The generic term for noise characteristics is EMC. This is a combination of EMI and EMS. EMI is the effect of noise emitted by the IC itself. An IC with poor EMI characteristics will superimpose its own noise even if it receives a clean signal. This becomes a factor of accuracy error. EMS is a measure of the effects of external noise. An IC with poor EMS characteristics will react to external noise such as cell phones; this can cause malfunctions. In sensor applications that require a high level of reliability such as automotive and industrial equipment, attention should be paid to low noise and noise immunity performance. ROHM calls operational amplifiers that have good characteristics against EMI and EMS "low noise op amps" and "high EMI immunity op amps," respectively.