E-TDA7461NDTR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

E-TDA7461NDTR

Car radio signal processor

STMicroelectronics 

TDA7461

Description of the audio processor part

3

Description of the audio processor part

3.1

Programmable input matrix

The programmable input matrix of the TDA7461 offers several possibilities to adapt the

audioprocessor to the desired application. In to the standard application we have:

● CD quasi differential

● Cassette stereo

● Phone differential

● AM mono

● Stereo decoder input.

The input matrix can be configured by only 2 bits: bits 3 and 4 of subaddress 0. Basically the

bit of subaddress 13 is fixed by the application and has to be programmed only once at the

startup of the IC.

For many configurations the two bits are also fixed during one application (e.g. the standard

application) and a change of the input source can be done by loading the first three bits of

subaddress 0.

In other configurations for some sources a programming of bit 3 and 4 of subaddress 0 is

necessary in addition to the three source selection bits. In every case only the subaddress 0

has to be changed to switch from one source to another.

The following picture shows the input and source programming flow:

Figure 3. Input configuration tree

TDA7461

CD QD

CD FD

APPL. 1

APPL. 2

APPL. 3

APPL. 4

APPL. 5

APPL. 6

CD QD

CASSETTE

FM STD

AM MONO

PHONE (D)

CD QD

CASSETTE

FM STD

AM STEREO

PHONE (SE)

CD QD

CASSETTE

FM STD

AM STD

PHONE (D)

CD FD

CASSETTE

FM STD

AM MONO

PHONE (SE)

CD FD

CASSETTE

FM STD

AM STEREO

CD FD

CASSETTE

FM STD

AM STD

PHONE (SE)

D97AU632B

1. In AMSTD configuration the AM mono signal is lead through the FM stereo decoder part to use its

additional filters.

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