Hi Tjerk, Katlynne is out of office so I will be taking over this question. Testing the EVM in the lab I do see large glitching on the DAC pins when SDO is enabled, but not when SDO is disabled. I've brought this up to the designers and I'll let you know if this is expected or not. In the meantime, you can mitigate the noise on the DAC outputs by installing an RC filter on the DAC and SDO pins. Thanks, Erin
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Forum Post: RE: DAC80508: Noise on all DAC pins when using SDO in daisy-chained setup
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Forum Post: RE: AMC7891: Tolerance or Max/Min for REF Voltage
Hi Chris, The reference over temperature plot gives a general idea of the reference variation. +/-5mV would be a safe bet for reference variation, but the actual variation is likely to be much smaller. Thanks, Erin
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Forum Post: RE: ADS131M06-Q1: ads131m02
Sorry to keep bugging you about ADS131M06 DRDY not changing. We were able to get the ADS131M02 to work perfectly. We are sending 8 frames. Attached is schematic of the ADS131 in the bottom left of the attached PDF. Is the wiring incorrect? Does DRDY require a pull-down resistor? DRDY NEVER CHANGES EVEN WHEN DISCONNECTED FROM THE uC after we send the SYNC. DRDY never goes low. We have replaced the ADS131 several times. The ADS Does return data so it is alive. It always returns 1st byte = 280000 so STATUS=CRC change + no new data. DRDY never changes but it returns the 1st byte. Scope plots show CLK right after SYNC but even after long delya, DRDY never changes. Keysight scope is not an easy to use logic analyzer. A PC based logic analyzer probably makes more sense. Do you have one that your prefer such as Saleae? We have spent Hours trying to make the ADS work. We are tempted to scrap our design and try another A/D. ==Is wiring correct? ==Does it require Init of registers or reset pins to get DRDY to work? ==Is there an easier 6 channel API A/D? e2e.ti.com/.../ADS131schematic.pdf
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Forum Post: RE: TXB0108: TXB0108 - Open drain pin support
Hi Jeeveth, The internal 4kohm resistors exists on A and B side and open drain drivers needs pullups on both sides of the translator to interface properly. To reduce complications and ensure compatibility, this is why TXS is strongly suggested over the TXB for open drain level shifting applications. Regards, Jack
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Forum Post: RE: AFE881H1: Slew time of sinusoidal mode
Shota-san, The generation of the Sinusoidal Slew is a bit complicated, and I'm looking into it. I'll check to see if I can generate a closed-form solution for the slew time. I'll be looking over the digital code and discussing this with one of the digital designers. Joseph Wu
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Forum Post: RE: ADS1298: DRDY pin not going low although the other functions working well
Hello Khoi, My apologies for missing your post. Do you still need help with initializing the ADS1298? Regards, Ryan
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Forum Post: RE: ADS7142: Use as standard ADC
Thanks Joel, I will look at ADS1015L. That didn't some up in my search. I am surprised at the lack of I2C 1V8 ADC ICs around. I don't need fast sample rates. It is a dc voltage that will be measured hence the 100nF at C131. Much appreciated Derek
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Forum Post: RE: ADS7142: Use as standard ADC
No problem! Out of curiosity, can you expand on the 1.8V I2C requirement over 3.3V? What kind of I2C controller are you using in your system? We would definitely like to make more of our devices compatible with 1.8V I2C based on the need.
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Forum Post: RE: AFE11612-SEP: Queries Regarding ADC Reference, ENOB, AVcc, and Remote Temperature Inputs
Hi Dhir, 1. You can estimate TUE (total unadjusted error) by taking the root-of-summed-squares of the error sources together. You will need to convert to common units, like %FSR. So, for example: ADC TUE(%) = sqrt(OSE^2 +GE^2 + INL^2 + REFERR^2) where OSE is offset error, GE is gain error, INL is INL, and REFERR is your reference error. This is a good way to estimate when TUE was not measured directly on the device. Note that INL is pretty much reference independent, but GE is increased with reference error. 2. OSE will not change really with a different reference voltage, but you could expect GE to be additive with reference error. 3. I will let Erin comment here. 4. Unused DACs can be left floating. Thanks, Paul
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Forum Post: RE: ADS131M06-Q1: ads131m02
Hi peter, Where is your input clock to the ADC (pin 23 - XTAL1/CLKIN)? I could not find it in your schematic, your ADS131M06 symbol does not have this pin 23 and pin 22 (XTAL2). Saleae is a good tool. BR, Dale
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Forum Post: RE: ADS131M08: Drivers and support (Linux)
Hi Clark, The timing requirement for ADS131M08 and ADS131E08 are quite different. I'm not sure if you found these files on Github. If so, you can find more information over there: To interface the ADS131M0x devices with a microcontroller (MCU), the firmware or software engineer needs to know how to correctly configure their MCU's serial peripheral, sequence the serial commands, and control the SPI timing of command bytes to the ADC. Provided code examples in hal.c functions utilize the TI SimpleLink SDK and allow for quick integration with TI SimpleLink MCUs. You can also find the example code in C on TI.com . BR, Dale
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Forum Post: RE: ADS1015L: Inquiry about the device use case
Hi JH Shin, The ADS1015L certainly fits this description. Is the I2C bus 1.8V? ADS1015L supports 1.8V I2C bus, otherwise you could simple use the non "L" ADS1015 if 1.8V I2C bus support is not needed. Are there any additional requirements? What is the application? Best Regards, Angel
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Forum Post: DAC7644: The marking of DAC7644E problem
Part Number: DAC7644 Tool/software: Hi Engineer, Based on the data sheet, the part DAC7644E should be with marking "DAC7644E B ", and the part DAC7644EB should be with the marking "DAC7644E", which is no letter B. Could you help check if this is correct? Is there an error in the datasheet? Thanks, Suri
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Forum Post: DAC39RF10-SP: Inquiry on how to apply code carrier coherence
Part Number: DAC39RF10-SP Tool/software: Hello, My customer wants to apply the following code carrier coherence to DAC39RF10-SP. Q1. If you have any reference materials for implementing this feature in DAC39RF10-SP, please share it. Q2. They thought that they could implement this feature using the JESD204C LSB Synchronization of the DAC39RF10-SP. Is it correct? Thank you. JH
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Forum Post: DAC5681Z: How to increase output gain.
Part Number: DAC5681Z Tool/software: Hello all, I'm using DAC5681Z to make a frequency, however the output power is small. So, I'd like you to tell me how to increase the output power. I want to generate 10KHz sine wave (one tone). Below is my snapshot image. Spectrum Analyzer : Oscilloscope : Schematic : Register setting value is default value.
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Forum Post: RE: DAC8831: noisy output
Hi Erin, Thank you for your reply and for sending the DAC recommendation. This is very helpful! Best regards, Chen
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Forum Post: RE: ADS7028: Read and Write Issue with ADS7028
Hey Joel, To zoom in more, I divided them both into two parts. One for read register command and one for the result. They might be a little different than old pictures, it is acting strange as I said. And this is the most I can zoom in, more than that and the data won't fit into the screen. First query: Second query: The coming data part is just acting strangely. I am not sure if we have a logic analyzer though. For the rise time of SDO, I implemented delays in us between chip select toggles to make sure that the device can acquire what is going on. I believe they are 5 us before and after the chip select toggle. For pull-ups we have 10 kohm resistors on chip select lanes. Thanks, regards.
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Forum Post: RE: ADS7142: Use as standard ADC
Hi Joel, We are using a AMD Ultrascale+ MPSoC which has the bank supplied with 1V8. Regards Derek
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Forum Post: ADC12DJ5200RF: ADC Error Calculation
Part Number: ADC12DJ5200RF Tool/software: While calculating error percent in ADC circuitry, should I be worried about resistors connected to ground or the caps to ground in RC filters. I understand series elements can introduce errors, but if in parallel how does it affect.
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Forum Post: RE: AFE11612-SEP: Queries Regarding ADC Reference, ENOB, AVcc, and Remote Temperature Inputs
Hello Paul, Thanks for sharing. Could you please let me know how can I terminate unused DACs? I don't want to leave them floating. Also, I am hoping that you can also help me with below questions: The device includes two remote temperature sensing channels. Is it possible to use them as general-purpose differential ADC inputs? Additionally, can they be used for interfacing a thermocouple? I would also like to understand the power supply sequencing requirements. My planned configuration is as follows: AVDD = DVDD = AVCC = 5V IOVDD = 3.3V VREF = 2.5V Does the sequencing of these supplies matter? If yes, could you recommend a way to minimize the number of power supplies needed? I’d prefer not to use four separate regulators if it can be avoided. I am planning to calibrate the ADC. Could you please confirm whether the error characteristics are the same across all channels, or if each channel needs to be calibrated individually? Additionally, if I’m using two separate ADC ICs, would each IC require individual calibration? Regards, Dhir
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