https://e2e.ti.com/support/amplifiers-group/amplifiers/Find answers, share knowledge, solve problems with fellow engineers.en-USTelligent Community 13https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648232/ina196-clarification-required-on-ina196aidbvr-current-measurement-test-setup/6359682Tue, 26 May 2026 23:02:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7709ee07-cf2b-43ff-bc39-6f661092a3eaJoe VanacoreHello Chetan, Yes this is the proper way to implement low side current sensing. I would still encourage you to measure the voltage on each side of the shunt before soldering the INA196 onto the board. The recommended common mode voltage needs to be adhered to. I hope this helps, Joehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648733/pga855-simulating-pga855/6359638Tue, 26 May 2026 22:27:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2a0530cc-70f9-41e5-8976-ddf6bce57382Caro GomezHi Amir, Since there were several issues with the SPICE model convergence of the PGA855, it has been pulled from the web, and evaluation is encouraged with the evaluation module. Is there some specific behavior you had a question about? PGA855EVM Evaluation board | TI.com All the best, Carolinahttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649081/pga854evm-doc-cert-pga854-pspice-model/6359636Tue, 26 May 2026 22:25:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c455b025-7114-4397-9372-6da036141ea1Caro GomezHi Amir, Welcome to e2e and sorry for the delay in response as yesterday was US Holiday Yes the library file can imported in PSPICE, here is a video example: PSpice for TI: 3rd Party Model Import | Video | TI.com Here is also the library file from the TINA model: e2e.ti.com/.../PGA854_5F00_Sim_5F00_Model.txt I am not sure why it is not currently located in the PGA854 product page, I will add it. The PGA854 is available for purchase directly on ti.com - the unit price seems variable to the amount purchase and the custom reel has a $7.00 fee. Here is the price matrix on the PGA854 product's page: All the best, Carolinahttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649111/opa2277-msl-labeling-discrepancy-msl2-vs-msl3/6359634Tue, 26 May 2026 22:25:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:828ac349-d5ee-424d-a018-abd4d6d9c744Michael HartshorneHello, Agreed with Clemens. The MSL level is usually determined by the packaging and packaging site, and during the wafer transition a new packaging site was used. The new site upgraded to MSL level 2, but the data sheet did not get updated to MSL level 3, because some devices are still in stock that could still have the older site MSL level (3). The label on the package is the correct MSL level for the devices inside, the data sheet only shows the lowest possible level. Hope this answers your question. Regards, Mikehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649566/tas2505evm-noise-on-tas2505evm-board-at-16khz-wclk-and-external-master/6359596Tue, 26 May 2026 22:02:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:14eb7522-d9d7-4909-8c35-1649f19d0025Isaac BulivaHi Danilo, I'll check this and get back to you soon. Regards, Isaachttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649135/lm741-lm741cn-nopb-lm741cn-nopbg4-temperature-range/6359591Tue, 26 May 2026 21:59:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:4b1fd393-43fe-471a-a5e3-82c7ce7a7947CarrieHi Hiroaki-san, This looks be an error. The LM741CN/NOPB is capable of -40 to 85C operating range. Please let me know if you have further questions. Best regards, Carriehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648898/tl103wb-the-calculator-for-cc-cv-circuit-design/6359572Tue, 26 May 2026 21:48:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:f63c7a60-f301-4f93-b7a6-e854e0d8f3beChris FeatherstoneHi Kailun, I believe you are referring to this app note? https://www.ti.com/lit/ab/slla619/slla619.pdf?ts=1779831292627&ref_url=https%253A%252F%252Fwww.google.com%252F I have reached out to the engineer that created this app note to see if a calculator exists for this design. Best Regards, Chris Featherstonehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648898/tl103wb-the-calculator-for-cc-cv-circuit-design/6359544Tue, 26 May 2026 21:34:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:955e1883-419d-40ad-a3df-4976a036c808Chris FeatherstoneHello, I am not sure what the calculator is that you are referencing or what the CCCV circuit design is. Do you have more information to help us identify what this is? Best Regards, Chris Featherstonehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648479/tl064a-quality-issue---tl064acdr/6359543Tue, 26 May 2026 21:32:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7c9e07ac-e722-40e0-9d1c-40943068b999Chris FeatherstoneHello, The TL064 has transitioned from the our old 150mm FAB to our 300mm FAB. Please note that there was a product change notification that was sent out for this device on July 14, 2023 indicating a design change. https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5485/PCN20230713001.1.pdf Can you help us understand what is failing in your circuit and provide a schematic? Best Regards, Chris Featherstonehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1646049/lmp7721-lmp7721-lmp7715-based-afe-for-ph-and-orp-sensors-guard-ring-supply-architecture-and-bnc-guard-signal-questions/6359536Tue, 26 May 2026 21:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:bb488f52-9258-44da-b09c-762ee6bdd33fPaul GroheHello Uilter, You are asking some very complicated questions. We need some time to digest it.. First, please see my "Femtoamp" articles. This is a good start and answers some of your basic questions. https://www.edn.com/design-femtoampere-circuits-with-low-leakage-part-one/ https://www.edn.com/design-femtoampere-circuits-with-low-leakage-part-2-component-selection/ https://www.edn.com/design-femtoampere-circuits-with-low-leakage-part-3-low-current-design-techniques/ There is a appnote for pH sensors: https://www.ti.com/lit/pdf/snoa529 We do have some AFE's for pH sensors. The LMP91200 front end is based on the LMP7721 and also has the guard driver. https://www.ti.com/product/LMP91200 This Bluetooth Sensortag TI design uses a LMP91200 and a pH sensor. You can get some design ideas from this... https://www.ti.com/lit/pdf/tidua47 The sensor in the 1852 pH appnote did not have a triaxial cable and had a "normal" BNC connector (tip and shell). The shell was driven by the refernece buffer amp. This meant the shell was at 500mV above ground and had to be protected from shorting. Remember that the pH probe outputs a bipolar voltage in reference to the shell. So simply "grounding" the shell with a single supply would not work as the output cannot swing below ground. If you could get a negative supply, then you could "ground" the shell as the buffer could accept negative inputs. We do have devices that will generate a negative supply, such as the LM27761 . But you will need to level-shift the output above ground to stuff into a ADC. The LMP7721 is NOT rail-to-rail input, and has a input voltage limitation of V+ - 1.3V. So at the positive end you are limited by the upper voltage limitation, and at the lower end, you are limited to the minimum output swing of the output (20-60mV). There is a newer version of the LMP7721, the OPA928 that has a R-R input range and eliminates the VCC-1.3 issue. Have a look at that one, too.https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648693/ths6012-ths6012-sloppy-looking-lettering-and-logo/6359435Tue, 26 May 2026 20:34:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:02090f58-6e5c-4645-a448-18719ea43b07Evan KirkbrideHi Adam, The format of the lot trace code looks correct, however when I look up that code I'm getting a different device, not the THS6012. To be sure, I would fill out this form: https://www.ti.com/lit/ml/ssdl004c/ssdl004c.pdf and upload it to the customer support: https://www.ti.com/customer-support/request-form I think Product Information --> Part Marking Lookup Tool (using the tool doesn't seem to help)-->still need support would be the best bet. You can say I directed you with this e2e thread and copy it. Have you seen any performance differences between this batch and the other batch? Thanks, Evanhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1644592/ina129-ht-ref-pin-input-range/6359425Tue, 26 May 2026 20:26:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:245b4917-0871-4d53-a184-6282a08dcedaRobert Clifton56Hi Marvin, [quote userid="510099" url="~/support/amplifiers-group/amplifiers/f/amplifiers-forum/1644592/ina129-ht-ref-pin-input-range/6358842"]Could you please specify the Voltage input Range to this pins? Whether it is rail to rail input? or minimum 0.7V needed to operate?[/quote] Of course! Also I realized that I made a mistake. The range isn't symmetrical. It's actually (V-) + 0.1 <=VREF<= (V+) - 0.7V . [quote userid="510099" url="~/support/amplifiers-group/amplifiers/f/amplifiers-forum/1644592/ina129-ht-ref-pin-input-range/6358842"]Regarding the minimum voltage to the ref pin, does the pin support 0.00V to 0.1V (0-100mV input range)? The customer would be injecting the reference/correction voltage in the range of 0-50mV range.[/quote] Let's take a look at the customer's schematic, where the supplies are 0V and 4.5V. That would mean that the input range for the reference pin is 0.1V <=VREF<= 3.8V . This shows that the ref pin doesn't support 0-0.1V range with the current supplies. I'd recommend adjusting the supplies to support a lower reference voltage or changing the reference voltage that's being injected in it. Best Regards, Robert Cliftonhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649567/tlv9001-pinout-tlv9001idckr-in-sc70-5-package/6359329Tue, 26 May 2026 19:23:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2f3c4618-4c2f-46c4-ac14-3eae5bfac849Marek LisBelow please see TLV9001 SC70-5 package pinout diagram:https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649573/opa814-simulate-gain-stability-for-ninv-opampTue, 26 May 2026 19:16:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:f0bd1a43-82ec-4af4-a1c1-203920c54e5eDennis BrownPart Number: OPA814 I have a design that uses the OPA814 configured as a unity gain buffer but it wants to oscillate when the feedback resistor is a 0 ohm short (the other resistor to ground being an open). It will stop oscillating once a 50ohm resistor is installed in the feedback. Seems there is limited phase margin here but I would like to know more about the analysis from tina. In tina, how does one simulate open loop stability or closed loop stability for an opamp configured in a noninverting format? Would like to see gain (dB) and phase margin (deg). Closed loop gain/phase is easier as this is what is in my tina file attached. There is nothing obviously wrong in closed loop format here to me. There are a couple videos on the TI website that show similar concepts but not necessarily like this problem. If you have a link to something similar please post it. For the record the attached file does not show any sort of oscillation but I just want to know how to extract out gain/phase information under AC analysis so I have a better grasp on the problem. OPA814_TINA_stability.TSCOPA814https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649567/tlv9001-pinout-tlv9001idckr-in-sc70-5-packageTue, 26 May 2026 18:53:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:5dbfb2cc-f4bd-4ee6-8b75-0cfb69e4ab04Michael GendelsmanPart Number: TLV9001 I need pinout of TLV9001IDCKR in SC70-5 package.TLV9001https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649566/tas2505evm-noise-on-tas2505evm-board-at-16khz-wclk-and-external-masterTue, 26 May 2026 18:39:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a026914c-8486-4955-b680-3297eda89b67Danilo A.Part Number: TAS2505EVM Other Parts Discussed in Thread: TAS2505 Hi Team, Posting on behalf of our customer. I'll share this E2E post with our customer so he can reply when needed. I am currently working on I2S communication between an EFR32 device and the TAS2505 EVM board, and I encountered an issue when using a 16kHz sample rate. As I understand, WCLK should be equal to the sample rate. In my case: WCLK = 16kHz Word length = 16 bits Stereo audio Therefore BCLK = 512kHz The issue is that the audio output from the TAS2505 speaker contains noticeable noise/distortion (“buzzing” or “crackling”) when operating at 16kHz. However, when I increase the sample rate to 44.1kHz or 48kHz, the audio becomes much cleaner, which seems expected. What is strange is that with exactly the same firmware, same audio data, and same 16kHz configuration, another DAC/amplifier (MAX98357A) produces very clean and clear audio output. So I would like to confirm a few things: Could this issue be related to differences in the hardware architecture/design between TAS2505 and MAX98357A? Is it expected that the TAS2505 EVM board may produce more audible noise or degraded audio quality when operating at 16kHz sample rate? The TAS2505 EVM board includes the TAS1020B onboard USB interface, which seems to run with a default 48kHz audio configuration. Is there any application, firmware tool, or method available to modify the TAS1020B firmware/configuration so that the board can operate with 16kHz WCLK instead of the default 48kHz? I would like to test whether the issue is related to clock synchronization or USB audio configuration. Additional information: I configure the TAS2505 EVM through the CodecControl application. My configuration script is similar to the Class-D example script. I only changed the divider settings: NDAC = 1, MDAC = 6 or NDAC = 2, MDAC = 3 Regards, DaniloTAS2505Home theater & entertainmentTAS2505EVMhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649313/ina849-analog-potentiometer-to-control-gain/6359204Tue, 26 May 2026 18:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:670692af-c672-4483-ac18-a18ed0b9c3d2Robert Clifton56Hi Alvaro, I have a few questions. Is a manual (where someone manually adjusts it) potentiometer acceptable? Was there a reason that you wanted to use a potentiometer rather than using a programmable gain amplifier? Best Regards, Robert Cliftonhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648458/tlv9022l-tlv9022l-pspice-lib-file-simulation-error/6359142Tue, 26 May 2026 17:47:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:4e1d9ea4-d30c-4b4b-971a-5d7e7f98efd4Marek Lisdonehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1648830/lm111-date-code-decode/6359124Tue, 26 May 2026 17:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a3af2f38-f732-4284-9de2-48f3402e74d4Paul GroheRon, MD8 is Military (883) bare die. In our systems it would be looked-up as LM111-MD8 (dash instead of space). Karthik, 42AHS91 This is a valid lot from Feb 24th 20204 from the Philippines test site. The "42" is the last digit of the year (4) and the month (2=Feb). AHS9 is an internal lot trace code and has no meanings outside of TI. Nothing to "decode". The "1" is the assembly site code (1 = Clark A/T). The die is the ex-National Semiconductor die.https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1649494/tlv3901-question-regarding-tlv3901-latch-functionality-and-tina-model-behavior/6359111Tue, 26 May 2026 17:33:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:75558223-5f88-4b03-9a62-7f1fa533f4e7HO SIUHi Hadi, You are correct. There is currently an error in the model where the internal 50Ω pull up to VCCO are not implemented. This will be fixed in the next iteration of the model. For the resistor to GND on the LE pin, it depends on your VCCO. If you're using a 3.3V VCCO, the 500Ω resistor should apply a -300mV differential between LE and LEB so this should be valid configuration.