AS3902 查看數據表（PDF） - austriamicrosystems AG

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AS3902

ISM 433 MHz ASK Transmitter

austriamicrosystems AG 

ISM 433 MHz ASK Transmitter – Preliminary Data Sheet

AS3902

NRES/PD

TXD

XTAL

CLK/NWUP

1

2 AS3902

3

4

8 VDD

7 ANT1

6 ANT2

5 GND

MSOP-8 (or SOIC-8)

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.

VDD

f =433.920 MHz

GND

5

ANT2

6

ANT1

7

VDD

8

Driving

Amplifier.

Synthesizer

VCO

Loop-

Filter

Divider

1/32

Phase

detector

XTAL

Oscillator

Clock

on/off

on/off

µC Interface +

Power up/down

CLK/NWUP

4

XTAL

3

TXD

2

13.560 MHz

XTAL

NRES/PD

1

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 fRF by a fix, 32 times, multiplication of the reference

XTAL frequency fXTAL.

1.2 Microprocessor Clock

The microprocessor clock frequency fCLK is generated by dividing the XTAL frequency fXTAL

by 4.

Rev. A7, December 2000

Page 3 of 14

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