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TC826 데이터시트(PDF) 6 Page - Microchip Technology |
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TC826 데이터시트(HTML) 6 Page - Microchip Technology |
6 / 18 page TC826 DS21477B-page 6 © 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION 3.1 Dual Slope Conversion Principles The TC826 is a dual slope, integrating analog-to-digital converter. The conventional dual slope converter mea- surement cycle has two distinct phases: • Input Signal Integration • Reference Voltage Integration (De-integration) The input signal being converted is integrated for a fixed time period (TSI). Time is measured by counting clock pulses. An opposite polarity constant reference voltage is then integrated until the integrator output voltage returns to zero. The reference integration time is directly proportional to the input signal (TRI) (Figure 3-1). In a simple dual slope converter, a complete conver- sion requires the integrator output to ‘ramp-up’ and ‘ramp-down’. A simple mathematical equation relates the input signal reference voltage and integration time: EQUATION 3-1: FIGURE 3-1: BASIC DUAL SLOPE CONVERTER 1 RC tINT 0 VIN(t)dt = VRTRI RC ∫ Where: VR = Reference Voltage VSI = Signal Integration Time (Fixed) TRI = Reference Voltage Integration Time (Variable) + – Integrator REF Voltage Switch Driver + – Phase Control Polarity Control Control Logic Comparator C R Clock Counter Display Analog Input Signal +/– Fixed Signal Integrate Time Variable Reference Integrate Time VIN ≈ 1/2 VFULL SCALE VIN ≈ 1/4 VFULL SCALE |
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유사한 설명 - TC826 |
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