ADC refernce voltage 1.6V

[aashishsharma]

I need to give refernce voltage to my adc.
it should be between 1.2 and 1.75 V so i chose 1.6 would do just fine
I have on board 3.3V. Any voltage regulator that could help???
thnks in advance

 

[chuckey]

Depending on how accurate you need it and the current it draws, a pair of .1% resistors (1K?) across the 3.3v supply would give you 1.65 V . If you then connected a 50K multi turn pot across the lower resistor then you could trim the volts to 1.6. if you need more then a few microamps of current use the above but follow it with an opamp buffer, which would give you at lleast 10 mA.
Frank

 

[aashishsharma]

i dont think simple voltage divider or pot would work as If Reference(which is load in this case) starts drawing more current then voltage would change. I agree buffer would solve the problem but then again i need to provide voltage to buffer. using opamp like 741 again requires voltage source.

 

[crutschow]

For best accuracy and stability you should use a voltage reference such as this. It acts like a high accuracy, adjustable zener diode.

 

[aashishsharma]

I think max6018 should work just fine.
Isnt it???

 

[crutschow]

That should work also.