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.
● 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): 76 dB (typ)
● Differential attenuation: ±0.25 dB (max)
● Signal-to-noise ratio (ref. 4 Vrms): 110 dB (min)
● Channel separation: 110 dB (typ)
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