TH7108 datasheet(6/10 Pages) ETC

6 / 10 page

TH71082

868/915MHz

ASK Transmitter / LO Source

TH71082 Data Sheet

Page 6 of 10

Dec. 2001

3901071082

Rev. 004

AC Characteristics

all parameters under normal operating conditions, unless otherwise stated;

typical values at Ta = 23 °C and Vcc = 3 V;

ENTX = 1, VPS = 1.1V, fc = 868.3 MHz, test circuit shown in Fig. 2

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Output power

-4

dBm

FM deviation

∆f

adjustable with

varactor and VFM

±6

kHz

Modulation frequency FM

fmod

5kHz

Data rate ASK

RASK

kbit/s

Reference spurs

Pref

@ fc

± f

ref

-44

dBm

Harmonic content

Pharm

@ 2fc , 3fc , 4fc

-40

dBm

Spurious output signal

Poff

VPS

≤ 0.1V

-60

dBm

Phase noise

@ fc

± 500kHz

-87

dBc/Hz

VCO gain

KVCO

300

MHz/V

Charge pump current

ICP

±260

µA

Clock voltage swing

VCKOUT

Cload = 5pF

Vpp

Start-up time

ton

from ”all OFF” to any

other mode

0.9

Output Power Selection

typical values at Ta = 23 °C and Vcc = 3 V:

ENTX = 1, fc = 868.3 MHz, test circuit shown in Fig. 2

R1 / k

Ω

7.5

R2 / k

Ω

4.7

VPS / V

≥≥≥≥ 2

1.1

0.9

0.7

0.5

0.3

Icc / mA

12.5

9.5

8.5

7.8

7.0

6.2

Po / dBm

-2

-5

-8

-11

-15

-18

Pharm / dBm

≤-40

≤-45

≤-50

If the transmitter is operated at any supply voltage Vcc,

the values for R1 and R2 can be calculated as allows:









−

•

Crystal Parameter

Parameter

Symbol

Condition

Min

Max

Unit

Crystal frequency

fcrystal

fundamental mode, AT

MHz

Load capacitance

Cload

Static capacitance

7pF

Resonance resistance

Ω

Spurious response

aspur

-10

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