TDA7405 datasheet(13/56 Pages) STMICROELECTRONICS

部件名	TDA7405

功能描述	EQUALIZER CARRADIO SIGNAL PROCESSOR

PDF	56 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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TDA7405

2.4.3 Loudness Order

Different shapes of 1st and 2nd-Order Loudness

Figure 4. 1st and 2nd Order Loudness @ Attn. = 15dB, fP=400Hz

2.4.4 Flat Mode

In flat mode the loudness stage works as a 0dB to -19dB attenuator.

2.5 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 spe-

cial S-shaped curve to mute slow in the critical regions (see Figure 5). For timing purposes the Bit of the I2C-

bus output register is set to 1 from the start of muting until the end of de-muting.

Figure 5. Softmute-Timing

Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal.

-20.0

-15.0

-10.0

-5.0

0.0

10.0

100.0

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TDA7405 数据表(PDF) 13 Page - STMicroelectronics