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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3137 датащи(PDF) 35 Page - STMicroelectronics |
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AN3137 датащи(HTML) 35 Page - STMicroelectronics |
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35 / 42 page  AN3137 Methods for precision improvement Doc ID 16983 Rev 3 35/42 4.5 Design rules for minimizing errors ADC precision can only be significantly improved if external influences on the measurement are minimized. Therefore any precision improvement method also includes rules for correct design. Main design rules for minimizing design errors: ● Grounding of analog/digital power: – star topology ● VDDA, VSSA filtering: – RC, LC filtering – avoid noise from noisy digital power ● VREF selection - offset, value, precision: – reference voltage source precision and stability matched to application precision requirements and ADC capability – reference voltage source value and precision in line with the expected measured range ● Source impedance vs. input impedance knowledge: – use input buffers for measured signal – impedance in relation with required conversion speed (proper sampling time) ● External preamplifier usage: – for low (and also high) level signals – amplifier speed and precision properties – amplifier dependency on frequency ● Select appropriate ADC mode, speed, trigger ● Software methods: averaging, FFT, … (see Chapter 4.3: Software methods) |
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