u4255bm ATMEL Corporation, u4255bm Datasheet - Page 2

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

Pin Description
U4255BM
2 (12)
MX1AMB
AMVREG
MX1FMA
MX1FMB
GNDOSC
OSCOUT
AMPLPF
GNDMX
AMAGC
FMAGC
METER
IF2OUT
MX2LO
ADJAC
OSCB
OSCE
DATA
MPX
CLK
V57
INT
EN
10
11
12
13
14
15
16
17
18
19
20
21
22
1
2
3
4
5
6
7
8
9
Figure 2. Pinning
14856
34
33
32
44
43
42
41
40
39
38
37
36
35
24
28
23
31
30
29
27
26
25
VS
MX1AMA
MULTIP
IF1REF
IF1FMI
SMUTE
IF1AMI
OPLPF
DEV
IF1OUT
MX1OB
MX1OA
IFAGCL
IFAGCH
FILADJ
V3
IF2IN
V3P
MX2IN
GND
MX2OA
MX2OB
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1
2
3
4
5
6
7
8
9
MX1AMA 1st mixer AM input A
MX1FMA 1st mixer FM input A
MX1AMB 1st mixer AM input B
AMVREG AM control voltage
MX1FMB 1st mixer FM input B
GNDOSC Oscillator ground
OSCOUT Oscillator output
AMPLPF
GNDMX
AMAGC
IFAGCH
MULTIP
FMAGC
IF2OUT
MX2LO
MX2OB
MX2OA
IF1OUT
IFAGCL
MX1OA
MX1OB
METER
SMUTE
IF1AMI
FILADJ
Symbol
ADJAC
MX2IN
IF1FMI
IF1REF
OPLPF
OSCB
OSCE
DATA
IF2IN
MPX
GND
CLK
DEV
V57
V3P
INT
EN
V3
VS
Ground 1st mixer
FM preamplifier AGC
AM preamplifier AGC
AM AGC LP filter
Fieldstrength output
Adjacent channel detection output
Multiplex signal
5.7 V reference voltage
Oscillator basis
Oscillator emitter
3-wire bus enable
3-wire bus clock
3-wire bus data
2nd IF amplifier output
Interrupt, stop signal, test out
10.25 MHz input for 2nd mixer
2nd mixer output B
2nd mixer output A
Ground
2nd mixer input
3 V reference for AMPIN,
AMIFAGC, Control, IF2IN
2nd IF amplifier input
3 V reference for IF1OUT, MX2IN
1st IF amplifier output
Deviation detect output
Operating point LPF
1st IF AM amplifier input
Soft MUTE control input
IF AGC LP filter high time
IF AGC LP filter low time constant
Filter adjust
1st IF FM amplifier input
1st IF & MX1OUT reference,
MX1AM A, MX1AM B
Multipath detection output
Supply voltage
1st mixer output A
1st mixer output B
Function
Rev. A1, 26-Jun-00