NI offers multiple options for connecting the single-ended digital pattern instruments and digital waveform instruments to your device under test (DUT). Each option is designed for controlled-impedance 50 Ω traces and matched trace lengths.
NI recommends that you use the NI SHC68-C68-D4 shielded cable for connections to your instrument. This cable is designed specifically for the custom pinout of the VHDCI connector on these devices, and it provides 50 Ω coaxial transmission lines for each signal.
Figure 1: SHC68-C68-D4 Cable
NI CB- 2162
The NI CB-2162 is a connector block and prototyping board for single-ended digital pattern instruments and digital waveform instruments. The NI CB-2162 provides an easy way to do the following tasks:
• Terminate digital I/O (DIO) and control channels
• Connect with other devices for testing and debugging
• Develop and interface to prototype circuits
• Probe DIO and control channels
Figure 2: Connecting an NI CB-2162 to a Digital Waveform Instrument
In Figure 2, the single-ended digital waveform instrument is connected to the NI CB-2162 using the older NI SHC68-C68-D2 cable. In this figure, the DUT was placed directly on the prototyping area of the CB-2162 and wired to the header pins. Additionally, the header pins can be used to cable to an external DUT interface board.
The NI SMB-2163 is a breakout box for single-ended digital pattern instruments and digital waveform instruments. The NI SMB-2163 provides an easy way to connect to other devices for testing and debugging by routing every DIO and control channel on a separate SMB coaxial connector.
Figure 3: Connecting an NI SMB-2163 to a Digital Waveform Generator/Analyzer
In Figure 3, the single-ended digital waveform instrument is connected to the NI SMB-2163 through the older SHC68-C68-D2 cable. The connection between the NI SMB-2163 and the DUT is made using coaxial SMB cables (as shown).
If a solution is not viable with any of the previous accessories, creating a custom printed circuit board (PCB) is the last option for connecting the single-ended digital pattern instrument or digital waveform instrument to the DUT. This option allows you to customize the interface to effectively meet the requirements of your DUT.
Figure 4: Connecting a Custom PCB to a Digital Waveform Instrument
In Figure 4, the single-ended digital waveform instrument is connected to the VHDCI connector on the custom PCB using the older NI SHC68-C68-D2 cable. The connection between the VHDCI connector and the DUT is routed on the custom PCB.
Using a custom PCB will be described in more detail in the following section.