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请教下ADS1243和ADS1256选型问题

b a89
Prodigy 40 points
Other Parts Discussed in Thread: ADS1243, ADS1256

1. 我们需要处理几十uV左右的小信号，要求分辨率在10uV左右，请问ADS1243和ADS1256那颗更好？

2. ADS1243和ADS1256除了寄存器地址不同外，在使用方法上是否一致（例如，先设通道，PGA，再等ready信号，再读值）？

感谢，盼复！！！

  • 0
    Guru 63401 points

    • ADS1256
    • 24 Bits, No Missing Codes
      • All Data Rates and PGA Settings
    • Up to 23 Bits Noise-Free Resolution
    • ±0.0010% Nonlinearity (max)
    • Data Output Rates to 30kSPS
    • Fast Channel Cycling
      • 18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz
    • One-Shot Conversions with Single-Cycle Settling
    • Flexible Input Multiplexer with Sensor Detect
      • Four Differential Inputs (ADS1256 only)
      • Eight Single-Ended Inputs (ADS1256 only)
    • Chopper-Stabilized Input Buffer
    • Low-Noise PGA: 27nV Input-Referred Noise
    • Self and System Calibration for All PGA Settings
    • 这个介绍, 性能优于 ads1243

  • 0 回复 user151383853
    Prodigy 40 points

    感谢您的回复。

    ADS1243的PGA最大倍数为128， ADS1256PGA的最大倍数为64，请问这个指标需要靠考虑吗？

    另外，在ADS1256上验证一个50uV左右的信号时，发现PGA设为1和PGA设为64时，采样出来的电压值是一样的，没有成倍数增长。这个是如何解释？

    谢谢！