WM8993 Datasheet, PDF (97/229 Pages) Wolfson Microelectronics plc – Audio Hub CODEC for Multimedia Phones

Production Data
WM8993
IN1L
IN1R
Min = -57dB
Max = +6dB
Step = 1dB
MIXOUTLVOL
LINEOUT1NMIX
MIXOUTLVOL
MIXOUTRVOL
IN1R
+
IN1L
0dB or -6dB
LINEOUT1PMIX
MIXOUTLVOL
IN1L
+
IN1R
0dB or -6dB
Ground Loop
Noise Rejection
Ground Loop
Noise Rejection
LINEOUT1N
LINEOUT1P
Min = -57dB
Max = +6dB
Step = 1dB
MIXOUTRVOL
IN1L
IN1R
LINEOUT2NMIX
MIXOUTLVOL
MIXOUTRVOL
IN1R
+
IN1L
0dB or -6dB
LINEOUT2PMIX
MIXOUTRVOL
IN1L
+
IN1R
0dB or -6dB
Ground Loop
Noise Rejection
Ground Loop
Noise Rejection
LINEOUT2N
LINEOUT2P
LINEOUT1N_MUTE=0, LINEOUT1P_MUTE=0
LINEOUT2N_MUTE=0, LINEOUT2P_MUTE=0
LINEOUT1_MODE=1
MIXOUTL_TO_LINEOUT2N=1
MIXOUTR_TO_LINEOUT2P=1
LINEOUT_VMID_BUF_ENA=1
IN1L
IN1R
Min = -57dB
Max = +6dB
Step = 1dB
MIXOUTLVOL
LINEOUT1NMIX
MIXOUTLVOL
MIXOUTRVOL
IN1R
+
IN1L
0dB or -6dB
LINEOUT1PMIX
MIXOUTLVOL
IN1L
+
IN1R
0dB or -6dB
Ground Loop
Noise Rejection
Ground Loop
Noise Rejection
LINEOUT1N
LINEOUT1P
Min = -57dB
Max = +6dB
Step = 1dB
MIXOUTRVOL
IN1L
IN1R
LINEOUT2NMIX
MIXOUTLVOL
MIXOUTRVOL
IN1R
+
IN1L
0dB or -6dB
LINEOUT2PMIX
MIXOUTRVOL
IN1L
+
IN1R
0dB or -6dB
Ground Loop
Noise Rejection
Ground Loop
Noise Rejection
LINEOUT2N
LINEOUT2P
LINEOUT1N_MUTE=0, LINEOUT1P_MUTE=0
LINEOUT2N_MUTE=0, LINEOUT2P_MUTE=0
LINEOUT1_MODE=1
LINEOUT2_MODE=1
MIXOUTL_TO_LINEOUT1N=1 and/or
MIXOUTL_TO_LINEOUT1P=1
MIXOUTR_TO_LINEOUT2N=1 and/or
MIXOUTR_TO_LINEOUT2P=1
LINEOUT_VMID_BUF_ENA=1
Figure 32 Stereo Single-Ended Line Out from Figure 33 Mono Line Out to LINEOUT1N,
MIXOUTL and MIXOUTR to LINEOUT2
LINEOUT1P, LINEOUT2N, LINEOUT2P
The line outputs incorporate a common mode, or ground loop, feedback path which provides
rejection of system-related ground noise. The return path, via LINEOUTFB, is enabled separately for
LINEOUT1 and LINEOUT2 using the LINEOUT1_FB and LINEOUT2_FB bits as defined in Table 63.
Ground loop feedback is a benefit to single-ended line outputs only; it is not applicable to differential
outputs, which already inherently offer common mode noise rejection.
REGISTER
ADDRESS
R55 (37h)
Additional
Control
BIT
LABEL
7 LINEOUT1_FB
6 LINEOUT2_FB
DEFAULT
0b
0b
Table 63 Line Output Ground Loop Feedback Enable
DESCRIPTION
Enable ground loop noise
feedback on LINEOUT1
0 = Disabled
1 = Enabled
Enable ground loop noise
feedback on LINEOUT2
0 = Disabled
1 = Enabled
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PD, November 2010, Rev 4.0
97