Maxim MAX11947四路ASIG收发器解决方案

Maxim公司的MAX11947是四路天线接口标准组织(ASIG)收发器,AISG v2.0和v3.0兼容,完全集成了带4:1复接器的调制解调器,以方便单个调制解调器和多达四个RF端口的连接.MAX11947接收器典型动态范围20dB,集成了带通滤波器,工作载频2.176MHz,窄带带宽200kHz,完全和ASIG频谱发射剖面兼容,能以所需的9.6kbps调制OOK信号,其高达115.2kbps向后和较早期ASIC标准兼容.输出功率可以随内部寄存器设定而变化,从0dBm到+6dBm.接收器灵敏度阈值也可以调整,从默认的-15dBm到低于-20dBm,以适应外接分离器的功率损耗.器件还具有直接输出功能以方便塔架安装设备的RS485总线仲裁.MAX11947采用小型4mm x4mm 20引脚TQFN封装,工作电压3.0V - 5.5V,工作温度-40C到+105C.主要用在基站单主和多主控制器(SALD和MALD),天线线路器件(ALD),天线阵列,塔架安装放大器(TMA),RS485半双工同轴连接,以及2MHz OOK调制解调器应用.本文介绍了MAX11947主要优势和特性,简化框图和应用电路,以及评估板MAX11947 EVK主要特性,电路图,材料清单和PCB设计图.

The MAX11947 is an AISG v2.0 and v3.0-compliant, fullyintegrated modem with a 4:1 multiplexer facilitating connectivitybetween a single modem and up to four RF ports.

The MAX11947 receiver offers a typical dynamic range of20dB and integrates a bandpass filter that operates at the2.176MHz carrier frequency with a narrow 200kHz bandwidthand is fully compliant with the AISG spectral emissionprofile. It can modulate OOK signals at the required9.6kbps and up to 115.2kbps for back compatibility withthe older AISG standard. The output power can be variedwith an internal register setting from under 0dBm to over+6dBm in order to compensate for loss in the external circuitryand cabling. The receiver sensitivity threshold is alsoadjustable from the default -15dBm down to less than-20dBm to accommodate power loss through an externalsplitter. The MAX11947 also features a direction outputto facilitate the RS-485 bus arbitration in tower-mountedequipment. The MAX11947 is available in a small, 4mm x4mm 20-pin TQFN and is rated for operation in the -40Cto +105C temperature range.

MAX11947主要优势和特性:

● AISG...