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MAX9880A Evaluation Kit

Evaluates: MAX9880A

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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

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

C Serial

Interface sections in the MAX9880A IC data sheet for addi-

tional SPI and I

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

Table 15. JU21 Function

Table 16. JU20 and JU27 Function

*Default position.

SHUNT POSITION U1 MCLK INPUT FREQUENCY

1-2 Connected to ground —

1-3 Connected to pin 10 (RMCK) of U11 MCLK = 256 x S/PDIF input sample rate

1-4* Connected to on-board crystal oscillator Y2 MCLK = 13MHz

1-5 Connected to pin 18 (FUNC2) of U12 MCLK = 256 x USB input sample rate

INTERFACE

SHUNT POSITION

DESCRIPTION

JU20 JU27

C/2-wire*

Pins 2-3 of each

row*

Not installed*

The U1 device’s I

C interface is connected to the EV kit’s I

C con-

trol bus.

SPI Not installed

Pins 2-3 of each

row

The U1 device’s SPI interface is connected to the EV kit’s SPI con-

trol bus.

SHUNT POSITION U1 SELECT PIN DESCRIPTION

Installed* Connected to ground U1 device interface = I

C/2-wire

Not installed Connected to DVDDIO through resistor R39 U1 device interface = SPI