Features
• High FSK Sensitivity: –106 dBm at 20 Kbit/s/–109.5 dBm at 2.4 Kbit/s (433.92 MHz)
• High ASK Sensitivity: –112.5 dBm at 10 Kbit/s/–116.5 dBm at 2.4 Kbit/s (433.92 MHz)
• Low Supply Current: 10.5 mA in RX and TX Mode (3V/TX with 5 dBm)
• Data Rate 1 to 20 Kbit/s Manchester FSK, 1 to 10 Kbit/s Manchester ASK
• ASK/FSK Receiver Uses a Low-IF Architecture with High Selectivity, Blocking and Low
Intermodulation (Typical Blocking 55 dB at ±750 kHz/61 dB at ±1.5 MHz and
70 dB at ±10 MHz, System I1dBCP = –30 dBm/System IIP3 = –20 dBm)
• 226 kHz IF Frequency with 30 dB Image Rejection and 170 kHz Usable IF Bandwidth
• Transmitter Uses Closed Loop Fractional-N Synthesizer for FSK Modulation with a
High PLL Bandwidth and an Excellent Isolation between PLL and PA
• Tolerances of XTAL Compensated by Fractional-N Synthesizer with 800 Hz RF
Resolution
UHF ASK/FSK
Transceiver
• Integrated RX/TX-Switch, Single-ended RF Input and Output
• RSSI (Received Signal Strength Indicator)
• Communication to Microcontroller with SPI Interface Working at Maximum 500 kBit/s
• Configurable Self Polling and RX/TX Protocol Handling with FIFO-RAM Buffering of
Received and Transmitted Data
ATA5811
ATA5812
• 5 Push Button Inputs and One Wake-up Input are Active in Power-down Mode
• Integrated XTAL Capacitors
• PA Efficiency: up to 38% (433 MHz/10 dBm/3V)
• Low Inband Sensitivity Change of Typically ±1.8 dB within ±58 kHz 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
• Fully Integrated PLL with Low Phase Noise VCO and PLL Loop Filter
• Sophisticated Threshold Control and Quasi Peak Detector Circuit in the Data Slicer
• Power Management via Different Operation Modes
• 433.92 MHz, 868.3 MHz and 315 MHz without External VCO and PLL Components
• Inductive Supply with Voltage Regulator if Battery is Empty (AUX Mode)
• Efficient XTO Start-up Circuit (> –1.5 kΩ Worst Case Start 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 10 dBm Adjusted and Stabilized with External Resistor
• ESD Protection at all Pins (2 kV HBM, 200 V MM)
• Supply Voltage Range: 2.4V to 3.6V or 4.4V to 6.6V
• Temperature Range: –40°C to +105°C
• Small 7 × 7 mm QFN48 Package
4689F–RKE–08/06
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