用在电流检测电路上，需要检测正负0-300A的电流，为了保证小电流检测精度打算做两个量程，一个是0-30A，一个是0-300A，用75mV300A的分流器，0-30A的量程需要把信号放大330倍，请问用哪个型号的芯片比较合适，最好是汽车级的。
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