
3. External Connection
VNA-300M-PCI
29
Connecting the Digital I/O Signals
This section provides an example of using a BNC cable to connect the digital I/O signals.
Use a BNC cable (BNC-Bxxx; sold separately) or a similar item to connect an external device to the
BNC connector of the TRG.
The digital I/O signals use positive-logic input. These I/O signals are 3.3V, LVTTL level signals.
Input
BOARD
TRG
Target
3.3V
10k
Ground
50
SN74LVC245A
Shield cable
Figure 3.7. Connecting the Digital Input
BOARD
3.3V
10k
50
TRG
Shield cable
SN74LVC245A
Output
Target
Ground
Figure 3.8. Connecting the Digital Output
CAUTION
-
You can use a 5V TTL signal for the digital input.
-
When the power turns on, the TRG terminal is set as an input.
Содержание VNA-300M-PCI
Страница 1: ...PC HELPER Network Analyzer Bord for PCI VNA 300M PCI User s Guide CONTEC CO LTD...
Страница 7: ...vi VNA 300M PCI...
Страница 15: ...1 Introduction 8 VNA 300M PCI...
Страница 49: ...5 About Software 42 VNA 300M PCI...