ADS54J60EVM: Reducing the interleaving spurs

Ladislav Kalina

Part Number: ADS54J60EVM
Other Parts Discussed in Thread: ADS54J60

Tool/software:

Hi,

I want to reduce the interleaving spur at fs/4. I have an eval board of ADS54J60 and TSW14J50EWM. I tried to follow the application note (Implementing the External DC Offset Correction Block in the ADS54J60), but I am stuck in chapter 5.3 bullet 1. DC Calibration Bandwith. The configuration file "DC_IL_Freeze1.cfg" is missing.

There is no problem creating the mentioned file (files), but we are confused about the right register address. In the datasheet are mentioned 6100h and 0000h addresses. Which one is the right? Also, we tried both of them, but nothing worked properly.

Can you send us these files or send us the right procedure?

Thanks

over 1 year ago

0 Rob Reeder over 1 year ago

TI__Mastermind 38890 points

Hi Ladislav,

I am checking into this for you.

Regards,

Rob

0 Ladislav Kalina over 1 year ago in reply to Rob Reeder

Prodigy 10 points

Hi Rob,

any update?

Regards,

0 Rob Reeder over 1 year ago in reply to Ladislav Kalina

TI__Mastermind 38890 points

Hi LK,

Sorry for the delay. I am still trying to locate the files.

The person that wrote the article no longer works in our group.

Regards,

Rob

0 Rob Reeder over 1 year ago in reply to Rob Reeder

TI__Mastermind 38890 points

Hi LK,

See attached files. Sorry for the delay.

Regards,

Rob

Config_Files.zip

0 Ladislav Kalina over 1 year ago in reply to Rob Reeder

Prodigy 10 points

Hi Rob,

I followed the application note about interleaving spurs for ADS54J60.

I used the files, read the "Frozen DC Offset Values", load the "DC Offset Values" (pre-load_write.cfg) and the result was much worse than the beginning. I am sending you screenshots from the HSDC.

What am I doing wrong? I am trying to eliminate the spur as much as possible, but the result is much worse.

Am I able to eliminate the interleaving spurs on fs/2, and fs/4? Without eliminating the interleaving spurs on ADS54J60 shortly, we will have to choose another ADC.

Regards

0 Rob Reeder over 1 year ago in reply to Ladislav Kalina

TI__Mastermind 38890 points

Hi LK,

No you won't be able to eliminate the IL spurs completely, this is product of interleaving architectures unfortunately.

If you let me know you application requirements, I can help you down select another ADC.

Regards,

Rob

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ADS54J60EVM: Reducing the interleaving spurs