- 制造厂商：TI
- 产品类别：音频
- 技术类目：音频放大器 - 音量控制 IC
- 功能描述：具有静音功能的 μPot 2 通道 78dB 音频衰减器
- 点击这里打开及下载LM1972的技术文档资料
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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.
- 3-Wire Serial Interface
- Daisy-Chain Capability
- 104dB Mute Attenuation
- Pop and Click Free Attenuation Changes
- 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)
All trademarks are the property of their respective owners.
- Number of channels (#)
- 2
- Power supply (V)
- 4.5 to 15
- Gain & attenuation (dB)
- 0dB to -78dB with 0.5dB steps
- THD + N @ 1 kHz (%)
- 0.0008
- Interchannel crosstalk @ 1 kHz (dBFS)
- -110
- Dynamic range (dB)
- 115
- Operating temperature range (C)
- 0 to 70
- Rating
- Catalog
LM1972的完整型号有：LM1972M/NOPB、LM1972MX/NOPB，以下是这些产品的关键参数及官网采购报价：
LM1972M/NOPB，工作温度：0 to 70，封装：SOIC (DW)-20，包装数量MPQ：36个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM1972M/NOPB的批量USD价格：1.917（1000+）
LM1972MX/NOPB，工作温度：0 to 70，封装：SOIC (DW)-20，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM1972MX/NOPB的批量USD价格：1.597（1000+）
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