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MAX98088 Evaluation Kit
S/PDIF Transceiver
The CS8427 S/PDIF transceiver serves as a format con-
verter between I 2 S and S/PDIF. Use this device to send
and receive digital audio over the optical connectors
(J5, J6).
When receiving S/PDIF data, the CS8427 outputs a
recovered master clock that is exactly 256 x f S , where
f S is the sample rate. This clock signal can be used to
clock the IC.
When transmitting S/PDIF data, the CS8427 requires a
master-clock input. If S/PDIF data is also being received,
the CS8427 uses this data to generate its own master
clock. If S/PDIF data is not being received, then the
CS8427 generates a master clock based on the LRCLK
signal being output by the IC. For proper transmit-only
operation, the IC must be configured in master mode.
USB Audio
The PCM2707 USB DAC generates I 2 S audio data from
a USB connection to the PC. The PCM2707 supports
standard class drivers that are included in most operat-
Table_1._Jumper_Selection
ing systems. As a result, no drivers are required for this
device. The PCM2707 appears as a sound card in the
PC and allows audio playback from the PC through the
IC. The PCM2707 also generates a master-clock signal
that can be used to clock the IC. The clock signal is 256
x f S .
Digital Microphone
The EV kit includes an on-board digital microphone
to demonstrate the digital microphone input. Install
shunts on jumpers JU27 and JU32 to enable the
microphone. When using the digital microphone, the
MIC1 analog microphone input cannot be used. If a
second digital microphone is added, then MIC2 is also
unavailable .
Jumper Selection
The EV kit includes 20 jumpers to adjust various hard-
ware configuration options. Table 1 describes all the
jumpers available on the EV kit.
JUMPER
JU12
JU13
JU14
JU15
JU16
JU17
JU19
JU20
JU22
JU27
JU28
JU30
JU32
SHUNT_POSITION
—
—
1-2*
Open
1-2*
Open
1-2*
Open
1-2*
Open
—
2-3*, 5-6*
Open
1-2*
Open
1-2
Open*
1-2*
Open
1-2
Open*
1-2
Open*
DESCRIPTION
See Table 2
See Table 3
Connects 1.8V to DVDD
Allows external powering of DVDD
Connects 1.8V to AVDD
Allows external powering of AVDD
Connects 1.8V to HPVDD
Allows external powering of HPVDD
Connects 3.3V to DVDDS1
Allows external powering of DVDDS1
See Table 3
Connects the on-board I 2 C master to the IC
Allows external control of the IC over I 2 C
Connects 3.3V to DVDDS2
Allows external powering of DVDDS2
Connects the digital microphone data output to the IC
Disconnects the digital microphone data output from the IC
Connects the MAX98088 interrupt output ( IRQ ) to the on-board microcontroller
Disconnects the MAX98088 interrupt output ( IRQ ) to the on-board microcontroller
Connects JACKSNS to MIC1 for jack detection
Disconnects JACKSNS from MIC1
Connects the digital microphone clock input to the IC
Disconnects the digital microphone clock input from the IC
________________________________________________________________________________________ _ 9
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