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AD8322ARU-REEL датащи(PDF) 10 Page - Analog Devices |
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AD8322ARU-REEL датащи(HTML) 10 Page - Analog Devices |
10 / 16 page REV. 0 AD8322 –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. Install 0 Ω chip resistors in R12, R13, and R17, and leave R14, R16, and R19 open. For 75 Ω input impedance, install a 110 Ω resistor in R7 located on the back side of the evaluation board and leave R5 and R6 open. 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, use the following equation to compute the correct value for R7. Desired Input Impedance = R7 235 Single-Ended-to-Differential Input (Figure 8 Option 2) Install the Mini-Circuits T1-6T-KK81 1:1 transformer in the T1 location of the evaluation board. Install 0 Ω chip resistors in R12, R13, R17, and R19, and leave R14 and R16 open. For 75 Ω input impedance, install 55 Ω resistors in R5 and R6 located on the back side of the evaluation board and leave R7 open. In this configu- ration 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, use the following equation to compute the correct values for R5 and R6. R5 = R6 = R, Desired Input Impedance = 2 × (R 117.5) Differential Input (Figure 8 Option 3) 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, install 0 Ω chip resistors in R8, R14, R15, and R16, and leave R12, R13, and R19 open. Referring to Figure 8 Option 3 and the AD8322 evaluation board, a differential input impedance of 150 Ω can be achieved by installing a 432 Ω resistor in R7, leaving R5 and R6 open. If another input impedance is desired, the following equation can be used to compute the correct value for R7. Desired Input Impedance = R7 235 DIFF IN T1 AD8322 R7 OPTION 1 DIFFERENTIAL INPUT TERMINATION DIFF IN T1 R5 R6 AD8322 OPTION 2 DIFFERENTIAL INPUT TERMINATION R7 VIN+ AD8322 VIN– OPTION 3 DIFFERENTIAL INPUT TERMINATION Figure 8. Differential Input Termination Options Installing the Visual Basic Control Software To install the “CABDRIVE_22” evaluation board control soft- ware, first close all Windows applications and run “SETUP.EXE” located on Disk 1 of the AD8322 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_22, or select the AD8322.EXE icon from the directory containing the software. Controlling the Gain/Attenuation of the AD8322 The slide bar controls the AD8322’s gain/attenuation, which is displayed in dB and in V/V. Although the AD8322 is designed for use at the eight gain codes described in the SPI Programming and Gain Adjustment section, all of the intermediate codes are included in the software. Code 0 is also included because of the high isolation it provides. The gain code (i.e., position of the slide bar) is displayed in decimal, binary, and hexadecimal (see Figure 9). POWER-UP AND POWER-DOWN The “Power-Up” and “Power-Down” buttons select the mode of operation of the AD8322 by controlling the logic level on the asynchronous PD pin. The “Power-Up” button applies a Logic 1 to the PD pin putting the AD8322 in forward transmit mode. The “Power-Down” button applies a Logic 0 to the PD pin select- ing reverse mode, where the forward signal transmission is disabled while a back termination of 75 Ω is maintained. 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 - AD8322ARU-REEL |
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Аналогичное описание - AD8322ARU-REEL |
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