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LM1973 bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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LM1973 bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 21 page LM1973 www.ti.com SNAS093B – DECEMBER 1994 – REVISED MARCH 2013 LM1973 µPot 3-Channel 76dB Audio Attenuator with Mute Check for Samples: LM1973 1 FEATURES DESCRIPTION The LM1973 is a digitally controlled 3-channel 76dB 2 • 3-Wire Serial Interface audio attenuator fabricated on a CMOS process. • Daisy-Chain Capability Each channel has attenuation steps of 0.5dB from • 104dB Mute Attenuation 0dB–15.5dB, 1.0dB steps from 16dB–47dB, and 2.0dB steps from 48dB– 76dB, with a mute function • Pop and Click Free Attenuation Changes attenuating 104dB. Its logarithmic attenuation curve can be customized through software to fit the desired APPLICATIONS application. • Automated Studio Mixing Consoles The performance of a μPot is demonstrated through • Music Reproduction Systems its excellent Signal-to-Noise Ratio, extremely low • Sound Reinforcement Systems (THD+N), and high channel separation. Each μPot contains a mute function that disconnects the input • Electronic Music (MIDI) signal from the output, providing a minimum • Personal Computer Audio Control attenuation of 96dB. Transitions between any attenuation settings are pop free. KEY SPECIFICATIONS The LM1973's 3-wire serial digital interface is TTL • Total Harmonic Distortion + Noise: 0.003 % and CMOS compatible; receiving data that selects a (max) channel and the desired attenuation level. The Data- Out pin of the LM1973 allows multiple μPots to be • Frequency response: 100 kHz ( −3dB) (min) daisy-chained together, reducing the number of • Attenuation range (excluding mute): 76 dB enable and data lines to be routed for a given (typ) application. • Differential attenuation: ±0.25 dB (max) • Signal-to-noise ratio (ref. 4 Vrms): 110 dB (min) • Channel separation: 110 dB (typ) TYPICAL APPLICATION CONNECTION DIAGRAM Top View Figure 1. Typical Audio Attenuator Application Circuit Figure 2. PDIP and SOIC Packages See Package Numbers NFH0020A and DW0020B 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1994–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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