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MAX98088 Evaluation Kit
Table_1._Jumper_Selection_(continued)
JUMPER
JU34
JU35
JU36
JU37
JU40
JU41
JU42
* Default position.
SHUNT_POSITION
1-2
Open*
1-2
Open*
1-2
Open*
1-2
Open*
1-2
Open*
1-2
Open*
1-2*
Open
DESCRIPTION
Connects a 2.2k I resistor from MIC1N to ground for microphone biasing
Disconnects MIC1N from ground
Connects a 2.2k I resistor from MIC2N to ground for microphone biasing
Disconnects MIC2N from ground
Grounds MIC1N for single-ended operation on MIC1
Enables differential operation on MIC1
Grounds MIC2N for single-ended operation on MIC2
Enables differential operation on MIC2
Connects MIC1P to MICBIAS through a 2.2k I resistor
Disconnects MIC1P from MICBIAS
Connects MIC2P to MICBIAS through a 2.2k I resistor
Disconnects MIC2P from MICBIAS
Allows software to sense that a voltage is applied to SPKVDD (through SPKVDD_
POWERED net driving the MAXQ2000)
Disconnects Q1 for accurate SPKVDD supply current measurement
Master Clock Selection
Jumper JU12 selects which master-clock source clocks
the IC. The available clocks are shown in Table 2. The
EV kit software indicates the correct clock source to use
depending on which audio source is in use. If an external
audio source is used, choose either the on-board 13MHz
oscillator or an external clock. To connect the external
clock, remove the shunt from JU12 and connect the
clock to the center pin.
Digital Audio Interface
Jumpers JU13 and JU19 provide access to the digital
audio interfaces on the IC. See Table 3 for individual pin
descriptions. When using the on-board USB and S/PDIF
audio sources, install shunts between pins 2-3 on each
row. When using an external audio source, remove the
shunts and connect the audio source clock and data
lines to position 2 of the header. Position 1 on each row
provides a convenient ground connection.
Table_2._MAX98088_Clock_Sources_(JU12)
Control Interface
Jumper JU20 connects the on-board I 2 C master to the
IC. When using an external I 2 C master, remove both
shunts from JU20 and connect position 1 to SDA and
SCL on the external I 2 C master. Install pullup resistors
at R15 and R16 if the external master does not include
pullup resistors.
Microphone Bias and Jack Sense
Jumpers JU34–JU37, JU40, and JU41 provide micro-
phone biasing on MIC1 and MIC2. To provide micro-
phone bias, install a shunt on JU40 and JU41. For single-
ended microphone inputs, install shunts on JU36 and
JU37. For differential microphone inputs, install shunts
on JU34 and JU35.
To enable microphone detection on MIC1, install a shunt
on JU30.
SHUNT_POSITION
1-2
1-3
1-4*
CLOCK_SOURCE
Disabled
13MHz oscillator
Software-selected clock source
* Default position.
10_ _ ______________________________________________________________________________________
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