| Electronics > Beginners |
| Voltage reference value too low |
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| lukasz.kostka:
Hi I've build a basic working circuit with MCP1541 which is a 4096 mV voltage reference. Thing is that I measure 4092 mV. I am a bit puzzled because I do not know how to set that voltage to 4096. Data sheet says that minimal voltage is 4055 and maximal is 4137. Bigger than 4096 is fine because I can trim it with a pot, but what can I do when I have less than 4096 ? |
| HB9EVI:
like you say yourself 4,092V is well within tolerance; either you have to order a bigger stock and select a matching one, or you have to reconsider the circuit you feed with the reference; I don't see a reason, why the 4mV should do a big difference in the real world. p.s. even if you find a matching one, there still is tempco and aging. |
| Benta:
We're talking 1/1000 deviance here. Be happy that you got a part that good. |
| tsman:
4.092V is well within the tolerance range of 4.055V to 4.137V and very close to the ideal 4.096V so I don't see the problem here. If you need something more accurate then you'll need to cherry pick a MCP1541 which is even closer to the ideal 4.096V or find a more accurate voltage reference. Trying to trim it with a pot is going to cause bigger accuracy issues. What is the accuracy of your measurement device? |
| lukasz.kostka:
I am using 12 bit DAC and ADC. That is why I've picked 4096 as my voltage reference. |
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