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WM8731 bảng dữ liệu(PDF) 22 Page - Wolfson Microelectronics plc

tên linh kiện WM8731
Giải thích chi tiết về linh kiện  Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates
PDF  56 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8731
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 February 2001
22
VMID
MICBIAS
AGND
Figure 13 Microphone Bias Schematic
ADC
The WM8731 uses a multi-bit oversampled sigma-delta ADC. A single channel of the ADC is
illustrated in the Figure 14.
FROM MICROPHONE
INPUT
FROM LINE INPUT
ANALOG
INTEGRATOR
INSEL
MULTI
BITS
TO ADC DIGITAL FILTERS
Figure 14 Multi-Bit Oversampling Sigma Delta ADC Schematic
The use of multi-bit feedback and high oversampling rates reduces the effects of jitter and high
frequency noise.
The ADC Full Scale input is 1.0V rms at AVDD = 3.3 volts. Any voltage greater than full scale will
possibly overload the ADC and cause distortion. Note that the full scale input tracks directly with
AVDD.
The device employs a pair of ADCs. The input can be selected from either the Line Inputs or the
Microphone input under software control. The two channels cannot be selected independently. The
control is shown in Table 4.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0000100
Analogue
Audio Path
Control
2
INSEL
0
Microphone/Line Input Select to ADC
1 = Microphone Input Select to ADC
0 = Line Input Select to ADC
Table 4 ADC Software Control
The digital data from the ADC is fed for signal processing to the ADC Filters.



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