LM1973
Description
The LM1973 is a digitally controlled 3-channel 76d B audio attenuator fabricated on a CMOS process. Each channel has attenuation steps of 0.5d B from 0d B- 15.5d B, 1.0d B steps from 16d B- 47d B, and 2.0d B steps from 48d B- 76d B, with a mute function attenuating 104d B. 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 96d B. Transitions between any attenuation settings are pop free. The LM1973’s 3-wire serial digital interface is TTL and CMOS patible; 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...
