TI DAC5687 16位双通道500MSPS数模转换器参考设计方案
TI公司的DAC5687一款具有2x、4x和8x插值过滤器、一个复杂的数控振荡器、车载时钟乘法器，IQ补偿和片上参考电压的双通道16位高速数模转换器。这个DAC5687兼容DAC56836芯片，应用时只需要更改寄存器的设置就可以完成，并提供了额外的功能和优越的线性、噪声、串扰和锁相环相位噪声性能。该芯片具有六个信号处理模块：两个插值数字滤波器、一个具有32位数控振荡器的混频器、一个正交调制补偿模块、两个数字滤波器另一个插值模块、fS/2 和fS/4的粗混频模块。不同的操作模式下启用或旁路信号处理模块。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The DAC5687 is a dual-channel 16-bit high-speed digital-to-analog converter (DAC) with integrated 2×, 4×, and 8× interpolation filters, a complex numerically controlled oscillator (NCO), onboard clock multiplier, IQ compensation, and on-chip voltage reference. The DAC5687 is pin-compatible to the DAC5686, requiring only changes in register settings for most applications, and offers additional features and superior linearity, noise, crosstalk, and PLL phase noise performance.
The DAC5687 has six signal processing blocks: two interpolate-by-two digital filters, a fine frequency mixer with 32-bit NCO, a quadrature modulation compensation block, another interpolate-by-two digital filter, and a coarse frequency mixer with fS/2 or fS/4. The different modes of operation enable or bypass the signal processing blocks.
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