U4289BM-MFPG3
| Model | U4289BM-MFPG3 |
| Description | AM/FM PLL with 1 Switch |
| PDF file | Total 10 pages (File size: 157K) |
| Chip Manufacturer | ATMEL |
Features
•
Reference Oscillator up to 15 MHz
•
Two Programmable 16-bit Dividers Adjustable from 2 to 65535
•
Fine Tuning Steps
– AM
≥
1 kHz
– FM
≥
2 kHz
•
Loop-push-pull Stage for AM/FM
•
High Signal/Noise Ratio
AM/FM PLL
with 1 Switch
Description
The U4289BM is an integrated circuit in BICMOS technology for frequency synthesiz-
ers. It performs all the functions of a PLL radio tuning system and is controlled by a
2-wire bus. The device is designed for all frequency synthesizer applications in radio
receivers, as well as for RDS (Radio Data System) applications.
U4289BM
Figure 1.
Block Diagram
14
Oscillator
OSCOUT
SCL
SDA
AS
15
2
3
4
Phase
detector
I
2
C bus
interface
Current
sources
9
10
N-divider
1
VDD
16
GND1
12
13
PDAMO
VA
R-divider
Switching
output
OSCIN
5
11
SWO1
PDAM
FMOSC
6
PDFMO
AMOSC
8
AM/FM
switch
7
GND2
PDFM
Rev. 4757A–AUDR–10/03
