WM8569

Production Data

w

PD Rev 4.0 June 2006

28

ADC HIGHPASS FILTER DISABLE

The ADC digital filters contain a digital highpass filter. This defaults to enabled and can be disabled

using software control bit ADCHPD.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001100

ADC Control

3

ADCHPD

0

ADC Highpass Filter Disable:

0: Highpass filter enabled

1: Highpass filter disabled

In left justified, right justified or I

If this bit is set high, the expected polarity of ADCLRC will be the opposite of that shown in Figure

13, Figure 14 and Figure 15. Note that if this feature is used as a means of swapping the left and

right channels, a 1 sample phase difference will be introduced. In DSP modes, the ADCLRP register

bit is used to select between modes A and B.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

In Left/Right/I

ADCLRC Polarity (normal)

0: normal DACLRC polarity

1: inverted DACLRC polarity

0001100

Interface Control

4

ADCLRP

0

In DSP Mode:

0: DSP mode A

1: DSP mode B

By default, ADCLRC and DOUT are sampled on the rising edge of ADCBCLK and should ideally

change on the falling edge. Data sources that change ADCLRC and DOUT on the rising edge of

ADCBCLK can be supported by setting the ADCBCP register bit. Setting ADCBCP to 1 inverts the

polarity of ADCBCLK to the inverse of that shown in Figure 13 to Figure 19

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001100

Interface Control

5

ADCBCP

0

ADCBCLK Polarity (DSP Modes):

0: normal BCLK polarity

1: inverted BCLK polarity

MUTE PIN DECODE

The MUTE pin can either be used an output or an input. As an output it indicated 1024 consecutive

zero samples to the DAC. By default selecting the MUTE to represent if the DAC has received more

than 1024 midrail samples will cause the MUTE to be asserted as a softmute on the DAC. Disabling

the decode block will cause any logical high on the MUTE pin to apply a softmute to the DAC.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001100

ADC Control

6

MPD

0

MUTE Pin Decode Disable:

0: MUTE pin decode enable

1: MUTE pin decode disable