例如：
Question:Does an external reference improve the ADC performance?
Answer:The internal reference of PSoC 3 or PSoC 5 accurate to 0.1% across the process and full operating voltage.It has temperature coefficient of about 20 PPM/°C.The reference noise is 10 uV RMS.Using a low noise external reference will improve the effective resolution of the ADC.If the external reference has noise below 2 uV, the ENoB will improve by 1-2 bits.
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