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Применения > > Low Cost Programmable Gain Instrumentation Amplifier Circuit Using the ADG1611 Quad SPST Switch and AD620 Instrumentation Amplifier

Low Cost Programmable Gain Instrumentation Amplifier Circuit Using the ADG1611 Quad SPST Switch and AD620 Instrumentation Amplifier (cn0146)

Data acquisition systems with wide dynamic range often need some method for adjusting the input signal level to the analog-to-digital converter (ADC). In order to get the most from an ADC, the maximum input signal should match its full-scale voltage. This is achieved by implementing a programmable gain amplifier circuit.

This circuit provides a programmable gain function using a quad SPST switch (ADG1611) and a resistor-programmable instrumen-tation amplifier (AD620).

The gain values are set by controlling the external gain setting resistor value, RG, with the four SPST switches, which are connected to four precision resistors.

Low switch on resistance is critical in this application, and the ADG1611 has the industry’s lowest RON (1 Ω typical) and is available in the smallest package, a 16-lead, 4 mm × 4 mm LFCSP.

The combination of the industry-standard low cost AD620 and the ADG1611 quad switch yields unmatched performance in this circuit and provides all the benefits of a precision instrumentation amplifier, along with the programmable gain feature.

Figure 1. Programmable Gain Instrumentation Amplifier Circuit (Simplified Schematic: All Connections and Decoupling Not Shown)

Возможности

  • Programmable gain analog front end for data acquisition
  • Low cost solution
  • Maximizes full scale range of ADC conversion

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