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ST7232A 数据表(PDF) 138 Page - STMicroelectronics |
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ST7232A 数据表(HTML) 138 Page - STMicroelectronics |
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138 / 157 page  ST7232A 138/157 ADC CHARACTERISTICS (Cont’d) Figure 79. RAIN max. vs fADC with CAIN=0pF 1) Figure 80. Recommended CAIN & RAIN values. 2) Figure 81. 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 1 |
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