U4289BM Datasheet, PDF (2/10 Pages) List of Unclassifed Manufacturers – AM / FM - PLL

U4289BM
Pin Description
V_DD
1
SCL
2
16 GND1
15 OSCOUT
SDA
3
14 OSCIN
AS
4
13 ^VA
SWO1 ₅
FMOSC 6
GND 2 7
12 ^PDAMO
11 ^PDAM
9 ^PDFM
AMOSC 8
10 ^PDFMO
95 10823
Pin Symbol
Function
1
V_DD Supply voltage
2
SCL I²C bus clock
3
SDA I²C bus data
4
AS Address selection
5
SWO1 Switching output
6 FMOSC FM oscillator input
7 GND 2 Ground 2 (analogue)
8 AMOSC AM oscillator input
9 PDFMO FM analogue output
10 PDFM FM current output
11 PDAM AM current output
12 PDAMO AM analogue output
13
VA Analogue supply voltage
14 OSCIN Oscillator input
15 OSCOUT Oscillator output
16 GND1 Ground 1 (digital)
Functional Description
The U4289BM is controlled via the 2-wire I²C bus. For
programming there are one module address byte, two sub-
address 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 U4289BM 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 trans-
mitted, 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 U4289BM has two separate inputs
for AM and FM oscillator. Pre-amplified AM and FM sig-
nals are fed to the 16 bit N-divider via AM/FM switch.
AM/FM switch is controlled by software. Tuning steps
can be selected by 16 bit R-divider. Further there is a digi-
tal memory phase detector. There are two separate current
sources for AM and FM amplifier (charge pump) as given
in electrical characterisitics. It allows independent ad-
justment of gain, whereby providing high current for high
speed tuning and low current for stable tuning.
2 (10)
TELEFUNKEN Semiconductors
Rev. A2, 14-May-97