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请教TLC5510的问题

Other Parts Discussed in Thread: TLC5510

有谁知道TLC5510这个芯片模拟输入的是电压信号还是电流信号,若是电压信号其范围是0.6~2.6,是否必须将模拟电压升高到这个范围,典型应用中的那个49.9欧的电阻做什么用的 ,从运放出来的信号必须接个电阻吗?