WM8960 datasheet(26/92 Pages) WOLFSON

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WM8960

Production Data

PD, August 2013, Rev 4.2

ANALOGUE TO DIGITAL CONVERTER (ADC)

The WM8960 uses stereo 24-bit, 64x oversampled sigma-delta ADCs. The use of multi-bit feedback

and high oversampling rates reduce the effects of jitter and high frequency noise. The ADC Full Scale

input level is proportional to AVDD. With a 3.3V supply voltage, the full scale level is 1.0Vrms. Any

voltage greater than full scale may overload the ADC and cause distortion.

The ADCs are enabled by the ADCL/R register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R25 (19h)

Power

management (2)

ADCL

Enable ADC left channel:

0 = ADC disabled

1 = ADC enabled

ADCR

Enable ADC right channel:

0 = ADC disabled

1 = ADC enabled

Table 8 ADC Enable Control

The polarity of the output signal can be changed under software control using the ADCPOL[1:0]

data.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

ADC and DAC

Control (1)

6:5

ADCPOL[1:0]

ADC polarity control:

00 = Polarity not inverted

01 = ADC L inverted

10 = ADC R inverted

11 = ADC L and R inverted

R23 (17h)

Additional Control

(1)

3:2

DATSEL

[1:0]

ADC Data Output Select

00: left data = left ADC;

right data =right ADC

01: left data = left ADC;

right data = left ADC

10: left data = right ADC;

right data =right ADC

11: left data = right ADC;

right data = left ADC

Table 9 ADC Control

DIGITAL ADC VOLUME CONTROL

The output of the ADCs can be digitally amplified or attenuated over a range from –97dB to +30dB in

0.5dB steps. The volume of each channel can be controlled separately. The gain for a given eight-bit

code X is given by:

0.5

 (X-195) dB for 1  X  255;

MUTE for X = 0

The ADCVU control bit controls the loading of digital volume control data. When ADCVU is set to 0,

the LADCVOL or RADCVOL control data will be loaded into the respective control register, but will not

actually change the digital gain setting. Both left and right gain settings are updated when ADCVU is

set to 1. This makes it possible to update the gain of both channels simultaneously.

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