Other Parts Discussed in Thread: LMX2582, USB2ANY, SYSCONFIG
Tool/software:
I am currently working with the LMX2582EVM to generate an output frequency of 2.45 GHz using TICS Pro software. I am following the steps outlined in the LMX2582 User Guide. However, I am unable to observe any RF output, and I would appreciate your guidance on the matter.
Setup with LMX2582EVM (TICS Pro):
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Default configuration was loaded from the configuration bar in TICS Pro, and registers were written using Load Registers.
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RFoutAP is connected to a DSO, and RFoutAM is terminated with 50 Ω.
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Verified that the 100 MHz oscillator output is reaching the PLL input pin.
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SPI lines were probed with a logic analyzer and confirmed data transfer. The SPI clock observed is 125 kHz. Attached the image for your reference.
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Is this clock frequency sufficient for proper LMX2582 operation?
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I did not find any option in TICS Pro to change the SPI clock frequency.
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Despite this, no output is observed on the RFout pins.
Setup with F2800157 MCU (Custom Board):
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Registers were exported from TICS Pro and written in descending order (R64 → R0).
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A soft reset was issued beforehand by writing
0x00221Eto R0. -
100 MHz oscillator input has been verified.
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SPI has been tested with clock rates of 1 MHz and 10 MHz, using Mode 0 (CPOL=0, CPHA=0).
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No RF output is observed.
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MUXOUT was configured with
MUXOUT_SEL=0for readback, but no signal is present on the MUXOUT pin either.
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Are there any additional initial configurations required apart from the exported register writes?
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What is the recommended way to confirm that the SPI writes are being correctly applied to the LMX2582?
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Could the absence of MUXOUT activity indicate an SPI communication issue or a separate configuration step that I am missing?
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For TICS Pro: is the default 125 kHz SPI clock sufficient, or is there a way to adjust it?
Any guidance to help resolve this would be greatly appreciated.
Best regards,
Muhammed Rizwan
