パッケージ情報
| パッケージ | ピン数 SOIC (DW) | 20 |
| 動作温度範囲 (℃) 0 to 70 |
| パッケージ数量 | キャリア 1,000 | LARGE T&R |
LM1972 の特徴
LM1972 に関する概要
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.
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) |