5 Circuit 4: Differential Input with INA146

Some systems have differential inputs. This is a popular technique to reduce common-mode noise. Audio engineers have used low-level, differential signals in harsh on-stage environments for decades. The INA146 is designed for these types of applications. Figure 7 shows Circuit 3 adapted for differential input. However, changing Circuit 3 from single-ended to differential is straightforward. Note the polarity reversal of the inputs.

Figure 7. Circuit 4 (Circuit 3 with Differential Input)