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ST72F521 Arkusz danych(PDF) 194 Page - STMicroelectronics |
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ST72F521 Arkusz danych(HTML) 194 Page - STMicroelectronics |
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194 / 215 page  ST72F521, ST72521B 194/215 ADC CHARACTERISTICS (Cont’d) Figure 110. RAIN max. vs fADC with CAIN=0pF 1) Figure 111. Recommended CAIN & RAIN values. 2) Figure 112. 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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