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Digital Potentiometers Replace,http://www.5idzw.com
High-Resolution Applications
The digital potentiometers found in programmable gain amplifiers (PGAs) and instrumentation amplifiers (IAs) require much higher accuracies than do those used in standard adjustable circuits (Figure 2). Divider-ratio tolerances (accuracies) as low as 0.025% over the -40°C to +85°C range are often needed for these applications.
Figure 2. An op amp and a digital potentiometer (the lower IC) together implement a precision, programmable gain amplifier (PGA).
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