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ATA5812 Datasheet

  • ATA5812

  • UHF ASK/FSK TRANSCEIVER

  • 1075.77KB

  • 90頁

  • ATMEL   ATMEL

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Features
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High FSK Sensitivity: -106 dBm at 20 kBaud/-109.5 dBm at 2.4 kBaud (433.92 MHz)
High ASK Sensitivity: -112.5 dBm at 10 kBaud/-116.5 dBm at 2.4 kBaud (433.92 MHz)
Low Supply Current: 10.5 mA in RX and TX Mode (3 V/TX with 5 dBm)
Data Rate 1 to 20 kBaud Manchester FSK, 1 to 10 kBaud Manchester ASK
ASK/FSK Receiver Uses a Low-IF Architecture with High Selectivity, Blocking and Low
Intermodulation (Typical Blocking 55 dB at
鹵750
kHz/61 dB at
鹵1.5
MHz and
70 dB at
鹵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
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
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/3 V)
Low Inband Sensitivity Change of Typically 鹵1.8 dB within 鹵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 k鈩?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: 2.4 V to 3.6 V or 4.4 V to 6.6 V
Temperature Range: -40擄C to +105擄C
Small 7
脳
7 mm QFN48 Package
UHF ASK/FSK
Transceiver
ATA5811
ATA5812
Preliminary
Applications
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Automotive Keyless Entry and Passive Entry Go Systems
Access Control Systems
Remote Control Systems
Alarm and Telemetry Systems
Energy Metering
Home Automation
Benefits
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No SAW Device Needed in Key Fob Designs to Meet Automotive Specifications
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
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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
Rev. 4689B鈥揜KE鈥?4/04

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