AT83SND2CMP3B datasheet(90/241 Pages) ATMEL

90 / 241 page

4341F–MP3–03/06

AT8xC51SND2C/MP3B

15.1.7

Digital Mixer Control

The Audio DAC features a digital mixer that allows the mixing and selection of multiple input

sources.

The mixing / multiplexing functions are described in the following table according with the next

figure:

Figure 15-9.

Mixing / Multiplexing functions

Note:

Whenever the two mixer inputs are selected, a –6 dB gain is applied to the output signal. When-

ever only one input is selected, no gain is applied.

Note:

Refer to DAC_MC register Table 15-20. for signal description

15.1.8

Master Clock and Sampling Frequency Selection

The following table describes the different modes available for master clock and sampling fre-

quency selection by setting OVRSEL bit in DAC_CSFC register (refer to Table 15-21.).

Table 15-7.

Master Clock selection

The selection of input sample size is done using the NBITS 1:0 in DAC_MISC register (refer to

Table 15-22.) according to Table 15-8.

Table 15-8.

Input Sample Size Selection

Signal

Description

LMSMIN1

Left Channel Mono/Stereo Mixer Left Mixed input enable – High to enable, Low to disable

LMSMIN2

Left Channel Mono/Stereo Mixer Right Mixed input enable – High to enable, Low to disable

RMSMIN1

Right Channel Mono/Stereo Mixer Left Mixed input enable – High to enable, Low to disable

RMSMIN2

Right Channel Mono/Stereo Mixer Right Mixed input enable – High to enable, Low to disable

Volume

Control

Volume

Control

Volume

Control

Volume

Control

Left channel

Right channel

From digital

filters

To DACs

OVRSEL

Master Clock

0256 x FS

1384 x FS

NBITS 1:0

Format

16 bits

18 bits

20 bits

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