LM1971M/NOPB

Audio Special Purpose Overview

The LM1971M/NOPB is a digitally controlled audio volume control IC from Texas Instruments' Overture series. It features an 8-bit interface for precise attenuation adjustment, offering a total range of 62 dB with 1 dB steps. The device operates on a single supply voltage between 4.5 V and 12 V and supports SPI communication. Designed for surface mount assembly in an 8-SOIC package, it functions within a temperature range of -40°C to 85°C. Key electrical specifications include a maximum frequency of 100 kHz and an impedance of 40 kOhms.

Audio Special Purpose Feature Summary

• Digitally controlled volume adjustment with 62 dB total attenuation range
• 8-bit resolution providing 1 dB step size per channel
• SPI digital interface for control signals
• Operates on a single 4.5 V to 12 V power supply

Audio Special Purpose Applications

• Communication Systems
• Audio Volume Control Circuits

Audio Special Purpose Procurement Notes

Verify the package type against specific ordering requirements. While some distributor listings indicate tube packaging, other sources may list tape-and-reel options. Confirm the exact shipping configuration (Tube vs. Reel) with the supplier prior to purchase to ensure compatibility with automated assembly equipment or manual placement processes.

Audio Special Purpose Selection Notes

Select this component when a single-channel, digitally adjustable attenuator is required for audio applications. Ensure the system design accommodates the 40 kOhm impedance and 100 kHz maximum operating frequency. Verify that the host controller supports the necessary SPI protocol for bit-level attenuation control within the specified voltage and temperature ranges.

Audio Special Purpose Part Context

This part belongs to the Overture series of audio special purpose ICs by Texas Instruments. It serves as a dedicated solution for managing audio signal levels in embedded systems where digital control over analog attenuation is necessary, replacing mechanical potentiometers with solid-state alternatives.

Audio Special Purpose Replacement Considerations

The LM1971M is the lead-free version of the LM1971M. Check datasheets for functional equivalents if pinout or interface compatibility differs. No direct public substitute part numbers are confirmed in the provided source material.