TDA7718BTR datasheet(13/40 Pages) STMICROELECTRONICS

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DocID18305 Rev 3

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TDA7718B

Description of the audioprocessor

4.1

Input stages

One quasi-differential stereo input, one full-differential/quasi-differential stereo input and

three single-ended inputs are available.

4.1.1

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.

4.1.2

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.

4.1.3

Full-differential or quasi-differential stereo input (FD/QD2)

This device provides a full-differential stereo input stage (FD) or 2nd 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.

TDA7718BTR 데이터시트(PDF) 13 Page - STMicroelectronics