U4286BM Datasheet, PDF (1/9 Pages) TEMIC Semiconductors – AM / FM-PLL

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 I²C 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
y D Fine tuning steps: AM 1 kHz
y FM 2 kHz
D Two programmable switching outputs (open drain up
to 20 V)
D Few external component requirements due to
integrated loop-transistor for AM/FM
D High signal/ noise ratio
Block Diagram
OSCIN
OSCOUT
14
Oscillator
15
R–Divider
SWO 1 SWO 2
5
6
Switching outputs
2
SCL
SDA ³
4
AS
I²C–BUS
Interface
FMOSC ^{7 Preamplifier :} 2
Latch
Shift register
Latch
Latch
Status
Phase
detector
9
AMOSC
Preamplifier
AM/FM
switch
8
GND 2
N–Divider
1
VDD
16
GND 1
11
Current
sources
12
10
Analogue
outputs ¹³
PDFM
PDAM
PDFMO
PDAMO
93 7581 e
Figure 1.
Rev. A1: 19.08.1996
Preliminary Information
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