TH7108 データシートの表示（PDF） - Unspecified

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TH7108

868/915MHz FSK/ASK/FM Transmitter

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TH7108

868/915MHz FSK/ASK/FM Transmitter

Description

Features

The TH7108 FSK/ASK/FM transmitter

IC is designed for applications in the

European 868MHz short range devices

(SRD) band, according to the EN 300

220 telecommunications standard. It

can also be used for any other system

with carrier frequencies ranging from

700 to 1000 MHz (e.g. for applications

in the US 915MHz ISM band). The

transmitter's carrier frequency fc is

determined by the frequency of the

reference crystal fref that is used. The

integrated PLL synthesizer ensures

that each RF value, ranging from 700

to 1000 MHz, can be achieved by us-

ing a crystal with reference frequency

according to: fref = fc/N, where N = 32 is

the PLL feedback divider ratio.

q fully integrated, PLL-stabilized

VCO

q FSK through crystal pulling allows

modulation from DC to 20 kbit/s

q high deviation possible for

wideband data transmission

q ASK achieved by on/off keying of in-

ternal power amplifier

q FM possible with external varactor

q wide power supply range from 2.1

to 5.5 V

q flexible frequency range from 700

to 1000 MHz

q high over-all frequency accuracy

q adjustable output power range

from -12 to +3 dBm

q adjustable current consumption

from 6 to 12.5 mA

q deviation and center frequency

independently adjustable

q very low standby current

q differential output well-suited for

loop antenna

q external clock available for µC

drive, down to 1.9 V supply

q ”clock only”mode

q conforms to EN 300 220 standard

Applications

Block Diagram with

External Compo-

nents

q keyless car security and central

locking

q low power telemetry

q alarm systems

q general digital data transmission

q general analog audio signal trans-

mission

Fig. 1: TH7108 block diagram

VCC 10

VCC 15

PS 9

CKOUT

8

RO1

5

XTAL

RO2

Cx2

4

Cx1 DATA

3

div 8

data /IP

XOSC

FSK

div32

PFD

charge

pump

PA

VCO

mode

control

1 LF1

Cf1

Rf1

16 LF2

Cf2

2 SUB

VEE

14

OUT1

13

OUT2

12

VEE

11

ENCK

7

ENTX

6

VCC

Rev. 2.0

February 2000

Preliminary Datasheet

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