AN543
Rev. 0.9
229
Property 0x070E AM_LNA_PD_THRESHOLD
The AM_LNA_PD_THRESHOLD property sets the high threshold and hysteresis for the LNA peak detector. The
high threshold sets the level at which the AGC increases attenuation. The hysteresis is how many dB below the
high threshold the level must drop before the AGC decreases attenuation. The CTS bit (and optional interrupt) is
set when it is safe to send the next command. This property may only be set or read in powerup mode.
Si475x-A40 and earlier, Default: 0x5104
Si475x/5xC-A55, Default: 0x5904
AM_LNA_PD_THRESHOLD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
HIGH[7:0]
HYST[7:0]
0x51
0x04
Bit
Name
Function
15:8
HIGH[7:0]
Sets the level in dBµV at which AGC increases attenuation.
HIGH[7:0] Range: 79–93.
79 = 79 dBµV.
81 = 81 dBµV.
83 = 83 dBµV.
85 = 85 dBµV.
87 = 87 dBµV.
89 = 89 dBµV.
91 = 91 dBµV.
93 = 93 dBµV.
7:0
HYST[7:0]
Sets how many dB below the high threshold the level must drop before the AGC
decreases attenuation.
HYST[7:0] Range: 3–6.
3 = 3 dB.
4 = 4 dB.
5 = 5 dB.
6 = 6 dB.
