ATR4258 Datasheet, PDF (15/38 Pages) ATMEL Corporation – AM/FM RECEIVER IC

ATR4258
Table 22. Maximum Soft Mute
Maximum Value of Soft Mute
30 dB
26 dB
Figure 6. Soft Mute
+
Pin 34
FS (pin 9)
Bits 68 to 70
Pin 29
Bit 67
0
1
Bit 67
Gain FM demodulator
V3
MPX Output
Receiving Condition
Analyzer
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 23. MPX Output Mute
MPX Output
MPX out, pin 11 normal operation
Mute ON
Bit 7
0
1
Table 24. MPX Output Bandwidth
Bandwidth MPX Low-pass Filter
90 kHz
180 kHz
Bit 79
0
1
The ATR4258 implements several sensors that provide information about the receiving
condition of the selected station.
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4838A–AUDR–10/04