I have just implemented AD5685R in a new design however when powering up the system the AD5685R circuit (TSSOP16) get very hot.
If I strip of everything surrounding the circuit except for connecting 5V to Vdd and pin 10 (GAIN) and 0V to GND I measure 4.2V on pin 11 (Vlogic). Idd is 1,8mA. With this configuration the circuit stays cool.
If I connect 5V to Vlogic and 0V to GND the voltage at pin 5 (Vdd) is zero.
With 5V at Vdd and 5V at Vlogic I measure Idd to 0.6mA; the circuit stays cool.
If I then lower the Vlogic voltage the Idd increase up to 40mA at Vlogic = 3.3V; the current at Vlogic I measure to 27mA.
I have also tried with two other AD5685R circuits and one AD5684R with the same behavior.
The datasheet specifies Vdd (2.7V to 5.5V) and Vlogic (1.8V to 5.5V); Ilogic max 3uA and Idd max 1.3mA.
Anyone know what's going on?