TH71081 查看數據表（PDF） - Unspecified
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TH71081 Datasheet PDF : 6 Pages
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TH71081
868/915MHz ASK Transmitter / LO Source
Description
Features
The TH71081 ASK transmitter / LO
source IC is designed for applications
in the European 868MHz SRD band,
according to the EN 300 220 telecom-
munications standard. It can also be
used for any other system with carrier
frequencies ranging from 700 to 1000
MHz (e.g. for applications in the US
915MHz ISM band). The transmitter's
q fully integrated, PLL-stabilized
VCO
q ASK achieved by level controlling
of internal power amplifier
q FM possible with external varactor
diode
q wide power supply range from 2.0
to 5.5 V
q flexible frequency range from 700
to 1000 MHz
q high frequency stability
carrier frequency fc is determined by
the frequency of the reference crystal
fref that is used. The integrated PLL
synthesizer ensures that each RF
value, ranging from 700 to 1000 MHz,
can be achieved by using a crystal with
reference frequency according to: fref =
fc/N, where N = 32 is the PLL feedback
divider ratio.
q adjustable output power range
from -12 to +3 dBm
q adjustable current consumption
from 6 to 12.5 mA
q very low standby current
q differential output well-suited for
loop antenna
q conforms to EN 300 220 standard
q cost-effective package SOP8
Applications
q keyless car security and central
locking
q low power telemetry
q alarm systems
q general digital data transmission
q general analog audio signal trans-
mission
q local oscillator signal generation
Block Diagram with
External Compo-
nents
Fig. 1: TH71081 block diagram
VCC 5
PS/DATA 4
RO
Cx1 2
XTAL
XOSC
div32
PFD
charge
pump
VCC
PA
VCO
mode
control
OUT1
7
OUT2
6
ENTX
3
VCC
1
LF
Cf2
8 VEE
Cf1 Rf1
Rev. 1.0
March 2000
Preliminary Datasheet
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