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Atmel公司的ATA5723、ATA5724 和 ATA5728是超高頻 (UHF) ASK/FSK 接收器集成電路 (IC),為廣泛的汽車射頻設備提供了性能組合. 這三款新器件在高度整合、出色性能和全球頻率覆蓋之間提供了最佳平衡。 這三款新的集成電路與引腳兼容，這意味著它們在不更改板設計的條件下便可用于所有標準的汽車頻率范圍：313-317 MHz (ATA5723)、432-436 MHz (ATA5724) 以及 868-870 MHz (ATA5728)。這些器件是使用 Atmel 的射頻 BiCMOS 工藝生產的。這些器件采用的是一種體積很小的 SSO20 封裝，非常適合遙控車門開關 (RKE) 和汽車輪胎壓力監測系統 (TPMS) 應用。 ATA5723、ATA5724 和 ATA5728 支持專用的曼徹斯特與二相編碼信號。此外，它們還提供對數 RSSI 輸出，使客戶能夠在較低的場強下實現較高的分辨率。這些集成電路出色的接收選擇性是通過整合的鏡頻抑制混頻器來實現的。 由于整合的 IF 濾波器、低相位噪聲壓控振蕩器 (VCO)、鎖相環 (PLL) 以及環路濾波器，該混頻器具有 30 dB 抑制性、-113 dBm 靈敏性以及改善的選擇性。 新款接收器集成電路只需很少的外部器件，同時無需外部濾波器，這使它們更具成本效益。10個無源元件、1個晶體以及1個射頻天線是制作一個接收器板應用所必備的。此外，由于集成電路具有較大的振動空間，因此設計者能夠選擇成本極低的晶體。 主要特性: Frequency Receiving Range of (3 Versions) – f0 = 312.5 MHz to 317.5 MHz or – f0 = 431.5 MHz to 436.5 MHz or – f0 = 868 MHz to 870 MHz 30 dB Image Rejection Receiving Bandwidth – BIF = 300 kHz for 315 MHz/433 MHz Version – BIF = 600 kHz for 868 MHz Version Fully Integrated LC-VCO and PLL Loop Filter Very High Sensitivity with Power Matched LNA – ATA5723/ATA5724: –107 dBm, FSK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3 –113 dBm, ASK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3 – ATA5728: –105 dBm, FSK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3 –111 dBm, ASK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3 High System IIP3 – –18 dBm at 868 MHz – –23 dBm at 433 MHz – –24 dBm at 315 MHz System 1-dB Compression Point – –27.7 dBm at 868 MHz – –32.7 dBm at 433 MHz – –33.7 dBm at 315 MHz High Large-signal Capability at GSM Band (Blocking –33 dBm at +10 MHz, IIP3 = –24 dBm at +20 MHz) Logarithmic RSSI Output XTO Start-up with Negative Resistor of 1.5 k 5V to 20V Automotive Compatible Data Interface Data Clock Available for Manchester and Bi-phase-coded Signals Programmable Digital Noise Suppression Low Power Consumption Due to Configurable Polling Temperature Range –40°C to +105°C ESD Protection 2 kV HBM, All Pins Communication to Microcontroller Possible using a Single Bi-directional Data Line Low-cost Solution Due to High Integration Level with Minimum External Circuitry Requirements 優勢: Low BOM List Due to High Integration Use of Low-cost 13 MHz Crystal Lowest Average Current Consumption for Application Due to Self Polling Feature Reuse of ATA5743 Software World-wide Coverage with One PCB Due to 3 Versions are Pin Compatible 系統方框圖: ATA572x方框圖: ATA572x應用電路圖: |
