SBOA097B June   2004  – May 2015 INA132 , INA146 , INA152 , OPA2205 , OPA2277 , OPA277 , OPA301 , OPA335 , OPA364 , OPA4205 , OPA725 , TLV2341

 

  1.   High-Voltage Signal Conditioning for Low-Voltage ADCs
    1.     Trademarks
    2. 1 Introduction
    3. 2 Circuit 1: The Modular Approach
    4. 3 Circuit 2: Single-Supply/Single-Port Approach
    5. 4 Circuit 3: Difference Amp Approach
    6. 5 Circuit 4: Differential Input with INA146
    7. 6 Circuit 5: Differential Input Modular
    8. 7 Voltage References and Ranges
    9. 8 References
  2.   Revision History

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.

circuit_4_INA146_sboa097.gifFigure 7. Circuit 4 (Circuit 3 with Differential Input)