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ATA5823 Dataheets PDF



Part Number ATA5823
Manufacturers ATMEL Corporation
Logo ATMEL Corporation
Description (ATA5823 / ATA5824) UHF ASK/FSK Transceiver
Datasheet ATA5823 DatasheetATA5823 Datasheet (PDF)

www.DataSheet4U.com Features • Full-duplex Operation Mode without Duplex Frequency Offset to Prevent the Relay • • • • • Attack against Passive Entry Go (PEG) Systems High FSK Sensitivity: –105.5 dBm at 20 kBaud/–109 dBm at 2.4 kBaud (433.92 MHz) High ASK Sensitivity: –111.5 dBm at 10 kBaud/–116 dBm at 2.4 kBaud (100% ASK, Carrier Level 433.92 MHz) Low Supply Current: 10.5 mA in RX and TX Mode (3V/TX with 5 dBm/433.92 MHz) Data Rate 1 to 20 kBaud Manchester FSK, 1 to 10 kBaud Manchester ASK ASK.

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www.DataSheet4U.com Features • Full-duplex Operation Mode without Duplex Frequency Offset to Prevent the Relay • • • • • Attack against Passive Entry Go (PEG) Systems High FSK Sensitivity: –105.5 dBm at 20 kBaud/–109 dBm at 2.4 kBaud (433.92 MHz) High ASK Sensitivity: –111.5 dBm at 10 kBaud/–116 dBm at 2.4 kBaud (100% ASK, Carrier Level 433.92 MHz) Low Supply Current: 10.5 mA in RX and TX Mode (3V/TX with 5 dBm/433.92 MHz) 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 3 dB Blocking 55.5 dBC at ±750 kHz/60.5 dBC at ±1.5 MHz and 67 dBC at ±10 MHz, System I1dBCP = –30 dBm/System IIP3 = –20 dBm) Wide Bandwidth AGC to Handle Large Outband Blockers above the System I1dBCP 226 kHz IF (Intermediate Frequency) with 30 dB Image Rejection and 220 kHz System Bandwidth to Support TPM Transmitters using ATA5756/ATA5757 Transmitters with Standard Crystals Transmitter Uses Closed Loop FSK Modulation with Fractional-N Synthesizer with 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 500 kBit/s Maximum Configurable Self Polling and RX/TX Protocol Handling with FIFO-RAM Buffering of Received and Transmitted Data 1 Push Button Input and 1 Wake-up Input are Active in Power-down Mode Integrated XTAL Capacitors PA Efficiency: up to 38% (433.92 MHz/10 dBm/3V) Low In-band Sensitivity Change of Typically ±2.0 dB within ±75 kHz Center Frequency Change in the Complete Temperature and Supply Voltage Range 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 433.92 MHz, 868.3 MHz and 315 MHz without External VCO and PLL Components Efficient XTO Start-up Circuit (> –1.5 kΩ Worst Case Start Impedance) Changing of Modulation Type ASK/FSK and Data Rate without Component Changes to Allow Different Modulation Schemes in TPM and RKE Minimal External Circuitry Requirements for Complete System Solution Adjustable Output Power: 0 to 10 dBm Adjusted and Stabilized with External Resistor, Programmable Output Power with 0.5dB Steps with Internal Resistor Clock and Interrupt Generation for Microcontroller ESD Protection at all Pins (±2.5 kV HBM, ±200V MM, ±500V FCDM) Supply Voltage Range: 2.15V to 3.6V or 4.4V to 5.25V Typical Power-down Current < 10 nA Temperature Range: –40°C to +105°C Small 7 mm × 7 mm QFN48 Package UHF ASK/FSK Transceiver ATA5823 ATA5824 • • • • • • • • • • • • • • • • • • • • • • • • • Rev. 4829C–RKE–09/05 Applications • • • • • • Automotive Keyless Entry and Passive Entry Go (Handsfree Car Access) Tire Pressure Monitoring Systems Remote Control Systems Alarm and Telemetering Systems Energy Metering Home Automation Benefits • • • • 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 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 Key Fob to Surround the Whole Application • Prevention against Relay Attack with Full-duplex Operation Mode • Integration of Tire Pressure Monitoring, Passive Entry and Remote Keyless Entry 1. General Description The ATA5823/ATA5824 is a highly integrated UHF ASK/FSK multi-channel half-duplex and full-duplex transceiver with low power consumption supplied in a small 7 mm × 7 mm QFN48 package. The receive part is built as a fully integrated low-IF receiver, whereas direct PLL modulation with the fractional-N synthesizer is used for FSK transmission and switching of the power amplifier for ASK transmission. The additional full-duplex mode makes relay attacks much more difficult, since the attacker has to receive and transmit signals on the same frequency at the same time. The device supports data rates of 1 kBaud to 20 kBaud (FSK) and 1 kBaud to 10 kBaud (ASK) in Manchester, Bi-phase and other codes in transparent mode. The ATA5824 can be used in the 433 MHz to 435 MHz band and the 867 MHz to 870 MHz band, the ATA5823 in the 313 MHz to 316 MHz band. The very high system integration level results in few numbers of external components needed. Due to its blocking and selectivity performance, together with a typical narrow-band key-fob loop antenna with 15 dB to 20 dB loss, a bulky blocking SAW is not needed in the key fob application. Additionally, the building blocks nee.


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