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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST72321B 데이터시트(PDF) 167 Page - STMicroelectronics |
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ST72321B 데이터시트(HTML) 167 Page - STMicroelectronics |
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167 / 187 page  167/187 ADC CHARACTERISTICS (Cont’d) Figure 93. RAIN max. vs fADC with CAIN=0pF 1) Figure 94. Recommended CAIN & RAIN values. 2) Figure 95. Typical A/D Converter Application Notes: 1. CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad ca- pacitance (3pF). A high CPARASITIC value will downgrade conversion accuracy. To remedy this, fADC should be reduced. 2. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization time and decreased to allow the use of a larger serial resistor (RAIN). 0 5 10 15 20 25 30 35 40 45 010 30 70 CPARASITIC (pF) 2 MHz 1 MHz 0.1 1 10 100 1000 0.01 0.1 1 10 fAIN(KHz) Cain 10 nF Cain 22 nF Cain 47 nF AINx ST72XXX VDD IL ±1 µA VT 0.6V VT 0.6V CADC 12pF VAIN RAIN 10-Bit A/D Conversion 2k Ω(max) CAIN |
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