详细说明：

1000米传输距离Sub 1GHz无线智能电网芯片A7108 笙科电子(AMICCOM)于2011年7月发表新一代应用于智能电网的射频芯片，该芯片料号为A7108，支持中国智能电网所选用的470MHz ~ 510MHz，以及欧洲无线自动读表所使用的868.3MHz 与868.95MHz频段，除此之外，A7108当然也支持1GHz 以下免执照的ISM Band应用 (300MHz ~ 950MHz)，比如日本的310MHz，欧美及亚洲常见的433.92MHz，美国与台湾的允许的915MHz等频段。A7108属于笙科电子第四代高效能芯片， data rate支持2Kbps ~ 250Kbps，调变方式可选择FSK或GFSK，MCU透过SPI接口即可操作A7108的RF模式以及存取内建的64 Bytes TXFIFO 与RXFIFO。 A7108最大的优势在于超优质的RF性能，以470MHz ~ 510MHz的频段来说，内建的PA可输出高达20dBm的发射功率，接收器拥有超高灵敏度 (-114dBm @ 10Kbps)。在10Kbps的条件下，笙科的参考设计(MD7108-A50)搭配直立的单心线天线 (裁剪四分之一波长长度之1.6mm单心线)，在海边空旷区域实测可得1300米，街道实测之距离可达1000米。若将data rate 从10Kbps降为2Kbps，则空旷区域实测距离增加至1600米。 除了远距离传输能力外，A7108内建的RSSI 可协助软件工程师侦测干净的传输信道，芯片内部的Auto Calibration机制，用来克服半导体制程的变异，可稳定地在各种环境下工作，自动频率补偿(AFC)的功能可解决RF频偏造成的灵敏度衰退。在数据的处理上，A7108提供直接模式(Direct mode)与FIFO模式。直接模式适合MCU选用自行定义之封包格式，而FIFO模式则使用芯片内建之TXFIFO封包格式(含FEC，CRC与Manchester 编码等功能)。 适合A7108的应用非常多，比如AMR无线自动读表 (如无线智能电表，或无线热表，燃气表等等)，远距离双向汽车防盗器，工业控制器 ，智能建筑之能源管理，家庭自动化等等。笙科提供的参考设计，含外围低(高)通滤波器，搭配合适的天线与PA设定，当量测值EIRP = 14dBm 时 (14dBm有效等向辐射功率)，可通过美国FCC part 15. 247 以及欧洲ETSI EN300-220 的EMC规范。 A7108的电源管理部分支持Deep sleep mode，Sleep，Idle mode 与WOR 模式 (Wake On RX)， WOR功能提供A7108自动唤醒，接收不定时的RF网络封包，以延长电池的使用寿命。Deep Sleep mode相当于完全关掉A7108，其电流消耗仅须200 nA。整体上，A7108是一颗高效能的射频芯片，内建的功能可以有效地降低开发复杂度与开发成本。 供货与封装情况 A7108采用 4 mm x 4 mm QFN-20 封装，笙科及其授权代理商现已开始供货。欢迎联系授权代理商索取IC样品与评估模块, 并开始开发工作。笙科电子除提供业界领先的芯片效能外，技术团队亦提供优质的中文技术服务，量产时的 RF测试工具 (TF7108)，详情请联系笙科电子。www.amiccom.com.tw 或是代理商 奇翰電子 电气参数： Therefore, A7108 is very suitable for long LOS (line-of-sight) applications without the need to add an external LNA or PA. The on-chip data rate divider supports programmable on-air data rates from 2K to 250Kbps to satisfy different system requirements. For a battery powered system, A7108 supports fast PLL settling time (35 us), Xtal settling time (500 us) and on-chip Regulator settling time (450 us) to reduce average power consumption. For packet handling, A7108 support direct mode as well as FIFO mode. In the direct mode, GIO1 or GIO2 can be serially output the raw data from the digital demodulator in RX mode. Also, in TX mode, MCU can serially feed the digital data to GIO1 or GIO2 which is connected to the modulator. The other way is FIFO mode, the preamble of a packet is self generated and the physical packet ID is programmable. The built-in separated 64-bytes TX/RX FIFO can be used for data buffering including CRC of error detection, FEC of error correction, data whitening for data encryption /decryption, and Manchester encoding. Additional device features such as on-chip regulator, low battery detect, carrier detect, preamble detect, frame sync in FIFO mode, AGC (Auto Gain Control), AFC (Auto Frequency compensation), Auto calibration (VCO and IF Filter), programmable IF Filter, multi Xtal sources, on-chip Xtal compensated capacitors, and RSSI for the clear channel assistance are used to simplify system development and cost. Such high level integrations offer reduced BOM cost for a high performance ISM bands product. 2. Typical Applications Wireless ISM band data communication Remote control RKE (Remote Keyless Entry) Wireless Energy Management Home automation AMR (Auto Meter Reading) 3. Features Small size (QFN 4X4, 20 pins). Frequency band: 315/433/470/868/915 MHz. FSK and GFSK modulation. Supports 3-wire or 4-wire SPI. Deep sleep current (0.2uA). Low sleep current (2 uA). TX Current consumption 433MHz: 30mA @ 10dBm, 70mA @ 17dBm. TX Current consumption 868MHz: 38mA @ 9dBm, 55mA @ 13dBm. RX Current consumption (AGC Off) 434MHz: 13.5 mA and 868MHz: 14 mA. On chip regulator, supports input voltage 2.0 ~ 3.6 V. Programmable data rate from 2Kbps to 250Kbps. Physical 64 bytes TX/RX FIFO buffers. FIFO extension up to 256 bytes. High RX sensitivity 433.92MHz. -117dBm at 2Kbps on-air data rate. -114dBm at 10Kbps on-air data rate. -110dBm at 50Kbps on-air data rate. -107dBm at 100Kbps on-air data rate. -106dBm at 150Kbps on-air data rate. -103dBm at 250Kbps on-air data rate. Fast PLL settling time (35 us). On-chip full range VCO and Fractional-N PLL synthesizer. On-chip low power RC oscillator for WOR (Wake on RX) function. AFC (Auto Frequency Compensation) for frequency drift due to temperature. Supports low cost crystal (12,8 / 16 / 18 MHz). On chip 9-bit ADC and RSSI (Received Signal Strength Indicator). Programmable IF filter bandwidth (50K / 100K / 150KHz / 250KHz). Programmable carrier sense indicator. Frame synchronization recognition in FIFO mode. FEC / Manchester / data whitening / CRC-16 (CRC-CCITT).