General Description
The TDK 5101 F is a single chip ASK/FSK transmitter for the frequency band 311-317 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. Additional features are a power down mode and a divided clock output.

FEATUREs
■ fully integrated frequency synthesizer
■ VCO without external components
■ ASK and FSK modulation
■ frequency range 311-317 MHz
■ high efficiency power amplifier (typically 5 dBm)
■ low supply current (typically 7mA)
■ voltage supply range 2.1 - 4 V
■ temperature range −40 ... +125°C
■ power down mode
■ crystal oscillator 9.84 MHz
■ FSK-switch
■ divided clock output for µC
■ low external component count

APPLICATIONs
■ Tire pressure monitoring systems
■ Keyless entry systems
■ Remote control systems
■ Alarm systems
■ Communication systems