U4280BM Datasheet, PDF (2/9 Pages) TEMIC Semiconductors – AM / FM - PLL

U4280BM
Pin Description
V_DD 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
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Figure 2. Pinning
Pin Symbol
Function
1
V_DD 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.
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TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 10-Apr-97