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/1695672/am2754-q1-usage-of-fir-library-calls-for-fir-computationThu, 05 Nov 2026 12:57:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:164eaa41-8708-4dee-9700-368e710b5658Abeezar VasiPart Number: AM2754-Q1 Hi, I have written a simple code to be able to use TI FIR filter library. However, I am seeing zeros in the output. Please check and let me know why do I not get proper values? fir_example_ti_forum.cAM2754-Q1Infotainment & Clusterhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695667/ina226-maximum-voltage-on-alert-pinThu, 05 Nov 2026 12:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:31772280-97b1-45a0-a433-526b11f89562Guillermo AscencioPart Number: INA226 Can anybody clarify what's the maximum voltage on Alert pin for the INA226? ThanksINA226Aerospace & Defensehttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695656/opa171-failure-of-opa171-when-using-in-a-tia-schmitt-triggerThu, 05 Nov 2026 12:25:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:be422b12-7b28-4559-a506-fa65edb6a896Matthias NösslerPart Number: OPA171 Other Parts Discussed in Thread: TVS3300 I am curently working on a circuit to convert the signal from a light reflex sensor on the left into a digital signal that can be used by a handheld insturment. The problem is not quite the function of the circuit itself, because if it is working, everything works exectly as I want it to. However the problem lies in the OPA171 dying for some reason we can't figure out. We already tried to activly cause the problem/test for it by: intentionaly introducing ESD with touching/rubbing the pins on clothes and so on. Heating and cooling the circuit far beyond the itended usecase. Shortcircuiting the outputs and inputs to the positive rail and ground. Only partial connections of the Pins by inserting the connects missaligned and therefor connecting the pins at differnt times. With none of those i could reproduce the effect of the dying opamps. In case it was stil some kind of ESD i also added TVS3300 to the power sopply and the data line on the right side of the schmeatic. Tho this didn't help either. If you have any idea for the cause of this problem, i would be vary thankfull for any help. If you need further details, feel free to ask and i will provide them as fast as possible. Thank you and kind regardsOPA171Industrial AutomationTVS3300https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1694120/tas6584-q1-shorted-load-sl-test/6531427Thu, 05 Nov 2026 11:29:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:b9daeb55-7fad-43d1-b722-b8b022974515Yanming GongI did not see any waveform. Please sent is through e-mailhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695639/tas2781-tas2781ryyr-pin-configurationThu, 05 Nov 2026 10:46:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8a246e93-3d25-4ed3-aca8-e9fdf07ef709Jaesung KimPart Number: TAS2781 Hello, I am designing a product with the TAS2781 and have a few questions about the pin configuration and external components. 1. pins 6, 8, 9, 26 Pins 6, 8, 9 and 26 are currently connected to GND through 0 ohm resistors. Is it acceptable to connect these pins directly to GND instead? 2. Output inductor current rating (OUTP/OUTN) Operating conditions: - Speaker: 5 W, 4 ohm nominal (Re approx. 3.4 ohm) - PVDDH: 12 V - Power mode: PWR_MODE2 What saturation current rating is required for the inductors on OUTP/OUTN? We are currently using 3 A inductors. Can this be reduced, and if so, what is the minimum recommended rating with adequate margin? 3. PVDDH decoupling capacitors We currently use 3 x 22 uF, 2 x 10 uF and 1 x 100 nF on PVDDH. What is the recommended total decoupling capacitance for PVDDH under the conditions above? Can the current configuration be reduced? Thank you for your support.Industrial AutomationTAS2781https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1694810/op07-op07cp-functional-difference-between-pre-2023-and-post-2023-production-lots/6531284Thu, 05 Nov 2026 08:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:96d0bdfb-5602-40ef-9aa0-ab7b4db689f1Simona FischerHi Alex, Thank you for your quick response and for taking the time to recreate the circuit in TINA-TI. I am currently coordinating the investigation internally and collecting the requested technical information from our engineering and test teams. We are gathering additional details regarding: The exact behavioral difference between the working and non-working OP07CP lots The connections and function of header X3 The voltages applied to TWW-a and TWW-b Any available measurements around the OP07CP and LM311 stages As soon as the information is available, I will provide a detailed update. Thank you again for your support and for looking into this issue. Best Regards, Simonahttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695571/tas3251-tas3251-audio-dropoutThu, 05 Nov 2026 08:26:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:db326898-1dd3-4c4b-832d-f84a85570e61Mohammad NaghizadehPart Number: TAS3251 TAS3251 audio dropout during Bluetooth I²S playback I am designing a custom amplifier using a TAS3251 with a BT1026 Bluetooth module as the I²S audio source. The BT1026 is configured as the I²S master: Sample rate: 44.1 kHz BCLK: ~2.8224 MHz LRCLK: ~44.1 kHz BCLK/LRCLK ratio: 64 I²S data is present continuously MCLK is not provided (3-wire I²S) The problem is a periodic audio dropout, especially when the Bluetooth/phone volume is increased. (audio doesn't have problem in the lower volumes but the issue appears when i increase the volume) Measurements during the dropout BCLK and LRCLK remain present and appear normal. SDIN continues to carry data. PVDD remains stable. DVDD_REG remains approximately 1.8 V. RESET_AMP remains HIGH. DAC_MUTE remains HIGH. FAULT and CLIP_OTW remain inactive. PWM switching at the TAS3251 outputs continues with normal amplitude/frequency. Both differential audio outputs disappear simultaneously during the dropout. P0-R0x04 = 0x01 continuously. P0-R0x5E = 0x40 continuously, indicating MCLK missing, which is expected because I am using 3-wire I²S. P0-R0x5F normally reads 0x10 and changes to 0x11 around the dropout, indicating a clock error event (CERF). P0-R0x5B = 0x30, P0-R0x5C = 0x00, P0-R0x5D = 0x40, indicating a valid sample-rate range and 64× SCLK/LRCLK ratio. P0-R0x78 = 0x00 continuously. P0-R0x02 = 0x00. P0-R0x2A = 0x11. P0-R0x2B = 0x01. P0-R0x41 = 0x04. I also changed P0-R0x25 from 0x18 to 0x7D to ignore the clock-error detection conditions. I verified by readback that the register actually contains 0x7D, but the dropout remained completely unchanged. The same general dropout behavior has also been observed when using an STM32 as the I²S source, so it does not appear to be specific to the Bluetooth module. I would appreciate guidance on which TAS3251 registers or internal status signals I should monitor next to identify the source of the dropout. This is the output when a 800Hz audio is played: Also, this is my schematic file: TAS3251.pdfTAS3251Home theater & entertainmenthttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695570/lf412-there-is-a-difference-in-the-output-error-amplitude-of-the-lf412cp-between-lots-produced-before-and-after-the-issuance-of-pcn-20230608002-1Thu, 05 Nov 2026 08:25:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:68334a8f-3976-48d3-881f-eff23f0d98cfKatsuyoshi YamanishiPart Number: LF412 In our system, operation was stable when the output was set to 5 V ± 0.2 V . However, issues occurred when it was set to 5 V ± 0.5 V . Rather than implementing a temporary workaround, such as adding circuitry to increase ESR, we would like to identify the root cause of this issue. PCN 20230608002.1 states that the changes involved adding a front-end manufacturing process at a new facility and changing the bonding-wire material. The PCN also states that these changes would have no impact on the product’s electrical characteristics. However, we have observed apparent differences in the chip, circuitry, and bonding wires between the units. Could the differences between the lots listed below be related to the changes described in PCN 20230608002.1? The pre-change unit (Lot No. 95A4G7M) operates at 5 V ± 0.2 V , whereas the post-change unit (Lot No. 4CA1DVM) reaches 5 V ± 0.5 V . An oscillation at 8.5 kHz , with an amplitude of approximately 1 Vpp , is observed. X-ray inspections were performed. The images on the left show normal units (Lot Nos. 46AG66M and 95A4G7M), while the image on the right shows a unit exhibiting the larger amplitude (Lot No. 4CA1DPM). (See attached image 1.) We measured the oscillation using an oscilloscope while the output was set to 5 V. The measurement was taken between TP1 and TP3, as shown in the circuit diagram. (See attached image 2.) C28 is a ceramic capacitor. No issues have been observed with C28, including in units from the initial production run. The oscilloscope waveform between TP1 and TP3 (GND) shows oscillation around 5 V. (See attached image 3.) Could this phenomenon be caused by a change in the chip or by a change in the diameter of the bonding wires? We would appreciate your investigation and feedback. Thank you.LF412Test & Measurementhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695555/lmh6518design-calc-request-for-ibis-model-lmh6881sq-nopbThu, 05 Nov 2026 07:50:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:988e74c0-9b43-497b-8d8a-8a4aaa9b6279Kavitha HTPart Number: LMH6518DESIGN-CALC Dear Texas Instruments Support Team, We are currently working on a PCB design using the LMH6881SQ/NOPB programmable differential amplifier. We are performing signal integrity analysis using Siemens HyperLynx SI and require an IBIS model ( .ibs ) for this component. We checked the available simulation resources on the TI website and found ADS/PSpice models, but could not locate an IBIS model. Could you please confirm: Whether an official IBIS model is available for LMH6881SQ/NOPB? If available, could you please share the IBIS model file? If an IBIS model is not available, can TI provide an equivalent signal-integrity model, such as an S-parameter model or another suitable model for HyperLynx? Your support would be greatly appreciated.LMH6518DESIGN-CALChttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695552/opa855-opa855-tia-pcb-layout-review-and-provide-recommendationsThu, 05 Nov 2026 07:48:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d134496b-f399-47a1-a5bf-3f1d36309d8cArun PPart Number: OPA855 Hi TI Team, We are working on a Transimpedance Amplifier (TIA) circuit using the OPA855 (OPA855IDSGT) for our photodiode application. We have completed the initial PCB layout based on the schematic and would appreciate your technical review and recommendations to ensure optimal high-speed performance and circuit stability(Oprating at 6GHz max). Please find attached the schematic and PCB layout screenshots for your reference. Schematic;- Top layer 1:- Layer 2;- GND Layer 3:-GND Layer 4:- Power Stackup:- We would appreciate your feedback on the following points: Photodiode Input Routing Feedback Network Grounding Power Supply Decoupling Output Routing Component Placement Additionally, please let us know if any modifications are recommended to improve bandwidth, stability, noise performance, and overall signal integrity. Your feedback and recommended PCB layout guidelines would be highly appreciated before we proceed with the next PCB revision. Best regards, ArunOPA855Test & Measurementhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1692950/amc0381d-layout-recommendation/6531202Thu, 05 Nov 2026 07:16:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d0e14ab9-a61d-4b9b-9f84-a1d7a536f9ffKazuki ItohHi Jiri, It is stated that a guard ring is necessary to protect the SNSP pin, but could you explain specifically why? Why is a guard ring required when there is already more than 8mm of clearance between HVIN and the LV pin? Does leakage current cause errors in measurement results, or is it intended to address more critical risks? Best regards, Kazuki Itohhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1694227/opa2210-phase-reversal/6531139Thu, 05 Nov 2026 06:12:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2ab06ad1-9666-4b89-a69c-034b9ae5619dThomas LarsenHi Thomas Thanks for the in-depth analysis of the OPA2210. I'm happy that the phase reversal has to do with the model and not with the actual behavior of OPA2210. I saw the phase reversal in another circuit, so I made this super simple demonstration circuit. We dont have resistor in the feedback in unity gain, I just saw that it exacerbated the phenomenon. I have not tried TINA simulation, I must do that one day. Again, thanks a lot for the detailed explanation. BR Thomashttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695516/lmp8640-q1-requesting-the-supporting-data-packet-sdp-for-pcn-20261102001-2Thu, 05 Nov 2026 06:08:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c1e892a9-e676-405b-bbff-fe674f8bf0d6Shrawani BirePart Number: LMP8640-Q1 Dear TI Team, I would like to ask you SDP to undersdtand PCN in depth. Can you please share 20261102001.2 details of SDP? Thanks & Regards, ShrawaniLMP8640-Q1https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695498/tlv274-regarding-power-sequenceThu, 05 Nov 2026 05:13:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:b797b15f-650e-4678-8fcb-93affb8d20b7Daisuke HigaPart Number: TLV274 Other Parts Discussed in Thread: LMR50410 , LM27761 Hi support team all. We are considering using both power supplies. (±5 V) The positive power supply is LMR50410 and the negative power supply is LM27761. Currently, the V+ rail rises first. Is this a problem? If so, what is the reason? No diode is inserted in the connection line to the power supply pin (Vdd, GND) of the op amp. Best regards, DHLM27761LMR50410TLV274Test & Measurementhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1694766/lm1875-lm1875t-lf02-internal-die-delamination/6531064Thu, 05 Nov 2026 04:32:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:0ad08bc7-0c2d-4da9-b691-6c64f00441c5Renee ChangShould device delamination theoretically not occur? If such delamination occurs, is it considered a defective product? What methods can be used to detect the risks that delaminated devices pose during use?https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695141/tl071-differences-between-tl071idr-dc2320-5-mexico-and-dc2330-5-malaysia/6530976Thu, 05 Nov 2026 02:28:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:261605b8-8d45-4867-8374-b48271294e7ehoduck JunHI, We have verified the PCN for the part marked DC2320+5 (MEXICO, TI35M) as shown in the image below; could you please provide a response regarding the PCN for the part marked DC2330+5 (MALAYSIA, TI37K)?https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695467/opa818-heat-generation-and-oscillation-issuesThu, 05 Nov 2026 02:27:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:fba20875-0523-4e93-a9f2-223003b65ad5Shigenori MizuharaPart Number: OPA818 Other Parts Discussed in Thread: OPA695 We designed and manufactured a 32-channel circuit board in which an OPA818 is used as a transimpedance amplifier, followed by an OPA695 configured as an inverting amplifier. An S8550-02 photodiode is connected to the input of the OPA818. A 5 V bias is applied to the photodiode, and its cathode is connected to the OPA818 input. Both the OPA818 and OPA695 are powered from ±5 V supplies. The maximum expected photodiode current from the S8550-02 is 200 µA. The OPA695 stage is configured for an inverting gain of approximately 30. When the board is powered on, both the OPA818 and OPA695 heat up to nearly 90°C. In addition, oscillation has been observed in some of the OPA695 channels. To reduce parasitic capacitance, copper has been removed from all PCB layers directly beneath the routing from the S8550-02 output to the OPA818 input, as well as beneath the feedback resistor and its associated traces. What could be causing the excessive heating and oscillation?OPA818OPA695Test & Measurementhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1694483/ths3217-rfsoc-dac-achieving-1-mv-dc-offset-at-rf-output-when-no-signal-is-generated/6530973Thu, 05 Nov 2026 02:25:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:dedb9fa7-2a44-4efd-8e23-17d819e7063aKeyur TejaniListon, I responded to your query on TRF1108, and am just catching up on this thread that Ignacio (thanks!) just looped us in. This could resolve quickly or become an involved discussion. If easier and open to discussion over a call, let me know, and we can schedule a call to efficiently understand the requirements and potential options to evaluate. Keyurhttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695466/tas2573evm-doc-cert-need-tas2573-ppc3_platform_wininstaller-exe-to-adjust-the-dataThu, 05 Nov 2026 02:22:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9f24c77a-8b9b-4484-9d56-37ce0a92504czhou zhanshiPart Number: TAS2573EVM-DOC-CERT Other Parts Discussed in Thread: TAS2573 our Redtail project use the TAS2573 amplifier,now need the ppc3_platform_winInstaller.exe to adjust the data.TAS2573TAS2573EVM-DOC-CERThttps://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1695424/tas6684-q1-emi-emc-comparison-6684-vs-6584/6530969Thu, 05 Nov 2026 02:20:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:280d40c9-a785-4c2e-b14a-934b3943f00dLevi RakesShadow He, I’m trying to pass CISPR32, do you mean include the labs H/V scan data here? Would there be any other information that would help? Thank you!