SC5305A Operating & Programming Manual
Rev 2.1.0
6
Signal Connections
RF IN
This port accepts input signals from 1 MHz to 3.9 GHz to the downconverter. The nominal
input impedance is 50 Ω. Maximum input power is +27 dBm.
IF OUT
This port outputs the 70 MHz IF signal from the downconverter. The nominal output
impedance is 50 Ω.
REF IN
This port accepts an external 10 MHz reference signal, allowing an external source to
synchronize the internal reference clock. This port is AC-coupled with a nominal input
impedance of 50 Ω. Maximum input power is +13 dBm.
REF OUT
This port outputs the internal 10 MHz or 100 MHz reference clock. If the internal reference
clock is synchronized to an external reference clock through the 10 MHz “
ref in
” port, this
output port will also be synchronized. This port is AC- coupled with a nominal output
impedance of 50 Ω.
PXI CLK10
This port outputs the 10 MHz chassis reference signal from the chassis backplane, allowing it
to synchronize the internal reference clock. An MCX male to SMA male cable is required (but
not supplied) to connect this port to the “
ref in
” port in order to use this reference for
synchronization. This port may be enabled or disabled through a software switch to
minimize possible clock noise when not in use. This port has a nominal output impedance of
50 Ω and drives 0 dBm into a 50 Ω load.
Indicator LEDs
The SC5305A provides visual indication of important modes. There are two LED indicators on the device.
Their behavior under different operating conditions is shown in Table 1.
Table 1. LED indicator states.
LED
Color
Definition
STATUS
Green
“Power good” and all oscillators phase-locked
STATUS
Red
One or more oscillators off lock
STATUS
Off
Power fault
ACTIVE
Green/Off
Device is open (green) /closed (off) , this indicator is also
user programmable (see register map)
ACTIVE
Orange
User initiated standby mode