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DAC8742H: EVM

Part Number: DAC8742H

尊敬的工程师您好,请问外接160Ω负载电阻是什么意思,在DAC8742H EVM的mod-in 和mod-out可以直接用示波器观察fsk载波信号吗?为什么没有检测到电压信号?是需要连接负载电阻吗?