with an on-chip 1.2 V reference and communicates via a flexible serial port compatible with standard DSP engines.

Feature Summary

• Integrated 16-bit ADC and DAC with 76/77 dB SNR in voiceband
• Programmable sampling rates from 8 kHz to 64 kHz
• Single +3 V supply operation with 33 mW max power consumption at 2.7 V
• On-chip bandgap voltage reference (1.2 V) requiring only a 0.1 µF capacitor

Applications

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

Procurement Notes

Verify the specific package suffix against the Ordering Guide: 'R' denotes SOIC, 'RS' denotes SSOP, and 'RU' denotes TSSOP. Confirm the temperature range is Industrial (-40°C to +105°C). Ensure the REFCAP pin is connected to AGND2 with a 0.1 µF capacitor as required for the internal reference circuitry.

Selection Notes

Select based on required package type (SOIC, SSOP, or TSSOP) and interface compatibility with the host DSP. Consider the group delay specifications (25 µs typical per channel) when designing active control loops. Verify that the external master clock (MCLK) frequency allows for the desired decimation ratio to achieve the target sample rate.

Part Context

The AD73311L is part of Analog Devices' general-purpose analog front-end family designed for speech and telephony applications. It integrates signal conditioning, conversion, and digital filtering into a single chip, reducing the component count compared to discrete solutions. The device is suitable for applications requiring high-quality audio processing with minimal external components.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.