Hello!
I bought FA-2 Frequency counter (26.5Ghz version) and it worked fine up to 24GHz
After a few months it stopped working (the reason is not clear to me, maybe ESD), but the input RF power was definitely not exceeded.
I bought another one of the same device (again Eur 420)
a few months later the situation repeated itself with new device
after a short investigation I found out that the input prescaler is damaged
I set jumper between prescaler input and output. Freq on display is multiplied by 8 of actual frequency.
what i know about this IC
Max freq - 26.5Ghz Min 200 Mhz (maybe lower, but not tested)
Power supply voltage - +3.3V
Diff Input and Diff output
All other pins and pad connected to GNG
Please help recognize the prescaler chip. Marking code S004 SSZD6
or suggest alternatives (I haven't found a suitable alternative in stores. Or a different supply voltage or a different frequency range or a different pinout)
Thanks!