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ATR4255 Datasheet(PDF) 3 Page - ATMEL Corporation

Part # ATR4255
Description  AM/FM RECEIVER IC
PDF  32 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATR4255 Datasheet(HTML) 3 Page - ATMEL Corporation

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ATR4255
4837A–AUDR–10/04
Pin Description
Pin
Symbol
Function
1MX1FMA
1
st mixer FM input A
2MX1FMB
1
st mixer FM input B
3
MX1AMB
1
st mixer AM input B
4
GNDMX
Ground 1
st mixer, preamplifier AGC
5
FMAGC
FM preamplifier AGC
6AMVREG
AM control voltage
7
AMAGC
AM preamplifier AGC
8
AMPLPF
AM AGC LP filter
9
METER
Field strength output
10
ADJAC
Adjacent channel detection output
11
MPX
Multiplex signal
12
V57
5.7 V reference voltage
13
OSCB
Oscillator basis
14
OSCE
Oscillator emitter
15
GNDOSC
Oscillator ground
16
OSCOUT
Oscillator output
17
EN
3-wire bus enable
18
CLK
3-wire bus clock
19
DATA
3-wire bus data
20
IF2OUT
2
nd IF amplifier output
21
INT
Interrupt, stop signal
22
MX2LO
10.25 MHz input for 2
nd mixer
23
MX2OB
2
nd mixer output B
24
MX2OA
2
nd mixer output A
25
GND
Ground
26
MX2IN
2
nd mixer input
27
V3P
3 V reference for AMPIN, AMIFAGC, Control, IF2IN
28
IF2IN
2
nd IF amplifier input
29
V3
3 V reference for IF1OUT, MX2IN
30
IF1OUT
1
st IF amplifier output
31
DEV
Deviation detect output, test output
32
OPLPF
Operating point LPF
33
IF1AMI
1
st IF AM amplifier input
34
SMUTE
Soft MUTE control input
35
IFAGCH
IF AGC LP filter high time
36
IFAGCL
IF AGC LP filter low time constant
37
FILADJ
Filter adjust
38
IF1FMI
1
st IF FM amplifier input
39
IF1REF
1
st IF and MX1OUT reference, MX1AM A, MX1AM B
40
MULTIP
Multipath detection output
41
MX1AMA
1
st mixer AM input A
42
VS
Supply voltage
43
MX1OA
1
st mixer output A
44
MX1OB
1
st mixer output B



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