Generally, a donor advised fund is a separately identified fund or account that is maintained and operated by a section 501(c)(3) organization, which is called a sponsoring organization. Each account is composed of contributions made by individual donors. Once the donor makes the contribution, the organization has legal control over it. However, the donor, or the donor's representative, retains advisory privileges with respect to the distribution of funds and the investment of assets in the account. 

https://www.irs.gov/charities-non-profits/charitable-organizations/donor-advised-funds

Your DAF can live long past you. Say it is set to distribute 5% of its assets annually to the causes and charities you support. What if the account grows by 10% annually? 

Then each year, it would distribute more than the next and go on indefinitely. 

We use American Endowment Foundation as the sponsor party. They are independent and have a long track record of managing donor advised funds and all the tax and reporting requirements that come with them. The video to the left shows their online portal and the grant reccomending process.