WM8990ECS/RV Wolfson Microelectronics, WM8990ECS/RV Datasheet - Page 55

• Manufacturer Part Number: WM8990ECS/RV
• Description: Audio CODECs Stereo CODEC w.Class AB/D speaker driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8990ECS/RV

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

w
Production Data
ADC DIGITAL VOLUME CONTROL
The output of the ADCs can be digitally amplified or attenuated over a range from -71.625dB to
+17.625dB in 0.375dB steps. The volume of each channel can be controlled separately. The gain for
a given eight-bit code X is given by:
0.375 × (X-192) dB for 1 ≤ X ≤ 239;
The ADC_VU bit controls the loading of digital volume control data. When ADC_VU is set to 0, the
ADCL_VOL or ADCR_VOL control data will be loaded into the respective control register, but will not
actually change the digital gain setting. Both left and right gain settings are updated when a 1 is
written to ADC_VU. This makes it possible to update the gain of both channels simultaneously.
Table 15 ADC Digital Volume Control
R15 (0Fh)
R16 (10h)
REGISTER
ADDRESS
8
7:0
8
7:0
BIT
ADC_VU
ADCL_VOL
[7:0]
ADC_VU
ADCR_VOL
[7:0]
LABEL
MUTE for X = 0
N/A
1100_0000b
(0dB)
N/A
1100_0000b
(0dB)
DEFAULT
+17.625dB for 239 ≤ X ≤ 255
ADC Volume Update
Writing a 1 to this bit will cause left
and right ADC volume to be updated
simultaneously
Left ADC Digital Volume
(See Table 16 for volume range)
ADC Volume Update
Writing a 1 to this bit will cause left
and right ADC volume to be updated
simultaneously
Right ADC Digital Volume
(See Table 16 for volume range)
DESCRIPTION
PD, March 2009, Rev 4.0
WM8990
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