AN1656 Datasheet, PDF (1/6 Pages) STMicroelectronics – 6 CH VOLUME CONTROLLER

AN1656
APPLICATION NOTE
6 CH VOLUME CONTROLLER
PLUS SAM351 BASH AMPLIFIER
by Luigi Pagotto & Marco Motta
In this document is explained how to connect the Audio processor TDA7448 to the board BASH
SAM351, in order to obtain a complete amplifier with the volume controlled via I²C bus.
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.
All functions are programmable via serial Bus (I²C).
The board is feed with a supply voltage ranging from 4.75 to10V.
It will be also described how to use the control sw.
SAM351 BOARD:
SAM351 is a BASH@5.1 (6x100W) amplifier utilizing the STA575 IC.
This board is specifically designed for multi-channel implementation in DVD - HTIB
Systems, Multi - Media systems, AV Receivers.
SAM351 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:
6 x 100W @ 6 ohm
CONTROL SOFTWARE
Figure 1.
February 2003
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