The LM1973 is a digitally controlled 3-channel 76dB audio attenuator fabricated on a CMOS
process. Each channel has attenuation steps of 0.5dB from 0dB–15.5dB, 1.0dB steps from 16dB–47dB,
and 2.0dB steps from 48dB– 76dB, 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 LM1973'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 LM1973 allows
multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be
routed for a given application.
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