Tool/software:
Hello,
I use 8 DS100KR800 on a design. I use them in master mode sharing a same EEPROM, and with 3v3 mode.
The signals integrity is reduced by the repeaters. I have the same behaviour for each channel.
The registers impact the redrived signals.
I have keep only one channel active for make measurements.
Best results are obtained by having an equalization to 0 and de-emphasis to 0.
Input signal:
Output signal with equalization to 0 and de-emphasis to 0.
Increasing equalization or de-emphasis reduce signal integrity.
Output signal with equalization to 0 and de-emphasis to -1.5 dB.
Output signal with equalization to 1 and de-emphasis to 0
I tested all suggested equalization values up to FR4 20 inch 4-mil trace.
I have measured supply noise up to 50MHz, I have less than 10mvpp on bandwidth.
Do you have any suggestion to improve eyes opening.
Thanks,
Robin