AD73311LAR-REEL

Overview

The AD73311LAR-REEL is a low-cost, low-power CMOS general-purpose analog front-end processor manufactured by Analog Devices. It integrates a 16-bit A/D converter and a 16-bit D/A converter within a single package. The device operates on a single +3 V supply with maximum power consumption of 33 mW at 2.7 V. Key electrical specifications include a typical ADC signal-to-noise ratio (SNR) of 76 dB and a DAC SNR of 77 dB. It supports programmable input and output sample rates up to a maximum of 64 kS/s. The component features a flexible serial port interface allowing cascading of up to eight devices and includes an on-chip voltage reference.

Feature Summary

• Integrates 16-bit ADC and 16-bit DAC channels with 76 dB (ADC) and 77 dB (DAC) typical SNR.
• Supports programmable sampling rates up to 64 kS/s via digital sigma-delta modulation.
• Features programmable gain amplifiers: 0–38 dB range for ADC input and –15 to +6 dB range for DAC output.
• Includes on-chip bandgap voltage reference (1.2 V nominal) requiring only a 0.1 µF bypass 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 'REEL' suffix indicates tape-and-reel packaging rather than tube packaging when sourcing this specific variant. Confirm the 'A' grade designation ensures operation across the full industrial temperature range of -40°C to +105°C. Cross-reference the ordering guide to ensure the R-20 (SOIC) package option matches the required footprint, as other package variants like SSOP or TSSOP exist under different suffixes.

Selection Notes

Select this component for applications requiring high dynamic range in voice-band frequencies with minimal external filtering due to internal sigma-delta noise shaping. Ensure the host DSP can support the synchronous serial port timing requirements, specifically the MCLK and SCLK relationships. Consider the group delay characteristics (25 µs typ for ADC) if real-time latency is critical for active control loops. Verify that the single-supply architecture aligns with the system's power budget constraints.

Part Context

The AD73311L belongs to Analog Devices' family of general-purpose analog front-end processors designed for speech and telephony applications. The 'AR' in the part number denotes the SOIC-20 package option, while 'LARUZ' typically refers to the lead-free TSSOP variant; however, the datasheet confirms the base AD73311L functionality remains consistent across package types. This device serves as a complete codec solution, eliminating the need for separate ADC/DAC and amplifier stages in standard communication interfaces.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Engineers should verify pin compatibility and register-level software compatibility before substituting with other Analog Devices codecs or similar industry components.