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ST7LITE02 数据表(PDF) 102 Page - STMicroelectronics |
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ST7LITE02 数据表(HTML) 102 Page - STMicroelectronics |
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102 / 122 page  ST7LITE0, ST7SUPERLITE 102/122 13.11 8-BIT ADC CHARACTERISTICS TA = -40°C to 125°C, unless otherwise specified Figure 86. RAIN max. vs fADC with CAIN=0pF 3) Figure 87. Recommended CAIN/RAIN values 4) Figure 88. Typical Application with ADC Notes: 1. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k Ω). Data based on characterization results, not tested in production. 2. The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable is then always valid. 3.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. 4. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization and to allow the use of a larger serial resistor (RAIN). It is valid for all fADC frequencies ≤ 4MHz. Symbol Parameter Conditions Min Typ Max Unit fADC ADC clock frequency 4 MHz VAIN Conversion voltage range VSS VDD V RAIN External input resistor 10 1) k Ω CADC Internal sample and hold capacitor VDD=5V 3 pF tSTAB Stabilization time after ADC enable fCPU=8MHz, fADC=4MHz 0 2) µs tCONV Conversion time (tSAMPLE+tHOLD)3 tSAMPLE Sample capacitor loading time 4 1/fADC tHOLD Hold conversion time 8 0 5 10 15 20 25 30 35 40 45 010 30 70 CPARASITIC (pF) 4 MHz 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 3pF VAIN RAIN 8-Bit A/D Conversion 2k Ω(max) CAIN 1 |
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