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156

AT85C51SND3Bx

7632A–MP3–03/06

Line Inputs Preamplifier Gain In AT85C51SND3B2 & AT85C51SND3B3, when Line Inputs are selected as output

source (e.g. FM decoder playback) two preamplifier gain values can be applied by set

ting or clearing AILPG bit in ACIPG according to Table 161.

Table 161. Audio Codec Line Inputs Preamplifier Gain

Microphone Bias In addition, voltage supply function for an electret type microphone is integrated deliver-

ing High bias (1.5V) or low bias (2v) voltage. The high bias voltage output is only

available in high power supply configuration, while the low bias voltage output is avail

able in low or high voltage power supply configurations. Bias voltage output is selected

by AMBSEL bit in ACCON according to

Table 163 and is enabled by AMBEN bit in

ACCON according to Table 162.

Table 162. Audio Codec Microphone Bias Control

Table 163. Audio Codec Microphone Bias Voltage Selection

Audio DAC Interface The C51 core interfaces to the audio DAC interface through two special function regis-

ters: ADICON0 and ADICON1, the Audio DAC Interface Control registers (see

Table 182 and Table 183).

Figure 75 shows the audio interface block diagram where blocks are detailed in the fol-

lowing sections.

001 +6 dB 011 +18 dB ≥ 101 Reserved

AIPG2:0 Gain Value AIPG2:0 Gain Value AIPG2:0 Gain Value

AILPG Gain Value

0 +6 dB

1 +12 dB

AMBEN Control

0 Microphone bias output disabled

1 Microphone bias output enabled

AMBSEL Voltage Selection

0 high bias voltage 2V output

1 Low bias voltage 1.5 V output

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Atmel AT85DVK-07 Spezifikationen Seite 156