LM1972N

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1. Description

The LM1972N 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.

2. Features

    1. 3-wire serial interface

    2. Daisy chain function

    3. 104dB mute attenuation

    4. Pop-up and click free attenuation changes

3. Application

    1. Automatic studio mixing console

    2. Music reproduction system

    3. Sound enhancement system

    4. Electronic Music (MIDI)

    5. PC audio control

4. Main specifications

    1. Total harmonic distortion + noise: 0.003% (maximum)

    2. Frequency response: 100 kHz (−3dB) (minimum)

    3. Attenuation range (excluding mute): 78 dB (typical value)

    4. Differential attenuation: ±0.25 dB (maximum)

    5. Signal-to-noise ratio (reference 4 Vrms): 110 dB (minimum)

    6. Channel separation: 100 dB (minimum)

5. Pin configuration

6. Product overview