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LM1972M/NOPB

Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute

Packaging

Package | PIN: DW | 20
Temp: C (0 to 70)
Carrier: Partial Tube
Qty Price
1-9 $4.74
10-24 $4.27
25-99 $3.98
100-249 $3.57
250-499 $3.33
500-749 $2.90
750-999 $2.51
1000+ $2.46

Features

  • 3-Wire Serial Interface
  • Daisy-Chain Capability
  • 104dB Mute Attenuation
  • Pop and Click Free Attenuation Changes

Key Specifications

  • Total Harmonic Distortion +
    Noise: 0.003 % (max)
  • Frequency response: 100 kHz (−3dB) (min)
  • Attenuation range (excluding
    mute): 78 dB (typ)
  • Differential attenuation: ±0.25 dB (max)
  • Signal-to-noise ratio
    (ref. 4 Vrms): 110 dB (min)
  • Channel separation: 100 dB (min)

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Texas Instruments  LM1972M/NOPB

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.