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AD8323-EVAL датащи(PDF) 10 Page - Analog Devices |
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AD8323-EVAL датащи(HTML) 10 Page - Analog Devices |
10 / 16 page REV. 0 AD8323 –10– Single-Ended-to-Differential Input (Figure 8, Option 1) Install the Mini-Circuits T1-6T-KK81 1:1 transformer in the T1 location of the evaluation board. Place 0 Ω chip resistors at locations JP1, JP2, and JP3 such that the signal coming in VIN+ is directed toward the transformer and the differential signal coming out of the transformer is directed toward TP13 and TP14. For 75 Ω input impedance, install 39.2 Ω resistors in R5 and R6 located on the back side of the evaluation board. In this configuration the input signal must be applied to the VIN+ port of the evaluation board from a single-ended 75 Ω signal source. For input impedances other than 75 Ω, the correct value for R5 and R6 can be computed using the following equation: R R R Desired pedance R 5 6 2 800 == () =× () , Im Differential Input (Figure 8, Option 2) If a differential signal source is available, it may be applied directly to both the VIN+ and VIN– input ports of the evaluation board. In this case, 0 Ω chip resistors should be placed at loca- tions R8, JP1, JP2, and JP3 such that the VIN+ and VIN– signals are directed toward TP13 and TP14. Referring to Figure 8, Option 2, a differential input impedance of 150 Ω can be achieved by using a 165 Ω resistor for R7. For input imped- ances other than 150 Ω, the correct value for R7 can be computed using the following equation: Desired pedance R Im = () 7 1600 DIFF IN T1 R5 R6 AD8323 VIN+ AD8323 OPTION 1 DIFFERENTIAL INPUT TERMINATION OPTION 2 DIFFERENTIAL INPUT TERMINATION VIN– R7 Figure 8. Differential Input Termination Options Installing the Visual Basic Control Software To install the “CABDRIVE_23” evaluation board control soft- ware, close all Windows applications and then run “SETUP.EXE” located on Disk 1 of the AD8323 Evaluation Software. Follow the on-screen instructions and insert Disk 2 when prompted to do so. Enter the path of the directory into which the software will be installed and select the button in the upper left corner to complete the installation. Running the Software To invoke the control software, go to START -> PROGRAMS -> CABDRIVE_23, or select the AD8323.EXE icon from the directory containing the software. Controlling the Gain/Attenuation of the AD8323 The slide bar controls the AD8323’s gain/attenuation, which is displayed in dB and in V/V. The gain scales at 0.7526 dB per LSB with the valid codes being from decimal 0 to 71. The gain code (i.e., position of the slide bar) is displayed in decimal, binary, and hexadecimal (see Figure 9). POWER-UP, POWER-DOWN AND SLEEP The “Power-Up” and “Power-Down” buttons select the mode of operation of the AD8323 by controlling the logic level on the asynchronous PD pin. The “Power-Up” button applies a Logic 1 to the PD pin putting the AD8323 in forward transmit mode. The “Power-Down” button applies a Logic 0 to the PD pin selecting reverse mode, where the forward signal transmission is disabled while a back termination of 75 Ω is maintained. Checking the “Enable SLEEP Mode” box applies a Logic 0 to the asynchronous SLEEP pin, putting the AD8323 into SLEEP mode. Memory Section The “MEMORY” section of the software provides a convenient way to alternate between two gain settings. The “X->M1” but- ton stores the current value of the gain slide bar into memory while the “RM1” button recalls the stored value, returning the gain slide bar to that level. The “X->M2” and “RM2” buttons work in the same manner. |
Аналогичный номер детали - AD8323-EVAL |
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Аналогичное описание - AD8323-EVAL |
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