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AD8346ARU-REEL7 데이터시트(PDF) 10 Page - Analog Devices |
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AD8346ARU-REEL7 데이터시트(HTML) 10 Page - Analog Devices |
10 / 12 page REV. 0 AD8346 –10– EVALUATION BOARD The schematic of the AD8346 evaluation board is shown in Figure 25. This is a 4-layer FR4 board, the two center layers being used as ground planes and the top and bottom layers being used for signal and power respectively. The layout and silkscreen of the top (signal) layer is shown in Figure 26. The circuit closely follows the basic connections circuit shown in Figure 21. For normal operation the board’s only jumper should be in place (connecting ENBL to the supply). If the jumper is QBBP IBBI AD8346 QBBN IBBN COM4 COM1 COM4 COM1 VPS2 LOIN VOUT LOIP COM3 VPS1 COM2 ENBL 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 C4 0.01 F C3 100pF C6 100pF C7 100pF T1 ETC1-1-13 1 2 3 5 4 C2 0.01 F C1 100pF C5 100pF IP IN LO ENBL QP QN +VS VOUT +VS LK1 +VS 10k Figure 25. Evaluation Board Schematic removed, ENBL will be pulled to ground by a 10 k Ω resistor, putting the device into its power-down mode. All connectors are SMA-type. The I and Q inputs are dc coupled to allow direct connection to a dual DAC with differential out- puts. The local oscillator input is driven through a balun (M/A-COM Part Number. ETC1-1-13). To implement a single- ended drive, remove the balun and replace it with two surface mount 0 Ω resistors (i.e., from Pin 4 to 3 and Pin 1 to 5 of the balun). Figure 26. Layout and Silkscreen of Evaluation Board Signal Layer |
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