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I'm having problem with DSP56F805 board from NewMicro as A/D too noisy about 100 mV. I tried the sample code cut from Motora SDK documents without changing clock divisor from default 1 to 3 . My questions are : 1. Did I blew the A/D in chip by overclocking it ? 2. What is the normal noise level of A/D on DSP56F805 ? 3. This code I cut from Motorola SDK doc #include "adc.h" #define ONE_VOLT 0x26C9 /* (32768 * (1/3.3 Volts)) */ Why ONE_VOLT is calculated from 32768 instead of 32760 and which one is correct ? I've tried both seem 32760 is the correct, but since my A/D is too noisy so I'm not sure about it. Sorry for my english. Best Regards Kris |
ADC Clock divisor
Started by ●September 18, 2003
