Datasheet

MAX98089 Evaluation Kit (TQFN)
Evaluates: MAX98089 (TQFN)
10 _____________________________________________________________________________________
Table 1. Jumper Selection (continued)
Table 2. MAX98089 Clock Sources (JU12)
*Default position.
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/
PDIFaudio 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.
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.
*Default position.
JUMPER SHUNT POSITION DESCRIPTION
JU30
1-2
Connects JACKSNS to MIC1 for jack detection; ensure that a shunt is installed on
jumper JU40 for proper jack detection.
Open* Disconnects JACKSNS from MIC1
JU32
1-2 Connects the digital microphone clock input to the IC
Open* Disconnects the digital microphone clock input from the IC
JU34
1-2
Connects a 2.2kI resistor from MIC1N to ground for microphone biasing
Open* Disconnects MIC1N from ground
JU35
1-2
Connects a 2.2kI resistor from MIC2N to ground for microphone biasing
Open* Disconnects MIC2N from ground
JU36
1-2 Grounds MIC1N for single-ended operation on MIC1
Open* Enables differential operation on MIC1
JU37
1-2 Grounds MIC2N for single-ended operation on MIC2
Open* Enables differential operation on MIC2
JU40
1-2
Connects MIC1P to MICBIAS through a 2.2kI resistor
Open* Disconnects MIC1P from MICBIAS
JU41
1-2
Connects MIC2P to MICBIAS through a 2.2kI resistor
Open* Disconnects MIC2P from MICBIAS
JU42
1-2*
Allows software to sense that a voltage is applied to SPKVDD (through SPKVDD_
POWERED net driving the MAXQ2000)
Open Disconnects Q1 for accurate SPKVDD supply current measurement
SHUNT POSITION CLOCK SOURCE
1-2 Disabled
1-3 13MHz oscillator
1-4* Software-selected clock source