AN543
Rev. 0.9
225
Bit
Name
Function
15:9
Reserved
In Si475x-A20 and earlier, always write 0000000.
In Si475x-A30 and later, always write 1111000.
8
FMLNAZ
0 = Normal LNA mode where the LNA input impedance is 50
1 = LNA loopthru mode where LNA input impedance is 100
7:6
Reserved
Always write to 10.
5
ATTENFM
0 = FM attenuators are turned on to improve FM intrusion.
1 = FM attenuators are off. This is the preferred setting to minimize desensi-
tization for a multiple receiver system sharing a single antenna.
4
HARMREJ
0 = Harmonic reject is disabled.
1 = Harmonic reject is enabled.
3:0
INPUTSELECT[3:0]
4 = Receive signal comes into the AMI
