WM8903LGEFK/RV Wolfson Microelectronics, WM8903LGEFK/RV Datasheet - Page 58

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WM8903LGEFK/RV

Manufacturer Part Number
WM8903LGEFK/RV
Description
Audio CODECs ULTRA LOW PWR HI FI CODEC
Manufacturer
Wolfson Microelectronics
Datasheets

Specifications of WM8903LGEFK/RV

Audio Codec Type
Stereo Codec
No. Of Adcs
2
No. Of Dacs
2
No. Of Input Channels
6
No. Of Output Channels
8
Adc / Dac Resolution
24bit
Sampling Rate
96kHz
Operating Temperature Range
-40°C To +85°C
Rohs Compliant
Yes
Adcs / Dacs Signal To Noise Ratio
96dB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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WM8903
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OUTPUT PGA BIAS CONTROL
The output PGA circuits use the Master bias current (see “Reference Voltages and Master Bias”).
The output PGA bias currents can also be controlled using the PGA_BIAS field as described in Table
36. Selecting a lower bias can be used to reduce power consumption, but may have a marginal
impact on audio performance in some usage modes. Selecting a higher bias offers a performance
improvement, but also an increase in power consumption.
Table 36 Output PGA Bias Control
OUTPUT DRIVERS BIAS CONTROL
The bias of the Headphone and Lineout drivers can be controlled independently of the PGA bias.
These may be increased or decreased using the OUTPUTS_BIAS field as described in Table 37.
This can be used to reduce power consumption or improve performance.
If it is desired to improve the performance of the outputs with the minimum increase in power
consumption, then it is recommended to increase the OUTPUTS_BIAS level and to use the default
setting of PGA_BIAS.
Table 37 Output Drivers Bias Control
R172 (ACh)
Analogue
Output Bias 0
R187 (BBh)
Analogue
Output Bias 2
REGISTER
REGISTER
ADDRESS
ADDRESS
BIT
6:4
BIT
2:0
PGA_BIAS [2:0]
OUTPUTS_BIAS
[2:0]
LABEL
LABEL
DEFAULT
DEFAULT
000
000
Headphone and Lineout PGA bias
control
000 = Normal bias
001 = Normal bias x 1.5
010 = Normal bias x 0.75
011 = Normal bias x 0.5
100 = Normal bias x 0.33
101 = Normal bias
110 = Normal bias
111 = Normal bias x 2
Headphone and Lineout Output
Drivers bias control
000 = Normal bias
001 = Normal bias x 1.5
010 = Normal bias x 0.75
011 = Normal bias x 0.5
100 = Normal bias x 0.33
101 = Normal bias
110 = Normal bias
111 = Normal bias x 2
PP, Rev 3.1, August 2009
DESCRIPTION
DESCRIPTION
Pre-Production
58

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