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U4280BM-B Schematic ( PDF Datasheet ) - TEMIC Semiconductors

Teilenummer U4280BM-B
Beschreibung AM / FM - PLL
Hersteller TEMIC Semiconductors
Logo TEMIC Semiconductors Logo 




Gesamt 9 Seiten
U4280BM-B Datasheet, Funktion
AM / FM - PLL
U4280BM
Description
The U4280BM 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 Frequency range up to 150 MHz
D Pre-amplifier for AM and FM
yD Fine tuning steps: AM 1kHz
yFM 2 kHz
D Two programmable 16-bit divider,
adjustable from 2 to 65535
Ordering Information
Extended Type Number
U4280BM-B
U4280BM-BFL
D Reference oscillator up to 15 MHz
D 5 programmable switching outputs,
4 are open drain outputs up to 15 V
D Phase detector with separate outputs for AM and FM
D Controlled via I2C bus
Package
DIP20
SO20
Remarks
Block Diagram
OSCIN 18
19
OSCOUT
Oscillator
SCL
SDA
AS
2
3
4
I2C – BUS
interface
R – Divider
Latch
Shift register
Latch
12
AMOSC
Preamplifier
AM / FM–
switch
N – Divider
PRT SWO1 SWO2 SWO3 AM/FM
56789
Switching outputs
Latch
Status
Phase
detector
Current
sources
Analog
outputs
14
PDFM
15
PDAM
13
PDFMO
16
PDAMO
10
FMOSC
Preamplifier : 2
11
GND2
1
VDD
20
GND1
Figure 1. Block diagram
Lock
detector
17
LD
13346
TELEFUNKEN Semiconductors
Rev. A1, 10-Apr-97
Preliminary Information
1 (9)






U4280BM-B Datasheet, Funktion
U4280BM
Bus Timing
twSTA
SDA
tsSTA
tLOW
tHIGH
tf
tr
SCL
thSTA
START
CLOCK
tsDAT
DATACHANGE
thDAT
Figure 5. Bus timing
tsSTO
STOP
13347
VDD
3 k
PDFM
PDAM
22 k
13 PDFMA
16 PDAMA
13401
Figure 6. Analog outputs PDFMA, PDAMA
6 (9) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 10-Apr-97

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