ADAU1361BCPZ-R7 datasheet(34/80 Pages) AD

34 / 80 page

ADAU1361

Data Sheet

Rev. D | Page 34 of 80

Noise Gate Mode 2 (see Figure 41) is selected by setting the

NGTYP[1:0] bits to 10. In this mode, the ADAU1361 improves

the sound of the noise gate operation by first fading the PGA

gain over a period of about 100 ms to the minimum PGA gain

value. The ADAU1361 does not do a hard mute after the fade is

complete, so some small background noise still exists.

THRESHOLD

INPUT

ANALOG

GAIN

DIGITAL

MUTE

OUTPUT

INTERNAL

NOISE GATE

ENABLE SIGNAL

250ms

MIN GAIN

100ms

Figure 41. Noise Gate Mode 2 (Analog Fade)

Noise Gate Mode 3 (see Figure 42) is selected by setting the

NGTYP[1:0] bits to 11. This mode is the same as Mode 2 except

that at the end of the PGA fade gain interval, a digital mute is

performed. In general, this mode is the best-sounding mode,

because the audible effect of the digital hard mute is reduced by

the fact that the gain has already faded to a low level before the

mute occurs.

THRESHOLD

INPUT

ANALOG

GAIN

DIGITAL

MUTE

OUTPUT

INTERNAL

NOISE GATE

ENABLE SIGNAL

MIN GAIN

250ms

100ms

Figure 42. Noise Gate Mode 3 (Analog Fade/Digital Mute)

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