The MTX-405 is a 290MHz-980MHz RF transmitter IC designed for unlicensed ISM band operations. It's designed to work in the North American 315MHz and 915MHz bands as well as the European 433MHz and 868MHz bands.
The transmitter consists of an FSK/ASK modulator, PLL frequency synthesizer and a power amplifier. The frequency synthesizer consists of a voltage controlled oscillator (VCO), a crystal oscillator, dual modulus prescaler, programmable frequency dividers and a phase-detector. The output power of the power amplifier can be programmed to eight levels. A lock detect circuit detects when the PLL is in lock.
In FSK mode, the user can select between three different modulation types allowing a data rate up to 200kbps. When selecting FSK modulation applied with dividers, the MTX-405 is switching between to sets of register values. The second modulation type is closed loop VCO modulation using the internal modulator that applies the modulated data to the VCO. The third FSK modulation type is Open loop VCO modulation.
In ASK modulation, the user can select between two modulation types, with or without spreading. In both modes the modulation depth is programmable.
Key Features
FSK/ASK transmitter Low cost Commonly employed RKE frequencies Wide operating temperature range Easily integrated Compact surface-mount packages/Small size Frequency Programmable ASK modulation depth programmable Power down pin No production tuning High efficiency power amplifier Programmable output power Base band package engine TX buffer No external tuning circuitry
Typical Applications
Meter reading Automotive Smart home Remote control systems Residential automation Wireless security system General wire elimination
Downloads Data Sheet - Full technical data for the MTX-405 transmitter module (pdf)
FSK/ASK transmitter
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