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4.20
Field Strength Sensor
The field strength sensor provides a DC voltage at pin 9 which represents the logarithmic field
strength of the signal in the reception band.
The field strength information can be retrieved either from a level detector at the input of the 2 nd
mixer (pin 26) or from the IF-AGC depending on the setting of bit 80. The bandwidth of the field
strength detection in the AGC is smaller than by using the level detector because of additional
selectivity between the 2 nd mixer and the 2 nd IF amplifier particularly in AM and WB, but the field
strength detection in the AGC is limited to the IF AGC range. Usually the field strength from the
level detector is used in FM/WB mode and the AGC field strength is used in AM mode.
The field strength output at pin 9 can be adjusted by the bits 18 to 21 in 0.5 dB steps. This offset
also has an influence on the soft mute levels.
Table 4-25.
Field Strength Offset
Offset Field Strength
0.0 dB
0.5 dB
1.0 dB
...
7.5 dB
Bit 21
0
0
0
...
1
Bit 20
0
0
0
...
1
Bit 19
0
0
1
...
1
Bit 18
0
1
0
...
1
4.21
Field Strength Selection
Bit 80 and bit 13 allows the switches between narrow-band field strength and wide-band field
strength information.
Table 4-26.
Field Strength (Combined)
4.22
Field Strength (Pin 9) Narrow-band/Wide-band
FM field strength (wide band)
Multipath field strength and FM field strength (wide band)
AM AGC field strength (narrow band)
Multipath field strength and AM AGC field strength (narrow band)
Search Stop Detector
Bit 80
0
0
1
1
Bit 13
0
1
0
1
A search stop detector is available in AM and FM/WB mode. A STOP condition is signaled (with
a low level at pin 21) if the frequency of the IF signal is within a window around the center fre-
quency of 450 kHz. The width of this search stop window can be set by bit 85 to bit 87 in the
range of 0.5 kHz to 80 kHz. The frequency of the IF signal is measured by counting the number
of periods of the IF signal during a measurement time which is determined by bit 73 to bit 78.
The inverted STOP signal is available at pin 21 according to Table 4-29 on page 17 . The fre-
quency of 10.25 MHz at pin 22 is used as a time reference.
16
ATR4258
4838B–AUDR–05/05
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