TSW14J56EVM: HSDC raw binary matlab plotting

Kyle Nathan

Part Number: TSW14J56EVM

I am using the TSW14J56EVM to record data from an ADC12J4000EVM board. When I save the data as a raw binary file I am unable to plot it correctly in MATLAB. I saw another post where someone used the code below, but they had a similar scaling issue that I have. I captured a -20dBm CW signal and see it correctly in HSDC pro, but when I save the data out I do not get the same values. The time domain signal has a mV range between +/- .035mV and the HSDC pro is showing +/-.1mV. Is there something wrong with the code below? Do I need to parse out each channel or only look at channel 1?

Thanks for your time,

Kyle

fileID = fopen('redo_200cycles_-20dBm.bin');
A = fread(fileID,Inf,'int16');
fclose(fileID);
Bits=12;
A = A - 2^(Bits-1);
Vfs=725e-3/2;

fs = 4000e6;
T=1/fs;
L = length(X);
t = (0:L-1)*T;
figure;plot(t*1000,X)
title('Time-domain Signal')
xlabel('Time (ms)')
ylabel('X(t)')X = Vfs*A/2^(Bits-1);

over 3 years ago

0 Chase W over 3 years ago

TI__Mastermind 20335 points

Hi Kyle,

Can you upload the data file for us to look at?

Thanks

0 Kyle Nathan over 3 years ago in reply to Chase W

Prodigy 30 points

Chase,

Is there an email I can send it to you? I am unable to upload files into the forum. I'm not sure why.

Thanks,

Kyle

0 Chase W over 3 years ago in reply to Kyle Nathan

TI__Mastermind 20335 points

Kyle,

Please send me an email containing the data to this address.

+1 Chase W over 3 years ago in reply to Chase W

TI__Mastermind 20335 points

Kyle,

Please see the corrected code and result below. This code should work for any single channel HSDC Pro binary file as long as the sample rate is adjusted correctly. The variable window_len will adjust the number of samples plotted.

Regards, Chase

%%
file_name = 'redo_200cycles_-20dBm.bin';
fileID = fopen(file_name);
X = fread(fileID,'int16');
fclose(fileID);
Bits=12;
X = X - 2^(Bits-1);
X = X / 2^(Bits -1);

%% -  USER ADJUSTMENT


fs = 4000e6;
window_len = 4096;


%% - plotting

T=1/fs;
L = length(X);
t = (0:L-1)*T;

figure;
plot(t(1:window_len),X(1:window_len));
xlim([0 t(window_len)]);
title('Time-domain Signal');
xlabel('Time (ms)');
ylabel('Volts');

Data converters

Data converters forum

TSW14J56EVM: HSDC raw binary matlab plotting