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TH7108
(Rev.:2001)

868/915MHz FSK/FM/ASK Transmitter

Melexis Microelectronic Systems  

TH7108

868/915MHz

FSK/FM/ASK Transmitter

AC Characteristics

all parameters under normal operating conditions, unless otherwise stated;

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

ENCK = 1, ENTX = 1, RPS = 56 kΩ, fc = 868.3 MHz, test circuit shown in Fig. 2

Parameter

Symbol

Condition

Min

Typ

Output power

FSK deviation

Po

-1

∆fFSK depends on CX1, CX2

±5

±30

and crystal parameter

Data rate FSK

FM deviation

Modulation frequency FM

Data rate ASK

Reference spurs

Clock spurs

Harmonic content

Spurious output signal

Phase noise

VCO gain

Charge pump current

Clock voltage swing

Start-up time

RFSK

∆fFM

fmod

RASK

Pref

Pclk

Pharm

Poff

PN

KVCO

ICP

VCKOUT

ton

NRZ

adjustable with

varactor and VFM

NRZ

@ fc ± fref

@ fc ± fclk

@ 2fc , 3fc , 4fc

VPS ≤ 0.1V

@ fc ± 500kHz

Cload = 5pF

from ”all OFF” to any

other mode

20

±6

5

40

-44

-44

-40

-60

-87

300

±260

2

Max

±100

0.9

Unit

dBm

kHz

kbit/s

kHz

kHz

kbit/s

dBm

dBm

dBm

dBm

dBc/Hz

MHz/V

µA

Vpp

ms

Output Power Selection

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

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

RPS / kΩ

≥ 68

56

47

VPS/ V

Icc / mA

Po / dBm

Pharm / dBm

≥2

12.5

1

≤-40

1.2

9.5

-2

≤-40

0.9

8.5

-5

≤-40

39

0.7

7.8

-8

≤-45

27

0.5

7.0

-10

≤-45

15

0.3

6.2

-15

≤-50

Crystal Parameter

Parameter

Symbol

Condition

Min

Crystal frequency

fcrystal fundamental mode, AT

25

Load capacitance

Cload

10

Static capacitance

C0

Resonance resistance

Rm

Spurious response

aspur

3901007108

Rev. 005

Page 7 of 12

Max

Unit

29

MHz

15

pF

7

pF

40

Ω

-10

dB

Data Sheet

Dec. 2001

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