WM8976CGEFLSLASHV datasheet(28/114 Pages) WOLFSON

tên linh kiện	WM8976CGEFL/V

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

PDF	114 Pages

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nhà sản xuất	WOLFSON [Wolfson Microelectronics plc]

Trang chủ	http://www.wolfsonmicro.com

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WM8976

Production Data

PD, Rev 4.5, November 2011

Figure 16 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 17.

Figure 17 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 12 ADC Enable Control

AGND

MBVSEL=0

MICBIAS

= 1.8 x VMID

= 0.9 x AVDD

VMI

internal

resistor

internal

resistor

MBVSEL=1

MICBIAS

= 1.3 x VMID

= 0.65 x AVDD

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