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关于OPA1632驱动ADS1675的问题!

Other Parts Discussed in Thread: OPA1632, OPA140, ADS1675

各位专家你们好!

信号调理电路使用的运放都是OPA140,在放大2倍的时候,偏置是140.17uV,在放大400倍时候偏置是1.99mV。用OPA1632驱动ADS1675的时候,出现大概有3-5个mV的偏置(ADC测量出的),请问大概是什么原因。