LMA8 Mic/Line Preamplifier
13
Noise performance and crosstalk
Input noise
The graph shows the spectral density of the input noise by measuring with a sweeping 1/3 octave bandpass filter across
the audio range.
The input was terminated by 150 ohms and the gain was set to max (+70 dB)
The noise spectrum is linear and smooth from 1 kHz and up and exhibits the typical characteristics of white noise.
Below 1 kHz, the 1/f corner noise is dominant. A noise component from the power supply can be seen at 100 Hz at a level
of approx. -148 dBu
The rms sum of the noise from 22 - 22 kHz is -134 dBu A weighted, or -131 dBu unweighted.
