Other Parts Discussed in Thread: LM358, LMC7101, LM2674
This time i am using xtr111 to generate 0-20mA signal corresponding to the relative humidity in the environment (as per the datasheet of xtr111). Used SHT41 (humidity sensor from sensirion) a microcontroller and a dac (mcp4725). When tested for 0-3.3V signal that i had programmed for MCP4725 without taking xtr111 circuitry in picture everything goes well. The sensor shows RH as 64% which is matching to a reference humidity sensor.
When I include xtr111 circuitry in the picture the voltage from the DAC(mcp4725) drops to almost 1/3. I assumed that xtr111 is sourcing more current from the DAC and applied an opamp(voltage follower using LM358) but it gave me no luck.
Now can you please suggest me any solution ??
Rset i had used as 1.65k to generate 20mA at full scale voltage of 3.3V.
Do i need to use another opamp, other than LM358??
If yes, can I use LMC7101 (because i have it readily available with me)???
Or is there any other way out..?? Please help.
Thanks in advance.