Atmel ATA5811 Preliminary

Features
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Minimal External Circuitry Requirements for Complete System Solution
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Adjustable Output Power: 0 to 10 dBm Adjusted and Stabilized with External Resistor
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PA Efficiency: up to 38% (433 MHz/10 dBm/3 V)
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High FSK Sensitivity: -106 dBm at 20 kBaud/-109.5 dBm at 2.4 kBaud (433.92 MHz)
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High ASK Sensitivity: -112.5 dBm at 10 kBaud/-116.5 dBm at 2.4 kBaud
(Carrier Level 433.92 MHz)
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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)
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Transmitter Uses Closed Loop Fractional-N Synthesizer for FSK Modulation with a
High PLL Bandwidth and an Excellent Isolation between PLL and PA
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Tolerances of XTAL Compensated by Fractional-N Synthesizer with 800 Hz RF
Resolution
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Low Inband Sensitivity Change of Typically ±1.8 dB within ±58 kHz Center Frequency
Change in the Complete Temperature and Supply Voltage Range
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Supply Voltage Range: 2.4 V to 3.6 V or 4.4 V to 6.6 V
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Temperature Range: -40°C to +105°C
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Low Supply Current: 10.5 mA in RX and TX Mode (3 V/TX with 5 dBm)
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Supply Voltage Switch, Supply Voltage Regulator, Reset Generation, Clock/Interrupt
Generation and Low Battery Indicator for Microcontroller
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Integrated RX/TX-Switch, Single-ended RF Input and Output
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Fully Integrated PLL with Low Phase Noise VCO and PLL Loop Filter
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Sophisticated Threshold Control and Quasi Peak Detector Circuit in the Data Slicer
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Configurable Self Polling and RX/TX Protocol Handling with FIFO-RAM Buffering of
Received and Transmitted Data
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RSSI (Received Signal Strength Indicator)
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Communication to Microcontroller with SPI Interface Working at Maximum 500 kBit/s
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< 10 nA Typical System Power-down Current Including Microcontroller
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Power Management via Different Operation Modes
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5 Push Button Inputs and One Wake-up Input are Active in Power-down Mode
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ESD Protection at all Pins (2 kV HBM, 200 V MM)
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433.92 MHz, 868.3 MHz and 315 MHz without External VCO and PLL Components
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Inductive Supply with Voltage Regulator if Battery is Empty (AUX Mode)
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Efficient XTO Start-up Circuit (> -1.5 kW Worst Case Start Impedance)
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Integrated XTAL Capacitors
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226 kHz IF Frequency with 30 dB Image Rejection and 170 kHz Usable IF Bandwidth
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Changing of Modulation Type ASK/FSK and Data Rate without Component Changes
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Data Rate 1 to 20 kBaud Manchester FSK, 1 to 10 kBaud Manchester ASK
Small 7 ´ 7 mm QFN48 Package
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Applications
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Automotive Keyless Entry and Access Control Systems
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Remote Control Systems
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Alarm and Telemetry Systems
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Energy Metering
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Home Automation
Benefits
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No SAW Device Needed in Key Fob Designs to Meet Automotive Specifications
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Low System Cost Due to Very High System Integration Level
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Only One Crystal Needed in System
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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
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Single-ended Design with High Isolation of PLL/VCO from PA and the Power Supply
Allows a Loop Antenna in the Key Fob to Surround the Whole Application
UHF ASK/FSK
Transceiver
ATA5811
ATA5812
Preliminary
Rev. 4689A–RKE–05/03
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