489487475AN_711_0| Application Note

489487475AN_711_0| Application Note

One Technology Way P.O. Box 9106 Norwood, MA 02062-9106 Tel: 781/329-4700 Fax: 781/326-8703 www.analog.com

AN-711 APPLICATION NOTE

AD5227 Evaluation Kit for the 64-Position, Up/Down Control Digital Potentiometer
by Alan Li

6 STEPS TO EVALUATION KIT SETUP 1. Run Setup.exe from the CD-ROM. The AD5227 software program is compatible with Windows 95, 98, NT, 2000, and XP . 2. Connect the evaluation board cable and connector to the PC parallel port. 3. Connect JPCS to enable the device. 4a. If using power from the PC, connect JPVDD. Power from various PCs can range from 3 V to 5 V. RW can be slightly higher at low voltage PCs.

4b. If using an external supply, users MUST disconnect JPVDD. Apply 2.7 V to 5 V between VDD and AGND. 5. Open the AD5227 Rev C program from the Windows Start > Program menu. Check the Power On PC box if there is no external power supply, then program the resistance settings. The programming buttons are self-explanatory. 6. Measure the resistance across W1 and B1.
Note: A dual op amp (AD822B) and 2.5 V reference (ADR03) are provided and can be used with the AD5227 for many general-purpose building blocks circuits. See the Applications section. The evaluation board can also be used for the AD5228, a 32-step, push button, manual control digital potentiometer.

Figure 1. Evaluation Kit Setup

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