I am using AD5450 DAC in one of my projects. I am facing a problem of output voltage drop near Vref voltage.
I am using AD5450 in Bipolar operation mode. The output voltage follows the equation given in Page 17 of the datasheet but the output voltage drops when the expected voltage is near Vref.
The circuit implemented is same as in Figure 45.
R3,R5 = 2K ohms
R4 = 1K ohms
R1,R2 = 0 ohms.
C1 = 18pF
Vref = +3.3V
A1,A2 is OPA2277. VCC and VEE for OPA2277 is +3.3V and -3.3V.
|DAC code||8-bit Code (D)||Expected Voltage(V)||OUTPUT VOLTAGE(V)|
The expected voltage near 3.3 and -3.3 is dropping. Can this be an issue of OPA2277 being powered-up using +3.3V nad -3.3V ?