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AN1643

APPLICATION NOTE

January 2003

Before to start the description we summarize what are the characteristic of the two boards.

TDA7448 Board:

With this board is possible to obtain the independent Volume Control for six channels in 1.0dB Steps, the

Volume attenuation ranges from 0 to -79dB.

The board is feed with a supply voltage ranging from 4.75 to10V.

It will be also described how to use the control sw.

SAM261 BOARD:

SAM261 is a BASH@6.1 (6x50W + 1X100W) amplifier utilizing the STA530 IC.

This board is specifically designed for multi-channel implementation in DVD - HTIB

Systems, Multi - Media systems, Mini and Micro systems and Set Top boxes.

SAM261 is dimensioned to provide the maximum Output Power (@ THD= 10%) on two channels and 1/3 max

Pout on the remaining Outputs, this assumption is important to define the main Power Supply size (+50V).

In this document we describe an application configuration where the used loads are:

5 X 50 W @ 8 ohm load (Left / Right/ Rear-Left /Rear- Right/ Centre)

1 X 100W @ 4 ohm load (Subwoofer)

CONTROL SOFTWARE

Figure 1.

by Luigi Pagotto & Marco Motta

6 CH VOLUME CONTROLLER

PLUS SAM261 BASH AMPLIFIER

In this document is explained how to connect the Audio processor TDA7448 to the board BASH