LM1972 Digital Attenuator 系列
Texas Instruments Incorporated衰减器 - IC
Texas Instruments 的 LM1972 系列是一款用于音频和通信系统中精确控制信号电平的数字衰减器。这些IC特别适用于需要宽动态范围和精细衰减的应用，例如音频混合台、电信设备和测试测量仪器。值得注意的是，这些衰减器提供广泛的衰减范围，单通道版本通常从0到62 dB，双通道配置可高达124 dB。这使它们在各种需要调整信号电平而不引入不必要的噪声或失真的场景中具有极高的灵活性。当工程师需要在设计中实现高度精确和灵活的控制，特别是在信号强度需要根据输入条件动态调整的系统中，他们往往会选择这种衰减器。另一个实际应用是在音频系统中，能够在不破坏电路完整性的情况下静音信号至关重要。这些IC中的静音功能允许无缝切换不同的信号源，而不会产生任何可听见的咔嗒声或爆裂声，使其非常适合专业音频设置。总体而言，LM1972 系列为需要精确数字控制衰减的设计提供了稳健的解决方案。
凭借其广泛的选择范围和出色的性能特点，它已成为许多工程师解决复杂信号处理任务的首选组件。
常见问答
LM1972 Digital Attenuator - 型号列表
共 8 个型号| 制造商零件编号 | 库存 | 价格 | 产品类别 | 包装方式 | 安装类型 | 标准包装数量 | RoHS | 位数 | 典型衰减 | 通道数量 | 宽度 | 封装形式 | 包装数量 | 供应商器件封装 | 类型 | 应用 | 工作温度 | 工厂包装数量 | 标准封装名称 | 零件状态 | 串扰 | 最大频率 | 最低频率 | 供电电流 | 供电电压 | 供电类型 | 噪声（10Hz至10kHz） | 最大功耗 | 动态范围，ADC/DAC（dB）典型值 | 引脚样式 | 安装样式 | 总长度 | 外壳尺寸-插件 | 系列 | 产品特性 | 软件 | 使用的IC/零件 | 印刷电路板数量 | 测试温度 | 其他名称 | 欧盟RoHS | 阻抗 | 制造商全称 | 冷却的封装 | 抗辐射加固 | 额定功率 | 输出电流 | 技术 | 结工作温度 | SVHC | 海关税号 | 额定电压 | 最小供电电压 | 高度 | 长度 | 重量 | 引脚数 | 材料表面处理 | 尺寸/外形 | 控制器类型 | 控制接口 | 标准包装规格 |
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 SO T/R 2-CHAN AUDIO ATTENUATOR Digital Attenuator 104dB Attenuation 20-Pin SOIC W T/R Digital Attenuator 104dB Attenuation 20-Pin SOIC T/R IC AUDIO ATTENUATR W/MUTE 20SOIC Active Attenuator Micro-Pot 2CH 78dB Audio Attenuator Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute Attenuators Micro-Pot 2CH 78dB Audio Attenuator texas instruments | 963 | 1: ¥27.472 | - | Tape and Reel | Surface Mount | Cut Tape | Lead free / RoHS Compliant | 20 | 78 dB | 2 | 7.6(Max) | 20SOIC W | SOIC | 20-SOIC | Audio Attenuator | Consoles, MIDI | 0 C | 1000 | SOIC | ACTIVE | -110 | 3 MHz | 2 MHz | 0.004 | 4.5 to 12 V | 4.5 to 15 | 0.0008 | 150 | 115 | Gull-wing | SMD/SMT | 13(Max) | 2.35(Max) | LM1972 | 2 Channels, Digitally controlled audio attenuator | SNAS094D | View | 20 | 0 to 70 | LM1972MX/NOPBCT | Compliant | 40 kOhms | Texas Instruments | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Digital Attenuator 104dB Attenuation 20-Pin SOIC W Rail Digital Attenuator 104dB Attenuation 20-Pin SOIC Rail IC AUDIO ATTENUATR W/MUTE 20SOIC Attenuators - ICs Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute Attenuators Digitally Cntrl 62dB Audio Attenuator texas instruments | 564 | 112: ¥22.865 | - | Rail | Surface Mount | Rail / Tube | Contains lead / RoHS non-compliant | 20 | 0.5/1 dB | 2 | 7.6(Max) | 20SOIC W | SOIC | 20-SOIC | Audio Attenuator | Consoles, MIDI | Commercial | 36 | SOIC | ACTIVE | -110 | 3 MHz | 2 MHz | 0.004 | 4.5 to 12 V | 4.5 to 15 | 0.0008 | 150 | 115 | Gull-wing | SMD/SMT | 13(Max) | 2.35(Max) | LM1972 | 2 Channels, Digitally controlled audio attenuator | SNAS094D | View | 20 | 0 to 70 | - | - | - | Texas Instruments | SOIC W | No | 0.15 W | 4 mA | Silicon | 70C | - | - | - | - | - | - | - | - | - | - | - | - | - |
. LM1972M/NOPB - Audio Volume Control 2 Channel 20-SOIC from Texas Instruments. from now! Texas Instruments Incorporated | 11 | 1: ¥35.972 | - | Tube | Surface Mount | Rail / Tube | Lead free / RoHS Compliant | 20 | 78dB | 2 | 7.595mm | 20SOIC W | 36 | TUBE | 20-SOIC | Audio Attenuator | Consoles, MIDI | +70 °C | 36 | - | ACTIVE | -110 | 3MHz | 2 MHz | - | 4.5 to 12 V | 4.5 to 15 | 0.0008 | - | 115 | - | SMD/SMT | - | - | LM1972 | 2 Channels, Digitally controlled audio attenuator | SNAS094D | View | - | 0 to 70 | - | - | 40 kOhms | - | NS | - | - | - | - | - | :No SVHC (16-Dec-2013) | 85423990 | 4.5 V | 12 V | 2.286mm | 13.005mm | 0.000789 | :20 | :MSL 3 - 168 hours | 13.005 x 7.595 x 2.286mm | :Attenuator | :Serial | - |
 | 0 | - | Rail | Through Hole | - | - | 20 | 104(Typ) | 2 | 6.6 | - | PDIP | - | - | - | 70 | - | PDIP | - | - | - | - | 0.004 | - | - | - | 150 | - | Through Hole | - | 26.42(Max) | 3.3 | - | - | - | - | 20 | - | - | Compliant | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
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 | 0 | - | Tube | Through Hole | 18 | - | - | - | - | - | 20-DIP (0.300", 7.62mm) | - | 20-DIP | Audio Attenuator | Consoles, MIDI | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | *LM1972N | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
None 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. Product Highlights: 3-wire serial interface Daisy-chain capability 104dB mute attenuation Pop and click free attenuation changes Potential Applications: Automated studio mixing consoles Music reproduction systems Sound reinforcement systems Electronic music (MIDI) Personal computer audio control Texas Instruments Incorporated | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 36 | |
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