https://e2e.ti.com/support/rf-microwave-group/rf-microwave/Products covered in this section are Digital Radio (Gray Chip) Products. en-USTelligent Community 13https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6482226Mon, 14 Sep 2026 12:58:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:71705a54-4fa8-4fe2-baae-127bfda647c7Erfan OmidvarUPDATE in Far-field test: Root cause identified: the electrically floating metal thermal/mechanical layer above the PCB was strongly coupling to RF energy generated by the Ethernet/PHY circuitry and acted as an unintended resonant/radiating structure. Removing the metal layer eliminated the excessive emissions. Electrically bonding the metal layer to PCB ground also eliminated the failure, confirming that its floating RF potential/coupling was a major contributor to the EMC issue.https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1680967/lm706a0-lm706a0-ibb-drop-with-different-loading/6480324Fri, 11 Sep 2026 02:07:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:36246f78-fb7f-4301-8397-772ffc44d2e9Pramanik PatelHi, There seems some unstability. I will try calculating poles and zeros to see there is a issue. Thankshttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1681314/afe7950evm-latest-trm-register-map-still-only-sbau337-deprecated-may-2020-in-afe79xx-hsc-designFri, 11 Sep 2026 01:14:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:af3c858c-6015-4915-a5f2-d02efd143b7bLi LeonPart Number: AFE7950EVM We requested ande downloaded AFE79XX-HSC-DESIGN. The only full register document we can find is still Deprecated_Register_Set_SBAU337_13th_May_2020. Our SPI log ( Afe79xxPg1 ) contains many field names and addresses that are not in SBAU337. So we are not sure if this deprecated document is right. Questions: Where is the current TRM/ register map for the AFE7950EVM?AFE7950EVMhttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1677181/lmzm23601-locating-stock/6479461Thu, 10 Sep 2026 13:13:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d4deddfd-524d-454c-b884-397393e233faRaz ZeevyHi Paul, Depends which version is in the radio. The 3.3V part you can get, TI.com shows 1805 of V3SILR today besides the two 5V reels above. The adjustable SILR/T is at zero everywhere I can see, restocks out in 2027. Pin-to-pin fallback per the datasheet is the LMZM23600, 258 on TI.com today, but it's 0.5A so check your load. We mapped module crosses for the SILR at Parter too parter.ai/.../lmzm23601silrhttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1680967/lm706a0-lm706a0-ibb-drop-with-different-loading/6479160Thu, 10 Sep 2026 08:50:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:28b2db03-6196-491e-88f7-14747d74c272Alvin TsaiHi Patel, We try your suggestion and add output caps(10uF*2 and 22uF*2). It seems to improve voltage drops. But the power good is abormal behavior. So we change to EXT COMP. the power good is normal. then we want to know the SW waveform is different betwewn 1A and 2A. SW pin have ring and triple on/off in 2A but SW always on/off in 1A. Internal COMP: Loading 0A 0.5A 1A 2A 3A Vout -8.24V -7.97V -8.08V -8.28V -7.53V Wavform EXT COMP: Loading 0A 0.5A 1A 2A 3A Vout -8.24V -7.94V -7.88V -7.77V -7.44V Waveformhttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1680967/lm706a0-lm706a0-ibb-drop-with-different-loading/6478827Thu, 10 Sep 2026 04:12:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a6ae736d-69d1-40c0-9eb0-8e8897c410d6Pramanik PatelHi, I see that currents are in limit. I suspect there seems some instability in buck. Can you try using internal comp by pulling EXTCOMP to VDDA using a 100kΩ resistor. By then I will try to get simulation model for this and try to simulate. Thankshttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1680967/lm706a0-lm706a0-ibb-drop-with-different-loadingThu, 10 Sep 2026 02:54:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:79bf87d2-6ea2-4898-b5df-3598c6515b6fAlvin TsaiPart Number: LM706A0 Hi TI experts: For the various of loading : 0A/0.5A/1A/2A, the out are -8.39V, -8.37V, -10.62V, -9.67V we want to know how to cause to voltage drops for 1A and 2A loading. Vin 48V Vout -8V Iout(max) 3A Fsw 800K Inductor 10uH, Idc=3A, Isat=7A The SW pin waveform (reference system GND): 0A 0.5A 1A 2A Here is our IBB N8V design:LM706A0Datacom modulehttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1680871/afe7950-problem-achieving-deterministic-latency-and-clock-definition-using-afe7950evmWed, 09 Sep 2026 15:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:579b2514-d25e-47c6-8af4-fe1c8b76fafcRafael MoraisPart Number: AFE7950 Hello, I am having trouble achieving deterministic latency using AFE7950EVM with ZCU102. I based my design on the reference designs. This was the 8b10b ref design that I updated to use a line rate of 3686.4 MSPS. I have seen in this post: AFE7950: 4T4R2F 8b10b 2.4576 Gbps SERDES JESD link not always initializing properly where it mentions the need to use an external clock directly to the IP with length matching the sysref signal and without passing through a PLL. The IP datasheet also mentions that for both rx_sys_clock and tx_sys_clock should be sourced independantly. My problem comes from the fact that tx_sys_clock is limited to "linerate/80" in the case of 64bits data width which is 46.08 MHz. rx_sys_clock says that it can be greater to or equal than linerate/80, and I dont seem to be able to get 46.08 MHz from the lmk on the AFE7950EVM. Is this possible to get or what would be the best way to achieve deterministic latency without changing linerate? I am only using one TX and one RX channel. Please guide me through this problem.AFE7950EVMAFE7950Aerospace & Defensehttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6477822Wed, 09 Sep 2026 13:24:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:ac9a0603-d491-4181-981e-cbe2957cd709Kallikuppa SreenivasaHello Erfan Omidvar, Nothing i can quickly think off. Did you as a quick check try adding a shield on the top of the EPHY IC. Regards, Sreenivasahttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6475839Tue, 08 Sep 2026 10:26:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9468a619-cc92-41c2-b5dd-1c02636dc76cErfan OmidvarHello Kallikuppa, Any more suggestion? Regards,https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6475493Tue, 08 Sep 2026 05:20:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:26ce0e5e-9209-43df-b260-23f1e634ea46Kallikuppa SreenivasaHello Erfan Omidvar, Thank you. Regards, Sreenivasahttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6475113Mon, 07 Sep 2026 15:17:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:41e53de3-62bb-4fc4-b8a5-d3911a39c1faErfan OmidvarYes tried to be closest with capshttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6475109Mon, 07 Sep 2026 15:11:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:676aa81b-4cad-4b45-85c2-8d269b36acb0Kallikuppa SreenivasaHello Erfan Omidvar, Thank you for updating the progress. [quote userid="639158" url="~/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6473441"]The KSZ9031RNX uses a separate 25 MHz crystal as its PHY reference clock.[/quote] I assume the crystal and associated components are as per the requirements and the required grounding of the crystal has been considered. FYI, below is the guidelines for one of the sitara processor family AM62L Regards, Sreenivasahttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6473793Fri, 04 Sep 2026 15:43:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d7a759a7-fd9e-4ed5-bd4d-c9486f0b310dErfan OmidvarI performed additional near-field measurements using the HZ552 H-field probe . The strongest field is observed directly over the KSZ9031 package . I also removed the RGMII series resistors, effectively disconnecting the RGMII signals from the PHY, and the harmonic energy was still clearly present over the KSZ9031 itself. When the Ethernet link is down, however, these harmonics disappear. I also compared different link speeds. At 10 Mbps , the problematic harmonics almost completely disappear. At 100 Mbps , a clear 25 MHz-spaced harmonic pattern is observed (125 MHz, 150 MHz, 625 MHz, 650 MHz, etc.). At 1 Gbps , fewer peaks are observed, mainly associated with the 125 MHz clock family , but their amplitudes are significantly higher. Based on these observations, my current assumption is that the noise is generated by the internal clocking/switching circuitry of the KSZ9031 when the link is active. This energy then couples into the RGMII signals, and the RGMII traces/return paths may act as part of the radiating structure (antenna)https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1679538/afe8128-product-information-needed/6473656Fri, 04 Sep 2026 14:26:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a07afd9f-5e2b-4c67-a889-7c5ce883b5dcKang HsiaHello, I have asked our marketing engineer to reach out to you for the request. Thank you! -Kanghttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1679538/afe8128-product-information-neededFri, 04 Sep 2026 11:00:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:0779f2b4-d00f-47ed-a251-31de0763d4f5Frederik GrotePart Number: AFE8128 Hello! We need datasheet, documents regarding integrations and infos about availability regarding AFE8128IAPK. Best regards, Dennis BorgmannAFE8128https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678449/am3352-am3352-rgmii-radiated-emi-25-mhz-125-mhz-harmonic-emissions/6473441Fri, 04 Sep 2026 09:29:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8a08d72b-0382-4076-8390-ef0235eb3b56Erfan OmidvarThank you for the suggestion. Unfortunately, changing the RGMII I/O voltage from 3.3 V to 1.8 V is not feasible on our current hardware. The AM3352 RGMII I/O supply is shared with other I/Os, and the corresponding power pins/traces are not accessible for modification on the assembled PCB. Therefore, we cannot change the processor RGMII domain to 1.8 V independently. The AM3352 uses a 24 MHz crystal connected directly to XTALIN/XTALOUT as its processor clock reference. The KSZ9031RNX uses a separate 25 MHz crystal as its PHY reference clock. The MAC-to-PHY interface is RGMII. At 100 Mbps we observe harmonics associated with the 25 MHz RGMII clock, while at 1 Gbps the dominant emissions are associated with the 125 MHz RGMII clock and its harmonics. For the near-field investigation, I used an HZ552 H-field probe . Significant emissions are detected directly over the RGMII signal traces, on both TX and RX sides, The emissions appear to comes from the surface/area of the KSZ9031 PHY itself as well The behavior is strongly dependent on Ethernet speed. At 100 Mbps , we observe the 25 MHz harmonic family, while at 1 Gbps , the dominant emissions are related to 125 MHz and its harmonics. Regarding the loopback test, we have not tried PHY loopback yet. We are currently investigating how to configure the KSZ9031 in a suitable loopback mode so that we can isolate the PHY activity from the RGMII interface and repeat the near-field measurements. Any other suggestion?https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678790/afe7769-afe7769-independent-per-channel-nco-control-macro-0x29-groups-channels-in-pairs-runtime-re-calibration-after-bring-up/6473110Fri, 04 Sep 2026 03:12:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2b0324d1-f237-4199-85aa-7654b5898114Serkan TokgozHi Petro, AFE7769 NCO control is grouped by channel pairs, not per-channel independent. For your use case (independent per-channel NCO at runtime), I'd recommend evaluating the AFE7769D instead: AFE7769D supports per-channel independent NCO control via the Low-IF calibration — each TX/RX chain can be retuned independently Same quad-channel architecture, pin to pin compatible with AFE7769, JESD204C, 5G base-station form factor Regards, Serkanhttps://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678790/afe7769-afe7769-independent-per-channel-nco-control-macro-0x29-groups-channels-in-pairs-runtime-re-calibration-after-bring-up/6471878Thu, 03 Sep 2026 07:19:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:140add57-2e27-46ed-8e40-595828cba147Petro KhlyshchyborshchHi, Thanks, that's the AFE7769. However, this function also controls the NCO in pairs (AB/CD), not per individual channel. I need to set the NCO independently for each of the 4 channels separately.https://e2e.ti.com/support/rf-microwave-group/rf-microwave/f/rf-microwave-forum/1678790/afe7769-afe7769-independent-per-channel-nco-control-macro-0x29-groups-channels-in-pairs-runtime-re-calibration-after-bring-up/6471641Thu, 03 Sep 2026 03:58:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:844d8abf-9f4a-4e4e-bc1b-1421648dba4dKang HsiaHi Petro, Is this the AFE7769 (non-DPD) or the AFE7796D version? If you have the AFE7769, you may look into the following API in the file "AFE77xxKeyCFunctions_v1p12.c". It is available on the TI Secure Server The API offers flexibility in the low IF NCO updates.