Atmel ATA5428 UHF ASK/FSK Transceiver DATASHEET Features Multi channel half-duplex transceiver with approximately 2.5MHz programmable tuning range High FSK sensitivity: 106dBm at 20Kbit/s/109.5dBm at 2.4Kbit/s (433.92MHz) High ASK sensitivity: 112.5dBm at 10Kbit/s/116.5dBm at 2.4Kbit/s (433.92MHz) Low supply current: 10.5mA in RX and TX Mode (3V/TX with 5dBm) Data Rate: 1 to 20Kbit/s Manchester FSK, 1 to 10Kbit/s Manchester ASK ASK/FSK receiver uses a low-IF architecture with high selectivity, blocking, and low intermodulation (typical blocking 55dB at 750kHz/61dB at 1.5MHz and 70dB at 10MHz, system I1dBCP = 30dBm/system IIP3 = 20dBm) 226kHz/237kHz IF frequency with 30dB image rejection and 170kHz usable IF bandwidth Transmitter uses closed loop fractional-N synthesizer for FSK modulation with a high PLL bandwidth and an excellent isolation between PLL/VCO and PA Tolerances of XTAL compensated by fractional-N synthesizer with 800Hz RF resolution Integrated RX/TX-switch, single-ended RF input and output RSSI (Received Signal Strength Indicator) Communication to microcontroller with SPI interface working at max.500kBit/s Configurable self polling and RX/TX protocol handling with FIFO-RAM buffering of received and transmitted data Five push button inputs and one wake-up input are active in power-down mode integrated XTAL capacitors PA efficiency: up to 38% (433.92MHz/10dBm/3V) Low in-band sensitivity change of typically 1.8dB within 58kHz center frequency change in the complete temperature and supply voltage range Supply voltage switch, supply voltage regulator, reset generation, clock/interrupt generation and low battery indicator for microcontroller 4841EWIRE03/12 Fully integrated PLL with low phase noise VCO, PLL loop filter and full support of multi-channel operation with arbitrary channel distance due to fractional-N synthesizer Sophisticated threshold control and quasi-peak detector circuit in the data slicer Power management via different operation modes 433.92MHz and 868.3MHz without external VCO and PLL components Inductive supply with voltage regulator if battery is empty (AUX mode) Efficient XTO start-up circuit (> 1.5k worst case real start-up impedance) Changing of modulation type ASK/FSK and data rate without component changes Minimal external circuitry requirements for complete system solution Adjustable output power: 0 to 10dBm adjusted and stabilized with external resistor ESD protection at all pins (1.5kV HBM, 200V MM, 1kV FCDM) Supply voltage range: 2.4V to 3.6V or 4.4V to 6.6V Temperature range: 40C to +85C Small 7 7mm QFN48 package Applications Consumer industrial segment Access control systems Remote control systems Alarm and telemetry systems Energy metering Home automation Benefits Low system cost due to very high system integration level Only one crystal needed in system Less demanding specification for the microcontroller due to handling of power-down mode, delivering of clock, reset, low battery indication and complete handling of receive/transmit protocol and polling Single-ended design with high isolation of PLL/VCO from PA and the power supply allows a loop antenna in the remote control unit to surround the whole application Atmel ATA5428 DATASHEET 2 4841EWIRE03/12