Datasheet

NXP Semiconductors

Quick start ADC1415S, ADC1215S, ADC1115S, ADC1015S series (F1

or F2 versions)

Quick start

Quick start Rev. 5 — January 2011 20 of 28

3.3.5 Acquisition page

This page will acquire data to evaluate the high dynamic performance of the device:

Fig 13. SW_ADC_1_r02: “Acquisition” page

Before proceeding to any acquisition, the user needs to do the following entries:

• the sampling frequency Fs: 122.88 Msps in our example (field );

• the input frequency Fin: 5 MHz in our example (field );

• the number of samples to be acquired 65536 in our example (field );

• indicate whether it is CMOS or LVDS DDR (field );

• Press the “INITIALIZATION” button. It will initialized the HSDC-EXTMOD board:

− FPGA is ready (red LED is flashing ¼ on and ¾ off) ;

− PLL embedded is locked (green LED is on);

• indicate whether Fin or Fs are coherent or not (field ):

− if signals are coherent, selected which Fin or Fs are fixed for the calculation (see appendix

A.1);

− If signals are not coherent, select the window for FFT processing to apply (the Blackman

window gives better results).

• Press the “ACQUIRE” button  to display the results from the FFT processing. The results

fields  will be updated automatically.

• press “STOP”  button to stop acquisition;

• field  allows to do FFT averaging over up to 255 trials, suitable for small signal analysis;

• Field  allows storing dynamic results to text file. Click on the check box, enter a header as a

comment and browse to indicate where to store data file. Table 7 shows how data are stored:

















