TH7108 datasheet(8/14 Pages) MELEXIS

8 / 14 page

TH7108

868/915MHz

FSK/FM/ASK Transmitter

3901007108

Page 8 of 14

Data Sheet

Rev. 008

May/03

4.4

DC Characteristics

all parameters under normal operating conditions, unless otherwise stated;

typical values at TA = 23 °C and VCC = 3 V

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Standby current

ISBY

ENCK=0, ENTX=0

0.05

0.1

µA

Clock only current

ICLK

ENCK=1, ENTX=0

0.7

0.9

1.6

Operating current

ICC

ENCK=x, ENTX=1,

RPS=56k

Ω

9.5

Input current

IIN

DATA=x, ENCK=0,

ENTX=0

-1

µA

Pull down current

IPD

ENCK=1, ENTX=1

µA

Pull up current

IPS

ENCK=1, ENTX=1

µA

MOS switch On resistance

RON

DATA=0, ENTX=1

Ω

4.5

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 k

Ω, f

c = 868.3 MHz, test circuit shown in Fig. 2

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Output power

-2

dBm

Reference spurs

Pref

@ fc

± f

ref

-44

dBm

Clock spurs

Pclk

@ fc

± f

clk

-44

dBm

Harmonic content

Pharm

@ 2fc , 3fc , 4fc

-40

dBm

Spurious output signal

Poff

VPS

≤ 0.1V

-60

dBm

Phase noise

@ fc

± 200kHz

-82

-78

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

1.0

1.2

4.6

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 / k

Ω

≥≥≥≥ 68

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

-10

-15

Pharm / dBm

≤-40

≤-45

≤-50

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