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LM1972N Datasheet

  • LM1972N

  • Pot 2-Channel 78dB Audio Attenuator with Mute

  • 11頁

  • NSC

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LM1972 碌Pot 2-Channel 78dB Audio Attenuator with Mute
April 1995
LM1972
碌Pot
鈩?/div>
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鈥?7.5dB, 1.0dB
steps from 48dB鈥?8dB, with a mute function attenuating
104dB. Its logarithmic attenuation curve can be customized
through software to fit the desired application.
The performance of a 碌Pot is demonstrated through its ex-
cellent Signal-to-Noise Ratio, extremely low (THD+N), and
high channel separation. Each 碌Pot contains a mute function
that disconnects the input signal from the output, providing a
minimum attenuation of 96dB. Transitions between any at-
tenuation settings are pop free.
The LM1972鈥檚 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 碌Pots to be daisy-chained together,
reducing the number of enable and data lines to be routed
for a given application.
n
n
n
n
n
Frequency response:
100 kHz (鈭?dB) (min)
Attenuation range (excluding mute):
78dB (typ)
鹵
0.25dB (max)
Differential attenuation:
Signal-to-noise ratio (ref. 4 Vrms):
110dB (min)
Channel separation:
100dB (min)
Features
n
n
n
n
3-wire serial interface
Daisy-chain capability
104dB mute attenuation
Pop and click free attenuation changes
Applications
n
n
n
n
n
Automated studio mixing consoles
Music reproduction systems
Sound reinforcement systems
Electronic music (MIDI)
Personal computer audio control
Key Specifications
n
Total Harmonic Distortion + Noise:
0.003% (max)
Typical Application
Connection Diagram
Dual-In-Line Plastic or
Surface Mount Package
DS011978-1
FIGURE 1. Typical Audio Attenuator Application Circuit
DS011978-2
Top View
Order Number LM1972M or LM1972N
See NS Package Number M20B or N20A
碌Pot
鈩?/div>
and Overture
鈩?/div>
are trademarks of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS011978
www.national.com

LM1972N 產(chǎn)品屬性

  • 18

  • 集成電路 (IC)

  • 線性 - 音頻處理

  • -

  • 音頻衰減器

  • 控制臺，MIDI

  • 通孔

  • 20-DIP（0.300"，7.62mm）

  • 20-DIP

  • 管件

  • *LM1972N

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