Part Number:PGA281
Hi Everyone,
In the datasheet of PGA281, I have seen the following statement " The supply voltage for the output stage is normally connected to the converter supply, thus
preventing signal overloads from the high-voltage analog supply."
Can we connect the VSOP pin of PGA281 be connected to Analog power supply of ADC (AVDD of ADC) or should VSOP pin be connected to ADC reference ??
Appreciate your help at the earliest...
Regards
Rajesh K
Part Number:TIDA-00378
Hi team,
The customer refers to TIDA-00378 to measure PM2.5.
After he installs the TIDA-00378 Firmware, he checks the main.c file.
He does not know where the calculation formula come and he would like to know if there is the document which
can prove the calculation formula is correct. Please check the attach for the calculation formula.
Would you explain the calculation formula?
Part Number:LMP93601EVM
Can we supply either the LabView Code or the Labview drivers used in the LMP93601EVM?
I understand if they are supplied as is with no support.
Thanks for your help with this!
Richard Elmquist
Part Number:INA117
I'm attempting to repair a circuit for a large instrument. Based on how the circuit is situated, I am attempting to replace some of the op-amps in the circuit. My circuit contains the INA117BM High Common-Mode Voltage Difference Amplifier (TO-99-8 pin) and the INA114BP Precision Instrumentation Amplifier (DIP-8 pin). The issue I'm facing is that the amplifiers are old, and I can't find some of them on Digi-Key. The INA117BM is non-stocked, and it usually runs around $70. On the other hand, the INA114BP is available at the cost of around $13. Regardless of availability, I was wondering what suitable replacements would you recommend for the amplifiers, specifically the INA117BM?
Sorry, I forgot to mention this, but because I am repairing a new piece of equipment and not designing from scratch, I would prefer it if I can match the same layout style as the original amplifier. That would mean for replacing the INA117BM, I would prefer a TO-99-8 pin package or a DIP 8-pin package. It should be noted that the original INA117BM had its legs spread out such that it fit a DIP-8 pin socket, so I'm not necessarily looking to fit a TO-99 socket, but a DIP-8 socket.
Part Number:OPA547EVM
Hello,
I am a mechanical engineering student, and I considering using the OPA547/OPA 548 Evaluation Module as a current amplifier, the input will be 1 kHz 1 V low current from a function generator and the output will be 1 amp the exit impedance is around 1 ohm. I have 2 main questions
1. can I use the Improved Howland Current Pump Configuration Setup in order to answer my experiment needs.
2. the user guide has a BOM table, does everything in the BOM table is coming as a part of the package of the module?
thank you
Alex Kolomisky.
Part Number:PGA308
Hello team,
My customer would like to know the PGA308 output voltage behavior at Power-up and Power Down.
He had some questions as below about PGA308. Would you please advise after checking attached excel file.
Q1) Overshoot at output pin of PGA308 like the attached excel file was observed at PGA308 powered up. It seems that PGA308 causes the overshoot. Is it correct?
Q2) At the power down, we can see the overshoot. It seems that PGA308 causes the overshoot. Is it correct?
Q3) Can we reduce the overshoot using configuration of PGA308?
PGA308 Captured waveform, Schmatics and consititon as below.
/cfs-file/__key/communityserver-discussions-components-files/14/4150.PGA308PowerON_0FFF_OFF-waveform_5F00_180319.xlsx
Please tell me so if this penomenon is caused by PGA308.
Your advise would be so appreciated.
Best Regards,
Akihisa Tamazaki
Part Number:MPY634
Hi all
Would you mind if we ask MPY634KP/KU?
How much is the maximum TJ?(125C?)
How much is the θja?
We could not find it on the datasheet.
Kind regards,
Hirotaka Matsumoto
Part Number:OPA211
Hello,
I would like to know the behavior of OPA211 where OPA is in shutdown mode.
More precisely on the input. What's the state of the inputs when OPA211 is in shutdown mode ? High impedance ?
What's happen when we apply a signal on the inputs , and OPA211 is in shutdown mode? The inputs can be destroyed?
Thanks in advance for your feedback.
BR
Sébastien
Hi
I HAVE A QUESTION ABOUT, VERY WEAK SIGNAL AMPLIFICATION.THIS SIGNAL RIDS ON A 12V DC OFFSET.
THIS SIGNAL COME FROM INDUCTIVE SENSOR.LEAST CHANGE IN SENSOR ENVIRONMENTS MAKE 20 MICRO VOLTS ON OUTPUT SENSOR.SENSOR OUTPUT SIGNAL CHANGE ALONG X AXIS AND EXPONENTIALLY CHANGED IN DIFFERENT CONSTANT TIME AND ALONG Y AXIS NOT CHANGE.
I WANT DIGITIZE THIS SIGNAL WITH 0V TO 5V ADC INPUT RANGE WITHOUT USE CAPACITOR FOR FILTER AND REMOVE DC OFFSET.
I PUT TWO PICTURE FROM SIMULATOR
AND OTHER
THESE PICTURES SHOW OUTPUT SENSOR CHANGES .
EVERYONE CAN HELP ME FOR AMPLIFY AND CONDITIONING THIS SIGNAL??
THANKS
SINCERELY.
Part Number:XTR300
Dear Sirs
Our Incoming XTR300 Based Design Will Output +-10V Or +-24mA (Depending on M2 State)
Design Its Based On tiduah1 www.ti.com/.../tiduah1.pdf
For Current Output, Simulation Works Fine, and I understand the formula
But For Voltage Output, the red marked formula seems to be wrong
Ignoring the red marked formula and usng the blue marked formula, simulation is not precise at all, also when solving For VDAC=2.5, blue equation fails (VDAC-VREF=0)
What is the correct output expression ? I mean: Vout=........
I´ve tried to look at datasheet but datasheet equation expects ROS and RSET, i have only 1 of them
NOTE: For IOUT, i placed 250R to observe the output current
Part Number:OPA2376
Hi, Experts:
My customer is using OPA2376 to drive a TOSA (transmitter optical sub-assembly). The detailed application schematic is below.
The V_DAC2 is biased in the range of 0.4V to 1.2V. The TOSA_CTL_2 is a PWM signal at a frequency of 115.2KHz which drives a SPST switch, hence the voltage waveform at the positive input of OPA2376 (U35-A) will be a square wave. The output of OPA2376 drives a BJT, hence the collector current is also a square current wave. In that sense, the TOSA is turned ON/OFF along with the collector current.
The problem is customer found that in some devices, the collector current shows ringing at the raising edge as below picture (they use optical receiver to receive the TOSA output signal, convert it to electric voltage, then feed to scope), while other devices don’t have the ringing problem. If they replace the “bad” OPA2376 with a “good” one when raising issue happens, the problem can go away.
When TOSA_CTL_2 is low, the pin 5 of OPA2376(+ input) will be forced to ground. The voltage of pin 6 of OPA2376 (- input) is a little bit higher than 0V due to the voltage divider R284 (1M) and R291 (10k), hence the BJT Q245 is off. OPA2376 is saturated in the state of open loop comparator.
When TOSA_CTL_2 is high, OPA works in close loop mode since the + input is properly biased, and the collector current will be set correctly.
It looks like a stability problem of OPA2376? Or the ringing is caused by switching between open loop comparator mode and close loop mode?
Thanks a lot for your kind suggestions! Please let me know anything I can try to help the debug.
Yarn
Part Number:XTR101
Hello,
I am firmware engineer and want to develop voltage to current (4-20mA) converter for my temperature monitoring project. I have identified 2-wire PT100 and XTR101 for this project.
I have very less experience in PCB design. There are no XTR101 reference design files in TI product website.
Can anyone send XTR101 reference design files (schematics and PCB)?
Part Number:TL441
Hi there,
I built the same circuit shown on Fig 15 but couldn’t exhibit such a good linearity (except for between 0.01V and 0.5V DC) so i got two questions:
1. Would you give me some examples for variable resistors parameters?
2. Is this datasheet actually reproducible? I doubt such a good linearity of this shown figure because I couldn’t reproduce it.
Is anyone use TL441 like this?
Thanks in advance.
Part Number:INA333
Hi all,
I have a general question regarding the signal conditioning of a 10kOhm Bead Thermistor. What is the recommended option for best accuracy to interface to a standard ADC within a micro controller. Would it involve a wheatstone bridge and then an instrumentation amplifier?
Thanks in advance!
Part Number:INA333
I am using the INA333 in-amp in an analogue board to amplify a sensor signal before AD conversion. Below is the schematic of the prototype board and the outline of the copper pathways on the PCB. The names and values of the elements are on the schematic.
The in-amp is powered with -0.231V on the negative power terminal and 3.3V on the positive power terminal. I have checked these multiple times. According to the data sheet, the amp should be able to provide outputs between -0.225V and 3.25V, however what actually happens is presented on the screenshot below (blue is input signal, yellow is output pin of in-amp). The signal can reach the negative rail, but it is capped at 0.45V when driven towards the positive rail. Furthermore, for sufficiently large signals I can see that the output can still be pulled up beyond that sudden “cap”. It is as if the in-amp works in two distinct linear regions: one between -0.23V and 0.45V and one above 0.45V. This is visualized on the oscilloscope screenshots below as I am increasing input signal amplitude.
The RG is 390 ohm, which should provide a gain of 256. The range measured when testing the circuit is similar, and this does not seem to be a problem. Reference is set to ground and I have been driving the in-amps directly from a signal generator. The result was the same whether the signal generator was grounded to the board or not.
I get the same result for all three amplifiers which can be directly connected to the signal generator. Please ignore the part of the circuit that incorporates the multiplexer.
I would greatly appreciate help in solving this issue. Thank you.
Part Number:AMC1301
Dear Sir, Madam,
My customer is facing issue during reflow process.
According to the MSL Ratings and Reflow Profiles Application Report, the reflow process is above 150 degree Celsius. The cut tape melting after insert into oven at temperature 125 degree Celsius.
If the part transferred into tray, the part will not have proper packaging after baking process.
Please advise suitable temperature & time for baking component in cut tape without taking out the part from the tape.
The package thickness is max 2.8mm and volume is max about 126mm3. According to the MSL Ratings and Reflow Profiles Application Report, the condition for reflow as below. Please correct me if there is any misunderstanding.
