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參數資料
| 型號： | LM1972N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Pot 2-Channel 78dB Audio Attenuator with Mute |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數： | 1/11頁 |
| 文件大?。?/td> | 301K |
| 代理商： | LM1972N |
LM1972
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 ex-
cellent 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 at-
tenuation 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
n
Total Harmonic Distortion + Noise:
0.003% (max)
n
Frequency response:
n
Attenuation range (excluding mute):
n
Differential attenuation:
n
Signal-to-noise ratio (ref. 4 Vrms):
n
Channel separation:
100 kHz (3dB) (min)
78dB (typ)
±
0.25dB (max)
110dB (min)
100dB (min)
Features
n
3-wire serial interface
n
Daisy-chain capability
n
104dB mute attenuation
n
Pop and click free attenuation changes
Applications
n
Automated studio mixing consoles
n
Music reproduction systems
n
Sound reinforcement systems
n
Electronic music (MIDI)
n
Personal computer audio control
Typical Application
Connection Diagram
μPot
and Overture
are trademarks of National Semiconductor Corporation.
DS011978-1
FIGURE 1. Typical Audio Attenuator Application Circuit
Dual-In-Line Plastic or
Surface Mount Package
DS011978-2
Top View
Order Number LM1972M or LM1972N
See NS Package Number M20B or N20A
April 1995
L
1999 National Semiconductor Corporation
DS011978
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1972N | 制造商:Texas Instruments 功能描述:AUDIO ATTENUATOR 78DB 1972 DIP20 |
| LM1972N/NOPB | 制造商:Texas Instruments 功能描述:Digital Attenuator 104dB Attenuation 20-Pin PDIP Rail |
| LM1973 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:レPot⑩3-Channel 76dB Audio Attenuator with Mute |
| LM1973M | 功能描述:衰減器 -IC RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰減:18 dB 容差: 阻抗: 功率額定值:30 dBm 安裝風格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| LM1973M/NOPB | 功能描述:有源衰減器 RoHS:否 制造商:TriQuint Semiconductor 通道數量: 最大頻率: 阻抗: 最大 VSWR: 位數: 最大工作溫度: 最小工作溫度: |
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