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參數資料
| 型號： | U4285BM-AFSG3 |
| 英文描述： | AM / FM - PLL |
| 中文描述： | 調幅/調頻-鎖相環 |
| 文件頁數： | 2/10頁 |
| 文件大小： | 138K |
| 代理商： | U4285BM-AFSG3 |
U4285BM
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
2 (10)
Pin Description
1
2
3
4
5
6
7
8
13
14
15
16
17
18
19
20
U4285BM
SCL
SDA
AS
SWO 1
SWO 2
SWO3
SWO4
GND1
OSCOUT
OSCIN
C
VA
PDAMO
PDAM
PDFM
V
DD
9
11
12
FMOSC
GND 2
PDFMO
AMOSC
10
95 10121
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
V
DD
SCL
SDA
AS
SWO 1
SWO 2
SWO3
SWO4
FMOSC
GND 2
AMOSC
PDFMO
PDFM
PDAM
PDAMO
VA
C
OSCIN
OSCOUT Oscillator output
GND1
Ground 1 (digital)
Function
Supply voltage
I
2
C bus clock
I
2
C bus data
Address selection
Switching output 1
Switching output 2
Switching output 3
Switching output 4
FM oscillator input
Ground 2 (analog)
AM oscillator input
FM analogue output
FM current output
AM current output
AM analogue output
Analogue supply voltage
Capacitor
Oscillator input
Functional Description
The U4285BM is controlled via the 2-wire I
2
C 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 U4285BM 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 I
2
C bus begins with the
“START”- condition and has to be ended by the “STOP”-
condition (see figure 3).
The integrated circuit U4285BM has two separate inputs
for AM and FM oscillator. Pre-amplified AM and FM
signals 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
digital memory phase detector. There are two separate
current sources for AM and FM amplifier (charge pump)
as given in electrical characterisitics. It allows indepen-
dent adjustment of gain, whereby providing high current
for high speed tuning and low current for stable tuning.
相關PDF資料 |
PDF描述 |
|---|---|
| U4285BM | AM / FM - PLL |
| U4285BM-BFP | Consumer IC |
| U4285BM-BFS | Consumer IC |
| U4286BM-BFP | AM / FM-PLL |
| U4286BM-BFPG3 | AM / FM-PLL |
相關代理商/技術參數 |
參數描述 |
|---|---|
| U4285BM-BFP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| U4285BM-BFS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| U4285BM-MFS | 功能描述:IC PLL AM/FM W/4 SWITCHES 20SSOP RoHS:否 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標準包裝:100 系列:* |
| U4285BM-MFSG3 | 功能描述:IC PLL AM/FM W/4 SWITCHES 20SSOP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標準包裝:100 系列:* |
| U4286BM | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:AM / FM-PLL |
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