U4283BM
AM / FM - PLL
Description
The U4283BM is an integrated circuit in BICMOS
technology for frequency synthesizer. It performs all the
functions of a PLL radio tuning system and is controlled
by I
2
C bus. The device is designed for all frequency
synthesizer applications of radio receivers, as well as
RDS (Radio
Data System)
applications.
Features
D
Reference oscillator up to 15 MHz
D
Two programmable 16 bit dividers
adjustable from 2 to 65535
D
Three programmable switching outputs
(open drain up to 20 V)
D
Fine tuning steps:
AM
FM
y
1 kHz
y
2 kHz
D
Few external component requirements due
to integrated loop-transistor for AM/FM
D
High signal/ noise ratio
Block Diagram
PRT SWO1 SWO2 SWO3
OSCIN
OSCOUT
18
Oscillator
19
2
3
4
Latch
I
2
C–BUS
Interface
Shift register
AM/FM
9
5
R-Divider
6
7
8
Switching outputs
Latch
Status
14
Phase
detector
Current
sources
15
13
PDFM
PDAM
PDFMO
PDAMO
LD
SCL
SDA
AS
Latch
10
Preamplifier
:2
FMOSC
12
Preamplifier
AM/FM
switch
AMOSC
N–Divider
Analogue
outputs 16
Lock
detector
17
11
GND 2
1
VDD
Figure 1.
20
GND 1
94 8054 e
Ordering and Package Information
Extended Type Number
U4283BM-BFL
U4283BM-BFLG3
U4283BM-BFS
Package
SO20 plastic
SO20 plastic
SSO20 plastic
Remarks
Taping according to IEC-286-3
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
1 (9)
Preliminary Information
TEMIC [ TEMIC SEMICONDUCTORS ]
