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If I am correct, analog components work off the VDDA voltage domain. On the CY8CKIT-059, VDDA = 5V- one schottky diode drop from the KitProg board (D1). Therefore, the max voltage in the natural state of the CY8CKIT-059 is about 4.75V.
What is the resistor-equivalent load on Vout?
The PSoC5LP has two 8-bit VDACs. To achieve a 12-bit, you must be using the Dithering VDAC. In this case, are you using the cap recommended to stabilize the VDAC voltage to smooth the dithering signal?
Len "Engineering is an Art. The Art of Compromise."