srusha:
Hello, I have DG408 (http://datasheets.maximintegrated.com/en/ds/DG408-DG409.pdf)and it says in the following scheme that there is V+, V- and gnd, what does V- stands for?
thanks in advance,
Just what it says negative supply voltage. That chip normally runs with 15v +- but supports a lot of different configurations. If you want to use it with positive voltage only connect v- to gnd as the datasheet says on page 6.