LM1972M ,Micro-Pot 2-Channel 78 dB Audio Attenuator with MuteLM1972 µPot 2-Channel 78dB Audio Attenuator with MuteApril 1995LM1972™µPot 2-Channel 78dB Audio Att ..
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LM4040AIM3-2.5+T ,Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown VoltagesFeaturesThe LM4040 is a precision two-terminal shunt mode,♦ Ultra-Small 3-Pin SC70 Packagebandgap v ..
LM1972M-LM1972N
Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute
LM1972
µPot™ 2-Channel 78dB Audio Attenuator with Mute
General DescriptionThe LM1972isa digitally controlled 2-channel 78dB audio
attenuator fabricatedona CMOS process. Each channel
has attenuation stepsof 0.5dB from 0dB–47.5dB, 1.0dB
steps from 48dB–78dB, witha mute function attenuating
104dB.Its logarithmic attenuation curve canbe customized
through softwaretofitthe desired application.
The performanceofa µPotis demonstrated throughits
excellent Signal-to-Noise Ratio, extremely low (THD+N),
and high channel separation. Each µPot containsa mute
function that disconnects the input signal from the output,
providinga minimum attenuationof 96dB. Transitions be-
tween any attenuation settings are pop free.
The LM1972’s 3-wire serial digital interfaceis TTL and
CMOS compatible; receiving data that selectsa channel and
the desired attenuation level. The Data-Out pinof the
LM1972 allows multiple µPotstobe daisy-chained together,
reducing the numberof enable and data linestobe routed
fora given application.
Key Specifications Total Harmonic Distortion+ Noise: 0.003% (max) Frequency response: 100 kHz (−3dB) (min) Attenuation range (excluding mute): 78dB (typ) Differential attenuation: ±0.25dB (max) Signal-to-noise ratio (ref.4 Vrms): 110dB (min) Channel separation: 100dB (min)
Features 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
Typical Application Connection Diagram
Dual-In-Line Plasticor
Surface Mount PackageTop View
Order Number LM1972Mor LM1972N
SeeNS Package Number M20Bor N20A
FIGURE1. Typical Audio Attenuator Application Circuit
April 1995
LM1972
µPot
2-Channel
78dB
Audio
Attenuator
with
Mute
