U4255BM-MFN Atmel, U4255BM-MFN Datasheet - Page 14

• Manufacturer Part Number: U4255BM-MFN
• Description: IC RCVR AM/FM FRONT-END 44-SSOP
• Manufacturer: Atmel

Specifications of U4255BM-MFN

• Frequency: 70MHz ~ 160MHz
• Modulation Or Protocol: AM, FM
• Applications: AM/FM Radio Receiver
• Current - Receiving: 50mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 7.5 V ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -

Adjacent Channel
Sensor
14
U4255BM-M
The adjacent channel sensor is active in FM mode only and measures the field strength
outside the reception band. By setting the center frequency of the band filter of the adja-
cent channel sensor below or above the 2
determined whether the disturbance signal is located above or below the reception fre-
quency (see Table 27). The bandwidth of the band filter used in the adjacent channel
sensor can be changed by means of Bit 10 to 13. If Bit 4 = 0 the default bandwidth set-
ting is used. The output of the adjacent channel sensor is independent of the bandwidth
setting of the integrated FM band filter.
Figure 8. Adjacent Channel Sensor
Table 25. Bandwidth of the Adjacent Channel Detector Filter
Table 26. Center Frequency Adjacent Channel Sensor
BW Adjustment
80 kHz (default)
110 kHz
110 kHz
130 kHz
145 kHz
160 kHz
16 kHz
32 kHz
50 kHz
65 kHz
80 kHz
95 kHz
50 kHz
65 kHz
95 kHz
Center Frequency
3 kHz
Filter OFF
450 kHz
300 kHz
700 kHz
IF
intergr. FM bandfilter
Bit 13
log
log
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
+
-
nd
IF frequency (Bit 5, Bit 6), it can be
Bit 12
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 6
+
0
0
1
1
50k
4k
Bit 11
Pin 10
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
4519A–AUDR–03/02
Bit 5
0
1
0
1
Bit 10
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1