Datasheet Texas Instruments LM1972M — 数据表

LM1972
www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute
Check for Samples: LM1972 FEATURES DESCRIPTION The LM1972 is a digitally controlled 2-channel 78dB
audio attenuator fabricated on a CMOS process.
Each channel has attenuation steps of 0.5dB from
0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a
mute function attenuating 104dB. Its logarithmic
attenuation curve can be customized through
software to fit the desired application. 1 2 3-Wire Serial Interface
Daisy-Chain Capability
104dB Mute Attenuation
Pop and Click Free Attenuation Changes APPLICATIONS Automated Studio Mixing Consoles
Music Reproduction Systems
Sound Reinforcement Systems
Electronic Music (MIDI)
Personal Computer Audio Control KEY SPECIFICATIONS Total Harmonic Distortion +
Noise: 0.003 % (max)
Frequency response: 100 kHz (-3dB) (min)
Attenuation range (excluding
mute): 78 dB (typ)
Differential attenuation: В±0.25 dB (max)
Signal-to-noise ratio
(ref. 4 Vrms): 110 dB (min) …