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AN1643 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN1643 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 7 page 1/7 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. 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. 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 SAM261, in order to obtain a complete amplifier with the volume controlled via I2C bus. |
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