其中:
VC1,VC10,VC2,VC20,VC3,VC30,VC40,VC50分別為數據控制端
RF1和RF2分別為信號輸入輸出端。表2所列是AT-280的真值表。
表2 AT-280真值表
控 制 輸 入 | ||||||||
VC5 0 | VC4 0 | VC3 0 | VC3 | VC2 0 | VC2 0 | VC1 0 | VC 1 | 衰減(dB) |
1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 參考 |
0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0.5dB |
1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1.0dB |
1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 2.0dB |
1 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 4.0dB |
1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 8.0dB |
0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 15.5dB |