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U4286BM-BFP Datasheet

  • U4286BM-BFP

  • AM / FM-PLL

  • 9頁

  • TEMIC

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TELEFUNKEN Semiconductors
U4286BM
AM / FM-PLL
Description
The U4286BM 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
Two programmable switching outputs (open drain up
to 20 V)
D
Fine tuning steps: AM
y
1 kHz
FM
y
2 kHz
D
Few external component requirements due to
integrated loop-transistor for AM/FM
D
High signal/ noise ratio
Block Diagram
SWO 1
OSCIN
OSCOUT
14
Oscillator
15
2
3
4
7
Latch
I
2
C鈥揃US
Interface
Shift register
SWO 2
6
5
R鈥揇ivider
Switching outputs
Latch
Status
11
Phase
detector
Preamplifier
SCL
SDA
AS
FMOSC
Latch
Current
sources
:2
PDFM
PDAM
PDFMO
PDAMO
12
10
AMOSC
9
Preamplifier
AM/FM
switch
8
GND 2
N鈥揇ivider
1
VDD
Figure 1.
Analogue
outputs 13
16
GND 1
93 7581 e
Rev. A1: 19.08.1996
Preliminary Information
1 (9)

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