# LM2907 Voltage Input

#### Tony Elliott

Joined May 8, 2015
158

I am using a LM2907-N for a frequency to voltage circuit. I have looked at the data Sheet http://www.ti.com/lit/ds/symlink/lm2907-n.pdf

I see the maximum voltage is 28 volts, but if I use a ( -15 ground +15 ) does that exceed the voltage as 30 volts. Should I use ( -13 ground +13 ) 26 volts?

The circuit I am using is on page 15

Anthony

#### ErnieM

Joined Apr 24, 2011
8,294
The device is a single supply circuit, meaning you connect power between the +15V and ground.

Since 15 V < 28 V your device is quite safe.

#### Tony Elliott

Joined May 8, 2015
158
So I don't need the - voltage, only ground and +? or do I use only - + ?

#### GopherT

Joined Nov 23, 2012
8,012
So I don't need the - voltage, only ground and +? or do I use only - + ?
If you would use only + and -, then you still exceed 28 v.

Use 15v from 0 to V+.

#### ErnieM

Joined Apr 24, 2011
8,294
So I don't need the - voltage, only ground and +? or do I use only - + ?
Yes, just like the figure on page 15 of the data sheet.

#### #12

Joined Nov 30, 2010
18,223
So I don't need the - voltage, only ground and +? or do I use only - + ?
Yes, just like the schematic you posted.