浅谈ATA5830构成的低功耗UHF ASK（FSK）RF收发方案

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                    　　ATA5830是通用高度集成低功耗UHF ASK/FSK RF单片收发器，包括了RF部分，数字基带和AVR 微控制器内核，内核是采用增强RISC架构的低功耗CMOS 8位MCU.收发器工作在ISM频段，频率范围为310MHz- 318MHz, 418MHz-477MHz以及 836MHz - 928MHz,数据速率0.5k到20kBit/s Manchester,工作电压1.9V-3.6V和4.5V-5.5V,工作温度–40℃到+105℃，主要用在RKE,TPMS,遥控起动和控制系统，以及智能RF应用。
　　ATA5830主要特性：
　 ?Supported Data Rate 0.5k to 20kBit/s Manchester （Higher Data Rates in ransparent
　　Mode）
　　Programmable RX-IF Bandwidth 25kHz to 360kHz （Approx. 10% Increments）
　　Frequency Ranges 310MHz to 318MHz, 418MHz to 477MHz, and 836MHz to 928MHz
　　– 315.00MHz/433.92MHz/868.30MHz and 915.00MHz with 24.305MHz Crystal Freq.
　　Programmable Channel Frequency with Fractional PLL
　　– 92Hz Resolution for Low Band
　　– 184Hz Resolution for High Band
　　FSK Deviation ±0.375kHz to ±90kHz
　　FSK Sensitivity （Manchester） at 433.92MHz
　　– –106dBm at 20kBit/s, f = ±20kHz, IFBW = 165kHz
　　– –109dBm at 10kBit/s, f = ±10kHz, IFBW = 165kHz
　　– –111dBm at 5kBit/s, f = ±5kHz, IFBW = 165kHz
　　– –119dBm at 0.75kBit/s, f = ±0.75kHz, IFBW = 25kHz
　　ASK Sensitivity （Manchester） at 433.92MHz
　　– –108dBm at 20kBit/s, BW = 360kHz
　　– –116dBm at 1kBit/s, BW = 360kHz
　　Excellent Blocking （IFBW = 165kHz）： 64dBC at Freq. Offset = 1MHz and 50dBC at 25kHz
　　High Image Rejection Typ. 55dB （315MHz/433.92MHz）； Typ. 50dB 68.3MHz/915MHz） without Calibration
　　Input 1dB Compression Point
　　– Typ. –35dBm （Full Sensitivity Level）
　　– Typ. –20dBm （15dB Reduced Sensitivity）
　　Digital RSSI with Accuracy of ±5dB and 0.5dB Resolution
　　Programmable Output Power –10dBm to 14dBm （1dB Increments）
　　Low Current Consumption
　　– Typ. 9.3mA for RX （Low Band） Typ. 580μA Three-channel Polling
　　– Typ. 9.6/15.5mA for TX （Low Band, Pout = 6/10dBm）
　　Max. Power Down Current Consumption of 600nA at VS = 3.6V and T = 85℃
　　Programmable Clock Output Derived from Crystal Frequency
　　6Kbytes of In-System Self-programmable Flash for an Additional Application Software
　　24Kbytes of ROM with Atmel FIRmware
　　512 Bytes of EEPROM Data Memory for Transceiver Configuration and 768 Bytes of SRAM
　　SPI Interface for RX/TX Data Access and Transceiver Configuration
　　IRQ Signal Indicates the IC Condition Status
　　Automatic Antenna Tuning at TX Center Frequency for Loop Antenna
　　Automatic Application Channel Polling （3 RKE Channels, TPMS, RS）
　　ID Scanning Up to 18 Different IDs （ID Lengths of up to 4 Bytes）
　　Supply Voltage Range 1.9V to 3.6V and 4.5V to 5.5V
　　Temperature Range –40℃ to +105℃
　　Excellent ESD Protection at All Pins （±4kV HBM, ±200V MM, ±750V FCDM）
　　Small 5mm x 5mm QFN 32 Package Pin/Pitch 0.5mm
　　Pin Compatible IC with Rx Performance Identical with the Atmel Receiver ATA5780
　　Appropriate for Application Systems Compliant with EN 300 220 and FCC 15
　　ATA5830目标应用：
　　The transceiver is designed for use in the following application areas:
　　Remote Keyless Entry System （RKE）
　　Tire Pressure Monitoring System （TPMS）
　　Remote Start System （RS）
　　Remote Control System, e.g. garage door openers
　　Smart RF applications

            
                     




图1.ATA5830简化系统方框图





图2.ATA5830 CPU核方框图





图3.ATA5830典型3V应用电路图




图4.ATA5830典型5V应用电路图




　　图5.ATA5830采用回路天线的典型3V应用电路图