U4255BM-M Datasheet, PDF (27/32 Pages) ATMEL Corporation – AM / FM RECEIVER IC

U4255BM-M
Figure 16. Deviation Sensor Frequency Response
FM frequency deviation: 22.5 kHz
1.0
0.5
0.0
100
1000
10000
FM modulation frequency (Hz)
100000
Figure 17. FM Input Level Sweep
Soft mute threshold Bits 68, 69 = 0, Bit 70 = 1; soft mute gain Bit 67 = 1
gain FM IF amplifier Bit 89 = 1, Bits 90, 91 = 0
10
5
0
4.5
Signal
-10
4
-20
3.5
Sensor output
-30
3
-40
2.5
-50
2
Noise
-60
1.5
-70
1
-20
0
20
40
60
80
100
120
Input level (dBµV)
27
4519C–AUDR–07/02