我想用ADS7951,阅读芯片资料的时候看这样写的,
In this condition it is recommended to limit source impedance to 50Ω or less. Higher source impedance may affect the signal settling time after a multiplexer channel change. This condition can affect linearity and total harmonic distortion.
文档中的source impedance 是说的什么,难道我的信号输入前必须加一个跟随器?我看好多人用的是接了跟随器,但是跟随器后边又接了一个1K电阻,这样是为什么啊?请大侠解答一二。。 |