AN543
Rev. 0.9
245
Property 0x200D AM_VALID_FREQOFF_FILTER
The AM_VALID_FREQOFF_FILTER sets the number of FREQOFF samples averaged by the metric filter before
reporting FREQOFF as part of AM_RSQ_STATUS. 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-A30 and earlier: This property is not available.
Si475x-A40 and later, Default: 100
Property 0x2100 AM_NB_DETECT_THRESHOLD
The AM_NB_DETECT_THRESHOLD property sets the threshold for detecting impulses in dB above the noise
floor. The noise blanker can be disabled by setting the noise blanker detect threshold to 0.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.
Default: 18
Units: dB
AM_VALID_RSSI_THRESHOLD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00
FILTER[7:0]
0x00
0x64
Bit
Name
Function
15:8
Reserved
Always write 0.
7:0
FILTER[7:0]
The number of FREQOFF values that are averaged when reporting the value
in AM_RSQ_STATUS. (Values below 10 will begin to track audio and are not
recommended. If low-cut is being used then the minimum value will need to
be increased accordingly to avoid tracking low frequency audio.)
Default is 100 samples. Range is 0–127.
AM_NB_DETECT_THRESHOLD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DETECT_THRESHOLD[15:0]
0x0012
Bit
Name
Function
15:0
DETECT_THRESHOLD[15:0]
Sets the threshold for detecting impulses in dB above the
noise floor. Default is 18 dB. Range is 0–90 dB.
To disable the noise blanker, set the DETECT_THRESH-
OLD to 0.
