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Применения > > Variable Gain Noninverting Amplifier Using the AD5292 Digital Potentiometer and the OP184 Op Amp

Variable Gain Noninverting Amplifier Using the AD5292 Digital Potentiometer and the OP184 Op Amp (CN0112)

This circuit provides a low cost, high voltage, variable gain noninverting amplifier using the AD5292 digital potentiometer in conjunction with the OP184 operational amplifier.

The circuit offers 1024 different gains, controllable through an SPI-compatible serial digital interface. The ±1% resistor tolerance performance of the AD5292 provides low gain error over the full resistor range, as shown in Figure 2.

The circuit supports rail-to-rail inputs and outputs for both single-supply operation at +30 V and dual-supply operation at ±15 V, and is capable of delivering up to ±6.5 mA output current.

In addition, the AD5292 has an internal 20-times programmable memory that allows a customized gain setting at power-up.

The circuit provides accuracy, low noise, and low THD and is well suited for signal instrumentation conditioning.



Figure 1. Variable Gain NonInverting Amplifier Simplified Schematic (Decoupling and All Connections Not Shown)

Возможности

  • Digital Pot and Op Amp Create Variable Gain Noninverting Amplifier
  • Low Cost
  • High Voltage
  • Optmized for Low Distortion and Low Noise

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