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ADS1263: ADS1263设置200UA的偏置后，再读取ADC采集的电压，和实际有偏差

jing zhang
Prodigy 20 points
Part Number: ADS1263

使用如下图所示的寄存器进行采集偏置配置，配置为200ua。再对两路ADC引脚进采集，使用万用表查看给进ADC引脚的电压。和adc采集的电压相比并不一致。ADC引脚测出来为28mV，而adc采集测出的电压为98mV。这是为什么？采集偏置会影响到ADC采集数据吗？

  • 0
    TI__Mastermind 36165 points

    您好

    已经收到了您的案例，调查需要些时间，感谢您的耐心等待

  • 0 回复 Daniel
    Prodigy 20 points

    单纯采集功能是没问题的，但是我们想实现故障检测功能，使用偏置配置输出电流，外接电阻进行回环，测量电阻值，这个方案可行吗？

  • 0 回复 jing zhang
    TI__Mastermind 36165 points

    您好

    Can you provide a block diagram of how the system is configured? I don't understand what the customer has connected to the inputs

    The sensor bias is intended to be used as open wire detection. If the connected sensor has a broken wire, the sensor bias will pull the inputs to the supplies, resulting in a full-scale code. This feature is not intended to be a precision current source; instead, use the current DACs (IDACs) for a higher precision source that is intended to be used in ratiometric measurements