TDA7460N 查看數據表（PDF） - STMicroelectronics

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比赛名单

TDA7460N

CAR RADIO SIGNAL PROCESSOR

STMicroelectronics 

TDA7460N

Figure 2. Input stages

CD

CDGND

PHONE

100K

PH_GND

CASSETTE

AM

MPX

100K

100K

100K

15K

15K

15K

15K

15K

-

+

15K

15K

-

+

15K

STEREODECODER

IN GAIN

D97AU633A

Mixing Stage

This stage offers the possibility to mix the internal

beep or the phone signal to any other source.

Due to the fact that the mixing stage is also lo-

cated behind the In-Gain stage fine adjustments

of the main source level can be done in this way.

Loudness

There are four parameters programmable in the

loudness stage (see fig. 3, 4, 5):

Figure 3. Loudness Attenuation @ fc = 400Hz

(second order)

0.0

-5.0

-10.0

-15.0

- Attenuation

- Center Frequency

- Loudness Q

- Flat Mode: in this mode the loudness stage works

as a 0 - 15dB attenuator.

Softmute

The digitally controlled softmute stage allows

muting/demuting the signal with a I2C bus pro-

grammable slope. The mute process can either

be activated by the softmute pin or by the I2C

bus. The slope is realized in a special S shaped

curve to mute slow in the critical regions (see fig-

ure 6).

For timing purposes the Bit 3 of the I2C bus out-

put register is set to 1 from the start of muting un-

til the end of demuting.

-20.0

10.0

100.0

1.0K

10.0K

Figure 4. Loudness Center frequency @ Attn.

= 15dB (second order)

0.0

-5.0

-10.0

-15.0

-20.0

10.0

100.0

1.0K

10.0K

9/31

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