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1FEATURES

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: ±0.25 dB (max)

? Signal-to-noise ratio

(ref. 4 Vrms): 110 dB (min)

? Channel separation: 100 dB (min)

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.

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.