WM8985GEFLSLASHR datasheet(38/121 Pages) WOLFSON

tên linh kiện	WM8985GEFL/R

Giải thích chi tiết về linh kiện	Multimedia CODEC with Class D Headphone and Line Out

PDF	121 Pages

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nhà sản xuất	WOLFSON [Wolfson Microelectronics plc]

Trang chủ	http://www.wolfsonmicro.com

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WM8985

Production Data

PD, Rev 4.6, July 2009

Figure 18 Microphone Bias Schematic

ANALOGUE TO DIGITAL CONVERTER (ADC)

The WM8985 uses stereo multi-bit, oversampled sigma-delta ADCs. 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 AVDD1. 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 19.

Figure 19 ADC Digital Filter Path

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

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R2 (02h)

Power

management 2

ADCENL

Enable ADC left channel:

0 = ADC disabled

1 = ADC enabled

ADCENR

Enable ADC right channel:

0 = ADC disabled

1 = ADC enabled

Table 13 ADC Enable Control

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