Rainbow Electronics MAX98089 - Manual (Page 110)

��������������������������������������������������������������� Maxim Integrated Products 110
MAX98089
Low-Power, Stereo Audio Codec
with FlexSound Technology
Headphone Output Mixers
The headphone amplifier mixer accepts input from the
stereo DAC, the line inputs (single-ended or differential),
and the MIC inputs. Configure the mixer to mix any com-
bination of the available sources. When more than one
signal is selected, the mixer can be configured to attenu-
ate the signal by 6dB, 9dB, or 12dB. The stereo DAC
can bypass the headphone mixers, and be connected
directly to the headphone amplifiers to provide lower
power consumption.
Table 27. Headphone Output Mixer Register
REGISTER BIT NAME DESCRIPTION
0x25
7
MIXHPL
Left Headphone Output Mixer
1xxxxxxx = Right DAC
x1xxxxxx = MIC2
xx1xxxxx = MIC1
xxx1xxxx = INB2 (INBDIFF = 0) or INB2-INB1 (INADIFF = 1)
xxxx1xxx = INB1
xxxxx1xx = INA2 (INADIFF = 0) or INA2-INA1 (INADIFF = 1)
xxxxxx1x = INA1
xxxxxxx1 = Left DAC
6
5
4
3
2
1
0
0x26
7
MIXHPR
Right Headphone Output Mixer
1xxxxxxx = Left DAC
x1xxxxxx = MIC2
xx1xxxxx = MIC1
xxx1xxxx = INB2 (INBDIFF = 0) or INB2-INB1 (INBDIFF = 1)
xxxx1xxx = INB1
xxxxx1xx = INA2 (INADIFF = 0) or INA2-INA1 (INADIFF = 1)
xxxxxx1x = INA1
xxxxxxx1 = Right DAC
6
5
4
3
2
1
0
0x27
5
MIXHPR_ PATH
SEL
Right Headphone Mixer Path Select
0 = Directly connect to the right DAC (bypass right headphone output mixer)
1 = Right headphone output mixer
4
MIXHPL_ PATH
SEL
Left Headphone Mixer Path Select
0 = Directly connect to the left DAC (bypass left headphone output mixer)
1 = Left headphone output mixer
3
MIXHPR
_GAIN
Right Headphone Mixer Gain Select
00 = 0dB
01 = -6dB
10 = -9dB
11 = -12dB
2
1
MIXHPL
_GAIN
Left Headphone Mixer Gain Select
00 = 0dB
01 = -6dB
10 = -9dB
11 = -12dB
0