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| resources:eval:user-guides:ad-fmcomms5-ebz:hardware:configuration_options [09 Jul 2019 01:49] – add note about driver Travis Collins | resources:eval:user-guides:ad-fmcomms5-ebz:hardware:configuration_options [09 Jul 2019 01:51] (current) – [Rev C] Travis Collins |
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| ==== Rev C ==== | ==== Rev C ==== |
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| The FMComms5 comes with the [[adi>ADF5355]]. This on board reference normally flows through C331, and C332 (and C390 and R350 are DNI). To use the on-board ADF5355, just pick the right device tree on the SD Card. With the necessary device tree, the ADF5355 can be controlled like any IIO device to change the LO frequency of both transceivers. | The FMComms5 comes with the [[adi>ADF5355]]. This onboard reference normally flows through C331, and C332 (and C390 and R350 are DNI). To use the onboard ADF5355, just pick the right device tree on the SD Card. With the necessary device tree, the [[resources/tools-software/linux-drivers/iio-pll/adf5355|ADF5355]] can be controlled like any IIO device to change the LO frequency of both transceivers. |
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| To bypass the the ADF5355 and use an external LO hardware modifications are necessary. Rotate C332 by 90 degrees, so it goes on the pad of the C390 and remove C331 placing R350. In this configuration an external reference clock can be injected into J302. The level of the external reference should be ensured to not exceed the [[adi>HMC744LC3]] input conditions, and it will still be used to distribute the reference clock to the two AD9361s. | To bypass the ADF5355 and use an external LO, hardware modifications are necessary. Rotate C332 by 90 degrees, so it goes on the pad of the C390 and remove C331 placing R350. In this configuration, an external reference clock can be injected into J302. The level of the external reference should be ensured to not exceed the [[adi>HMC744LC3]] input conditions, and it will still be used to distribute the reference clock to the two AD9361s. |
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| <WRAP important>The hardware modifications (moving the cap, removing the cap, adding the resistor, is difficult since the components are tiny (0402 packages or 1 x 0.5 mm) and should be done by skill professionals only</WRAP> | <WRAP important>The hardware modifications (moving the cap, removing the cap, adding the resistor, is difficult since the components are tiny (0402 packages or 1 x 0.5 mm) and should be done by skilled professionals only</WRAP> |
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| {{ :resources:eval:user-guides:ad-fmcomms5-ebz:hardware:img_0246.jpg?500 |}} | {{ :resources:eval:user-guides:ad-fmcomms5-ebz:hardware:img_0246.jpg?500 |}} |
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