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LM1972M Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM1972M Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 22 page LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute Check for Samples: LM1972 1 FEATURES DESCRIPTION The LM1972 is a digitally controlled 2-channel 78dB 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–47.5dB, 1.0dB steps from 48dB–78dB, with a mute function attenuating 104dB. Its logarithmic • Pop and Click Free Attenuation Changes attenuation curve can be customized through software to fit the desired application. APPLICATIONS The performance of a μPot is demonstrated through • Automated Studio Mixing Consoles its excellent Signal-to-Noise Ratio, extremely low • Music Reproduction Systems (THD+N), and high channel separation. Each μPot • Sound Reinforcement Systems contains a mute function that disconnects the input signal from the output, providing a minimum • Electronic Music (MIDI) attenuation of 96dB. Transitions between any • Personal Computer Audio Control attenuation settings are pop free. The LM1972's 3-wire serial digital interface is TTL KEY SPECIFICATIONS and CMOS compatible; receiving data that selects a • Total Harmonic Distortion + channel and the desired attenuation level. The Data- Noise: 0.003 % (max) Out pin of the LM1972 allows multiple μPots to be daisy-chained together, reducing the number of • Frequency response: 100 kHz ( −3dB) (min) enable and data lines to be routed for a given • Attenuation range (excluding application. mute): 78 dB (typ) • Differential attenuation: ±0.25 dB (max) • Signal-to-noise ratio (ref. 4 Vrms): 110 dB (min) • Channel separation: 100 dB (min) Typical Application Connection Diagram Figure 1. Typical Audio Attenuator Application Figure 2. 20-Lead SOIC - Top View Circuit See DW Package 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 © 1995–2013, 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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