LM1972 Texas instruments

LM1972

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LM1972

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Описание

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. The performance of a μPot is demonstrated through its excellent 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 attenuation settings are pop free. The LM1972'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 LM1972 allows multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be routed for a given application.

3-Wire Serial Interface
Daisy-Chain Capability
104dB Mute Attenuation
Pop and Click Free Attenuation Changes

Key Specifications

Total Harmonic Distortion +
Noise: 0.003 % (max)
Frequency response: 100 kHz (−3dB) (min)
Attenuation range (excluding
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)

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Number of channels	2
Power supply (V)	4.5 to 15
Gain & attenuation (dB)	0dB to -78dB with 0.5dB steps
THD + N at 1 kHz (%)	0.0008
Interchannel crosstalk at 1 kHz (dBFS)	-110
Dynamic range (dB)	115
Operating temperature range (°C)	0 to 70
Features	2 Channels, Digitally controlled audio attenuator