Alternate Sigma-Delta ADC

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Definition:                           

Equation

Parameters

Diagram

Calculate Properties of a 1-bit ΣΔ ADC:              top

Parameter        

Value

Units

Note

Inputs:

R1 (feedback resistor)  
R2 (input resistor)  
  R3 (pull-up resistor)    
  R4 (pull-down resistor)    
FClk (uC clock frequency)  
N (#bits in sample)    
  Vdd (uC supply)    
           

Outputs:

VMax (max. input voltage) 

VMin (min. input voltage)

  VRange  (|VMax-VMin|)   =Vdd*R2/R1
  TS (sample period)    
  FS (sample rate)    
  FN (sample Nyquist freq.)

           
           

Output Format:                                                        top

Select Format: Scientific Engineering Fixed

Notes:                                                                       top

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This calculator is for the case of a microcontroller (uC) digitizing an analog signal using the 1-bit Sigma-Delta (ΣΔ) approach.

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You must keep C1=C2 when uC input threshold is at Vdd/2.

Copyright ©2007  Raymond J. Allen