adc32j22EVM射频信号输入变压器选用ADT1-1WT+,此变压器为75欧。请问外接的射频信号源需要是75欧还是50欧?
Kailyn Chen:
您好,EVM use's guide中描述的变压器的输入阻抗默认的也是50ohm, 您说的75ohm是指的哪里?
The default input termination is 50 Ω, which is formed by two 25-Ω resistors connected to the ADC VCM node.
user419714:
回复 Kailyn Chen:
变压器ADT1-1WT+自身的阻抗是75欧,见下图:
Kailyn Chen:
回复 user419714:
您好,如果变压器是75ohm的话,那么信号源的阻抗也需要75ohm,才能做到阻抗匹配。