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ATR4255-ILSH Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATR4255-ILSH Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 32 page  11 ATR4255 4837A–AUDR–10/04 FM Demodulator For weather band reception, the gain of the FM demodulator is increased and can be adjusted by means of bit 71, bit 72 in order to increase the output voltage to compen- sate the low frequency deviation in weather band. An integrated demodulator fine adjustment allows automatic fine tuning of the demodu- lator center frequency to the average frequency of the received signal. This feature is implemented for use in weather band mode and can be activated by setting bit 53 to 0. Figure 5. FM Demodulator Automatic Fine Tuning The center frequency of the FM demodulator can be adjusted by means of bit 56 to 59. At the center frequency, the DC voltage at the MPX output pin 11 is equal to the MPX offset voltage that can be measured at pin 11 while MPX mute is active (bit 7 = 1). This adjustment will affect the center frequency of all integrated filters as mentioned before. Table 16. Demodulator Gain in Weather Band Mode Demodulator Gain in Weather Band Mode Relative to FM Mode Bit 72 Bit 71 12 dB 0 0 15 dB 0 1 18 dB 1 0 21 dB 1 1 Table 17. Demodulator Fine Adjustment Demodulator Fine Adjustment Bit 53 Fine tuning ON 0 Fine tuning OFF 1 FM demod + (10 nF) AM AGC B92 Center freq. Bit 53 Automatic frequency adjustment MPX IFAGCH V3 |
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