max98088 Maxim Integrated Products, Inc., max98088 Datasheet - Page 67
max98088
Manufacturer Part Number
max98088
Description
Stereo Audio Codec With Flexsound Technology
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX98088.pdf
(123 pages)
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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
67
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