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T4258-ILS Datasheet

  • T4258-ILS

  • AM/FM Receiver IC

  • 17頁

  • ATMEL   ATMEL

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T4258
AM/FM Receiver IC
Description
The T4258 is an integrated AM/FM frontend circuit in
BICMOS technology. It contains a double conversion
system for FM and an up-/down conversion circuit for
AM (IF1 = 10.7 MHz, IF2 = 450 kHz). A complete
automatically aligned high performance AM/FM tuner
can be built together with the PLL U4256BM. This ICs
are designed for high performance car radio applications.
Electrostatic sensitive device.
Observe precautions for handling.
Features
D
Receiving condition analyzer
D
Integrated band filter for 2nd IF;
with software controlled bandwidth
D
Pin compatible with U4255BM
D
FM-double conversion system
D
World tuner, US Weatherband, J-band
D
Completely integrated FM demodulator
D
Soft mute and multipath noise cancellation
D
AM up-/down conversion system
D
AM stereo capability
D
Stop signal generation for AM and FM
D
Automatic alignment possible
D
3-wire bus controlled
Block Diagram
IF1FMI
MX1OA MX1OB
43
44
38
V3
IF1AMI
MX2OB
IF1REF
IF1OUT MX2IN
MX2OA
39
33 30
AM
FM
41
MX1AMA
7
AMAGC
AGC
AMVREG
6
AMPLPF
8
AGC
MX1FMA
MX1FMB
GNDMX
OSCOUT
16
Divider
1
2
4
Divider
2...10
Offset
Adj.
Chan.
Stop
FM
Dem.
Soft
Mute
FM
MX1AMB
3
AM
V3
Noise鈥?/div>
blanker
AGC
IFAGCL
IFAGCH
IF2OUT
29
26
23
24
IF2IN V3P
28
27
AM
Dem.
32
OPLPF
36
35
20
Automatic
FILADJ
Adjustment 37
15
14
13
OSC
V3
Bandgap
12
25 42
5
OSCE
OSCB
17 18
V57
VS
EN
DATA METER
GND
FMAGC CLK
Ordering Information
Extended Type Number
T4258-ILQ
T4258-ILS
Package
SSO44
SSO44
Taped and reeled
Tube
Remarks
Rev. A1, 10-Jan-01
脧脧
Bus
GNDOSC
INT
19
9
22
10
21
INT
34
SMUTE
MX2LO ADJAC
Figure 1. Block diagram
脧脧
脧脧
Multi鈥?/div>
path 40 MULTIP
11
MPX
Dev.
Ana.
31
DEV
1 (17)

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