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LM1972 Digital Attenuator Series
tiAttenuators - ICs
The LM1972 series from Texas Instruments is a lineup of digital attenuators designed for precise control over signal levels in audio and communication systems. These ICs are particularly useful in applications requiring high dynamic range and fine-tuned signal attenuation, such as audio mixing consoles, telecommunications equipment, and test and measurement instruments.
One thing worth noting is how these attenuators offer a wide range of attenuation, typically from 0 to 62 dB in single-channel versions and up to 124 dB in dual-channel configurations. This makes them incredibly versatile for various scenarios where you need to adjust signal levels without introducing unwanted noise or distortion. Engineers tend to reach for this when they require a high degree of precision and flexibility in their design, especially in systems where signal strength needs to be dynamically adjusted based on input conditions.
Another practical application is in audio systems, where the ability to mute signals while still maintaining the integrity of the circuit is crucial. The mute function in these ICs allows for seamless switching between different signal sources without any audible pops or clicks, making them ideal for professional audio setups.
Overall, the LM1972 series provides a robust solution for anyone needing precise, digitally controlled attenuation in their design. With its wide range of options and excellent performance characteristics, it’s a go-to component for many engineers tackling complex signal processing tasks.
Frequently Asked Questions
LM1972 Digital Attenuator - Part List
8 parts in total| Mfr Part # | Quantity Available | Price | Category | Packaging | Mounting Type | Standard Package | RoHS | Number of Bits | Attenuation - Typ | Number of Channels | Width | Package / Case | Package Quantity | Number of Positions | Supplier Device Package | Type | Applications | Operating Temperature | Factory Pack Quantity | Standard Package Name | Part Status | Crosstalk | Frequency - Max | Frequency - Min | Current - Supply | Voltage - Supply | Power Supply Type | Noise - 10Hz to 10kHz | Power Dissipation (Max) | Dynamic Range, ADCs / DACs (db) Typ | Lead Style | Mounting Style | Length - Overall | Shell Size - Insert | Series | Features | Software | Utilized IC / Part | Printed Circuit Board | Temperature - Test | Other Names | EU RoHS | Impedance | Manufacturer | Package Cooled | Rad Hardened | Power - Rated | Current - Output | Technology | Operating Temperature - Junction | SVHC | Tariff No | Voltage Rating | Voltage - Supply (Min) | Height | Length | Weight | Number of Pins | Material Finish | Size / Dimension | Controller Type | Control Interface | Standard Pack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 LM1972MX/NOPB SO T/R 2-CHAN AUDIO ATTENUATOR Digital Attenuator 104dB Attenuation 20-Pin SOIC W T/R Digital Attenuator 104dB Attenuation 20-Pin SOIC T/R IC AUDIO ATTENUATR W/MUTE 20SOIC Active Attenuator Micro-Pot 2CH 78dB Audio Attenuator Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute Attenuators Micro-Pot 2CH 78dB Audio Attenuator texas instruments | 38 | 1: ¥18.9525 | - | Tape and Reel | Surface Mount | Cut Tape | Lead free / RoHS Compliant | 16 | 78 dB | 2 | 7.6(Max) | 20SOIC W | SOIC | 20 | 20-SOIC | Audio Attenuator | Consoles, MIDI | 0 C | 1000 | SOIC | ACTIVE | -110 | 3 MHz | 2 MHz | 0.004 | 4.5 to 12 V | 4.5 to 15 | 0.0008 | 150 | 115 | Gull-wing | SMD/SMT | 13(Max) | 2.35(Max) | LM1972 | 2 Channels, Digitally controlled audio attenuator | SNAS094D | View | 20 | 0 to 70 | LM1972MX/NOPBCT | Compliant | 40 kOhms | Texas Instruments | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
LM1972M Digital Attenuator 104dB Attenuation 20-Pin SOIC W Rail Digital Attenuator 104dB Attenuation 20-Pin SOIC Rail IC AUDIO ATTENUATR W/MUTE 20SOIC Attenuators - ICs Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute Attenuators Digitally Cntrl 62dB Audio Attenuator texas instruments | 87 | 1: ¥43.928 | - | Rail | Surface Mount | Rail / Tube | Contains lead / RoHS non-compliant | 16 | 0.5/1 dB | 2 | 7.6(Max) | 20SOIC W | SOIC | 20 | 20-SOIC | Audio Attenuator | Consoles, MIDI | Commercial | 36 | SOIC | ACTIVE | -110 | 3 MHz | 2 MHz | 0.004 | 4.5 to 12 V | 4.5 to 15 | 0.0008 | 150 | 115 | Gull-wing | SMD/SMT | 13(Max) | 2.35(Max) | LM1972 | 2 Channels, Digitally controlled audio attenuator | SNAS094D | View | 20 | 0 to 70 | - | - | - | Texas Instruments | SOIC W | No | 0.15 W | 4 mA | Silicon | 70C | - | - | - | - | - | - | - | - | - | - | - | - | - |
LM1972M/NOPB . LM1972M/NOPB - Audio Volume Control 2 Channel 20-SOIC from Texas Instruments. from now! Texas Instruments Incorporated | 198 | 1: ¥36.24 | - | Tube | Surface Mount | Rail / Tube | Lead free / RoHS Compliant | 16 | 78dB | 2 | 7.595mm | 20SOIC W | 36 | TUBE | 20 | 20-SOIC | Audio Attenuator | Consoles, MIDI | +70 °C | 36 | - | ACTIVE | -110 | 3MHz | 2 MHz | - | 4.5 to 12 V | 4.5 to 15 | 0.0008 | - | 115 | - | SMD/SMT | - | - | LM1972 | 2 Channels, Digitally controlled audio attenuator | SNAS094D | View | - | 0 to 70 | - | - | 40 kOhms | - | NS | - | - | - | - | - | :No SVHC (16-Dec-2013) | 85423990 | 4.5 V | 12 V | 2.286mm | 13.005mm | 0.000789 | :20 | :MSL 3 - 168 hours | 13.005 x 7.595 x 2.286mm | :Attenuator | :Serial | - |
 | 0 | - | Rail | Through Hole | - | - | 16 | 104(Typ) | 2 | 6.6 | - | PDIP | 20 | - | - | - | 70 | - | PDIP | - | - | - | - | 0.004 | - | - | - | 150 | - | Through Hole | - | 26.42(Max) | 3.3 | - | - | - | - | 20 | - | - | Compliant | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
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 | 0 | - | Tube | Through Hole | 18 | - | - | - | - | - | 20-DIP (0.300", 7.62mm) | - | - | 20-DIP | Audio Attenuator | Consoles, MIDI | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | *LM1972N | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
LM1972MNOPB None The LM1972 is a digitally controlled 2-channel 78dB audio attenuator fabricated on a CMOS process. Each channel has attenuation steps of 0.5dB from 0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a mute function attenuating 104dB. Its logarithmic attenuation curve can be customized through software to fit the desired application. The performance of a μPot is demonstrated through its excellent Signal-to-Noise Ratio, extremely low (THD+N), and high channel separation. Each μPot contains a mute function that disconnects the input signal from the output, providing a minimum attenuation of 96dB. Transitions between any attenuation settings are pop free. The LM1972's 3-wire serial digital interface is TTL and CMOS compatible; receiving data that selects a channel and the desired attenuation level. The Data-Out pin of the LM1972 allows multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be routed for a given application. Product Highlights: 3-wire serial interface Daisy-chain capability 104dB mute attenuation Pop and click free attenuation changes Potential Applications: Automated studio mixing consoles Music reproduction systems Sound reinforcement systems Electronic music (MIDI) Personal computer audio control Texas Instruments Incorporated | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 36 | |
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