Hello,
I am using XTR117 device trying to implement the circuit described in Figure 9 of the RCV420 datasheet (the following one).
The part of the RCV420 and ISO122 is exactly THE SAME as the above design. But instead of the XTR105 device, I´m using the XTR117.
For that part, I am using the following schematic :
The signal input is a sinusoidal wave of 10 kHz. The pin 7 is connected to power supply: 12 VDC, (not the +15VDC from the RCV420& ISO122 circuitry) and pin 3 (IRET) is connected to the same GND reference as the sinusoidal and power supply signals.
The results of this is that the input signal is deformed considerably at the entry of the circuit. And the pin 4 (IO) does not give any signal.
The transistor receives square pulses in pin 6 and pin 5 similar to this situation.
- Is the Iret connection to GND reference the mistake? Or is the loop supply the problem or the transistor?
- Is the 1N4148 really important for the operation of the circuit or can it be removed?
- Could you please help me to solve this problem?
Thank you very much,