FIFO for ADC (200MSPS from a 40MSPS ADC???)

[rtek]

Hello,

I saw some oscilloscope models with the ADC TLC5510.

This adds up to 20MSPS and, with the help of a FIFO (AL422B suggested on the STM website), it may be easier to use the entire ADC bandwidth.

But, I would like to know how to get 200MSPS from a 40MSPS ADC. Look at this analysis of this DSO338:
"3dB bandwidth is around 15MHz" "this application an external one is used (AD9288BSTZ-40 dual 8 bit 40MSPS ADC)"
https://lygte-info.dk/review/Equipment% ... %20UK.html

200MSPS??? How???
"https://pt.aliexpress.com/item/O120-DSO ... 22051.html"
"https://pt.aliexpress.com/item/O120-DSO ... 52977.html"
"https://www.ebay.com/itm/O120-DSO338-NA ... 371?_ul=EN"
"https://www.ebay.com/itm/DSO338-Handhel ... 976?_ul=EN"

[rtek]

Hi,

if anyone wants to buy the 30MHz DSO338 AARONTEK FNISRI, search well,

Notice that there is approximately 50% difference from the DSO150 (Vrms):