5968-4632E Datasheet, PDF (67/77 Pages) Keysight Technologies – Probing Solutions for Logic Analyzers

67 | Keysight | Probing Solutions for Logic Analyzers - Data Sheet
Probing Solutions for 40-pin Logic Analyzers
Mictor and Samtec Probing (Continued)
Options for on-board
terminations for the E5351A
There are two options for isolating the
E5351A on the target PC board:
– Use the surface mount isolation
network, Keysight part number
5062-7396. Refer to Figure 9.32 for
schematic and pinout.
– Use discrete components. Refer
to Figure 9.31 for recommended
components and equivalent load.
If you are operating at state speeds
above 200 MHz, you should use discrete
components for best results. Due to the
added electrical length of the E5351A
probe cable, the divider compensating
capacitors in the SIP, and surface-mount
isolation networks are not optimum for
the E5351A, but they are usable up to
200 MHz clock rates.
Suggested on the board RC network
k
10 pF
Equivalent load
9 pF
Figure 9.31. Suggested on-board isolation network and equivalent load when using discrete
components to terminate the E5351A.
1. The effective input capacitance for on-board isolation networks is purely a function of geometry -
0.3 pF is about as low as can be achieved.
2. The equivalent load is the same when using the surface-mount isolation network, 5062-7396.