Datasheet

MAX9880A Evaluation Kit
Evaluates: MAX9880A
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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. Microphone Input Configuration
Table 18. Analog Microphone Configuration
*Default position.
X = Don’t care.
Table 19. JU7 Function
*Default position.
SHUNT POSITION
MICROPHONE INPUTS DESCRIPTION
JU8 JU9
Not installed Not installed Two analog microphones*
Analog microphones connected across MICLN, MICLP,
MICRN, and MICRP pads.
Installed installed Two digital microphones
On-board digital microphones (U15 and U16) connected to
device’s left microphone inputs.
Installed Installed
Analog and digital micro-
phones
On-board digital microphones (U15 and U16) connected to
left microphone inputs and analog microphone connected
across MICRN and MICRP pads.
ANALOG MICROPHONE
SHUNT POSITION
JU1 JU2 JU5 JU6 JU3 JU4
Single-ended (without MICBIAS) X Installed Installed X Not installed Not installed
Single-ended (with MICBIAS) X Not installed Not installed X Installed Installed
Differential (without MICBIAS) Installed Not installed Not installed Installed Not installed Not installed
Differential (with MICBIAS) Installed Not installed Not installed Installed Installed Installed
SHUNT POSITION U1 JACKSNS/AUX PIN MODE
Installed Connected to the JACKSNS pad Jack detection
Not installed*
Connected to the AUX pad through resistor-dividers R5
(10kI) and R6 (10kI)
DC voltage measurements