General Description
The TDK 5100 is a single chip ASK/FSK transmitter for the frequency bands 433-435 and 868-870 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 there fore 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 synthe sizer
■ VCO without external components
■ ASK and FSK modulation
■ switchable frequency range 433-435 MHz / 868-870 MHz
■ high efficiency power amplifier (typically 5 dBm / 2 dBm)
■ low supply current (typically 7mA)
■ voltage supply range 2.1 - 4 V
■ temperature range −40 ... +125°C
■ power down mode
■ low voltage sensor
■ selectable crystal oscillator 6.78 MHz / 13.56 MHz
■ programmable divided clock output for µC
■ low external component count

Applications
■ Keyless entry systems
■ Remote control systems
■ Alarm systems
■ Communication systems