Keysight Technologies L4490A, Руководство пользователя

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Keysight L4490A/L4491A User’s Guide 137
Additional Operating Information
Paired Mode
Drive Modes
The 34945EXT module within the L4490A/L4491A RF Switch Platform can drive
switches and attenuators using either TTL or open collector drive methods. The
TTL drive mode uses active drive for both high and low levels and drives a TTL
high level when asserted. The open collector drive provides a current path to
ground when asserted.
Figure 5-1. TTL and Open Collector Drive Modes.
The drive mode is set on a per bank basis and is included in the distribution
board’s preset configuration. The drive mode can be changed using the
command:
ROUTe:RMODule:BANK:DRIVe:MODE
LED1 Connector LED2 Connector
Pin Use Pin Use Pin Use Pin Use
1 +VI 2 SW1 - A 1 +VI 2 SW1 - B
3 +VI 4 SW2 -A 3 +VI 4 SW2 - B
5 +VI 6 SW3 - A 5 +VI 6 SW3 -B
7 +VI 8 SW4 - A 7 +VI 8 SW4 - B
9 +VI 10 SW5 - A 9 +VI 10 SW5 - B
11 +VI 12 SW6 - A 11 +VI 12 SW6 - B
13 +VI 14 SW7- A 13 +VI 14 SW7 - B
15 +VI 16 SW8 - A 15 +VI 16 SW8 - B
TTL Drive
Open Collector
Drive
Drive Active
H
H
L
L