Op-amp A1 continuously integrates the incoming V_IN signal, thus minimizing noise. Conversion occurs in alternating phases, T- and T+. The T-/T+ phase duration ratio is independent of the RC time constant, is therefore insensitive to C1 toleranc

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Other Materials from the Main Document

• Article «Another weird 555 ADC»
• Figure 1. Op-amp A1 continuously integrates the incoming V_IN signal, thus minimizing noise. Conversion occurs in alternating phases, T- and T+. The T-/T+ phase duration ratio is independent of the RC time constant, is therefore insensitive to C1 toleranc
• Figure 2. Various conversion signals found at circuit nodes X, Y, and Z
• Figure 3. Black = V_IN, Red = T+ duration in ms, Blue = T- duration, C1 = 0.001 µF
• Figure 4. A ±10-V V_IN span is easily accommodated - if you can find a 15 MΩ precision resistor