商品型号： LM1972N 库存编号： 37107 热门程度： 品牌： National 外形封装： DIP-20 生产批号： 00+ 起售数量： 10 参 考 价： 38 存货数量： 1800 产品简述： 音频衰减器静音 ,LM1972N 免费资料： 下载Datasheet

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LM1972N简介:µPot™ 2-Channel 78dB Audio Attenuator with Mute
General 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.
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

LM1972N 时间:2008-9-20 9:51:00

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