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| Atmel ATA8201 ASK/FSK 接收器方案 | |||||
作者：Atmel 文章来源：Atmel 点击数： 更新时间：2008-1-31  |
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UHF ASK/FSK Receiver ATA8201/ ATA8202 The ATA8201/ATA8202 is a UHF ASK/FSK transparent receiver IC with low power consumption supplied in a small QFN24 package (body 5 mm 5 mm, pitch 0.65 mm). ATA8202 is used in the 433 MHz to 435 MHz band of operation, and ATA8201 in 313 MHz to 317 MHz. For improved image rejection and selectivity, the IF frequency is fixed to 440 kHz. The IF block uses an 8th-order band pass yielding a receive bandwidth of 420 kHz. This enables the use of the receiver in both SAW- and PLL-based transmitter systems utilizing various types of data-bit encoding such as pulse width modulation, Manchester modulation, variable pulse modulation, pulse position modulation, and NRZ. Prevailing encryption protocols such as Keeloq® are easily supported due to the receiver’s ability to hold the current data slicer threshold for up to 52 ms when incoming RF telegrams contain a blanking interval. This feature eliminates erroneous noise from appearing on the demodulated data output pin, and simplifies software decoding algorithms. The decoding of the data stream must be carried out by a connected microcontroller device. Because of the highly integrated design, the only required RF components are for the purpose of receiver antenna matching. ATA8201 and ATA8202 support Manchester bit rates of 1 Kbit/s to 10 Kbits/s in ASK and 1 Kbit/s to 20 Kbits/s in FSK mode. The four discrete bit rate passbands are selectable and cover 1.0 Kbit/s to 2.5 Kbits/s, 2.0 Kbits/s to 5.0 Kbits/s, 4.0 Kbits/s to 10.0 Kbits/s, and 8.0 Kbits/s to 10.0 Kbits/s or 20.0 Kbits/s (for ASK or FSK, respectively). The receiver contains an RSSI output to provide an indication of received signal strength and a SENSE input to allow the customer to select a threshold below which the DATA signal is gated off. ASK/FSK and bit rate ranges are selected by the connected microcontroller device via pins ASK_NFSK, BR0, and BR1. 主要特性： Transparent RF Receiver ICs for 315 MHz (ATA8201) and 433.92 MHz (ATA8202) With High Receiving Sensitivity Fully Integrated PLL With Low Phase Noise VCO, PLL, and Loop Filter High FSK/ASK Sensitivity:–105 dBm (ATA8201, FSK, 9.6 Kbits/s, Manchester, BER 10-3) 114 dBm (ATA8201, ASK, 2.4 Kbits/s, Manchester, BER 10-3) 104 dBm (ATA8202, FSK, 9.6 Kbits/s, Manchester, BER 10-3) 113 dBm (ATA8202, ASK, 2.4 Kbits/s, Manchester, BER 10-3) Supply Current: 6.5 mA in Active Mode (3V, 25°C, ASK Mode) Data Rate: 1 Kbit/s to 10 Kbits/s Manchester ASK, 1 Kbit/s to 20 Kbits/s Manchester FSK With Four Programmable Bit Rate Ranges Switching Between Modulation Types ASK/FSK and Different Data Rates Possible in ≤1 ms Typically, Without Hardware Modification on Board to Allow Different Modulation Schemes Low Standby Current: 50 μA at 3V, 25°C ASK/FSK Receiver Uses a Low-IF Architecture With High Selectivity, Blocking, and Low Intermodulation (Typical 3-dB Blocking 68.0 dBC at ±3 MHz/74.0 dBC at ±20.0 MHz, System I1dBCP = –31 dBm/System IIP3 = –24 dBm) Telegram Pause Up to 52 ms Supported in ASK Mode Wide Bandwidth AGC to Handle Large Out-of-band Blockers above the System I1dBCP 440-kHz IF Frequency With 30-dB Image Rejection and 420-kHz IF Bandwidth to Support PLL Transmitters With Standard Crystals or SAW-based Transmitters RSSI (Received Signal Strength Indicator) With Output Signal Dynamic Range of 65 dB Low In-band Sensitivity Change of Typically ±2.0 dB Within ±160-kHz Center Frequency Change in the Complete Temperature and Supply Voltage Range Sophisticated Threshold Control and Quasi-peak Detector Circuit in the Data Slicer Fast and Stable XTO Start-up Circuit (> –1.4 kWorst-case Start Impedance) Clock Generation for Microcontroller ESD Protection at all Pins (±4 kV HBM, ±200V MM, ±500V FCDM) Dual Supply Voltage Range: 2.7V to 3.3V or 4.5V to 5.5V Temperature Range: –40°C to +85°C Small 5 mm 5 mm QFN24 Package 应用： Industrial/Aftermarket Keyless Entry and Tire Pressure Monitoring Systems Alarm, Telemetering and Energy Metering Systems Remote Control Systems for Consumer and Industrial Markets Access Control Systems Home Automation Home Entertainment Toys  图1。ATA8201/2方框图  图2。ATA8201/2系统方框图  图3。ATA8201/2 3V应用电路图  图4。ATA8201/2 5V应用电路图 |
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