STA381BWS datasheet(170/174 Pages) STMICROELECTRONICS

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STA381BWS

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DocID018937 Rev 7

Besides the digital input to the power output path, a line in to the headphone / 2Vrms line out

path is provided. The headphone and line out block diagram is shown in Figure 49. The

overall gain is determined by the external resistors R1 and R2 as:

Gain=R2/R1*2

The LINEINR/LINEINL pins can be either connected to an external line in or to the

F3XL/F3XR pins as depicted in Figure 46 and Figure 47. Thanks to this latter option it is

possible to route the digital input (SAI) content on both the power and the line

out/headphone output.

Note:

The charge pump of the headphone and line out cannot drive a purely capacitive load.

Please refer to AN3959 (2.0-channel demonstration board based on the STA381BW and

STA381BWS) for detailed information about headphone and line out filtering.

8.3

Typical output configuration

Figure 50 illustrates the typical output configuration used for BTL stereo mode. Please refer

to the application note for all the other schematics for the recommended output

configuration.

Figure 50. Output configuration for stereo BTL mode in filterlight configuration

Note:

For further information, please refer to application note AN3959, 2.0-channel demonstration

board based on the STA381BW and STA381BWS.

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STA381BWS 데이터시트(PDF) 170 Page - STMicroelectronics