Norsat 25W ATOM User Manual
Page 12
ATOM 25W/40W/50W
Revision 1.1
908239
12
908239_r1.1 - Operator Manual ATOM KU
25-40-50W.doc
Figure 2-1: J2 Connector Pin Out, Viewed Looking at SSPA/BUC from the Outside
P
IN
D:
S
HUTDOWN
(
I
.
E
.
M
UTE
C
ONTROL
)
This pin implements the shutdown, or mute function, and the user should apply Ground to this pin to mute
the amplifier. When muted, the unit power transistors are turned off, reducing power consumption and
giving an RF output noise close to the thermal noise floor.
Pin D has an internal 50K-ohm resistor that can be configured as a pull-up to 4V, or as a pull down to
ground. Because of the configurable pull-up / pull-down resistor, the unit can be configured to be active
(i.e. not muted) when Pin D is left open circuited, therefore, no connection is necessary on pin D for the
amplifier to operate normally.
Pin D is also configurable to be either active high or active low. When configured as active high, any
voltage between 3.0 V and 5.0 V (relative to case ground) will mute the output. When configured as
active low, any voltage between 0.0 V and 0.8 V (relative to case ground) will mute the output.
The case ground may be connected at any location on the outer metal shell of the unit.
P
IN
G
AND
H:
GND
Ground is connected to the amplifier housing. This pin is electrically connected to the outer aluminum
shell and thus to the mounting screws used to hold down the unit. This is for small signal only; any high-
current connections should use the external screws on the outside of the aluminum case.
A
B
C
D
E
F
G
H
J
K