Other Parts Discussed in Thread: DAC161S997, , ISO7421
I have 2 questions about inputting HART signal to DAC161S997.
1. When HART modem output FSK amplitude at 700mVp-p to DAC161S997,
the output of DAC161S997-9pin(OUT) drops to 70mVp-p
and it monitors 300mVp-p at a point of the 250Ω Resistor.
According to HART specification, it is written that FSK amplitude needs more than 400mVp-p.
Is it possible to gain FSK amplitude at 9pin(OUT) ?
2. When DACout is 5mA, sine wave is output correctly.
But when DACout is 4mA, it looks like one side of sine wave is not good.
Do you have any solutions for outputting normal sine wave at 4mA ?
Please see the attached PDF for detail.