Overview
The TDK 5111 F is a single chip ASK/FSK transmitter for operation in 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 10 dBm)
• low supply current
• 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

Application
• Tire pressure monitoring systems
• Keyless entry systems
• Remote control systems
• Alarm systems
• Communication systems