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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(shè)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?cè)诓桓陌逶O(shè)計(jì)的條件下便可用于所有標(biāo)準(zhǔn)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(chǎn)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(guān) (RKE) 和汽車輪胎壓力監(jiān)測系統(tǒng) (TPMS) 應(yīng)用。 ATA5723、ATA5724 和 ATA5728 支持專用的曼徹斯特與二相編碼信號(hào)。此外，它們還提供對(duì)數(shù) RSSI 輸出，使客戶能夠在較低的場強(qiáng)下實(shí)現(xiàn)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(shí)現(xiàn)的。 由于整合的 IF 濾波器、低相位噪聲壓控振蕩器 (VCO)、鎖相環(huán) (PLL) 以及環(huán)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(shí)無需外部濾波器，這使它們更具成本效益。10個(gè)無源元件、1個(gè)晶體以及1個(gè)射頻天線是制作一個(gè)接收器板應(yīng)用所必備的。此外，由于集成電路具有較大的振動(dòng)空間，因此設(shè)計(jì)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(yōu)勢(shì): 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(tǒng)方框圖: ATA572x方框圖: ATA572x應(yīng)用電路圖: |
