TDA7461N Datasheet, PDF (7/31 Pages) STMicroelectronics – CAR RADIO SIGNAL PROCESSOR

TDA7461N
DESCRIPTION OF THE AUDIOPROCESSOR
PART
Programmable Input Matrix
The programmable input matrix of the TDA7461N
offers several possibilities to adapt the audioproc-
essor to the desired application. In to the stand-
ard application we have:
CD quasi differential
Cassette stereo
Phone differential
AM mono
Stereodecoder input.
The input matrix can be configured by only 2 bits:
Figure 1. Input Configuration Tree
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 ap-
plication) and a change of the input source can
be done by loading the first three bits of subad-
dress 0.
In other configurations for some sources a pro-
gramming of bit 3 and 4 of subaddress 0 is nec-
essary 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:
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
Note: in AMSTD configuration the AM mono signal is lead through the FM stereodecoder part to use its additional filters and high-cut function.
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