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你好，如果能满足你的运放需求，那自然可以省去外部运放。具体的还是要参考芯片手册111页5.10.2 Programmable Gain Amplifier (PGA)的参数：www.ti.com/.../tms320f280049.pdf 各类外部晶振的接法可以参考手册74页5.9.3.3 Input Clocks and PLLs
