WM8900LGEFK/RV Wolfson Microelectronics, WM8900LGEFK/RV Datasheet - Page 58

• Manufacturer Part Number: WM8900LGEFK/RV
• Description: Audio CODECs Ultra Low Power Hi-Fi CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8900LGEFK/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8900
OPTIMAL PLAYBACK POWER CONSUMPTION
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During DAC to Headphone playback, reduced bias modes are available to optimise power
consumption, giving increased battery life with a slight performance trade-off. These modes are
selected using the register bits DAC_BIAS (R115 bits 2:1),MIXOUT_BIAS (R115 bits 8:7), and
MASTER_BIAS (R116 bits 8:7).
Table 44 Playback Power Management
The reduced bias modes are available using the combination of register settings as shown.
Table 45 Bias Conditions for Default, Reduced and Ultra Low Power Modes
The performance and power consumption differences between these modes are detailed in Table
3, Table 4, Table 5, and Table 6 on page 15, and in Table 1.
Default:
Reduced Power
Mode:
Ultra Low Power
Mode:
R115 (73h)
Output Bias
Control
R116 (74h)
Master Bias
Control
Master Bias
Control
REGISTER
ADDRESS
BIT
8:7
2:1
8:7
MIXOUT_BIAS
DAC_BIAS
MASTER_BIAS
DAC_BIAS = 00
DAC_BIAS = 01
DAC_BIAS = 01
(Half bias)
(Half bias)
(Full bias)
LABEL
DEFAULT
00
00
10
MIXOUT_BIAS = 00
MIXOUT_BIAS = 00
MIXOUT_BIAS = 01
(Half bias)
(Full bias)
(Full bias)
Adjusts output mixer bias
00 = Full bias
01 = Half bias (recommended)
10 = Reserved
11 = Reserved
Adjusts DAC bias
00 = Full bias
01 = Half bias (recommended)
10 = Reserved
11 = Reserved
Adjusts master bias
00 = Reserved
01 = 0.75 bias
10 = full bias - default
11 = Reserved
PD, August 2008, Rev 4.0
DESCRIPTION
MASTER_BIAS = 10
MASTER_BIAS = 10
MASTER_BIAS = 01
Production Data
(x0.75 bias)
(Full bias)
(Full bias)
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