FDA803U datasheet(29/76 Pages) STMICROELECTRONICS

部件名	FDA803U

功能描述	1 x 45 W class D digital input automotive power amplifier with diagnostics, wide voltage operation range for car audio and telematic

PDF	76 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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29 / 76 page

DS12497 Rev 2

29/76

FDA803U

Muting function architecture

7.2

Analog-Mute

Analog-Mute senses when the mute command signal transits across the muting window,

and attenuates the output signal proportionally to the command signal level inside the

muting window.

Figure 40. Analog-Mute diagram

7.3

Digital-Mute

Digital-Mute acts on the digitally elaborated output signal attenuating it gradually to zero with

digital steps in a pre-defined time frame (tmute). The muting time, (tmute), can be selected by

I2C, (IB6 d7-d6). There are two different actions performed by digital-mute function:

Mute: it starts when any mute command signal, marked as Mixed Mute in Table 7, enters in

the muting window. This event rises the Start-Analog-Mute signal, communicated on

DB6[4]. The muting ends after tmute, selectable through IB6[7-6]. The Start-Analog-Mute

signal is ignored until the muting ramp has ended.

Approximately, the corresponding analog mute attenuation at the beginning of the muting

window is 0.5dB.

UnMute: it starts when all the mute commands, marked with Mixed Mute in Table 7, exit

from the muting window. This event resets the Start-Analog-Mute signal, communicated on

DB6[4]. The unmuting ends after tmute, selectable through IB6[7-6]. The Start-Analog-Mute

signal is ignored until the unmuting ramp has ended.

FDA803U 数据表(PDF) 29 Page - STMicroelectronics