L LarryH New Member Dec 7, 2012 #1 Complete newbie here Does anyone have a circuit for producing this type of voltage? I have a 3.3 v source - can I use a voltage regulator to reduce it appropriately? If so, which one and how? Thanks
Complete newbie here Does anyone have a circuit for producing this type of voltage? I have a 3.3 v source - can I use a voltage regulator to reduce it appropriately? If so, which one and how? Thanks
E edeca Active Member Dec 7, 2012 #2 It very much depends what you need it for. Does it need to be precise? If so how precise? How much current do you need from it? Without knowing what your use is it is quite hard to provide advice.
It very much depends what you need it for. Does it need to be precise? If so how precise? How much current do you need from it? Without knowing what your use is it is quite hard to provide advice.
L LarryH New Member Dec 7, 2012 #3 Thanks, it needs to be regulated, using it for an analog reference voltage on an Arduino Uno hope this helps
Thanks, it needs to be regulated, using it for an analog reference voltage on an Arduino Uno hope this helps
E edeca Active Member Dec 7, 2012 #4 Is there a particular reason for 500mV? For ADC voltage references it is more common to use a voltage that divides nicely into the maximum size. I have used these before: https://www.electro-tech-online.com/custompdfs/2012/12/21653b.pdf I can find a few 1.225v references from Maxim with a quick search.
Is there a particular reason for 500mV? For ADC voltage references it is more common to use a voltage that divides nicely into the maximum size. I have used these before: https://www.electro-tech-online.com/custompdfs/2012/12/21653b.pdf I can find a few 1.225v references from Maxim with a quick search.
D dougy83 Well-Known Member Most Helpful Member Dec 7, 2012 #5 According to the datasheet I have on hand, i.e. 8271D–AVR–05/11 (Table 29-16), the minimum reference voltage is 1V. There's an internal 1.1V reference in the ATMEGA that you could use, or perhaps a resistor divider.
According to the datasheet I have on hand, i.e. 8271D–AVR–05/11 (Table 29-16), the minimum reference voltage is 1V. There's an internal 1.1V reference in the ATMEGA that you could use, or perhaps a resistor divider.
K KeepItSimpleStupid Well-Known Member Most Helpful Member Dec 7, 2012 #6 200 mV references exist, so you may have to amplify it. No big deal though.