Low Cost, High Voltage, Programmable Gain In-Amp Using the AD5292 Digital Potentiometer and the AD8221 In-Amp APPLICATION NOTE
●CIRCUIT DESCRIPTION
■This circuit employs the AD5292 digital potentiometer in conjunc-tion with the AD8221 in-amp, providing an overall low cost, high voltage, programmable gain in-amp.
●CIRCUIT FUNCTION AND BENEFITS
■The circuit shown in Figure 1 provides a low cost, high voltage, programmable gain instrumentation amplifier (in-amp) using the AD5292 digital potentiometer and the AD8221 in-amp.
■The circuit offers 1024 different gain settings that are controllable through a digital serial peripheral interface (SPI). The ±1% resistor tolerance performance of the AD5292 provides low gain error over the full resistor range, as shown in Figure 2.
■The circuit provides a high performance in-amp that delivers a high common-mode rejection ratio (CMRR) over frequency and dynamic programmable gain for both single-supply operation at +30 V and dual-supply operation at ±15 V. In addition, the AD5292 has an internal 20× programmable memory that allows the user to customize the in-amp gain at power-up.
■The circuit provides accurate, low noise, high gain and is well suited for signal instrumentation conditioning, precision data acquisition, biomedical analysis, and aerospace instrumentation.
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digital potentiometer 、 programmable gain instrumentation amplifier (in-amp) |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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8/2018 |
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Rev. B |
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AN-1578 |
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254 KB |
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