Hi...
We are using DAC7760 with configuration as shown in attached image.
When we are providing external 5V to IC ( without providing +15V to AVDD & -15V to AVSS ), it is observed that there are voltages generated on AVDD, AVSS & All Outputs ( Pin 21 )
AVDD = 1.3 V
AVSS = 0.53 V
All Output Pins = 0.47 V
For testing purpose ( considering, DVDD may put voltage internally on AVDD ), we have test the circuit by keeping DVDD & DVDD-EN pins open / not connected to VCC.
In this case -
AVDD = 1.22V
AVSS = 0.22
All IC O/P = 0.075 V (approx )
What could be the reason ?