ADS54J42: using Beagle bone black to SPI bus

Thisara Walpita

Part Number: ADS54J42

Hi,

I'm working on ADS 54J42. I need to make single lane (A0 and B0) A to D convert. I'm going to keep the setting of ADS 54J42 by using Beagle Bone Black SPI bus. Can you please provide me registers address and bit configuration for the setup the AD convert?

I'm using Matlab with beagle bone black for the SPI configuration

over 6 years ago

0 jim s over 6 years ago

TI__Guru* 91947 points

Thisara,

The information is attached. in this mode, only data lane output DA1 is valid.

Regards,

Jim

LMFS 1241 SPI writes.docx

0 Thisara Walpita over 6 years ago

Prodigy 85 points

Thank you very much.

I need to use both A/D channeles (DA0 and DB0) . The physically connected lanes are DB0P and DA0P. Can you please help me to configure that ?

0 jim s over 6 years ago in reply to Thisara Walpita

TI__Guru* 91947 points

Please provide the LMFS setting you are targeting.

0 Thisara Walpita over 6 years ago in reply to jim s

Prodigy 85 points

LMFS =4222

Can you please let me know the SYSREF frequency CLKINP frequency required . ?

Thank you !

0 jim s over 6 years ago in reply to Thisara Walpita

TI__Guru* 91947 points

4861.JESD204B Overview July_2018.pptx ADS54J40_2x_dec_lowpass_4222.cfgYou can use whatever sample frequency you want as long as it is in range of the data sheet. If you pick the max, and with no decimation, SYSREF is the sample rate divided by the K value. Attached is the configuration file used by the ADC GUI for the 4222 mode. You can get the register settings from here. I have also attached an JESD204B overview document, which might help you as well. Our support bandwidth is limited so I may not be able to provide answers to every question you have. Please the JESD204B folders on the TI website for more information and the ADS54J42EVM User's Guide.

Regards,

Jim