AD7849 is it burned?
Pin 17 (VDD) is expecting +15V not -15V, the datasheet states that if VCC comes up before VDD then the part will go into SCR latchup, and they suggest putting a diode in place to prevent this. Depending on how much current your 5V rail was able to produce you may or may not have damaged the part by applying VCC without VDD.

However if you applied -15V to pin 17 for a minute then I would very much expect the part to be damaged.