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LM1973M Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM1973M Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LM1973 µPot™3-Channel 76dB Audio Attenuator with Mute General Description 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 at- tenuation curve can be customized through software to fit the desired application. The performance of a µPot™ is demonstrated through its ex- cellent 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 at- tenuation 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 Total Harmonic Distortion + Noise: 0.003% (max) n Frequency response: 100 kHz (−3dB) (min) n Attenuation range (excluding mute): 76dB (typ) n Differential attenuation: ±0.25dB (max) n Signal-to-noise ratio (ref. 4 Vrms): 110dB (min) n Channel separation: 110dB (typ) Features n 3-wire serial interface n Daisy-chain capability n 104dB mute attenuation n Pop and click free attenuation changes Applications n Automated studio mixing consoles n Music reproduction systems n Sound reinforcement systems n Electronic music (MIDI) n Personal computer audio control Typical Application Connection Diagram µPot™ and Overture™ are trademarks of National Semiconductor Corporation. DS011958-1 FIGURE 1. Typical Audio Attenuator Application Circuit Dual-In-Line Plastic or Surface Mount Package DS011958-2 Top View Order Number LM1973M or LM1973N See NS Package Number M20B or N20A December 1994 © 1999 National Semiconductor Corporation DS011958 www.national.com |
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