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AD8370 数据表(PDF) 21 Page - Analog Devices |
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AD8370 数据表(HTML) 21 Page - Analog Devices |
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21 / 28 page ![]() AD8370 Rev. 0 | Page 21 of 28 EVALUATION BOARD AND SOFTWARE The evaluation board allows quick testing of the AD8370 by using standard 50 Ω test equipment. The schematic is shown in Figure 57. Transformers T1 and T2 are used to transform 50 Ω source and load impedances to the desired input and output reference levels. The top and bottom layers are shown in Figure 61 and Figure 62. The ground plane was removed under the traces between T1 and pins INHI and INLO to approximate a 100 Ω characteristic impedance. The evaluation board comes with the AD8370 control software that allows serial gain control from most computers. The evaluation board is connected via a cable to the parallel port of the computer. Simply by adjusting the slider bar in the control software, the gain code is automatically updated to the AD8370. 310 12 49 8 7 611 5 2 13 1 15 22 24 16 21 20 19 18 23 17 14 25 D-SUB 25 PIN MALE AD8370 67 8 23 5 1 11 10 9 15 14 16 13 12 4 23 5 14 C8 0.1 µF OUT+ OUT– IN+ IN– C7 0.1 µF C6 1 µF C5 0.1 µF +VS VS GND GND P2 VOCM PWUP C2 C1 T1 1:4 T2 2:1 R2 0 Ω R1 0 Ω R3 0 Ω R4 0 Ω C4 C10 OPEN R8 49.9 Ω R9 OPEN SW1 C3 1nF 1nF 1nF 1nF C9 OPEN L2* L1* R7 1k Ω R6 1k Ω R5 1k Ω TC4-1W 50 Ω Tx LINE 50 Ω Tx LINE 50 Ω Tx LINE 50 Ω Tx LINE JTX-2-10T *EMI SUPPRESSION FERRITE HZ1206E601R-00 Figure 57. AD8370 Evaluation Board Schematic |
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