U4255BM-M Datasheet, PDF (2/32 Pages) ATMEL Corporation – AM / FM RECEIVER IC

Pin Description
Pin
Symbol
1
MX1FMA
2
MX1FMB
3
MX1AMB
4
GNDMX
5
FMAGC
6
AMVREG
7
AMAGC
8
AMPLPF
9
METER
10
ADJAC
11
MPX
12
V57
13
OSCB
14
OSCE
15
GNDOSC
16
OSCOUT
17
EN
18
CLK
19
DATA
20
IF2OUT
21
INT
22
MX2LO
23
MX2OB
24
MX2OA
25
GND
26
MX2IN
27
V3P
28
IF2IN
29
V3
30
IF1OUT
31
DEV
32
OPLPF
33
IF1AMI
34
SMUTE
35
IFAGCH
36
IFAGCL
37
FILADJ
38
IF1FMI
39
IF1REF
40
MULTIP
41
MX1AMA
42
VS
43
MX1OA
44
MX1OB
Function
1^st mixer FM input A
1^st mixer FM input B
1^st mixer AM input B
Ground 1^st mixer, preamplifier AGC
FM preamplifier AGC
AM control voltage
AM preamplifier AGC
AM AGC LP filter
Field strength output
Adjacent channel detection output
Multiplex signal
5.7 V reference voltage
Oscillator basis
Oscillator emitter
Oscillator ground
Oscillator output
3-wire bus enable
3-wire bus clock
3-wire bus data
2^nd IF amplifier output
Interrupt, stop signal
10.25 MHz input for 2^nd mixer
2^nd mixer output B
2^nd mixer output A
Ground
2^nd mixer input
3 V reference for AMPIN, AMIFAGC, Control, IF2IN
2^nd IF amplifier input
3 V reference for IF1OUT, MX2IN
1^st IF amplifier output
Deviation detect output, test output
Operating point LPF
1^st IF AM amplifier input
Soft MUTE control input
IF AGC LP filter high time
IF AGC LP filter low time constant
Filter adjust
1^st IF FM amplifier input
1^st IF & MX1OUT reference, MX1AM A, MX1AM B
Multipath detection output
1^st mixer AM input A
Supply voltage
1^st mixer output A
1^st mixer output B
2 U4255BM-M
4519C–AUDR–07/02