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ADS1299外部输入测试信号不正常?

Other Parts Discussed in Thread: ADS1299

尊敬的TI工程师:

您好,我测试的电路用的是官网的套件ADS1299,主板是STM32单片机,测试的方法是

1、内部测试信号时,配置寄存器,读出的信号正常

2、外部输入时,配置Vref=4.5,GAIN=1,输入幅值4v,频率1hz正弦波,如下图

10hz正弦波

100hz正弦波

波形随着幅值增大严重失真,幅值也不对,数据转换应该没问题,内部测试的时候是正确的。