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ES51991 Datasheet(PDF) 4 Page - Cyrustek corporation |
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ES51991 Datasheet(HTML) 4 Page - Cyrustek corporation |
4 / 16 page 06/09/20 4 ES51991 11,000 Counts ADC Function description 1. Dual Slope A/D-Four Phases Timing ES51991 is a dual-slope analog-to-digital converter (ADC). Figure 1 is a structure of dual-slope integrator. Its measurement cycle has two distinct phases: input signal integration (INT) phase and reference voltage integration (DINT) phase. In INT phase, the input signal is integrated for a fixed time period, then A/D enters DINT phase in which an opposite polarity constant reference voltage is integrated until the integrator output voltage becomes to zero. Since both the time period for input signal integration and the amount of reference voltage are fixed, thus the de-integration time is proportional to the input signal. Hence, we can define the mathematical equation about input signal, reference voltage integration (see Figure 1.): ∫ × × × = × INT T DINT REF IN T V C Buf dt t V C Buf 0 int 1 ) ( int 1 where, ) (t V IN = input signal REF V = reference voltage INT T = integration time (fixed) DINT T = de-integration time (proportional to ) (t V IN ) Figure 1. the structure of dual-slope integrator and its output waveform. If ) (t V IN is a constant, we can rewrite above equation: IN REF INT DINT V V T T × = RAZ integration time input signal > 0 Fixed integration time Variable deintegration time integration time input signal < 0 Fixed integration time Variable deintegration time fixed slope fixed slope different input different input input signal reference voltage Buf BufX10 Cint integrator output RAZ |
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