TDA7718B Datasheet, PDF (13/40 Pages) STMicroelectronics – 3 band car audio processor

TDA7718B
Description of the audioprocessor
4
Description of the audioprocessor
4.1
4.1.1
4.1.2
4.1.3
Input stages
One quasi-differential stereo input, one full-differential/quasi-differential stereo input and
three single-ended inputs are available.
Quasi-differential stereo input (QD1)
The QD input is implemented as a buffered quasi-differential stereo stage with 100 k input-
impedance at each input. There is -3 dB attenuation at QD input stage.
Single-ended stereo input (SE1, SE2, SE3)
The input-impedance at each input is 100 k and the attenuation is fixed to -3 dB for
incoming signals.
Full-differential or quasi-differential stereo input (FD/QD2)
This device provides a full-differential stereo input stage (FD) or 2^nd quasi-differential stereo
input stage. The full differential is a buffered full-differential stereo stage with 100 k input-
impedance at each input. When using as QD2 application, it needs to connect the two
QD2G pins together from external and the input impedance at QDG becomes 50 k. There
is -3 dB attenuation at the input stage. Figure 3 shows the block diagram of this input stage.
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