LM1972MX/NOPB.pdf
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The LM1972MX/NOPB is a digitally controlled 2-channel audio attenuator developed by Texas Instruments. Built on a CMOS process, it provides a smooth logarithmic attenuation curve for high-quality audio volume control, with pop-and-click-free transitions between settings.
Each channel supports a typical attenuation range of 78 dB (excluding mute), offering 0.5 dB steps from 0 dB to −47.5 dB and 1.0 dB steps from −48 dB to −78 dB. The integrated mute function can deliver up to 104 dB attenuation, effectively disconnecting the input from the output when required.
The LM1972MX/NOPB is controlled via a 3-wire serial digital interface that is compatible with TTL and CMOS logic. Its daisy-chain capability allows multiple devices to be linked on the same control bus, helping reduce routing complexity in multi-channel audio systems. The MX device option is commonly supplied in compact 8-pin package variants suitable for dense PCB layouts.
Fine step resolution (0.5 dB / 1.0 dB) enables granular level adjustment for premium audio paths, supporting consistent channel tracking and smooth listening experience.
Designed to minimize audible artifacts when changing attenuation settings, making it a strong fit for studio, consumer and computer-audio volume control.
The 3-wire serial interface is easy to drive from a microcontroller, while data-out support allows multiple µPots to be chained to reduce control line count.
The built-in mute function provides up to 104 dB attenuation, supporting reliable silent switching and input disconnection during mode changes or power sequencing.
TTL/CMOS compatible 3-wire serial control selects channel and attenuation level, simplifying integration into MCU-based audio controllers.
Data-out supports chaining multiple devices to control multi-channel audio systems while reducing enable and data routing complexity.
Excellent SNR, low THD+N, and high channel separation help preserve audio quality in music reproduction, mixing and sound reinforcement designs.
| Parameter | Value / Condition |
|---|---|
| Function | Digitally controlled audio attenuator (µPot) |
| Number of Channels | 2 |
| Attenuation Range (excluding mute) | 78 dB typ. |
| Attenuation Steps | 0.5 dB steps (0 to −47.5 dB), 1.0 dB steps (−48 to −78 dB) |
| Mute Attenuation | 104 dB |
| Interface | 3-wire serial digital interface (TTL/CMOS compatible) |
| THD + Noise | 0.003% max (typical datasheet specification) |
| Frequency Response | 100 kHz (−3 dB) min |
| Signal-to-Noise Ratio | 110 dB min (ref. 4 Vrms) |
| Channel Separation | 100 dB min |
| Base Product Number | LM1972 |
| Manufacturer | Texas Instruments |
| Package | 8-pin package (MX option; commonly SOIC-8 / MSOP-8 variants) |
Alternatives to the LM1972MX/NOPB may include other digitally controlled audio attenuators (µPots) with similar step size, attenuation range and interface requirements, such as:
When selecting a replacement, verify channel count, control protocol timing, total attenuation range, and audio performance (THD+N, SNR, channel separation).
Texas Instruments is a global leader in analog and embedded processing technologies. TI's audio portfolio includes precision volume controls, interface ICs, amplifiers and signal chain solutions widely used in professional audio, consumer electronics and industrial systems.
The LM1972 family is commonly chosen for designs that require reliable digital volume control with excellent audio fidelity and straightforward MCU integration.
Provides precise, repeatable attenuation control for multi-channel studio systems requiring smooth, pop-free level changes.
Used for high-fidelity volume control in home and professional playback equipment where low distortion and high SNR are important.
Supports digital control of analog audio paths in PA and reinforcement systems, helping simplify UI control and system integration.
Ideal for computer audio control and electronic music equipment where microcontroller-driven volume adjustment is required.
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Our experienced QC team strictly verifies and tests LM1972MX/NOPB. Only qualified suppliers who pass our audit can list LM1972MX/NOPB on OEM STOCK GLOBAL LIMITED. We pay close attention to sourcing channels and product quality so you can purchase with confidence.
Pricing and inventory for LM1972MX/NOPB fluctuate and are updated periodically (typically within 24 hours). Quotations generally remain valid for 5 days unless otherwise stated.
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We perform Pre-Shipment Inspection (PSI) on randomly selected units before shipping. If there is an issue with LM1972MX/NOPB, returns/replacements are accepted when:
Steps: (1) Inform us within 90 days; (2) Obtain Return Authorization (RMA) before sending items back.
Please contact us for technical documents and support related to Texas Instruments LM1972MX/NOPB, including pin diagrams and datasheets. Our team will respond promptly.
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