Forum Post: RE: ECG Amplifier using INA321 and OPA336
I tried connecting the SD pin to VCC again and the circuit seems to work now. I don't know what was wrong the last time I did it.Shrenik
View ArticleForum Post: RE: why pga309evm can not work after calibration with real sensor?
Hello Yao,The TEST pin is pulled down in normal operation. This means that writing to the PGA309 registers does nothing, since the registers are always overwritten with the data from the external...
View ArticleForum Post: RE: Op-Amp for voltage scaling
Hi Paul,LM2902 might be another version of LM324, may be the same die. But what I've written is from experience on the field. Both them are included in the same datasheet, but many times, I have...
View ArticleForum Post: RE: Op-Amp for voltage scaling
Hi Sammy,I would like to highlight the part "4 resistors of 3K", which means we should use the resistors with same values.It's important to note: The tolerance gives us a hint on how much error can be...
View ArticleForum Post: RE: Need low cost replacement circuit for XTR101
Hello Udhay,Please take a look at the XTR105, XTR112, and XTR114. The XTR105 is an updated version of the XTR101 with some performance and linearity improvements. It's also listed at about 1/2 the 1k...
View ArticleForum Post: RE: pH measurement with TI's INA116
Ambar,I must disagree with Tim regarding your question #2. I do not recommend that resistors be used on the inputs.A pH probe behaves as a very weak battery or cell with pH of the liquid determining...
View ArticleForum Post: RE: why pga309evm can not work after calibration with real sensor?
hi.Williams why not use nonlin2.csv when calibrate a real sensor ?
View ArticleForum Post: RE: XTR300 value of RGAIN
Hi Martin,Thanks for the information. It sounds like the application is working well. Unfortunately, the image you attached did not get uploaded correctly. Would you please try uploading it as a file...
View ArticleForum Post: RE: Need low cost replacement circuit for XTR101
Hello,Yes, the XTR108 works very well for RTD applications, there are several examples given in the Application section of the product datasheet. The XTR108 is meant to operate stand-alone with only...
View ArticleForum Post: Minimum TIA gain on LMP91000
Hello,Is there a minimum external resistance for the LMP91000 TIA gain? I would like to use a 10 ohm external resistor with no internal resistor in parallel. I wasn't sure that would be too low of a...
View ArticleForum Post: RE: power supply low noise amplifier
Florian,Thank you for checking in with us with your circuit problems. I have read your question and I think that I need a little more information.Would it be possible to send us a complete circuit...
View ArticleForum Post: RE: INA128 output problem
Heidi,Potentiometers aren't a great way to set the gain of an instrumentation amplifier because their resistance can change quite a bit depending on if any pressure is applied to the leads or the wiper...
View ArticleForum Post: RE: INA128 output problem
Is your input signal AC or DC? The gain should not change at all with the input signal. If this is a DC measurement have you taken into account the offset of the circuit itself? With the inputs both...
View ArticleForum Post: Writing to PGA117
Hello,On page 27 of the PGA117 family datasheet, it has SPI commands for the PGA112/113 and also daisy-chain commands but I don't see where it specifically states what commands I would use for the...
View ArticleForum Post: RE: It is difficult problem
HelloI mean, you may not know, constant current source 4-20mA I, 28V-30V power supply, not the output mode
View ArticleForum Post: TLV2374 absolute maximum rating voltage of output?
Hi, TIersHow much voltage TLV2374 could accept on output pin?Thanks and best regards.
View ArticleForum Post: PGA309 question of EVM
Dear allOur customer have some question about EVM.Please see attached file.Regards,PAN-M(Please visit the site to view this file)
View ArticleForum Post: XTR111 IS pin voltage
I would like to confirm XTR111 operation.The customer uses XTR111 without regurator operation. In this case, the problem occured.In the case of OD="High", VG voltage was higher than IS votage + 7V. (I...
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Forum Post: RE: XTR300 value of RGAIN
Hi CollinHere's another try to post the schematic:By using Rgain = 28k (56k//56k), Rset = 5k6 and Ros = 5k6, I still get a sufficient rise/fall - time and can reduce the power consumption for the whole...
View ArticleForum Post: RE: INA128 output problem
Heidi,Are you accounting for this offset when you calculate gain? For example, with a 10mV input the output would be 10mV * 200 - 13mV = 1.987V, without accounting for the offset this would appear to...
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