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TH71071

ETC
Part Number TH71071
Manufacturer ETC
Description 315/433MHz ASK Transmitter / LO Source
Published Apr 16, 2005
Detailed Description TH71071 315/433MHz ASK Transmitter / LO Source Features ! Fully integrated, PLL-stabilized VCO ! Flexible frequency rang...
Datasheet PDF File TH71071 PDF File

TH71071
TH71071

Overview
TH71071 315/433MHz ASK Transmitter / LO Source Features ! Fully integrated, PLL-stabilized VCO ! Flexible frequency range from 310 MHz to 450 MHz ! ASK achieved by on/off keying of internal power amplifier ! FM possible with external varactor ! Wide power supply range from 2.
2 V to 5.
5 V ! High over-all frequency accuracy ! Very low standby current ! Adjustable output power range from -12 dBm to +2 dBm ! Adjustable current consumption from 4.
8 mA to 11.
5 mA ! Differential output well-suited for loop antenna ! Conforms to EN 300 220 and similar standard Ordering Information Part No.
TH71071 Temperature Range -40 C° to 85 °C Package SOIC8 Application Examples ! ! ! ! ! ! Keyless car and central locking Low-power telemetry Alarm and security systems General digital data transmission General analog audio signal transmission Local oscillator signal generation Pin Description LF 1 RO 2 ENTX 3 PS/DATA 4 TH71071 8 VEE 7 OUT1 6 OUT2 5 VCC 3901071071 Rev.
004 Page 1 of 10 Data Sheet Dec.
2001 TH71071 315/433MHz ASK Transmitter / LO Source General Description The TH71071 ASK transmitter IC is designed for applications in the European 433MHz industrialscientific-medical (ISM) band, according to the EN 300 220 telecommunications standard.
It can also be used for any other system with carrier frequencies ranging from 310 MHz to 450 MHz (e.
g.
for applications in the US 315MHz ISM band).
The transmitter's 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 310 MHz to 450 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.
Theory of Operation General As depicted in Fig.
1, the TH71071 transmitter consists of a fully integrated voltage-controlled oscillator (VCO), a divide-by-32 divider (div32), a phase-frequency detector (PFD) and a charge pump.
An external loop filter at pin...


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