U4280
| Model | U4280 |
| Description | AM / FM - PLL |
| PDF file | Total 9 pages (File size: 175K) |
| Chip Manufacturer | TEMIC |
U4280BM
AM / FM - PLL
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 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
Frequency range up to 150 MHz
D
Pre-amplifier for AM and FM
D
Fine tuning steps: AM 1kHz
D
Two programmable 16-bit divider,
adjustable from 2 to 65535
D
Reference oscillator up to 15 MHz
D
5 programmable switching outputs,
4 are open drain outputs up to 15 V
y
FM
y
2 kHz
D
Phase detector with separate outputs for AM and FM
D
Controlled via I
2
C bus
Ordering Information
Extended Type Number
U4280BM-B
U4280BM-BFL
Package
DIP20
SO20
Remarks
Block Diagram
PRT
OSCIN 18
19
OSCOUT
Latch
SCL
SDA
AS
2
Latch
3
4
I
2
C – BUS
interface
Shift register
Latch
Phase
detector
Current
sources
Status
14
15
13
12
AMOSC
Preamplifier
AM / FM–
switch
N – Divider
Analog
outputs
16
PDFM
PDAM
PDFMO
PDAMO
Oscillator
R – Divider
5
SWO1 SWO2 SWO3 AM/FM
6
7
8
9
Switching outputs
10
FMOSC
Preamplifier : 2
11
GND2
1
V
DD
20
GND1
Lock
detector
17
LD
13346
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 10-Apr-97
1 (9)
Preliminary Information
Related PDFs
| Model | Description | Manufacturer | Operation |
|---|---|---|---|
 U4280BM-B
|
AM / FM - PLL | TEMIC | Preview |
|
U4280BM-BFL
|
AM / FM - PLL | TEMIC | Preview |
|
U4280BM-FL
|
Phase Locked Loop, PDSO20, SO-20 | TEMIC | Preview |
