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Hi TI 专家:
当DS90UB954使用POC的功能时,手册中规范了几点layout的要求,其中有一点是阻抗控制:“Use coupled 100-Ω differential signal traces from the device pins to the AC-coupling caps. Use 50-Ω single ended traces from the AC-coupling capacitors to the connector”。请问为什么要在AC电容两端采用不同的阻抗控制?能不能在电容两侧都是50-欧姆单端走线?
是的,芯片端RIN+ 和RIN-仍然是差分信号,走的是100ohm阻抗,在靠近connector端,RIN- 通AC耦合电容到地,RIN+走50ohm单端信号。