Question
How will the external circuitry affect the total noise performance?
Answer
The ADA4622-2 is designed for 12 nV/?Hz wideband input voltage noise and maintains low noise performance at low frequencies (see Figure 75 in thedata sheet). This noise performance, along with the low input current as well as low current noise, means that the ADA4622-2 contributes negligiblenoise for applications with a source resistance greater than 10 k? and at signal bandwidths greater than 1 kHz.