TH71082EDC 데이터 시트보기 (PDF) - Melexis Microelectronic Systems

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TH71082EDC

868/915MHz ASK Transmitter / LO Source

Melexis Microelectronic Systems  

TH71082

868/915MHz

ASK Transmitter / LO Source

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

Output power

FM deviation

Modulation frequency FM

Data rate ASK

Reference spurs

Harmonic content

Spurious output signal

Phase noise

VCO gain

Charge pump current

Clock voltage swing

Start-up time

Po

∆fFM

fmod

RASK

Pref

Pharm

Poff

PN

KVCO

ICP

VCKOUT

ton

adjustable with

varactor and VFM

@ fc ± fref

@ 2fc , 3fc , 4fc

VPS ≤ 0.1V

@ fc ± 500kHz

Cload = 5pF

from ”all OFF” to any

other mode

Typ

-4

±6

5

40

-44

-40

-60

-87

300

±260

2

Max

0.9

Unit

dBm

kHz

kHz

kbit/s

dBm

dBm

dBm

dBc/Hz

MHz/V

µA

Vpp

ms

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 / kΩ

0

7.5

11

R2 / kΩ

4.7

4.7

VPS / V

≥2

1.1

0.9

Icc / mA

Po / dBm

Pharm / dBm

12.5

-2

≤-40

9.5

-5

≤-40

8.5

-8

≤-40

15

4.7

0.7

7.8

-11

≤-45

24

4.7

0.5

7.0

-15

≤-45

If the transmitter is operated at any supply voltage Vcc,

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

R1

= R2

•



Vcc

VPS

− 1

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

Max

29

15

7

40

-10

43

4.7

0.3

6.2

-18

≤-50

Unit

MHz

pF

pF

Ω

dB

3901071082

Rev. 005

Page 6 of 10

Data Sheet

Jan. 2002

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