Datasheet
MAX9880A Evaluation Kit
Evaluates: MAX9880A
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Digital Audio Interfaces (S1, S2)
The two digital audio interfaces (S1, S2) of the U1 device
are routed through headers JU13 and JU19 to the on-
board digital audio transceiver (U11) and USB stereo
audio DAC (U12), respectively (see Tables 24 and 25).
Place shunts across all 2-3 positions to connect the U1
device’s S1 and S2 interfaces to the listed U11 and U12
interfaces.
Digital Audio Transceiver (U11)
The digital audio transceiver connects to TOSLINK con-
nectors J5 and J6 for audio input and output. The device
is operated in software mode (HS pin tied low) and is
connected to the U1 device’s S1 digital audio interface.
The audio transceiver is also interfaced to the EV kit’s SPI
control bus and is selected by the CS1 chip select line.
See the S/PDIF Audio section.To manually configure the
device’s registers, select the Show S/PDIF Transceiver
Registers item from the View drop-down menu. This
enables the CS8427 tab, which functions in the same
manner as the Control Registers tab. When the U11
device is enabled, the Read All button also reads all the
U11 registers and updates the CS8427 tab.
USB Stereo Audio DAC (U12)
The USB stereo audio DAC connects to the mini-USB
connector J10 for audio input. The audio DAC uses a
standard Windows class driver, and when connected to
a PC it is recognized as an external sound card, allow-
ing audio from a PC to be played through the EV kit. This
audio path is configured and enabled by selecting the
USB block on the Digital Audio tab. See the USB Audio
section.
Table 23. JU14–JU17 and JU22 Functions
Table 24. S1 Interface Header (JU13) Table 25. S2 Interface Header (JU19)
*Connects to DVDDS1.
**Default position.
*Signals are routed from the U4 level translator.
Table 22. JU10 and JU11 Function
*Default position.
SHUNT
POSITION
HEADPHONE MODE
Installed Single-ended (clickless)
Not installed*
Differential, capacitorless, or single-ended
(fast turn-on)
SHUNT POSITION
DVDD
(JU14)
MICVDD
(JU22)
PVDD
(JU16)
AVDD
(JU15)
DVDDIO*
(JU17)
Installed** 1.8V 1.8V 1.8V 1.8V 3.3V
Not installed Connect an external supply across their respective pads and ground.
JU13
POSITION 1
(LEFT)
POSITION 2
(CENTER)
POSITION 3
(RIGHT)
GND DACIN1 U11_DAC
GND ADCOUT1 U11_ADC
GND LRCLK1 U11_LRCLK
GND BCLK1 U11_BCLK
JU19
POSITION 1
(LEFT)
POSITION 2
(CENTER)
POSITION 3*
(RIGHT)
GND DACIN2 U12_DAC
GND ADCOUT2 U12_ADC
GND LRCLK2 U12_LRCLK
GND BCLK2 U12_BCLK