u4255bm ATMEL Corporation, u4255bm Datasheet - Page 8

• Manufacturer Part Number: u4255bm
• Description: Am/fm Receiver
• Manufacturer: ATMEL Corporation

Level Control of the FM AGC threshold
Level Control of the AM AGC threshold
Bits 60 and 61 control the bandwidth of the 2nd mixer
output tank, in FM mode
U4255BM
8 (12)
FM Bandwidth Mixer 2
AM AGC Threshold
FM AGC Threshold
103 dBmV
102 dBmV
105 dBmV
107 dBmV
108 dBmV
97 dBmV
92 dBmV
85 dBmV
150 kHz
200 kHz
250 kHz
450 kHz
Bit 65
Bit 63
Bit 61
0
1
0
1
0
1
0
1
0
1
0
1
Bit 64
Bit 62
Bit 60
0
0
1
1
0
0
1
1
0
0
1
1
Setting of the center frequency of the integrated FM band
filter and demodulator
Function of Pin 20 setting is done by Bit 55
Setting Bit 54 = 1 enables the use of an additional external
band filter (Pin 23/24 to Pin 28), in FM mode
The Bits 52 and 53 are not used.
Pin 21: IF out/ Field Strength for Multipath
450.00 kHz
456.25 kHz
461.50 kHz
468.75 kHz
475.00 kHz
481.25 kHz
487.50 kHz
493.75 kHz
450.00 kHz
443.75 kHz
437.50 kHz
431.25 kHz
425.00 kHz
418.75 kHz
412.50 kHz
406.25 kHz
IF Center
External and internal filter
Multipath field strength
2nd IF output
Internal filter
2nd IF Filter
Bit 59
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Bit 58
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Rev. A1, 26-Jun-00
Bit 57
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 55
Bit 54
Bit 56
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1