ads1274 前端4522的输入电压范围搞错成0-5V了，能通过下面方法变为+-2.5V差分输出吗？

输入信号范围+-2.5V   原以为4522的输入电压范围是0-5V了 ，加了抬升电路。现在要改回来，能把原来4522的输入负端改为2.5V 吗？？

user151383853：

我看应该是可以的

Shawn Han：

Hi,

请参考 THS4522规格书 "8.4.1.2 DC-Coupled Input Signal Path Considerations for Single-Ended to Differential Conversion". 与你的应用类似，增益不一样。

这段文字就是你加2.5V偏置的用法。"If the source swings from ground to some positive voltage, grounding RG2 gives a unipolar output differential swing from both outputs at VOCM (when the input is at ground) to one polarity of swing. Biasing RG2 to an expected midpoint for the input signal creates a differential output swing around VOCM."

Regards,

Shawn Han