TDA7404D datasheet(16/35 Pages) STMICROELECTRONICS

Part #	TDA7404D

Description	Car radio signal processor

PDF	35 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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16 / 35 page

Description of functionality

TDA7404

16/35

4.4.3

Low and high frequency boost

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

Figure 7.

Loudness attenuation, fC = 2.4 kHz

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 Mute pin or by the

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

regions (seeFigure 6).

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 de-muting.

Figure 8.

Soft-mute timing

Please notice that a started Mute-action is always terminated and could not be interrupted by a change of

the mute -signal.

-2 0

-1 5

-1 0

-5

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TDA7404D Datasheet(PDF) 16 Page - STMicroelectronics