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NI SCB-68 HSDIO Connection Guide & Specifications
Adding SMB Connectors (Optional)
If your application requires better signal integrity for high-speed signals, you can populate one
or more of the SubMiniature version B (SMB) pads with connectors. Figure 2 shows the
locations of the SMB pads.
Use SMB connectors with 50
Ω
impedance to match the trace impedance of the NI SCB-68
HSDIO. Table 1 lists the recommended SMB connectors.
Special Considerations for HSDIO Connections
National Instruments recommends using 50
Ω
cables for all signal connections. If you do not use
50
Ω
cables, your application may be affected by signal reflections. You can limit the amplitude
of signal reflections by terminating output lines with Schottky diodes, as shown in Figure 5.
Figure 5.
terminating Output Lines with Schottky Diodes
One suitable Schottky diode is the 1N5711, available from several manufacturers.
Note
Refer to the help file for your RIO device for information about the number
and functions of available DIO channels on the device. DIO <20..31> and PFI_0 may
not be applicable to your device. DDC CLK OUT/PFI_4 and STROBE/PFI_5 may
function differently on different devices.
Note
The NI 6533 and NI 6534 are not compatible with the NI SCB-68 HSDIO.
Table 1.
Recommended SMB Connectors
Manufacturer
Part Number
Amphenol
903-415J-51P
Applied Engineering Products (AEP)
2009-1511-0050
VCC
RIO Device
Extern
a
l Device
