T4258 Datasheet, PDF (1/17 Pages) ATMEL Corporation – AM/FM Receiver IC

AM/FM Receiver IC
T4258
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
IF1AMI
V3 MX2OB
MX1OA MX1OB
IF1REF
IF1OUT MX2IN
MX2OA
43
44
38 39 33 30 29 26 23
24
IF2IN V3P
28
27
AM
FM
AM
Dem.
OPLPF
32
41
MX1AMA
AM
3
MX1AMB
7
AMAGC
AMVREG
AMPLPF
6
AGC
8
V3
Noise–
blanker
AGC
MX1FMA
1
MX1FMB
2
GNDMX
4
OSCOUT
16
GNDOSC
15
OSCE
14
OSCB ₁₃
FM
Divider
2...10
Offset
Divider
V3
OSC
Bandgap
ÏÏ
Bus
12 25 42 5 17 18 19 9
V57 VS
EN DATA METER
GND FMAGC CLK
Adj.
Chan.
Stop
22 10
MX2LO ADJAC
INT
21
INT
Figure 1. Block diagram
FM
Dem.
AGC
IFAGCL
36
IFAGCH
35
IF2OUT
20
Automatic
Adjustment ₃₇
FILADJ
Multi–
ÏÏÏÏ_{path 40}
MULTIP
Soft
Mute
MPX
11
34
SMUTE
Dev.
Ana.
31
DEV
Ordering Information
Extended Type Number
T4258-ILQ
T4258-ILS
SSO44
SSO44
Package
Remarks
Taped and reeled
Tube
Rev. A1, 10-Jan-01
1 (17)