WM8952ECSSLASHRV datasheet(22/72 Pages) WOLFSON

22 / 72 page

WM8952

Pre Production

PP, Rev 3.1, June 2011

ANALOGUE TO DIGITAL CONVERTER (ADC)

The WM8952 uses a multi-bit, oversampled sigma-delta ADC channel. The use of multi-bit feedback

and high oversampling rates reduces 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.

ADC DIGITAL FILTERS

The ADC filters perform true 24 bit signal processing to convert the raw multi-bit oversampled data

from the ADC to the correct sampling frequency to be output on the digital audio interface. The

digital filter path is illustrated in Figure 10.

Figure 10 ADC Digital Filter Path

The ADC is enabled by the ADCEN register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management 2

ADCEN

0 = ADC disabled

1 = ADC enabled

Table 11 ADC Enable

The polarity of the output signal can also be changed under software control using the ADCPOL

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R14

ADC Control

ADCPOL

0=normal

1=inverted

Table 12 ADC Polarity

WM8952ECS/RV Datenblatt(PDF) 22 Page - Wolfson Microelectronics plc