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WM8510GEDS/RV 데이터시트(PDF) 49 Page - Wolfson Microelectronics plc

부품명 WM8510GEDS/RV
상세설명  MONO CODEC WITH SPEAKER DRIVER
PDF  56 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8510GEDS/RV 데이터시트(HTML) 49 Page - Wolfson Microelectronics plc

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WM8510
w
PP Rev 1.2 December 2004
49
POWER MANAGEMENT
SAVING POWER BY REDUCING OVERSAMPLING RATE
The default mode of operation of the ADC and DAC digital filters is in 64x oversampling mode. Under
the control of ADCOSR and DACOSR the oversampling rate may be doubled. 64x oversampling
results in a slight decrease in noise performance compared to 128x but lowers the power
consumption of the device.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R10
DAC control
3
DACOSR12
8
0
DAC oversample rate select
0 = 64x (lowest power)
1 = 128x (best SNR)
R14
ADC control
3
ADCOSR12
8
0
ADC oversample rate select
0 = 64x (lowest power)
1 = 128x (best SNR)
Table 34 ADC and DAC Oversampling Rate Selection
VMID
The analogue circuitry will not work unless VMID is enabled (VMIDSEL 00). The impedance of the
VMID resistor string, together with the decoupling capacitor on the VMID pin will determine the
startup time of the VMID circuit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
1:0
VMIDSE
L
00
Reference string impedance to VMID pin
(detemines startup time):
00=off (open circuit)
01=75kΩ
10=300kΩ
11=2.5kΩ (for fastest startup)
Table 35 VMID Impedance Control
BIASEN
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
3
BIASEN
0
Analogue amplifier bias control
Table 36 BIASEN Control



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