LM1972 2-Channel Audio Attenuator – Datasheet

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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.

LM1972 Pinout

LM1972 Pin Configuration

Pin NoPin NameDescription
1GND ACGround AC Pin
2OUT 1Output Pin 1
3GND 1Ground Pin 1
4IN 1Input Pin 1
5GND ACGround AC Pin
6GND ACGround AC Pin
7VSS 2source supply 2
8LOGIC GNDLogic Ground Pin
9CLKClock Signal Pin
10LOAD/SHIFTLoad /Shift Pin
11DATA-INData Input Pin
12DATA-OUTData Output Pin
13VDD 1Drain supply 1
14GND ACGround AC Pin
15VDD 2Drain supply 2
16GND ACGround AC Pin
17OUT 2Output Pin 2
18VSS 1source supply 1
19GND 2Ground Pin 2
20IN 2Input Pin 2

LM1972 Specification & Features

  • Frequency response: 100 kHz (−3dB) (min)
  • Attenuation range (excluding mute): 78dB (typ)
  • Differential attenuation: ±0.25dB (max)
  • Signal-to-noise ratio (ref. 4 Vrms): 110dB (min)
  • Channel separation: 100dB (min)
  • 3-wire serial interface
  • Daisy-chain capability
  • 104dB mute attenuation
  • Pop and click free attenuation changes

Application

  • Automated studio mixing consoles
  • Music reproduction systems
  • Sound reinforcement systems
  • Electronic music (MIDI)
  • Personal computer audio control

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