TDA7419 Просмотр технического описания (PDF) - STMicroelectronics

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TDA7419

3 band car audio processor

STMicroelectronics 

Description of the audio processor

TDA7419

4.4.3

Low and high frequency boost

Figure 6 shows the different loudness shapes in low and high frequency boost.

Figure 6. Loudness attenuation, fC = 2.4 kHz

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0

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4.4.4

Flat mode

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

4.5

Soft-mute

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

programmable slope. The mute process can either be activated by the soft-mute 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 7).

For timing purposes the bit 0 of the I2C bus output register is set to 1 from the start of muting

until the end of demuting.

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