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LM1971 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM1971 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 11 page  LM1971 Overture™ Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute General Description The LM1971 is a digitally controlled single channel audio at- tenuator fabricated on a CMOS process. Attenuation is vari- able in 1 dB steps from 0 dB to −62 dB. A mute function dis- connects the input from the output, providing over 100 dB of attenuation. The performance of the device is exhibited by its ability to change attenuation levels without audible clicks or pops. In addition, the LM1971 features a low Total Harmonic Distor- tion (THD) of 0.0008%, and a Dynamic Range of 115 dB, making it suitable for digital audio needs. The LM1971 is available in both 8-pin plastic DIP or SO packages. The LM1971 is controlled by a TTL/CMOS compatible 3-wire serial digital interface. The active low LOAD line enables the data input registers while the CLOCK line provides system timing. Its DATA pin receives serial data on the rising edge of each CLOCK pulse, allowing the desired attenuation setting to be selected. Key Specifications n Total harmonic distortion 0.0008% (typ) n Frequency response > 200 kHz (−3 dB) (typ) n Attenuation range (excluding mute) 62 dB (typ) n Dynamic range 115 dB (typ) n Mute attenuation 102 dB (typ) Features n 3-wire serial interface n Mute function n Click and pop free attenuation changes n 8-pin plastic DIP and SO packages available Applications n Communication systems n Cellular Phones and Pagers n Personal computer audio control n Electronic music (MIDI) n Sound reinforcement systems n Audio mixing automation Typical Application Overture™ is a trademark of National Semiconductor Corporation. DS012353-1 FIGURE 1. Typical Audio Attenuator Application Circuit May 1999 © 1999 National Semiconductor Corporation DS012353 www.national.com |
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