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德赢Vwin官网 网>电子资料下载>嵌入式开发>ADS125152到MSP430的接口温度传感器

ADS125152到MSP430的接口温度传感器

2017-10-12 | rar | 0.26 MB | 次下载 | 免费

资料介绍

  The foundation of the ADS1251/52 is the sigma-delta modulator. Although detailed theory of this class of

  data converter is beyond the scope of this application report, the fundamental operation of this converter is

  discussed. Figure 2 shows a first-order sigma-delta modulator, which operates as follows.

  The modulator’s function is to reduce the error between the input signal and the previous output to zero.

  Assuming a dc input at A, this dc value is applied to a summing point and added to the value from the

  DAC, E. If the output from the summing junction is positive, the integrator output continues to ramp up

  until it trips the comparator. The comparator then signals to the DAC that the input has passed its upper

  threshold. In turn, the DAC then begins to reduce the effective signal at B, and the integrator begins to

  ramp down. The integrator continues to ramp down until it trips the comparator again. The comparator

  then signals to the DAC that the input has passed its lower threshold. In turn, the DAC then begins to

  increase the effective signal at B, and the integrator begins to ramp up again.

  Because the comparator is latched, this action performs the quantization in time of the analog signal. The

  quantization in amplitude is accomplished through the density of the pulses originating from the

  comparator. If the input signal is close to full scale, more 1 pulses occur than 0 pulses in the bit stream

  from the comparator. Conversely, if the input-signal is close to negative full scale, more 0 pulses occur

  than 1 pulses in the bit stream from the comparator. Signals near midscale have equal numbers of 1 and

  0 pulses. Figure 3 shows this graphically.

ADS125152到MSP430的接口温度传感器

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