參數(shù)資料
型號： AS3902
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： 通信及網(wǎng)絡(luò)
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)： 3/14頁
文件大?。?/td> 348K
代理商： AS3902
ISM 433 MHz ASK Transmitter – Preliminary Data Sheet
AS3902
Rev. A7, December 2000
Page 3 of 14
MSOP-8 (or SOIC-8)
1
2
3
4
NRES/PD
TXD
XTAL
CLK/NWUP
ANT2
GND
ANT1
VDD
8
7
6
5
This document contains information on products under development. Austria Mikro Systeme
International AG reserves the right to change or discontinue this product without notice.
1
Functional Description
The AS3902 consists of a reference XTAL oscillator, a single channel RF- synthesizer, a driv-
ing amplifier and a μC interface, including microprocessor clock divider and a sophisticated
power up/down circuitry.
Driving
Amplifier.
13.560 MHz
XTAL
Loop-
Filter
Synthesizer
XTAL
Oscillator
VCO
on/off
μC Interface +
Power up/down
f =433.920 MHz
VDD
ANT1
ANT2
GND
5
6
7
8
VDD
NRES/PD
1
TXD
2
XTAL
3
CLK/NWUP
4
on/off
Clock
Divider
1/32
Phase
detector
Figure 1:
Block diagram of the AS3902.
1.1 RF Synthesizer
The RF synthesizer is a fully integrated single channel device with internal loop filter, generat-
ing the 433 MHz transmit carrier frequency f
RF
by a fix, 32 times, multiplication of the reference
XTAL frequency f
XTAL
.
1.2 Microprocessor Clock
The microprocessor clock frequency f
CLK
is generated by dividing the XTAL frequency f
XTAL
by 4.
AS3902
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