Amber confirmed what TMZ first reported ... the settlement amount is $7 million, and she tells us, "The donation will be divided equally between the ACLU, with a particular focus to stop violence against women, and the Children's Hospital of Los Angeles, where I have worked as a volunteer for the past 10 years."
Amber's also reiterating what she and Johnny said in their joint statement -- that the divorce wasn't about financial gain. She says, "Money played no role for me personally and never has, except to the extent that I could donate it to charity and, in doing so, hopefully help those less able to defend themselves."
Amber says she forfeited all residuals Johnny earned from movie deals he made during their 15-month marriage ... which she'd be entitled to because there was no prenup.
A rep for Children's Hospital thanked Heard and said, "her generosity will support the lifesaving treatments and cures that CHLA provides for critically ill children each year."
Amber added, "Hopefully this experience results in a positive change in the lives of people who need it the most."