【应用】国产高精度双路运放SGM8278-2XG/TR用于光模块APD检流电路，失调电压低至0.4mV

时间： 2021-04-02 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。在100G、200G或400G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。

图1：多路APD电路架构

电路架构如图1所示，高压运放通过DC/DC升压电源芯片供电，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。APD电流采样需要一个小封装的多路高压运放进行处理。本文推荐SGMICRO的双路小封装运放SGM8278-2XG/TR，单端供电3V~36V，双端供电±1.5V ~ ±18V，输入输出轨到轨。

图2：SGM8278-2XG/TR封装PIN脚图

高速光模块的PCB空间非常紧凑，如图所示，双路运放SGM8278-2XG/TR封装为WLCSP-1.57*1.57，此封装更能节省空间。SGM8278-2的失调电压低至0.4mV，输入电压噪声低至3μVP-P（0.1Hz至10Hz），可以满足极高的采样精度；其工作温度为-40℃ to +125℃，可以满足光模块等工业需求。

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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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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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