General Description

The TDA 5102 is a single chip ASK/FSK transmitter for the frequency band 905-925 MHz. The IC offers a high level of integration and needs only a few external components. The device contains a fully integrated PLL synthesizer and a high efficiency power amplifier to drive a loop antenna. A special circuit design and an unique power amplifier design are used to save current consumption and therefore to save battery life. Additionally features like a power down mode, a low power detect, a selectable crystal oscillator frequency and a divided clock output are implemented. The IC can be used for both ASK and FSK modulation.

Features

■ fully integrated frequency synthesizer

■ VCO without external components

■ high efficiency power amplifier

■ frequency range 905-925 MHz

■ ASK/FSK modulation

■ low supply current (typically 7mA)

■ voltage supply range 2.1 - 4 V

■ power down mode

■ low voltage sensor

■ selectable crystal oscillator 7.15 MHz/14.3 MHz

■ programmable divided clock output for µC

■ low external component count

Applications

■ Keyless entry systems

■ Remote control systems

■ Alarm systems

■ Communication systems