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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC500 датащи(PDF) 9 Page - Microchip Technology |
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TC500 датащи(HTML) 9 Page - Microchip Technology |
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9 / 28 page  © 2002 Microchip Technology Inc. DS21428B-page 9 TC500/A/510/514 FIGURE 4-1: TYPICAL DUAL SLOPE A/D CONVERTER SYSTEM TIMING Auto-Zero Integrate Full Scale Input Reference De-integrate Overshoot Integrator Output Zero Converter Status TTIME Integrator Voltage Comparator Output AB Inputs Controller Operation Notes: Comparator Delay Begin Conversion with Auto-Zero Phase (Positive Input Shown) Sample Input Polarity The length of this phase is chosen almost arbitrarily but needs to be long enough to null out worst case errors (see text). Minimizing Overshoot will Minimize I.O.Z. Time Ready for Next Conversion (Auto-Zero is Idle State) Time Input Integration Phase Capture De-integration Time Integrator Output Zero Phase Complete Undefined A = 0 B = 1 A = 1 0 For Negative Input 1 For Postive Input B = 0 B = 1 B = 0 A = 1 A = 0 VINT Typically = TINT TINT 0 A B Comparator Delay + Processor Latency |
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