T
treez
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![Newbie level 1](/styles/images/ranks/alevel1.gif)
Hello,
I am using the LM7705 (charge pump) to provide a negative bias supply voltage for a previously single supply opamp ( i wish to get the Vout of the OPA335 opamp to go to zero).....however, i am trying to work out what the capacitor values are that i need to use.............
What do "V1" and "V2" on page 11 of the LM7705 datasheet refer to?
(my input supply voltage is 3.3V, and i my opamp is providing only 4mA maximum)
LM7705 datasheet
https://www.ti.com/lit/ds/symlink/lm7705.pdf
I am using the LM7705 (charge pump) to provide a negative bias supply voltage for a previously single supply opamp ( i wish to get the Vout of the OPA335 opamp to go to zero).....however, i am trying to work out what the capacitor values are that i need to use.............
What do "V1" and "V2" on page 11 of the LM7705 datasheet refer to?
(my input supply voltage is 3.3V, and i my opamp is providing only 4mA maximum)
LM7705 datasheet
https://www.ti.com/lit/ds/symlink/lm7705.pdf