Wave Issue 2005 1/31/00 Article 4-01

***Infineon Technologies Announces Short-Range Crystal-Controlled
RF Transmitter and Receiver for Remote Control of Low-Cost,
Auto/HomeApplications
(January 28)

As an alternative to discrete SAW- (Surface Acoustic Wave) based
systems for short-range transceiver systems, Infineon
Technologies announced a crystal-controlled RF transmitter and
receiver chipset that combines integration, universal
applicability, high efficiency and value pricing. The RF ICs
apply HF PLL (high-frequency, phase-locked loop) principles to
achieve a frequency stability that is 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
chipset also meets the needs of a 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 U.S. 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 transmitter 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 2.1V to 4V, the TDA
5100 is suited for use with a single 3.6V 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
(voltage control oscillator) 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 5V +/- 10 percent with a low supply current of
4.7mA. Both the receiver and the transmitter include a power down
mode that limits consumption to 50nA.

The TDA 5100 is available in a standard TSSOP-16 plastic package
for PCB mounting and the TDA 5200 is offered in a TSSOP 28-pin
plastic package. In 50K production quantities of the TDA 5100
transmitter is listed at $.85 and the TDA 5200 receiver at $1.50.
Sample quantities are also available on request.

www.infineon.com