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General Description

The TDK 5111 is a single chip ASK/FSK transmitter for the frequency band 314-317 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 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 typically 10 dBm @ 3 V

■ frequency range 314-317 MHz

■ ASK/FSK modulation

■ low supply current typ. 13 mA@3V

■ voltage supply range 2.1 - 4 V

■ power down mode

■ low voltage sensor

■ programmable divided clock output for μC

■ low external component count

Applications

■ Keyless entry systems

■ Remote control systems

■ Alarm systems

■ Communication systems