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The ADS4149 datasheet describes the HI PERD MODE 2 bit as:
Bit[0] HI PERF MODE 2: High performance mode 2
This bit is recommended for high input signal frequencies greater than 230MHz.
0 = Default performance after reset
1 = For best performance with high-frequency input signals, set the HIGH PERF MODE 2 bit
What is the exact difference between the default and best performance regarding the high frequency input signals?
It’s not even 100% clear if the “input signal frequencies greater than 230MHz” refers to analog bandwidth or sample rate.
Jim,
Thank you for your answer. And do you have the dB values of the SFDR performance?
Irmak,
The ADS4149 was tested in in default mode (baseline) and with all combinations of high performance mode options (HPM1, HMP2, HMP1&2).
In summary, the SFDR demonstrated an improvement of 1-2 dBFS over the baseline when configured with the HPM1&2 option for frequencies above 150MHz. The SNR also demonstrated ~1 dBFS of improvement with this option.
See attached data.
Regards,
Jim