Hi Will, See the feedback below. 1&2: Regarding your assumption, you need a filter on the power supply. The cutoff frequency depends on the noise and transients observed on your power supply. You can find ADS131M02's PSRR specification from the datasheet, it is around 88dB rejection at DC and 78 dB rejection for 50Hz or 60Hz frequency. The more noise or transients you can filter out, the less error will be seen in your code. Unfortunately the datasheet does not have a graph of PSRR vs frequency. However, it is very worth using a low noise LDO as the AVDD power supply to the ADC. 3&4: When AINxP and AINxN pin of the ADC are connected to the secondary output of CT, each pin will have a signal with an opposite phase corresponding to the ground (GND). The split-burden resistor configuration ties one lead of the resistors to GND, such a configuration can guarantee both signals have completely opposite phase if the burden resistors have the exactly same value. Below is a simulation example I just did in TI-TINA , the phase difference between the signals on AINxP and AINxN after the burden resistors is exact 180 degree. The split-burden resistor configuration is usually used for differential measurement since the ADC measures the voltage difference between AINxP and AINxP. The split-burden resistor configuration can also lead to less offset and harmonics so the best THD performance can be achieved. Regards, Dale
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Forum Post: RE: ADS131M02: AVDD and DVDD Filtering/Impedance Matching
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Forum Post: RE: ADS122C04EVM: Reading temperature and connecting a wheatstone bridge
Hi Bjorn, It may be helpful to take a look at our Temperature-sensor (RTD, thermocouple, thermistor) firmware for precision ADCs: ADC-TEMP-SENSOR-FW Application software & framework | TI.com This temperature-sensor linearization firmware provides a software routine for measuring and linearizing most common temperature sensors, including resistance temperature detectors (RTDs), thermocouples, thermistors (NTC, PTC, etc.) and analog temperature sensors. I also suggest taking a look at our app note: A Basic Guide to Bridge Measurements (Rev. A) (ti.com) , for additional information on bridge measurements. Best Regards, Angel
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Forum Post: RE: ADS8167: ADS8167 could not communicate with SPI
Hi Emrullah, The ERROR bit may be useful to make sure configuration is done correctly. But you may need to fly wire a wire to the SEQSTS, ALERT, READY pins to monitor those as well. You may try manual mode as well as a test. What are your AVDD, DVDD and AINP/AINM voltages? Could you share a oscilloscope screenshot of the digital lines? Best regards, Samiha
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Forum Post: RE: AMC1210: is it possible to handle two resolvers with one chip
Hi Yurii, If you read through the application note I pointed you to, the calibration looks for a zero-crossing to compensate for phase differences. I'm not sure how easy that is going to be when using two resolvers.
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Forum Post: RE: ADS1298: Unable to see status word in data retrieval
Dear Ryan, Thank you for the getting back to me. I have all the START pins tied together and controlled by a microcontroller. Just before reentering RDATAC mode, I pull the START pin HIGH to start conversion. That's why the DRDYn pin toggles at the right data rate. Is it okay to control the start/stop of conversion using both the START pin and START/STOP command, or I should choose one of them and stick to it? I double checked the design and there is no other pins attached to DOUT other than the MISO pin from the microcontroller. So I don't think DOUT was loaded by other signals than the ADCs. Regarding the data sent from the ADCs, am I correct to assume the ADCs should not return anything during read/write register commands and only reply with data after seeing a complete read/write command? I noticed that DOUT reads 0x60 during the first Byte of a channel register read. However, this only happens starting from reading the 2nd channel register. The ADC did not reply anything in the first Byte during the first channel register read. And thanks for the tip on writing to all the ADCs together! Best, Aiden
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Forum Post: RE: ADS124S08: BOCS switched off while converting?
Dear Bryan, Thanks, that's very helpful. I want to test the exact same configuration in my design. Can I ask you for more details on this? Is it possible for you to give me the complete configuration registers? Especially 03h (PGA), 04h (DATARATE), 09h (SYS). How long did it take to get the 200 samples? is DATARATE.MODE set to Single-shot or Continuous conversion mode? Best regards, Andres Luder
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Forum Post: TX7364: Detailed onformation
Part Number: TX7364 Tool/software: Where it is possible to get the complete data sheets of the TX7364, application notes, reference design, EVM schematics, etc.?
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Forum Post: RE: ADS1263: Do we have any software example to calculate current using ADS1263 in diff end mode ?
Hi Bryan, I have tried again as you requested & found that ADS1263 is now working properly. I did not get the reason but It is responding with the correct hex codes.
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Forum Post: RE: ADC3683-SP: Hardware Design Files
Thank you
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Forum Post: RE: ADS1015L: voltage on Vin pin
Dear Sanjeet, the maximum pin voltage for the analog inputs is given in the "Absolute Maximum Ratings" in the ADS1015L datasheet. It is VDD + 0.3V. If you apply an analog input voltage to AIN0 while no VDD supply is provided, then the ESD diode between AIN0 and VDD will conduct and power up the VDD supply. Regards, Joachim Wuerker
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Forum Post: ADS52J90: ADS52J90EVM
Part Number: ADS52J90 Tool/software: Hi, I cannot start the application " SLOC326 — HMC-DAQ GUI, v2.8" on my windows 10 enterprise? I tried the already availabe solutions in the forums but they donot work in my case.
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Forum Post: RE: ADS131E08S: ADC (24Bit) Recommendation Inquiry
Hi, Joachim We will respond with the information confirmed by the customer. - Battery Pack voltage : ± 1000 V - Battery Pack Current : ± 1000 A - Cell Voltage : ± 5 V - Cell Current : ±300 A - Channel count : At least 4CH or more - Multiplexed or simultaneous-sampling ADC? : simultaneous-sampling - Data rate per channel? : The bigger the better. - Interface (SPI, I2C, parallel)? : It does not matter whether it is SPI or I2C. It is good if it is suitable for PID control. - Input voltage range that needs to be measured? : Vref around 5V - AEC-Q100 qualification required in case this is an automotive application? : Since it is a Battery Tester (charging/discharging), it does not have to be Auto (AEC-Q100). Please check. Thanks.
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Forum Post: ADC12QJ1600EVM: ADC12QJ1600EVM
Part Number: ADC12QJ1600EVM Other Parts Discussed in Thread: LMK04828 Tool/software: hello, I am confused -Refiring to ADCxxQJxx00EVM data sheet - the input to CLKIN1 (see image) can be between 500-1600Mhz input. The data sheet of the LMK04828 claim max input clock to CLKIN1 pin is 750Mhz. what I do not כשןך אם understand? I want to work with 1Ghz clock. Regards, Giora
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Forum Post: RE: LM98714: Schematic check
My customers want to use the AFE_LOW_VSMP signal to trigger the operation. Please help to check the schematic. Thanks!
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Forum Post: RE: ADS52J90: ADS52J90EVM
Hi, You can refer to this e2e solution https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/771753/afe5818-hmc-daq-gui-error-1003
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Forum Post: ADS8588S: Can a “SAR + digital filter” behavior similar to a delat-sigma？
Part Number: ADS8588S Tool/software: I am learning the basic operations of SAR and delta-sigma ADC. It is clear that delta-sigma has better noise performance due to its oversampling and internal digital filter. I wonder that if I add an external digital filter to a 16bit SAR, and set the sampling frequency the same as a 16bit delta-sigma ADC, what will be the result of the comparison between two systems' performance? And what is the difference between two systems. Thanks!
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Forum Post: RE: ADS52J90: ADS52J90EVM
Thanks for quick reply but I tried that solution and it did not solve my issue. I tested in two different laptops.
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Forum Post: DAC122S085: Do we have EVM & noise performance ?
Part Number: DAC122S085 Other Parts Discussed in Thread: DAC7811 Tool/software: Hi TIer Do we have DAC122S085 EVM available? Customer want to evaluate this chip for noise performance. Application is Medical - Ultrasound image - TGC circuit. Could you give some comment on noise comparison between DAC122S085 and DAC7811. Thank you very much.
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Forum Post: TPS560430-Q1: Please make sure the given connections are correct for the regulator.
Part Number: TPS560430-Q1 Tool/software: e2e.ti.com/.../1.5V_2C00_600mA-Reg.pdf
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Forum Post: RE: ADS5294: Does my signal need to be stabililed before the aperture delay?
Hi, Your methodology should be fine. You can say sample at 20ns and after aperture delay sampling will happen. Also in the datasheet you can see there is a spec for aperture delay variation (2.5ns) . So considering this you have to calibrate each device . One more point to consider , device has 550MHz input bandwidth. Your analog pixel output bandwidth should be less than that to sample the point correctly . One general question : Why are you particular about sampling point . Your input information is preserved if you follow nyquist rule . What would be the analog pixel output bandwidth ?
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