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WM8976 Datasheet(PDF) 70 Page - Wolfson Microelectronics plc

Part # WM8976
Description  Low Power CODEC With Speaker Driver
PDF  83 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976 Datasheet(HTML) 70 Page - Wolfson Microelectronics plc

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WM8976
Preliminary Technical Data
w
PTD Rev 2.0 February 2005
70
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
DACOSR128
0
DAC oversample rate select
0 = 64x (lowest power)
1 = 128x (best SNR)
R14
ADC control
3
ADCOSR128
0
ADC oversample rate select
0 = 64x (lowest power)
1 = 128x (best SNR)
Table 58 ADC and DAC Oversampling Rate Selection
VMID
The analogue 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
VMIDSEL
00
Reference string impedance to VMID pin
(detemines startup time):
00=off (open circuit)
01=75kΩ
10=300kΩ
11=5kΩ (for fastest startup)
Table 59 VMID Impedance Control
BIASEN
The analogue amplifiers will not operate unless BIASEN is enabled.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
3
BIASEN
0
Analogue amplifier bias control
Table 60 Analogue Bias Control
ESTIMATED SUPPLY CURRENTS
When either the DACs or ADC are enabled it is estimated that approximately 4mA will be drawn
from DCVDD when fs=48kHz (This will be lower at lower sample rates). When the PLL is enabled
an additional 700 microamps will be drawn from DCVDD.



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