TH71221 datasheet(30/44 Pages) MELEXIS

30 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 30 of 44

Data Sheet

Rev. 005

June/07

6.6

AC Characteristics of the Transmitter Part

all parameters under normal operating conditions, unless otherwise stated;

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

all parameters based on test circuits for FSK (Fig. 14 to 15) and ASK (Fig. 16 to 17), respectively;

Parameter

Symbol

Condition

Min

Typ

Max

Unit

fRF= 433.92MHz

-7

Output power

fRF= 868.3MHz

mode = transmit,

RPS = see para. 7.3

TXPOWER = 00

-10

dBm

fRF= 433.92MHz

Output power

fRF= 868.3MHz

mode = transmit,

RPS = see para. 7.3

TXPOWER = 01

-2

dBm

fRF= 433.92MHz

Output power

fRF= 868.3MHz

mode = transmit,

RPS = see para. 7.3

TXPOWER = 10

dBm

fRF= 433.92MHz

Output power

fRF= 868.3MHz

mode = transmit,

RPS = see para. 7.3

TXPOWER = 11

dBm

FSK deviation

ΔfFSK

depends on Cx1, Cx2

and crystal parameters

±2.5

±25

±80

kHz

FM deviation

ΔfFM

please refer to the FM

circuit in the cookbook

±6

kHz

Modulation frequency FM

fmod

kHz

PLL reference spurious emission

Pspur_PLL

-40

dBm

Harmonic emission

Pharm

-36

dBm

Start-up time

ton_TX

From standby to

transmit mode

1.5

6.7

Serial Control Interface

Parameter

Symbol

Condition

Min

Max

Unit

SDTA to SCLK set up time

tCS

150

SCLK to SDTA hold time

tCH

SCLK pulse width low

tCWL

100

SCLK pulse width high

tCWH

100

SCLK to SDEN set up time

tES

100

SDEN pulse width

tEW

100

SDEN to SCLK hold time

tEH

100

6.8

Crystal Parameters

Parameter

Symbol

Condition

Min

Max

Unit

Crystal frequency

fcrystal

fundamental mode, AT

MHz

Load capacitance

Cload

Static capacitance

Equivalent series resistance

180

Spurious response

aspur

only required for FSK

-10

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