ADCs .. noise is it normal ?

Mar 28, 2006 3 Replies
B

Hi all!



I`ve choosed TLC4541 16-bit ADC for my design. One thing is driving me crazy ..when I connect Vin to Vref (+5V) and do few measurements one by one i do get quite big noise(error) here are some samples :



FE4E FE7E FE84 FE55 FEC9 FEC9 FE96 FE68 FE56 FE73 FE86



to get acceptable error(nose) [+/-4] i need to do averaging of 1000 samples again some samples...:



FE85 FE83 FE84 FE85 FE83 FE84 FE84 FE84 FE83 FE85 FE85 FE84 FE85 FE84 FE84 FE84 FE84 FE85 FE85 FE84



my question is: is it normal for ADCs, or I choosed a bad one?



best regards DM



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A

do

How much power supply ripple is present? Given that 1 unit change in the reading is only about 70uV, I'm not surprised that things are jumping around some.

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B

i did following i used tl431 to get 3V and connected it to Vref and Vin.. what i get is .. noise.. FF80 FFB8 FFB8 FFB8 FF8A FFBE FFA6 FF80 FFB8

any idea ? u think it is normal for ADCs ?

best regards david

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C

The inputs Vin and Vref aren't the only way noise can get in.

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