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MAX9880A Evaluation Kit
Master Clock (MCLK)
The EV kit provides jumper JU12 to select the source of
the device’s master clock input (see Table 14). The MCLK
input can be connected to GND, RMCK, FUNC2, or the
on-board 13MHz crystal oscillator (Y2). When connected
to RMCK or FUNC2, the clock signal is provided by the
digital audio transceiver or the USB stereo audio DAC,
respectively.
Interface Configuration (JU21)
The U1 device is configured for I 2 C/2-wire or SPI operation
through jumper JU21 (see Table 15). Once the interface
mode is configured, the shunts on headers JU20 and JU27
need to be configured, as shown in Table 16. Note that
the JU20 and JU27 headers should be configured in an
exclusive-or manner (i.e., only one header is shunted at a
time). Once all three headers are properly configured, the
PC-based EV kit software can be used to configure and
control the device. See the Detailed Description of Software
section.
Refer to the Serial Peripheral Interface (SPI) and I 2 C Serial
Interface sections in the MAX9880A IC data sheet for addi-
tional SPI and I 2 C details.
Microphone Inputs
The U1 device can be evaluated with digital microphones
and/or analog microphones. The EV kit provides the capa-
bility to evaluate the device with only digital microphones,
only analog microphones, or a combination of both types
(see Table 17). The left analog microphone connects
across the MICLN and MICLP pads and the right analog
microphone connects across the MICRN and MICRP pads.
Both single-ended and differential analog microphones
can be used with the EV kit (see Table 18). Two digital
microphones (U15, U16) are included on the EV kit and are
connected to the device’s left microphone inputs (MICLN,
MICLP) through jumpers JU8 and JU9.
Microphone Bias (JU3, JU4)
The U1 device’s microphone bias (MICBIAS) output can be
used to power two external analog microphones by install-
ing shunts on jumpers JU3 and JU4. If digital microphones
are used remove the shunt from jumper JU4.
When using the digital microphones, remove the shunts
from jumpers JU5 and JU6 and leave the left microphone
input pads (MICLN, MICLP) unconnected. Similarly, when
using the SPDM output, remove the shunts from jumpers
JU1 and JU2 and leave the right microphone input pads
(MICRN, MICRP) unconnected. See the SPDM Output
section.
Table 14. JU12 Function
SHUNT POSITION
1-2
1-3
1-4*
1-5
U1 MCLK INPUT
Connected to ground
Connected to pin 10 (RMCK) of U11
Connected to on-board crystal oscillator Y2
Connected to pin 18 (FUNC2) of U12
FREQUENCY
—
MCLK = 256 x S/PDIF input sample rate
MCLK = 13MHz
MCLK = 256 x USB input sample rate
* Default position.
Table 15. JU21 Function
SHUNT POSITION
Installed*
Not installed
U1 SELECT PIN
Connected to ground
Connected to DVDDIO through resistor R39
DESCRIPTION
U1 device interface = I 2 C/2-wire
U1 device interface = SPI
* Default position.
Table 16. JU20 and JU27 Function
U1
INTERFACE
SHUNT POSITION
JU20 JU27
DESCRIPTION
I 2 C/2-wire*
SPI
Pins 2-3 of each
row*
Not installed
Not installed*
Pins 2-3 of each
row
The U1 device’s I 2 C interface is connected to the EV kit’s I 2 C con-
trol bus.
The U1 device’s SPI interface is connected to the EV kit’s SPI con-
trol bus.
* Default position.
24
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