AD73311LARS

Overview

The AD73311LARS 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 converter and a 16-bit D/A converter within a single 20-lead Shrink Small Outline Package (SSOP). The device operates on a single +3 V supply with power consumption of 33 mW maximum at 2.7 V. It features programmable input and output sample rates up to 64 kS/s, an on-chip reference voltage, and a flexible serial port supporting cascaded connections. Key performance metrics include 76 dB ADC SNR and 77 dB DAC SNR over voiceband bandwidth.

Feature Summary

• Integrates 16-bit ADC and 16-bit DAC channels with sigma-delta modulation architecture
• Programmable gain amplifiers offer 38 dB range for ADC and 21 dB range for DAC
• Flexible serial port allows connection of up to eight devices in cascade
• On-chip bandgap reference provides 1.2 V nominal output for single-supply operation

Applications

• Speech processing and enhancement
• Cordless and personal communications systems
• Telephony applications including low bit rate compression
• Active control of sound and vibration

Procurement Notes

Verify the specific package suffix 'RS' corresponds to the SSOP-20 form factor required for the design. Confirm the industrial temperature grade (-40°C to +105°C) meets environmental specifications. Check current availability status as distribution may vary. Ensure the host DSP interface timing aligns with the SPORT requirements defined in the datasheet.

Selection Notes

Select this component when a complete analog front-end solution is needed for speech or telephony applications requiring 16-bit resolution. The AD73311LARS is suitable for designs constrained by single 3 V supply voltage. Consider the group delay characteristics (25 µs typical for ADC) if real-time active control is required. Verify that the external digital filtering capabilities of the host processor can complement the internal decimation/interpolation filters for optimal noise performance.

Part Context

The AD73311LARS belongs to the AD73311L family of analog front-end processors. The 'RS' ordering suffix specifically denotes the Shrink Small Outline Package (SSOP) with 20 leads. Other variants in the family include the SOIC (R) and TSSOP (RU) packages, which share identical electrical specifications but differ in physical footprint and thermal impedance.

Replacement Considerations

Direct pin-compatible replacements within the same package type are limited due to the specific legacy nature of this component. Designers should evaluate the AD73311LARUZ (TSSOP) if package adaptation is possible, noting the change from SSOP to TSSOP. No other Analog Devices part numbers are confirmed as direct functional substitutes without schematic modification.