Maxim MAX5857 16位5．9Gsps RF DAC解决方案

Maxim公司的MAX5857是高性能内插和调制的16位5.9Gsps RF DAC,能从DC到高达2.6GHz直接合成高达1.2GHz瞬时带宽.器件集成了插值滤波器,数字正交调制器,数控振荡器(NCO),时钟乘法PLL+VCO和14位RF DAC核,其4x线性相位插值滤波器简化了重构滤波器,而增强带通动态性能和降低了FPGA所需要的输入数据带宽,NCO允许输入基带信号的完全敏捷调制,用于直接RF合成,能避开复杂数据路径而直接接入RF DAC核.NCO分辨率亚1Hz,每道高达9.8304Gbps,主要用在DOCSIS 3.1遥控PHY和CCAP,数字视频广播调制器DVB-C2／DVB-T2／DVB-S2X／ISDB-T,Coax线缆以太网PON,点到点无线和仪器仪表.本文介绍了MAX5857主要优势和特性,简化框图和功能框图,时钟子系统框图和评估板MAX5887 EVK主要特性,和VC707系统连接图,电路图,材料清单和PCB设计图.
The MAX5857 high-performance, interpolating and modulating, 16-bit, 5.9Gsps RF DAC can directly synthesize up to 1.2GHz of instantaneous bandwidth from DC to frequencies greater than 2.6GHz. The device is optimized for cable access and digital video broadcast applications and meets spectral emission requirements for a broad set of radio transmitters and modulators including DOCSIS 3.1／3.0, DVB-C2, DVB-T2, DVB-S2X, ISDB-T, and EPoC.
The device integrates interpolation filters, a digital quadrature modulator, a numerically controlled oscillator (NCO), clock multiplying PLL+VCO and a 14-bit RF DAC core. The 4x linear phase interpolation filter simplifies reconstruction filtering, while enhancing passband dynamic performance and reducing the input data bandwidth required from an FPGA. The NCO allows for fully agile modulation of the input baseband signal for direct RF synthesis. The complex data path can be bypassed to access the RF DAC core directly.
The MAX5857 input interface accepts 16-bit input data through a six-lane JESD204B SerDes data input interface that is Subclass-0. The interface can be configured for 3, 4, 5, or 6 lanes and supports data rates up to 9.8304Gbps to optimize the I／O lane count and speed.
The MAX5857 clock input has a flexible interface that accepts a differential sine-wave or square-w...