WM8976 datasheet(25/108 Pages) WOLFSON

tên linh kiện	WM8976

Giải thích chi tiết về linh kiện	Stereo CODEC With Speaker Driver

PDF	108 Pages

Scroll/Zoom	100%

nhà sản xuất	WOLFSON [Wolfson Microelectronics plc]

Trang chủ	http://www.wolfsonmicro.com

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25 / 108 page

Pre-Production

WM8976

PP Rev 3.0 April 2006

Figure 9 Microphone Bias Schematic

ANALOGUE TO DIGITAL CONVERTER (ADC)

The WM8976 uses a multi-bit, oversampled sigma-delta ADC. 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 for each ADC channel is illustrated in Figure 10.

Figure 10 ADC Digital Filter Path

The ADC is enabled by the ADCENL/R register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management 2

ADCENL

Enable ADC:

0 = ADC disabled

1 = ADC enabled

Table 11 ADC Enable Control

AGND

MBVSEL=0

MICBIAS

= 1.8 x VMID

= 0.9 x AVDD

VMID

internal

resistor

internal

resistor

MBVSEL=1

MICBIAS

= 1.3 x VMID

= 0.65 x AVDD

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