SBOA345 June   2021 ADC10D1000QML-SP , ADC12D1600QML-SP , ADC12D1620QML-SP , INA1620 , OPA132 , OPA134 , OPA1602 , OPA1604 , OPA1611 , OPA1612 , OPA1622 , OPA1632 , OPA1637 , OPA1641 , OPA1642 , OPA1644 , OPA1652 , OPA1654 , OPA1655 , OPA1656 , OPA1662 , OPA1664 , OPA1671 , OPA1677 , OPA1678 , OPA1679 , OPA1688 , OPA1692 , OPA2132 , OPA2134 , OPA4132 , OPA4134

 

  1.   Trademarks
  2. 1Thermal Noise
  3. 2Operational Amplifier Voltage Noise
    1. 2.1 Flicker Noise
    2. 2.2 Broadband Noise
  4. 3Operational Amplifier Current Noise
    1. 3.1 Taking a Deeper Look at Noise Sources
  5. 4Calculating Voltage Noise at the Output
  6. 5Summary

5 Summary

When attempting to get the lowest overall noise performance out of your audio op amp there are a lot of factors to consider. It is very important to always consider all three noise sources, thermal, voltage, and current noise when building your Hifi circuit. Table 5-1 shows a list of our latest low noise audio amplifiers for your consideration.

Table 5-1 Low Noise Audio Amplifiers
Devices Voltage noise Current noise
OPA1656 – Ultra low noise CMOS 4.3 nV/rtHz 6 fA/rtHz
OPA1637 – Low power FDA 3.7 nV/rtHz 300 fA/rtHz
INA1620 – Lowest noise THD+N 2.8 nV/rtHz 800 fA/rtHz
OPA1612 – Ultra low noise Bipolar 1.1 nV/rtHz 1700 fA/rtHz