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U4255BM-M Datasheet

  • U4255BM-M

  • AM/FM car receiver IC

  • 32頁

  • ETC

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Features
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FM Double-conversion System
Integrated Second IF Filter with Software-controlled Bandwidth
Completely Integrated FM Demodulator
Soft Mute and Multipath Noise Cancellation
Receiving Condition Analyzer
AM Up/Down-conversion System
AM Preamplifier with AGC and Stereo Capability
3-wire Bus Controlled
Search Stop Signal Generation for AM and FM
Automatic Alignment Possible
Electrostatic sensitive device.
Observe precautions for handling.
AM/FM
Receiver IC
U4255BM-M
Description
The U4255BM-M is a highly integrated AM/FM front-end circuit manufactured using
Atmel鈥檚 advanced BICMOS technology. It represents a complete, automatically adjust-
able AM/FM front end, containing a double-conversion system for FM and an
up/down-conversion receiver for AM with IF1 = 10.7 MHz and IF2 = 450 kHz. The
front end is suitable for digital or analog AF-signal processing. Together with the PLL
U4256BM, an automatically aligned high-performance AM/FM tuner can be built.
These ICs are dedicated for highly sophisticated car radio applications.
Preliminary
Pin Configuration
Figure 1.
Pinning SSO44
MX1AMA
MULTIP
IFAGCL
IFAGCH
MX2OA
INT 21
24
30 IF1OUT
MX1OB
MX1OA
IF1REF
SMUTE
IF1FMI
OPLPF
IF1AMI
31 DEV
MX2OB
MX2LO 22
23
FILADJ
MX2IN
26
DATA 19
IF2IN
GND
IF2OUT 20
25
V3P
CLK 18
27
VS
29
OSCOUT 16
V3
44
43
42
41
40
39
38
37
36
35
34
33
MPX 11
V57 12
OSCB 13
32
OSCE 14
GNDOSC 15
MX1FMA
MX1FMB
MX1AMB
GNDMX
AMVREG
AMPLPF
FMAGC
AMAGC
METER
ADJAC 10
EN 17
1
2
3
4
5
6
7
8
9
28
Rev. 4519C鈥揂UDR鈥?7/02
1

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