【选型】8路DAC芯片SGM534X系列在光模块APD驱动偏压电路的应用

时间： 2020-02-29 来源：世强

技术问答

随着大数据时代的到来，5G应用而生，而光模块成为了5G市场上不可或缺的中坚力量，光模块中的接收部分需要将光信号转换为电信号，在长距离传输中，APD当仁不让地承载起了它应尽的使命。图1为整个光模块的框图：

图1：光模块架构图

在4*25G或8*25G的长距光模块中，就需要4路或8路APD，目前多路APD驱动芯片暂时还未出来，所以就需要用分立器件搭建APD驱动偏压电路。目前常用的是用DAC芯片和多路运放搭配，运放通过DC/DC升压电源芯片供电。电路架构图2，运放与D/A芯片的输出连接，运放输出连接APD，通过控制D/A的输出电压从而达到控制APD的偏压。

图2：多路APD驱动偏压架构图

国内先进的模拟集成电路设计公司圣邦微SGMICRO电子推出8路DAC芯片SGM534X系列（SGM5347为8位DAC、SGM5348为12位DAC）可以支持此应用，8路输出可以连接8路运放，从而驱动8路APD，基本能满足现阶段多路APD的需求。

其中，SGM5348采用TQFN-3*3-16L的小封装。光模块越来越倾向于小封装设计，在有限的PCB实现复杂的功能，对器件的体积要求非常高。SGM5348的只有3mm*3mm大小，非常符合光模块的应用需求。

SGM5348是一颗低功耗的DAC芯片。光模块对整体功耗也有特殊规定，有低功耗的要求。SGM5348在Power Down模式时，3V供电，功耗只有1.5uW。正常工作时，每路DAC仅消耗0.5mW功率。满足光模块低功耗的要求。

SGM5348使用SYNC、SCLK、Din几个引脚进行控制，占用MCU的IO口少，控制简单。工作温度为-40℃~125℃，满足光模块宽温的需求。

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SGMICRO（圣邦微）信号链和电源管理芯片选型指南

描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

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

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SGMICRO（圣邦微）ADC/DAC选型指南

型号- SGM51242R8,SGM5353-16,SGM8634C,SGM71612R82Z,SGM71612R81ZXG/TR,SGM51652H8,SGM58200,SGM61720,SGM5209-14,SGM58201,SGM71612R82,SGM51652H4,SGM42403,SGM452,SGM5347-12,SGM51652H4XTS38G/TR,SGM51652HXTS16G-S/TR,SGM58602,SGM71612R82M,SGM2048,SGM58600,SGM71612R81,SGM58601,SGM5347-10,SGM58031Q,SGM42402,SGM42401,SGM8T245XS,SGM71612R81Z,SGM48751X,SGM12UB1D2,SGM51652HX,SGM4029A,SGM6143X,SGM4573,SGM7SZ244,SGM8253,SGM2033,SGM51242R4,74LVC245A,SGM51652H4XTS38G-S/TR,SGMXXXXX,SGM51242R2,SGM58600XTRL20G/TR,SGM5351-16,SGM61030,SGM51622S8XLFH64G/TR,SGM4875XX,SGM58600XSS20G/TR,SGM25701,SGM8270,SGM51610S,SGM58601XSS28G/TR,SGM2050,SGM58031,SGM5200,SGM862,SGM71612R8XX,SGM6130X,SGM2054,SGM860,SGM8277,SGM,SGM51622H,SGM204X,SGM2059,SGM51622D,SGM51610C,SGM89XB,SGM5202-14,74AHC14,SGM61410,SGM5353,SGM51613HXTS16G/TR,SGM71612R8,SGM51652HBXTS38G-S/TR,74AHC08,SGM61411,SGM5208-14,SGM8610,SGM51652H,SGM58601XTQK28GITR,SGM71612R81ZXTSG16G/TR,SGM51652D,SGM5348-10,SGM51652S8XLFH64G/TR,SGM5348-8,SGM5348-12,SGM5349,SGM5355-16,GRM2030,SGM51613HXTQE16G/TR,SGM823,SGM61630,SGM71612R81ZXTS16G/TR,SGM51613H,SGM51622S8,SGM5349-16,SGM8249,SGM51613D,SGM8255B,SGM5860X,SGM5352-16,SGM05FB4D2,SGM4027A,SGM51652H8XTS38G/TR,SGM4551,SGM05FB8D2,SGM5200Q,SGM51652S8,SGM5347-8,SGM80XB

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16位高分辨率，1-8通道，外置参考源

Output Voltage Range(V)

Output Settling Time(μs)

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产品型号	品类	Package	Resolution	Update Rate	Out Channels
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数据手册 - SGMICRO - REV.A - DECEMBER 2019 PDF 英文下载查看更多版本

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