U4286BM Datasheet, PDF (2/9 Pages) TEMIC Semiconductors – AM / FM-PLL

U4286BM
TELEFUNKEN Semiconductors
Pin Description
V_DD
1
SCL
2
16 ^GND
15 OSCOUT
SDA
3
14 OSCIN
AS
SWO 1
4
13 PDAMO
U 4286 BM
5
12 PDAM
SWO 2 ₆
11 PDFM
FMOSC 7
10 PDFMO
GND 2 8
9 AMOSC
Pin Symbol
Function
1
V_DD Supply voltage
2
SCL I²C bus clock
3
SDA I²C bus data
4
AS Address selection
5 SWO 1 Switching output 1
6 SWO 2 Switching output 2
7 FMOSC FM oscillator input
8 GND 2 Ground 2 (analog)
9 AMOSC AM oscillator input
10 PDFMO FM analogue output
11 PDFM FM current output
12 PDAM AM current output
13 PDAMO AM analogue output
14 OSCIN Oscillator input
15 OSCOUT Oscillator output
16 GND 1 Ground 1 (digital)
94 7908 e
Functional Description
The U4286BM 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 U4286BM-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 U4286BM 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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Preliminary Information
Rev. A1: 19.08.1996