Other Parts Discussed in Thread: XTR111
When I first energize, the XTR116 draws 80 ma current. Since there is too much voltage drop over the 250 ohm resistor, the supply voltage (V + and IO) of the XTR116 drops below 7.5 volts…
Hi Mert,
The PGA308 is a programmable gain amplifier voltage output device; and therefore all the GDAC/ZDAC coefficients are expressed in voltage.
The device can be connected to a 4-20mA current output transmitter, such as the XTR116 (two-wire 4mA to 20mA…
Hi Tobias,
Just wanted to follow-up, please let me know if the issue with the PGA308 output not changing with input voltage persists after adding the XTR116 reference pin compensation above and checking the reference pin voltage with an external meter.
…Hi Tobias,
Thank you for the confirmation that its now possible to write the OTP's. If I understood the last post correctly, you are now setting the 'DOUT SEL' bit to '1' with DOUT/VCLAMP set as a digital output function. If this is the…
Hi Tobias,
1) The schematic shows the DOUT/VCLAMP is left floating or disconnected... The DOUT SEL bit (CFG2 Register [D8]) sets the DOUT/VCLAMP pin as either a digital output function (DOUT SEL = 1) or as a VCLAMP function (DOUT SEL = 0). Can you please…
Hello Kuramochi-san,
Thank you for your post.
In applications where you decide to omit the external transistor and rely only on the internal transistor of the XTR116, you can expect worse performance. The power dissipated in this internal transistor heats…
Hi TQ,
omitting Q1 will change the output circuitry and all involved current and voltage levels. Also, the internal transistor is not suited to deliver all the output current. It would heat up as much as the external transistor, but on the much much smaller…
Hello,
First I'll provide the simplest response - the entire DAC874xH family was developed in parallel just with some staggered release. Otherwise the parts are completely identical and there are no concerns with respect to availability.
The reason…
Hi Jonathan,
Input isolated 3-wire transmitters can typically be connected to 4-wire analog input modules by connecting the negative input (Input-) to GND. The figure below shows an example of the transmitter and receiver wiring connections. To learn…
Hi Kai,
Hi,
pin 3 of XTR116 is no usual ground! You must not connect pin 3 to the ground of the 24V supply voltage of the loop. Pin 3 must float.
Have a look at figure 1 of datasheet of XTR116 and try to understand what R1 and R2 are for.
Kai
Thank you for your post. Is the Q1 BCP56 in the SOT-223 package? Can you share a picture of your layout? It's important for this package type that you use larger copper pads to reduce thermal resistance and improve power performance. You can read more…
