Rainbow Electronics MAX98089 - Manual (Page 72)

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MAX98089
Low-Power, Stereo Audio Codec
with FlexSound Technology
ADC Input Mixers
The IC’s stereo ADC accepts input from the microphone
amplifiers, line inputs amplifiers, and directly from the
INA1 and INA2. The ADC mixer routes any combina-
tion of the eight audio inputs to the left and right ADCs
(Figure 9).
Table 4. Line Input Registers
Figure 9. ADC Input Mixer Block Diagram
INBDIFF
PGAINB:
+20dB TO -6dB
+
PGAINB:
+20dB TO -6dB
INADIFF
PGAINA:
+20dB TO -6dB
+
PGAINA:
+20dB TO -6dB
PGAM2:
+20dB TO 0dB
PGAM1:
+20dB TO 0dB
MIXADR
ADREN
ADLEN
MIX
MIXADL
MIX
PA2EN:
0/20/30dB
PA1EN:
0/20/30dB
ADCR
ADCL
REGISTER BIT NAME DESCRIPTION
0x37/0x38
6 INAEXT/INBEXT
Line Input A/B External Gain
Switches out the internal input resistor and selects a trimmed 20kI feedback resistor.
Use an external input resistor to set the gain of the line input.
0 = Disabled
1 = Enabled
2
PGAINA/PGAINB
Line Input A/B Internal Gain Settings
000 = +20dB
001 = +14dB
010 = +3dB
011 = 0dB
100 = -3dB
101 = -6dB
110 = -6dB
111 = -6dB
1
0
0x47
7 INADIFF
Line Input A Differential Enable
0 = Stereo single-ended input
1 = Mono differential input
6 INBDIFF
Line Input B Differential Enable
0 = Stereo single-ended input
1 = Mono differential input