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Hi,
Yes, I use this function in the ADC32RF45. The EVM SPI GUI has controls for setting the bits for 12bit ramp in bypass mode, and then doing a capture with the TSW14J56 I see the ramp pattern on the captured data.
Regards,
Richard P.
Hi,
the subject line says ADC32RF45, but I see in the text that you are looking at ADC32RF42.
There is not LMFS=4221 in bypass mode. There is LMFS=4222. I have used that mode on my lab PC. The data will be 14bit when using LMFS=4222. The data will be 12 bit when using LMFS=42810.
Regards,
Richard P.
Hi,
We are using the ADC32RF42 in LMFS = 4211 (my error in previous reply), 14-bit output resolution, bypass mode. In order to use the ramp test pattern, does the ADC32RF42 need to be in 12 -bit mode?
Hi,
There still is some error there somewhere. In bypass mode there is no LMFS=4211. The LMFS_4211 mode is one of the DDC modes for single band real. The 14bit bypass mode is LMFS_4222.
The bit in the JESD digital page for RAMP 12BIT certainly works for the 12bit bypass mode. For the DDC modes there is a different place to set the ramp pattern and that is the TEST PATTERN SEL in the decimation filter page. It is possible that this would also be the place to set the ramp pattern when using the bypass 14bit mode as well.
Regards,
Richard P.
it has been a while, but I wanted to check before closing. have you been able to see the 12bit ramp while in bypass mode? I just checked again, and on the bench I do see the 12 bit ramp pattern while in 12bit bypass mode. Then, since you were really looking for 14bit bypass mode I set it for that mode and set the 12bit ramp enable bits, and again I still see the 12 bit ramp. I see the 12bit ramp on the 12 most significant bits of the 14 bit sample, though, in addition to the two zeros that are appended to the 14 bit sample to fill out the JESD frame.
Regards,
Richard P.