max98089 Maxim Integrated Products, Inc., max98089 Datasheet - Page 71

• Manufacturer Part Number: max98089
• Description: Low-power, Stereo Audio Codec With Flexsound Technology
• Manufacturer: Maxim Integrated Products, Inc.

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
Table 3. Microphone Input Registers (continued)
Figure 7. Line Input Block Diagram
REGISTER
EXTMICP
EXTMICN
INA1/
INA2/
INB1
INB2
0x4A
INABYP
BIT
7
4
1
0
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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
Low-Power, Stereo Audio Codec
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/or inputting signals
larger than 1V
less than 1.
Figure 8. Summing Multiple Input Signals into INA/INB
INPUT 1
INPUT 2
INPUT 1
INPUT 2
RIGHT
RIGHT
LEFT
LEFT
DESCRIPTION
AV
P-P
PGAIN
by adjusting the ration of the 20kI/R
INA1/EXTMICP
INA2/EXTMICN
= 20 x log (20kI/R
VCM
VCM
MAX98089
20kI
20kI
IN
)
1V
1V
P-P
P-P
(max)
(max)
IN