TH7108 datasheet(7/10 Pages) ETC

7 / 10 page

TH71082

868/915MHz

ASK Transmitter / LO Source

TH71082 Data Sheet

Page 7 of 10

Dec. 2001

3901071082

Rev. 004

Test Circuit

Fig. 2: Test circuit for ASK

with 50

Ω matching network

Test circuit component list to Fig. 2

Part

Size

Value

Tolerance

Description

CF1

0603

4.7 nF

±10%

loop filter capacitor

CF2

0603

56 pF

±10%

loop filter capacitor

0603

100 pF

±10%

XOSC capacitor

0603

100 pF

±5%

impedance matching capacitor

0603

6.8 pF

±5%

impedance matching capacitor

0603

330 pF

±10%

blocking capacitor

0805

33 nF

±10%

blocking capacitor

0603

270 nH

±5%

impedance matching inductor

0603

12 nH

±5%

impedance matching inductor

RF1

0603

1 k

Ω±10%

loop filter resistor

0603

See output power

selection table

±10%

ASK power-select resistor, not requirement at CW mode

0603

See output power

selection table

±10%

ASK or CW mode power-select resistor

XTAL

HC49/S

27.1344 MHz

fundamental wave

±30ppm

calibration

±30ppm temp.

crystal, Cload = 12 pF to 15 pF, C0, max = 7 pF,

Rm, max = 40

Ω

XTAL

RF1

CF1

CF2

1 2

12 3

1 2

OUT

1 2

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