PTC PT4305-X

The PT4305 is a PLL-tuned FSK receiver for short-range wireless data applications in the 315 MHz and 434 MHz frequency bands. The PT4305 offers a high level of integration and only requires few external components. The PT4305’s receive section includes a low-noise amplifier, image-reject mixer, IF band-pass filter, limiting amplifier, and frequency-shift keying (FSK) demodulator and also includes automatic gain control (AGC). A switched-capacitor data filter further filters the signal after the demodulator before a slicing comparator restores the data to full-swing CMOS logic levels. The local oscillator sub-system consists of a phase-locked loop (PLL) based on a crystal oscillator reference. The receiver channel frequency is determined by the choice of the crystal frequency. A built-in voltage regulator provides improved power supply rejection (PSR) and extends the supply voltage range from 2.4 V to 5.5 V. The PT4305 is available in a 16-pin SSOP package and its operation is specified over the temperature range from -40 to +85 °C.

• Supply voltage range: 2.4 V to 5.5 V
• Low current consumption: 5.4 mA (typical) at 433.92 MHz
• Supported data rate range: 1 Kb/s to 10 Kb/s
• Few external components
• Image-reject mixer
• On-chip auto-tuned channel-select band-pass filter
• Received signal strength indicator (RSSI)
• Leader-code detection
• 16-pin SSOP package

• Remote keyless entry (RKE) systems
• Remote control
• Home security and alarm
• Wireless toy control
• Personal/patient data logging
• Remote automatic meter reading