sinara-hw/datasheets
7
1
Fork 3
Code Issues 9 Pull Requests 6 Projects Releases Wiki Activity

2118-2128: revise noise/jitter note

Browse Source
This commit is contained in:
architeuthis 2025-01-29 14:53:26 +01:00
parent ca0d2bc33b
commit 4632c72a9b
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
2118-2128.tex
View File

@ -36,7 +36,7 @@
Each channel supports 50\textOmega~terminations, individually controllable using DIP switches. Outputs tolerate short circuits indefinitely. Both cards are capable of a minimum pulse width of 3ns.
Note that isolated TTL cards are less suited to low-noise applications as the isolator itself injects noise between primary and secondary sides. Cable shields may also radiate EMI from the isolated grounds. For low-noise applications, use non-isolated cards such as 2238 MCX-TTL or 2245 LVDS-TTL.
Isolated TTL cards are not well suited to low-noise or low-jitter applications due to interference from isolation components. For low-noise applications, use non-isolated cards such as 2238 MCX-TTL or 2245 LVDS-TTL.
% Switch to next column
\vfill\break
@ -359,6 +359,8 @@
\end{threeparttable}
\end{table}
Low-jitter applications should note carefully the jitter introduced by the signal isolator. Noise is also introduced between the primary and secondary domains by the DC/DC convertor. Where noise or jtter are crucial, it is instead recommended to use non-isolated cards such as 2238 MCX-TTL or 2245 LVDS-TTL.
Minimum pulse width was measured by generating pulses of progressively longer duration through a DDS generator and using them as input for a BNC-TTL card. The input BNC-TTL card was connected to another BNC-TTL card as output. The output signal is measured and shown in Figure \ref{fig:pulsewidth}.
\begin{figure}[ht]