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 Descriptio n

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

TXD

XTAL

CLK/NWUP

4

3

2

1

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-

1.2 Microprocessor Clock

by 4.

AS3902