SAW-less short-range RF transmitter and reciever for car/home remote control applications
1 March 2000
Telecoms, Datacoms, Wireless, IoT
Siemnes Components
As an alternative to discrete SAW-based (Surface Acoustic Wave) systems for short-range transceiver systems, Infineon Technologies has developed a crystal-controlled RF transmitter and receiver chipset that combines maximum integration, universal applicability and high efficiency. The highly integrated RF ICs apply HF PLL (high-frequency, phase-locked loop) principles to achieve a frequency stability that is claimed to be 10 times better than SAW resonators, and at a lower cost. With improved frequency stability, the design enables the implementation of high-performance receiver/transmitter solutions that are highly interference tolerant.
Targeted for low-powered remote keyless entry (RKE) systems, the new chipset also meets the needs of a growing number of short-range, home-based radio RF applications including security, control, and detection. Industrial applications include alarm systems and lighting control.
Standard short-range devices are available from Infineon for both the European frequency bands of 868-870 MHz and 433-435 MHz (TDA 5100 transmitter and TDA 5200 receiver). For the US, Infineon offers the TDA 5101 and TDA 5201 at 315 and 345 MHz.
The transmitter, a single-chip ASK/FSK (amplitude shift keying/frequency shift keying) device, is crystal-controlled with an on-board filter to limit the number of external components. The TDA 5100 trans- mitter features a fully integrated VCO, a PLL synthesizer, a crystal oscillator with a divided clock output to drive a microcontroller and a power amplifier to drive a loop antenna. With a supply voltage range from 2,1 to 4 V, the TDA 5100 is suited for use with a single 3,6 V lithium-ion battery.
The receiver, TDA 5200, is a single-chip ASK super heterodyne (SHR) device that contains a low-noise amplifier (LNA) and a double-balanced mixer at the front end. An integrated VCO is included on the IC to provide the local oscillator signal for the mixer. A PLL synthesizer, a crystal oscillator, a limiter with RSSI generator, a data filter, a data comparator and a peak detector are also on the silicon. Power supply is 5 V ±10% with a low supply current of 4,7 mA. Both the receiver and the transmitter include a power down mode that limits consumption to 50 nA.
The TDA 5100 comes in a standard TSSOP-16 plastic package for PCB mounting and the TDA 5200 is offered in a TSSOP 28-pin plastic package.
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