ATR4258
Table 4-22.
Maximum Soft Mute
Maximum Value of Soft Mute
30 dB
26 dB
Bit 67
0
1
Figure 4-4.
Soft Mute
+
Pin 3 4
F S ( pin  9)
Bit 67
+
-
G a in
FM demod u l a tor
Bit s 6 8 to 70
Pin 29
V 3
4.18
MPX Output
The output of the AM demodulator (AM mode) or the output of the FM demodulator (FM/WB
mode) are available at the MPX output (pin 11).
The MPX output signal can be muted by setting bit 7 to 1.
The bandwidth of the low-pass filter at the MPX output can be set by means of bit 79 to 90 kHz
or 180 kHz.
Table 4-23.
MPX Output Mute
MPX Output
MPX out, pin 11 normal operation
Mute ON
Bit 7
0
1
Table 4-24.
MPX Output Bandwidth
Bandwidth MPX Low-pass Filter
90 kHz
180 kHz
Bit 79
0
1
4.19
Receiving Condition Analyzer
The ATR4258 implements several sensors that provide information about the receiving condition
of the selected station.
15
4838B–AUDR–05/05
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