Forum Post: RE: XTR111 - undefined behaviour and high output current drift
Hi Collin, how i can add a picture to the reply? Kind regards Torsten Rehwald
View ArticleForum Post: RE: High Pass Filter-XTR105
Hello SM, The XTR105 is designed to create 2-wire 4-20mA RTD sensor transmitter designs. RTD sensors operate at low frequencies near dc and the 4-20mA output is dc as well, therefore we're not sure how...
View ArticleForum Post: RE: XTR111 - undefined behaviour and high output current drift
Hello Torsten, See the image below for instructions to attach files and images.
View ArticleForum Post: RE: AMC1100 / output voltage under VDD1=0V and VDD2=3.3V
Hello Yaita-san, The voltage output of the AMC1100 is undefined (it could vary throughout the output range) when there is no supply applied to VDD1. Best regards, Jose
View ArticleForum Post: RE: XTR111 - undefined behaviour and high output current drift
Hello Torsten, Thanks for sharing your schematic. Can you share your measurement results as well so we can see the behavior of the device output current vs. temperature? Could you also share the...
View ArticleForum Post: RE: INA326 - Is it okay to put capacitor between +in and -in?
Thank you for your response, Pete. We have not tried the increased values for the resistors. I have attached the waveforms as requested, as well as a redlined version of the circuit. This time, it was...
View ArticleForum Post: RE: Current to voltage convertion
Hi Paul, Thanks to reply so soon, I'm using a Fluke calibrator to provide the 4-20mA, certainly the 0.01ohms resistor was to small to measure the 4-20mA current. I changed the resistor to 10 ohms and...
View ArticleForum Post: RE: Important factors in choosing RFI filter or AC coupling...
Hello V3240, First, let me note that some newer instrumentation amplifiers have integrated EMI/RFI filtering. Please take a look at the INA826 and INA333 . You are correct...large filter resistors and...
View ArticleForum Post: RE: INA326 - Is it okay to put capacitor between +in and -in?
Hello Charles, Is there a dc path for the input bias current?
View ArticleForum Post: RE: INA326 - Is it okay to put capacitor between +in and -in?
Yes, there is a path for the DC bias current.
View ArticleForum Post: RE: INA122 Off by ~50 mV?
Hi Frank, Unfortunately, I don't know how to protect the opamp input - I have never run into that problem before. If the op-amp failed because of too much voltage, then I think the diodes will work but...
View ArticleForum Post: RE: High Pass Filter-XTR105
Hi there, I have highlighted in color in pins 13 and 2 where i put high pass filter. I actually want the filter to block any frequencies less than 225 MHz. I also added a ferrite bead in input signal...
View ArticleForum Post: RE: High Pass Filter-XTR105
Hello SM, The XTR105 has a bandwidth between 5kHz and 50kHz depending on the system gain as shown in the Figure below. Therefore, operation of the XTR105 above these frequencies is not recommended....
View ArticleForum Post: RE: Current to voltage convertion
Hi Carlos, 4mA * 10ohm = 400mV, 400mV * 20 = 8V Simply, the theoretical 8V output cannot exceed the 5V supply voltage. Where would the "extra" 3V come from??? You need to reduce the sensitivity by...
View ArticleForum Post: RE: XTR111 - undefined behaviour and high output current drift
Hello Torsten, Thanks for sharing your data. I looked through it and ran some calculations that you'll find attached and below. First, PCB2 performed significantly worse than the other two and should...
View ArticleForum Post: RE: Current to voltage convertion
Hi Carlos, My previous post was in error..I was off by a decade...The caffeine did not kick in yet.. Lets try again.. 4mA * 10ohm = 40mV, 40mV * 20 = 0.8V With the OFFSET pin tied to V+, the zero...
View ArticleForum Post: LOG114 output
Hi My customer use our LOG114 , you can find the waveform as attached. the yellow waveform is the data signal of their board, there is very big crosstalk to the input of LOG114 , the green waveform is...
View ArticleForum Post: OPA129 output saturating to negative supply voltage
I suspect this may be something simple for an EE to diagnose. We are using an OPA129 as a voltage amplifier with a gain of 101 using 100 Ohm and 10 kOhm resistors. Our piezoelectric device is connected...
View ArticleForum Post: RE: OPA129 output saturating to negative supply voltage
Post a schematic which includes power supply voltages and I am sure we can diagnose the issue.
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