TDA7719TR 查看數據表（PDF） - STMicroelectronics

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TDA7719TR

3 band car audio processor

STMicroelectronics 

Description

TDA7719

4.3.3

High frequency boost

Figure 7 shows the different Loudness shapes in low and high frequency boost.

Figure 7. Loudness attenuation, fc =2.4 kHz

4.3.4

4.4

18/46

Flat mode

In flat mode the loudness stage works as a 0dB to -15dB attenuator.

SoftMute

The digitally controlled SoftMute stage allows muting/demuting the signal with a I2C-bus

programmable slope. The mute process can either be activated by the SoftMute pin or by

the I2C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical

regions (see Figure 8).

For timing purposes the Bit0 of the I2C-bus output register is set to 1 from the start of muting

until the end of demuting.

Figure 8. SoftMute timing

1

EXT.

MUTE

+SIGNAL

REF

-SIGNAL

1

I2C BUS

OUT

D97AU634

Time

1. A started Mute action is always terminated and could not be interrupted by a change of the mute signal.

Doc ID 13698 Rev 5

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