GENERAL DESCRIPTION
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. Key Specifications n n n n n n Total Harmonic Distortion + Noise: 0.003% (max) Frequency response: 100 kHz (−3dB) (min) Attenuation range (excluding mute): 76dB (typ) ± 0.25dB (max) Differential attenuation: Signal-to-noise ratio (ref. 4 Vrms): 110dB (min) Channel separation: 110dB (typ) FEATURES
n n n n 3-wire serial interface Daisy-chain...
National Semiconductor
