TSW14J58EVM: TSW14J58EVM

Xifeng,

We are looking into your issue and will get back with you in 1-2 business days.

Regards,

Geoff

Thanks.

Hi Chase,

I can not load the device ini corectly.  Actually only very limited  ini options under the ADC drop down. For example, when I use RF5200 ADC, I use _JMODE1, and I can not find JMODE1 under the drop down. Tried _JMODE30 a few times, the HSDC Pro just crashed.

Hi Xifeng,

I will hand this off to ADC12DJ5200RF engineer. Kindly await their response.

Regards, Chase

Thanks.

This is the error I got when tried to load ini file. There are only 4 ini choices for RF5200 (JMODE0,JMODE10,JMODE21 AND JMODE30). Used to be a lot for TSW57 board. Thanks

Hi Xifeng,

I just wanted to add that this ADC EVM was released when the TSW14J57EVM was the main device for data capture, and this is why there is not as many options showing in the ini choices. The TSW14J58 came after and as a result, I am guessing only a few of the popular modes were created for this firmware. TI should be able to create new ini for your specific JMODE as well as update the firmware dll in the ini file for you. Which particular JMODE are you interested in evaluating? This will help expedite a solution for you as the engineer will require this information. 

Regards, Chase

Currently I need both JMODE single channel (interleaving) and dual channel for RF5200 ADC. I also need these JODE for RF4000 ADC too. In the long term, I will need  more JMODE. I understand the situation, and I expect TSW14J58 will be fully compatible or exchangeable with TSW14J57 soon.

Thanks.

Hi Xifeng,

Which specific JMODEs would you like to use? If you look at table 7-23 in the ADC's user guide it will give you a complete list of all the JMODEs for the device, and each one has a different set of features. In the meantime I am trying to reproduce the problems you are seeing with J58.

Best,

Eric Kleckner

Hi Eric,

I user guide I have does not have table 7-23. Can you share the user guide? So we can look at the same one.

Currently I need both JMODE single channel (interleaving) and dual channel for RF5200 ADC. I also need these JMODE for RF4000 ADC too. In the long term, I will need  more JMODEs. I understand the situation, and I expect TSW14J58 will be fully compatible or exchangeable with TSW14J57 soon.

Thanks

Xifeng, please find table here in datasheet.

https://www.ti.com/lit/ds/symlink/adc12dj5200rf.pdf#page=95

Regards, Chase

Hi Eric and Chase,

After I look through the table, I would like to use JMODE1 and 3 (probably 0 and 2 too) for both ADC12DJ5200RF and ADC12DJ4000RF modules. 

Thanks,

Xifeng

Ok great, I will work on debugging the problems you were seeing and trying to test these JMODEs out and get back to you by Friday.

Best,

Eric

Hi Eric,

I have a JMODE related question for you.  In the guide of 7.4.3 (page labels as 92), which states
"7.4.3 Dual-Input Single-Channel Mode (DUAL DES Mode)
The ADC12DJ5200RF can also be used as a single-channel ADC where the sampling rate is equal to two
times the clock frequency (fS = 2 × fCLK) provided at the CLK+ and CLK– pins. This mode interleaves the two
channels by sampling them out-of-phase and each channel samples separate analog inputs (INA± and INB±).
The effective sampling rate is twice the device clock input (CLK±). This mode is useful for sampling the output of
interleaved track-and-hold analog front-ends. This mode is chosen by setting JMODE to a single channel mode
as described in Operating Modes and setting SINGLE_INPUT to use both INA± and INB± (see the input mux
control register). The digital processing and JESD204C interface operate as if the device is in single-channel
mode sampling only one of the inputs."

Which JMODE is that?

I believe the two channels are being sampled sequentially, rather than simultaneously. In other words, it will sample channel A first with rate 2Xfclk, then sample channel B.    Do I understand correctly?

Thanks,

Xifeng

Hi Eric,

Thank you for your detailed explanation. According to your answer, there will be a time shift between time axis of channel a and b. That time shift should be smaller than 1/fs. Hopefully this time I get it correctly (^_^).

Xifeng

Hi Xifeng,

Are you trying to sample two different analog signals or one analog signal being split across both inputs?

Hi Eric,

There are a few situations. 

1). We only need to measure one signal, so we only need single channel mode up to 5.2 GS/s ( or 10.4 GS/s with interleaving)

 2). We have two signals A (in-phase) and B (quadrature), so we need dual channel mode (sampling simultaneously) 

I do not think we need dual des mode for now, but it could be useful if we can measure two signals (both sampling with highest 2xFclk). When we do not care the phase (or correlation) between channel A and B, this mode could be a very effective way.

Thanks,

Xifeng

Hi Xifeng,

I think that if you want to sample two separate signals at 10.4 GHz you will need two separate ADCs running in single channel mode. The dual des mode is for sampling the same signal you are just spreading it across both inputs rather than single channel mode where you input the analog signal to only one input and the ADCs internally routes the signal to both ADCs.

Best,

Eric