max98088 Maxim Integrated Products, Inc., max98088 Datasheet - Page 67

• Manufacturer Part Number: max98088
• Description: Stereo Audio Codec With Flexsound Technology
• Manufacturer: Maxim Integrated Products, Inc.

Table 3. Microphone Input Registers (continued)
Figure 7. Line Input Block Diagram
The device includes two sets of line inputs (Figure 7).
Each set can be configured as a stereo single-ended
input or as a mono differential input. Each input includes
adjustable gain to match a wide range of input signal
levels. If a custom gain is needed, the external gain
mode provides a trimmed feedback resistor. Set the gain
REGISTER
EXTMICN
EXTMICP
INA1/
INA2/
INB1
INB2
0x4A
INABYP
BIT
7
4
1
0
PGAINA:
+20dB TO -6dB
PGAINA:
+20dB TO -6dB
PGAINB:
+20dB TO -6dB
PGAINB:
+20dB TO -6dB
MIC2BYP
RECBYP
SPKBYP
INABYP
NAME
INADIFF
INBDIFF
INA_/EXTMIC_ to MIC1_ Bypass Switch
0 = Disabled
1 = Enabled
MIC1_ to MIC2_ Bypass Switch
0 = Disabled
1 = Enabled
See the Output Bypass Switches section.
Line Inputs
with FLEXSOUND Technology
by choosing the appropriate input resistor and using the
following formula:
The external gain mode also allows summing multiple
signals into a single input, by connecting multiple input
resistors as show in Figure 8, and inputting signals larger
than 1V
Figure 8. Summing Multiple Input Signals into INA/INB
INPUT 1
INPUT 2
INPUT 1
INPUT 2
RIGHT
RIGHT
Stereo Audio Codec
LEFT
LEFT
P-P
.
DESCRIPTION
AV
PGAIN
INA1/EXTMICP
INA2/EXTMICN
= 20 x log (20K/RIN)
VCM
VCM
20kI
20kI
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