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MAX9880A Evaluation Kit
SPDM Output
The U1 device provides an SPDM output by retask-
ing the MICRN and MICRP device pins. This feature
is selectable through I 2 C and is accessed through the
SPDM blocks on the Digital Audio tab. When utilizing
the SPDM output, the MICRN and MICRP pads cannot
be used for microphone input and shunts should be
removed from jumpers JU1 and JU2.
To access the SPDM output signals, shunts must be
installed on jumpers JU18 and JU24. This configuration
connects the SPDM output (SPDMDATA, SPDMCLK) to
the DSD_DATA and DSD_CLK pads.
JACKSNS/AUX
The U1 device’s JACKSNS/AUX pin has dual functional-
ity, allowing it to be used as an input for jack detection,
or as an input for measuring DC voltages.
Jack Detection (JACKSNS)
To utilize this feature, configure jumper JU7 according to
Table 19, disable the AUX block on the Analog Audio
tab, and refer to the Mode Configuration section in the
MAX9880A IC data sheet for additional details and con-
figuration options. Once the EV kit is configured for jack
detection, there is one of three methods for utilizing this
feature: through the JACKSNS pad, through the J3 head-
phone jack, or through the MICLP pad, which requires
that a shunt be installed on jumper JU29.
Table 17. M icrophon e Input Configuration
SHUNT POSITION
JU8 JU9
MICROPHONE INPUTS
DESCRIPTION
Not installed
Installed
Installed
Not installed
installed
Installed
Two analog microphones*
Two digital microphones
Analog and digital micro-
phones
Analog microphones connected across MICLN, MICLP,
MICRN, and MICRP pads.
On-board digital microphones (U15 and U16) connected to
device’s left microphone inputs.
On-board digital microphones (U15 and U16) connected to
left microphone inputs and analog microphone connected
across MICRN and MICRP pads.
* Default position.
Table 18. Analog Microphone Configuration
ANALOG MICROPHONE
JU1
JU2
SHUNT POSITION
JU5 JU6
JU3
JU4
Single-ended (without MICBIAS)
Single-ended (with MICBIAS)
Differential (without MICBIAS)
Differential (with MICBIAS)
X
X
Installed
Installed
Installed
Not installed
Not installed
Not installed
Installed
Not installed
Not installed
Not installed
X
X
Installed
Installed
Not installed
Installed
Not installed
Installed
Not installed
Installed
Not installed
Installed
X = Don’t care.
Table 19. JU7 Functio n
SHUNT POSITION
Installed
Not installed*
* Default position.
U1 JACKSNS/AUX PIN
Connected to the JACKSNS pad
Connected to the AUX pad through resistor-dividers R5
(10k I ) and R6 (10k I )
MODE
Jack detection
DC voltage measurements
______________________________________________________________________________________
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