TDA7409 查看數據表（PDF） - STMicroelectronics

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产品描述 (功能)

比赛名单

TDA7409

CARRADIO-SIGNAL-PROCESSOR

STMicroelectronics 

TDA7409

1.4.3 Low & High Frequency Boost

Figure 5 shows the different Loudness-shapes in low & high frequency boost.

Figure 5. Loudness Attenuation , fC = 2.4KHz

















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1.5 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 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 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 6. 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.

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