WM8990ECS/RV Wolfson Microelectronics, WM8990ECS/RV Datasheet - Page 54

• 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

WM8990
w
ANALOGUE TO DIGITAL CONVERTER (ADC)
Table 13 Right Input Mixer Volume Control
The WM8990 uses stereo 24-bit, 64x oversampled sigma-delta ADCs. The use of multi-bit feedback
and high oversampling rates reduces the effects of jitter and high frequency noise. The ADC full
scale input level is proportional to AVDD. See “Electrical Characteristics” for further details. Any input
signal greater than full scale may overload the ADC and cause distortion.
The ADCs are enabled by the ADCL_ENA and ADCR_ENA register bits. If both ADCs are to be
enabled, they should be enabled simultaneously, i.e. with the same register write. If there is a
requirement to enable the ADCs independently of one another and use them simultaneously, the
ADCL_ADCR_LINK bit should be set. The EXT_ACCESS_ENA bit must be set before writing to the
ADCL_ADCR_LINK bit.
Table 14 ADC Enable Control
R2 (02h)
R117 (75h)
R122 (7Ah)
REGISTER
REGISTER
ADDRESS
ADDRESS
2:0
1
0
1
15
BIT
BIT
RR4BVOL
[2:0]
ADCL_ENA
(rw)
ADCR_ENA
(rw)
EXT_ACCESS_ENA
ADCL_ADCR_LINK
LABEL
LABEL
000b
(Mute)
DEFAULT
0b
0b
0b
0b
DEFAULT
RXVOICE to INMIXR Gain and Mute
000 = Mute
001 = -12dB
010 = -9dB
011 = -6dB
100 = -3dB
101 = 0dB
110 = +3dB
111 = +6dB
Note - RL4BVOL must be set to the same
value as RR4BVOL when AINRMODE=01.
Left ADC Enable
0 = ADC disabled
1 = ADC enabled
Right ADC Enable
0 = ADC disabled
1 = ADC enabled
Extended Register Map Access
0 = disabled
1 = enabled
0 = ADC Sync disabled
1 = ADC Sync enabled
DESCRIPTION
DESCRIPTION
PD, March 2009, Rev 4.0
Production Data
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