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U4280 반도체 회로 부품 판매점

AM / FM - PLL



TEMIC Semiconductors 로고
TEMIC Semiconductors
U4280 데이터시트, 핀배열, 회로
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)


U4280 데이터시트, 핀배열, 회로
U4280BM
Pin Description
VDD 1
SCL 2
SDA 3
AS 4
PRT 5
SWO1 6
20 GND1
19 OSCOUT
18 OSCIN
17 LD
16 PDAMO
15 PDAM
SWO2 7
14 PDFM
SWO3 8
AM/FM 9
13 PDFMO
12 AMOSC
FMOSC 10
11 GND
13319
Figure 2. Pinning
Pin Symbol
Function
1 VDD Supply voltage
2 SCL I2C bus clock
3 SDA I2C bus data
4 AS Address selection
5 PRT Switching port
6 SWO1 Switching output 1
7 SWO2 Switching output 2
8 SWO3 Switching output 3
9 AM/FM Switching output AM/FM
10 FMOSC FM oscillator input
11 GND2 Ground 2 (analog)
12 AMOSC AM oscillator input
13 PDFMO FM analog output
14 PDFM FM current output
15 PDAM AM current output
16 PDAMO AM analog output
17 LD Lock detect
18 OSCIN Oscillator input
19 OSCOUT Oscillator output
20 GND1 Ground 1 (digital)
Functional Description
The U4280BM is controlled via the 2-wire I2C bus. For
programming there are one module address byte, two
subaddress bytes and five data bytes.
The module address contains a programmable address bit
A 1 which with address select input AS (Pin 4) makes it
possible to operate two U4280BM-B in one system. If bit
A 1 is identical with the status of the address select input
AS, the chip is selected.
The subaddress determines which one of the data bytes is
transmitted first. If subaddress of R-divider is
transmitted, the sequence of the next data bytes is DB 0
(Status), DB 1 and DB 2.
If subaddress of N-divider is transmitted, the sequence of
the next data bytes is DB 3 and DB 4. The bit organisation
of the module address, subaddress and 5 data bytes are
shown in figure 2
Each transmission on the I2C bus begins with the
“START ”-condition and has to be ended by the “STOP”-
condition (see figure 3).
The integrated circuit U 4283 BM has two separate inputs
for AM and FM oscillator. Pre-amplified AM signal is
directed to the 16 bit N-divider via AM/FM switch,
whereas (pre-amplified) FM signal is first divided by a
fixed prescaler ( :2 ). AM/FM switch is controlled by
software. Tuning steps can be selected by 16 bit
R-divider. Further there is a digital memory phase
detector. There are two separate current sources for AM
and FM amplifier (charge pump) as given in electrical
characteristics. It allows independent adjustment of gain,
whereby providing high current for high speed tuning and
low current for stable tuning.
2 (9) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 10-Apr-97




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