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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TC7135CBU 데이터시트(PDF) 7 Page - Microchip Technology |
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TC7135CBU 데이터시트(HTML) 7 Page - Microchip Technology |
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7 / 24 page  2004 Microchip Technology Inc. DS21460C-page 7 TC7135 3.2.1 SYSTEM ZERO During this phase, errors due to buffer, integrator and comparator offset voltages are compensated for by charging CAZ (auto-zero capacitor) with a compensat- ing error voltage. With a zero input voltage, the integrator output will remain at zero. The external input signal is disconnected from the internal circuitry by opening the two SWI switches. The internal input points connect to the ANALOG COMMON pin. The reference capacitor charges to the reference voltage potential through SWR. A feedback loop, closed around the integrator and comparator, charges the CAZ capacitor with a voltage to compen- sate for buffer amplifier, integrator and comparator offset voltages (see Figure 3-2). FIGURE 3-2: System Zero Phase. 3.2.2 ANALOG INPUT SIGNAL INTEGRATION The TC7135 integrates the differential voltage between the +INPUT and -INPUT pins. The differential voltage must be within the device Common mode range; -1V from either supply rail, typically. The input signal polarity is determined at the end of this phase. FIGURE 3-3: Input Signal Integration Phase. 3.2.3 REFERENCE VOLTAGE INTEGRATION The previously charged reference capacitor is con- nected with the proper polarity to ramp the integrator output back to zero (see Figure 3-4). The digital reading displayed is: EQUATION 3-3: FIGURE 3-4: Reference Voltage Integration Cycle. 3.2.4 INTEGRATOR OUTPUT ZERO This phase ensures the integrator output is at 0V when the system zero phase is entered. It also ensures that the true system offset voltages are compensated for. This phase normally lasts 100 to 200 clock cycles. If an overrange condition exists, the phase is extended to 6200 clock cycles (see Figure 3-5). FIGURE 3-5: Integrator Output Zero Phase. + – + – +IN REF IN Analog Common IN SWR SWIZ SWZ SWZ Integrator Switch Closed Switch Open Comparator To Section Analog Input Buffer RINT CINT CREF CSZ SWI SWZ SWI SW1 + – Digital + – + – +IN REF IN Analog Common IN SWR SWIZ SWZ SWZ Integrator Switch Closed Switch Open Comparator To Section Analog Input Buffer RINT CINT CREF CSZ SWI SWZ SWI SW1 + – Digital Reading 10 000 Differential Input [] V REF ----------------------------------------------- , = + – + – +IN REF IN Analog Common IN SWR SWIZ SWZ SWZ Integrator Switch Closed Switch Open Comparator To Section Analog Input Buffer RINT CINT CREF CSZ SWI SWZ SWI SW1 + – Digital + – + – +IN REF IN Analog Common IN SWR SWIZ SWZ SWZ Integrator Switch Closed Switch Open Comparator To Section Analog Input Buffer RINT CINT CREF CSZ SWI SWZ SWI SW1 + – Digital |
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