The rfRXD0420/0920 is a single conversion superheterodyne receiver from Microchip Technology Inc. It has low cost, good compatibility, easy interface, and is suitable for wireless remote control and command, wireless security systems, wireless keyless entry systems and other applications.
The rfRXD0420/0920 series are low‑cost, compact UHF receivers that support ASK, FSK, and FM modulation. The rfRXD0420 covers 300 MHz‑450 MHz while the rfRXD0920 covers 800 MHz‑930 MHz, offering selectable LNA gain and IF bandwidth for flexible performance.
Key features include a phase‑locked loop synthesizer with crystal reference, a low‑noise amplifier with selectable gain, an IF limiting amplifier with RSSI output, and a quadrature demodulator for FSK/FM. The devices operate over a wide temperature range and consume low active current, making them suitable for remote control, security, and telemetry applications.
| Receive frequency range (rfRXD0920) | 800 MHz to 930 MHz |
|---|---|
| IF frequency range | 455 kHz to 21.4 MHz |
| RSSI range | 70 dB |
| Maximum data rate (ASK) | 80 Kbps NRZ |
| Maximum data rate (FSK) | 40 Kbps NRZ |
| Typical active current (rfRXD0420, LNA high‑gain) | 8.2 mA |
| Operating temperature range (Industrial) | 40°C to +85°C |
| VCO gain (rfRXD0420) | 250 MHz/V at 60 µA |
It draws about 8.2 mA in LNA high‑gain mode.
An external ceramic IF filter is used to select the IF bandwidth.