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Mcp1541 4.096v reference ic

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jit_singh_tara

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I want a stable reference voltage source for 12bit adc conversion .
For that purpose i opted for mcp1541 from microchip .But there is difference in the o/p for every part .

1st IC :4.098V Dc.
2nd Ic : 4.110V DC.
3rd Ic : 4.084 V DC.

Can somebody explain why this kind of response is there .
Is there some ic with only +-1mV variation in voltage reference of 4.096V .
 

hello,

Initial accuracy +-1% maxi
and 50ppm /°C

see datasheet
your 3 device are inside the spec. DS21653B page 2 !
min= 4,055
max=4.137
 
Ok i got the point with mcp1541 , But is there any other option using which i can generate a stable 4.096V which doesnt change with time . I dont want to use trimpot with supply......
 

jit_singh_tara said:
But is there any other option using which
i can generate a stable 4.096V which doesnt change with time ...
Click to expand...

No chance to get better with a low cost voltage reference..
you allways will have some change with ambiant temperature and during time
+-50ppm /°C + and maxima +-4mV f(time)

so the best way is to use a calibration value in EEPROM to reduce calculus error in physical unit conversions.
because even the absolute reference is 4110 instead of 4096 => delta 14mV , next change along temperature or time will be less..
and so use 4110 in your application..

B.W. What is the purpose of these Volt reference ?
for 12bits ADC ?
all the measure chain must have similar accuracy level..
 
jit_singh_tara said:
Is there some ic with only +-1mV variation in voltage reference of 4.096V .
Click to expand...

Certainly, however the most appropriate choice depends on several other key specifications, besides the initial accuracy:

1. Drift/Temperature Coefficient
2. Maximum Output Noise
3. Quiescent Current
4. Dropout Voltage
5. Shutdown Capabilities
6. Current Source/Sink Capabilities
7. Cost/Budget Restraints

With a voltage variation of +/- 1mV @ 4.096V output, look for a device with an initial accuracy of 0.04% or better.

Some possible options are:



Example, ADR4540B or ADR444B

Linear Technology - Voltage References

Example, LT1461A, LTC6655B



BigDog
 
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