TDA7412 查看數據表（PDF） - STMicroelectronics

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TDA7412

CARRADIO SIGNAL PROCESSOR

STMicroelectronics 

TDA7412

1.0 DESCRIPTION OF THE AUDIOPROCESSOR PART

1.1 Input stages

In the basic configuration two full-differential, two mono-differential, one single ended stereo and one single-

ended mono input are available. In addition a dedicated input for the stereodecoder MPX-signal is present.

Figure 1. Input-stages

SE2

FD1-

STEREO

100K

FD1+

100K

SE3

FD2-

STEREO

100K

FD2+

100K

SE4

MD1G

MONO

100K

MD1

SE4R

MD2G

MONO

100K

100K

MD2

SE1

STEREO

AM

MONO

100K

100K

100K

MPX

100K

15K 15K

1

-

+

1

15K 15K

15K 15K

1

-

+

1

15K 15K

28K

28K

-

+

28K

28K

SE4R

28K

28K

-

+

28K

28K

NOISE BLANKER

+

STEREO DECODER

MAIN SOURCE

SE3

SELECTOR

FD1/SE2

FD2

MD1/SE4

MUTE

MD2

SE1

100K

AM

FM

IN GAIN

MD2

MD1

FM

BEEP

MIXING

SELECTOR

MUTE

MIXING STAGE

SECOND SOURCE

SE3

SELECTOR

FD1/SE2

FD2

MD1/SE4

MUTE

MD2

SE1

AM

FM

IN GAIN

D00AU1142

Full-differential stereo Input 1 (FD1)

The FD1-input is implemented as a buffered full-differential stereo stage with 100kΩ input-impedance at each

input. The attenuation is programmable in 3 steps from 0 to -12dB in order to adapt the incoming signal level.

A 6dB attenuation is included in the differential stage, the additional 6dB are done by a following resistive divid-

er. This input is also configurable as two single-ended stereo inputs (see pin-out).

Full-differential stereo Input 2 (FD2)

The FD2-input has the same general structure as FD1, but with a programmable attenuation of 0 or 6dB em-

bedded in the differential stage.

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