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Sensing microvolt with Aduc847

Question asked by emreoz@omak.com.tr on Oct 12, 2015
Latest reply on Oct 15, 2015 by MMA

I need to read analog voltage from 1uV to about 500mV.

 

I configured aduc like that

 

PLLCON =  0x08;

T3CON = 0x81;

T3FD = 0x2D; //OK

SCON = 0x50; //OK

ICON = 0x01; //Turn on IEXC1 source to drive RTD.

SF = 0x3;  

ADC0CON1 = 0x21;

ADC0CON2 = 0x09;   

EADC = 1;       

EA = 1;         

ADCMODE = 0x2b;  

 

But when try to read 20uV aduc give  0 .

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