WM8990ECS/RV Wolfson Microelectronics, WM8990ECS/RV Datasheet - Page 51

• 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
In Differential Mode (AINLMODE=10, AINRMODE=10), no additional volume control is available in
the input signal path, but the Input PGA volume control can be used to adjust the signal level as with
other modes. Both PGAs on the desired channel(s) must be enabled, and the PGA volumes of each
set to the same value for true Differential input characteristics. The PGA Output (LIN12 or RIN12) to
Mixer (INMIXL or INMIXR) path must also be enabled on the desired channel(s) by use of register bit
L12MNB or R12MNB. This configuration is illustrated in Figure 27. The applicable register settings
are shown in Table 11.
Table 11 Differential Mode Register Settings
Figure 27 Differential Mode Signal Paths
Left Channel Differential
Mode
(DIFFINL to AINLMUX)
Right Channel Differential
Mode
(DIFFINR to AINRMUX)
CONFIGURATION
1. Select Differential Mode
2. Enable LIN12 input path
3. Set channel volume as required.
Important: The LIN12 and LIN34
volume and mute settings must be
set to the same value. See Table 5
for full definitions of these fields.
1. Select Differential Mode
2. Enable RIN12 input path
3. Set channel volume as required.
Important: The RIN12 and RIN34
volume and mute settings must be
set to the same value. See Table 5
for full definitions of these fields.
REGISTER SETTINGS
AINLMODE = 10
L12MNB = 1
LIN12VOL, LIN12MUTE
LIN34VOL, LIN34MUTE
AINRMODE = 10
R12MNB = 1
RIN12VOL, RIN12MUTE
RIN34VOL, RIN34MUTE
PD, March 2009, Rev 4.0
WM8990
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