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參數(shù)資料
| 型號： | AS3902 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | ISM 433 MHz ASK Transmitter |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 348K |
| 代理商： | AS3902 |
ISM 433 MHz ASK Transmitter – Preliminary Data Sheet
AS3902
Rev. A7, December 2000
Page 4 of 14
1.3 Modulation
ASK modulation with a data rate from 0 up to 32 kbit/s (for continuous 101010… modulation
pattern) is done by turning the synthesizer and the driving amplifier on and off, whereas a TXD
= “H“ means a turned on state.
When TXD = “H“, at first the synthesizer is turned on. The following turning on of the driving
amplifier is internally delayed for t
DRON
of 21 μs (=72 clock pulses of the μC clock) to allow the
synthesizer to lock and settle its frequency prior to transmitting. When TXD becomes “L“, both,
synthesizer and driving amplifier are turned off to save power. In this case the synthesizer turn
off is delayed for 21 μs.
1.4 Driving Amplifier
The driving amplifier has a differential open collector output optimized for driving of small,
symmetrical high-impedance loop antennas. The amplifier drives a nominal RF current of
0.7 mA
rms
. The maximal differential voltage swing is about 4 V
PP
(1.4 V
RMS
). Therefore the out-
put power is a function of the connected load impedance. With a 2 k
differential load a nomi-
nal output power (to the antenna) of
≈
1 mW is obtained. Please note that the finally radiated
power (from antenna) is lower and strongly dependent on the efficiency (function of the size)
of the antenna to be used.
1.5 μC Interface and Power Management
The AS3902 contains a direct interface to a microcontroller (
μ
C). The μC interface of the
AS3902 consists of the following three pins:
“Transmit data input“ (TXD).
“Active “L“ μC reset output/transmitter power down input“ (NRES/PD).
“μC clock output/active “L“ wake-up input“ (CLK/NWUP).
These lines support the μC with the required reset and clock signals and control the AS3902
internal power on/off circuit which wakes up and shuts down the whole transmitter consisting
of the AS3902 and the μC.
Figure 2 shows a typical interconnection of the AS3902 with a typical μC. Figure 3 presents a
related timing for power up and down of the transmitter.
P1 SERIAL DATA OUT
P2 END TRANSMIT
NRESET
CLOCK
CLK/NWUP
TXD
NRES/PD
10k
uC
10k
Transmit
switch
SW
I
O
O
I/O
I/O
I
I
Figure 2:
Interconnection of the AS3902 with a typical μC.
Note:
At room temperature, resistor values of
≈
10 k
are suggested for the μC interface.
For other temperatures to be calculated from figure 6.
AS3902
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