Datasheet > LM1972M/NOPB

LM1972M/NOPB

更新时间： 2024-11-24 11:12:31

品牌	Logo	应用领域
德州仪器 - TI		衰减器
页数	文件大小	规格书
23页	880K
描述
具有静音功能的 μPot 2 通道 78dB 音频衰减器 \| DW \| 20 \| 0 to 70

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LM1972M/NOPB 数据手册

LM1972

www.ti.com

SNAS094D –APRIL 1995–REVISED MARCH 2013

LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute

Check for Samples: LM1972

FEATURES

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.

•

3-Wire Serial Interface

Daisy-Chain Capability

104dB Mute Attenuation

Pop and Click Free Attenuation Changes

APPLICATIONS

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

•

Automated Studio Mixing Consoles

Music Reproduction Systems

Sound Reinforcement Systems

Electronic Music (MIDI)

signal from the output, providing

minimum

attenuation of 96dB. Transitions between any

attenuation settings are pop free.

Personal Computer Audio Control

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): 78 dB (typ)

•

Differential attenuation: ±0.25 dB (max)

Signal-to-noise ratio

(ref. 4 Vrms): 110 dB (min)

•

Channel separation: 100 dB (min)

Typical Application

Connection Diagram

Figure 1. Typical Audio Attenuator Application

Circuit

Figure 2. 20-Lead SOIC - Top View

See DW Package

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...23

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LM1972M/NOPB 替代型号

型号	品牌	替代类型	描述	数据表
LM1972M	NSC	功能相似	Pot 2-Channel 78dB Audio Attenuator with Mute

与LM1972M/NOPB相关器件

型号	品牌	获取价格	描述	数据表
LM1972MDC	TI	获取价格	IC,TONE/VOLUME/BALANCE CONTROL,CMOS,DIE
LM1972MWC	TI	获取价格	IC,TONE/VOLUME/BALANCE CONTROL,CMOS,WAFER
LM1972MX	NSC	获取价格	Tone/Volume/Balance Control
LM1972MX/NOPB	TI	获取价格	具有静音功能的 μPot 2 通道 78dB 音频衰减器 \| DW \| 20 \| 0 to
LM1972N	NSC	获取价格	Pot 2-Channel 78dB Audio Attenuator with Mute
LM1972NNOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDIP20, PLASTIC, DIP-20, Consumer IC:Other
LM1973	NSC	获取价格	レPot⑩3-Channel 76dB Audio Attenuator with Mut
LM1973M	NSC	获取价格	レPot⑩3-Channel 76dB Audio Attenuator with Mut
LM1973M/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDSO20, 0.300 INCH, PLASTIC, SOP-20, Consumer IC:Other
LM1973MNOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDSO20, SOP-20, Consumer IC:Other

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