WM8351CGEB/RV WOLFSON [Wolfson Microelectronics plc], WM8351CGEB/RV Datasheet - Page 88

• Manufacturer Part Number: WM8351CGEB/RV
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8351
w
13.9.4
The additional analogue outputs OUT3 and OUT4 have independent mixers and can be used in a
number of different ways:



The OUT3 and OUT4 output stages are powered from HPVDD and HPGND.
If OUT4 is providing a mono mix, it is recommended to reduce the level of OUT4 by 6dB to avoid
clipping in the event of 2 full-scale signals being combined. This is implemented via the OUT4_ATT
register field. When OUT4_ATT is asserted, then OUT4 = (L+R) / 2.
Figure 49 OUT 3 and OUT4 Mixers
Right output mixer
Right DAC output
Left output mixer
Right input mixer
Left output mixer
Left DAC output
Left DAC output
OUT3 and OUT4 as a stereo pair (OUT3 = left, OUT4 = right) to drive a headphone or line load
OUT3 or OUT4 as pseudo-ground outputs for headphones connected directly (without DC
blocking capacitors) to OUT1L/OUT1R or OUT2L/OUT2R
OUT4 as a mono mix of left and right signals
Left input mixer
OUT3 AND OUT4
MIXOUTL_TO_OUT4, R93[0]
MIXOUTL_TO_OUT3, R92[0]
MIXOUTR_TO_OUT4, R93[1]
MIXINL_TO_OUT3, R92[8]
MIXINR_TO_OUT4, R93[9]
DACL_TO_OUT3, R92[11]
DACR_TO_OUT4, R93[12]
DACL_TO_OUT4, R93[11]
OUT4_TO_OUT3, R92[3]
OUT3_2OUT4, R93[2]
MIXER
OUT3
MIXER
OUT4
1/2
-1
OUT4_ATTN,
R93[10]
-1
PD, April 2012, Rev 4.5
Production Data
OUT3
OUT4
88