LM1972是TI公司的一款无产品，LM1972是具有静音功能的 Micro-Pot 2 通道 78 dB 音频衰减器，本页介绍了LM1972的产品说明、应用、特性等，并给出了与LM1972相关的TI元器件型号供参考。
LM1972 - 具有静音功能的 Micro-Pot 2 通道 78 dB 音频衰减器 - 无 - 音量控制 - TI公司（Texas Instruments，德州仪器）
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
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)
