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WM8972LEFL/R データシート(PDF) 14 Page - Wolfson Microelectronics plc

部品番号 WM8972LEFL/R
部品情報  MONO CODEC FOR PORTABLE AUDIO APPLICATIONS
PDF  49 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8972LEFL/R データシート(HTML) 14 Page - Wolfson Microelectronics plc

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WM8972L
Preliminary Technical Data
w
PTD Rev 2.2 June 2004
14
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7:6
INSEL
00
Input Select
00 = INPUT1
01 = INPUT2
11 = L-R Differential (either INPUT1+
– INPUT1- or INPUT2+ –
INPUT2-, selected by DS)
R32 (20h)
ADC Signal
Path Control
5:4
MICBOOST
00
Microphone Gain Boost
00 = Boost off (bypassed)
01 = 13dB boost
10 = 20dB boost
11 = 29dB boost
Table 2 Input Software Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R31 (1Fh)
ADC Input Mode
8
DS
0
Differential input select
0: INPUT1+ – INPUT1-
1: INPUT2+ – INPUT2-
Table 3 Differential Input Select
The MICBIAS output provides a low noise reference voltage suitable for biasing electret type
microphones and the associated external resistor biasing network. Refer to the Applications
Information section for recommended external components. The output can be enabled or disabled
using the MICB control bit (see also the “Power Management” section).
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R25 (19h)
Power
Management (1)
1
MICB
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
Table 4 Microphone Bias Control
The internal MICBIAS circuitry is shown below. Note that the is a maximum source current capability
for MICBIAS is 3mA. The external biasing resistors therefore must be large enough to limit the
MICBIAS current to 3mA.
AGND
MICBIAS
= 1.8 x VMID
= 0.9 X AVDD
VMID
internal
resistor
internal
resistor
MICB
Figure 6 Microphone Bias Schematic



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