Need help entering cell formula

This shouldn't be all that complex, I've done this sort of thing before in
Excel, but I can't get this to work.

The LM19 is a temperature sensor that outputs a voltage. I wish to use a
few with my Hobo data loggers, which record voltage (milivolts) and then
downloads to an excel file. I need the formula to copy to the adjoining
cells to convert that value to temperature. I guess I am not suppose to
send a graphis here, but this is the link to the IC datasheet:

[URL="http://www.national.com/ds/LM/LM19.pdf"]http://www.national.com/ds/LM/LM19.pdf[/URL]

The formula for voltage to temperature conversion is on the first page. I
have tried unsuccessfully to convert this to a cell formula, and have even
tried a calculator , step by step to find my errors, but to no avail. Any
help with this problem would be appreciated.

Thanks
Jim

Jim wrote:
> This shouldn't be all that complex, I've done this sort of thing before in
> Excel, but I can't get this to work.
>
> The LM19 is a temperature sensor that outputs a voltage. I wish to use a
> few with my Hobo data loggers, which record voltage (milivolts) and then
> downloads to an excel file. I need the formula to copy to the adjoining
> cells to convert that value to temperature. I guess I am not suppose to
> send a graphis here, but this is the link to the IC datasheet:
>
> [URL="http://www.national.com/ds/LM/LM19.pdf"]http://www.national.com/ds/LM/LM19.pdf[/URL]
>
> The formula for voltage to temperature conversion is on the first page. I
> have tried unsuccessfully to convert this to a cell formula, and have even
> tried a calculator , step by step to find my errors, but to no avail. Any
> help with this problem would be appreciated.
>
> Thanks
> Jim
>
>

Here is how I would try it:

=-1481.96+SQRT(2196200+(1.8639-A1)/0.00000388))

Where A1 has the input voltage V0