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參數資料
| 型號： | LM1972MNOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | SOP-20 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 406K |
| 代理商： | LM1972MNOPB |
November 2006
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 soft-
ware 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 de-
sired attenuation level. The Data-Out pin of the LM1972 al-
lows 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
Typical Application
1197801
FIGURE 1. Typical Audio Attenuator Application Circuit
Connection Diagram
Dual-In-Line Plastic or
Surface Mount Package
1197802
Top View
Order Number LM1972M or LM1972N
See NS Package Number M20B or N20A
μPot and Overture are trademarks of National Semiconductor Corporation.
2006 National Semiconductor Corporation
11978
www.national.com
LM1972
μ
Pot
2-Channel
78dB
Audio
Attenuator
with
Mute
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| LM1972NNOPB | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| LM1972N/NOPB | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| LM1973N/NOPB | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| LM2005T | 11 W, 2 CHANNEL, AUDIO AMPLIFIER, PSFM11 |
| LM20333AMHX | 6 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO20 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1972MX | 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 |
| LM1972MX/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: |
| LM1972N | 功能描述:IC AUDIO ATTENUATOR 2CH 20-DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| 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 |
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