WM8903LGEFK/RV Wolfson Microelectronics, WM8903LGEFK/RV Datasheet - Page 61

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

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

Pre-Production
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Table 39 Speaker Mixer Control
OUTPUT VOLUME CONTROL
Each analogue output can be independently controlled. The headphone output control fields are
described in Table 40. The line output control fields are described in Table 41. The differential line
output control fields are described in Table 42. The output pins are described in more detail in
“Analogue Outputs”.
The volume and mute status of each output can be controlled individually.
To prevent “zipper noise” when a volume adjustment is made, a zero-cross function is provided on all
output paths. When this function is enabled, volume updates will not take place until a zero-crossing
is detected. In the event of a long period without zero-crossings, a timeout will apply. The timeout
must be enabled by setting the TO_ENA bit, as defined in Table 61.
The volume update bits control the loading of the output driver volume data. For example, when
HPOUTVU is set to 0, the headphone volume data can be loaded into the respective control register,
but will not actually change the gain setting. The Left and Right headphone volume settings are
updated when a 1 is written to HPOUTVU. This makes it possible to update the gain of a Left/Right
pair of output paths simultaneously.
R55 (37h)
Analogue Spk
Mix Right 1
REGISTER
ADDRESS
BIT
3
2
1
0
DACL_MIXSPKR_
VOL
DACR_MIXSPKR
_VOL
BYPASSL_MIXSP
KR_VOL
BYPASSR_MIXS
PKR_VOL
LABEL
DEFAULT
0
0
0
0
Left DAC to Right Spkr Mixer
volume control
0 = 0dB
1 = -6dB
Right DAC to Right Spkr Mixer
volume control
0 = 0dB
1 = -6dB
Left Analogue Input to Right Spkr
Mixer volume control
0 = 0dB
1 = -6dB
Right Analogue Input to Right Spkr
Mixer volume control
0 = 0dB
1 = -6dB
PP, Rev 3.1, August 2009
DESCRIPTION
WM8903
61