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-DSO338-NANO-PRO-30-MHz-200MSa-s-Mini-Pocket-Sized-Port-til-Handheld-IPS-LCD/32914522051.html"
"https://pt.aliexpress.com/item/O120-DSO338-NANO-PRO-30-mhz-200MSa-s-Mini-Pocket-Sized-Port-til-Handheld-IPS-LCD/32950052977.html"
"https://www.ebay.com/itm/O120-DSO338-NANO-PRO-30MHz-200MSa-s-Mini-Portable-IPS-LCD-Digital-Oscilloscope-/302852716371?_ul=EN"
"https://www.ebay.com/itm/DSO338-Handheld-Oscilloscope-30MHz-Bandwidth-200M-Sampling-Rate-2-4-Inch-IPS-/173774951976?_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):