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AD8325ARUZ Datasheet(PDF) 10 Page - Analog Devices |
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AD8325ARUZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD8325 Differential Inputs The AD8325-EVAL evaluation board may be driven with a differential signal in one of two ways. A transformer may be used to convert a single-ended signal to differential, or a differ ential signal source may be used. Figure 7 and the following paragraphs describe each of these methods. Single-Ended-to-Differential Input (Figure 7, Option 1) A TOKO 617DB-A0070 1:1 transformer is preinstalled in the T3 location of the evaluation board. Install 0 W chip resistors at R14, R15, and R20, and leave R16 through R19 open. For 50 W differential input impedance, install a 51.1 W resistor at R13. For 75 W differential input impedance, use a 78.7 W resistor. In this configuration, the input signal must be applied to the VIN+ port of the evaluation board. For input impedances other than 50 W or 75 W, the correct value for R13 can be calculated using the following equation. Desired Input Impedance = (R13 1600) Differential Input (Figure 7, 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 W chip resistors should be installed at locations R16 through R19, and R14, R15, and R20 should be left open. The equation at the end of the preceding paragraph can be used to compute the correct value for R13 for any desired differential input impedance. For differential input impedances of 75 W or 150 W, the value of R13 will be 78.7 W or 165 W respectively. DIFF IN T1 R13 AD8325 DIFFERENTIAL INPUT, OPTION 1 VIN+ – DIFFERENTIAL INPUT, OPTION 2 VIN AD8325 R13 Figure 7. Differential Input Termination Options Installing the Visual Basic Control Software To install the “CABDRIVE_25” evaluation board control soft ware, close all Windows applications and then run “SETUP.EXE” located on Disk 1 of the AD8325 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_25, or select the AD8325.EXE icon from the directory containing the software. Controlling the Gain/Attenuation of the AD8325 The slide bar controls the AD8325’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 79. The gain code (i.e., position of the slide bar) is displayed in decimal, binary, and hexadecimal (see Figure 8). Transmit Enable, Transmit Disable, and Sleep The “Transmit Enable” and “Transmit Disable” buttons select the mode of operation of the AD8325 by controlling the logic level on the asynchronous TXEN pin. The “Transmit Enable” button applies a Logic 1 to the TXEN pin putting the AD8325 in forward transmit mode. The “Transmit Disable” button applies a Logic 0 to the TXEN pin selecting reverse mode, where the forward signal transmission is disabled while a back termina tion of 75 W is maintained. On early revisions of the software, the “Transmit Enable” and “Transmit Disable” buttons may be called “Power-Up” and “Power-Down” respectively. Checking the “Enable SLEEP Mode” box applies a Logic 0 to the asyn chronous SLEEP pin, putting the AD8325 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. –10– REV. A |
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