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MAX98088 Evaluation Kit
Global Control Buttons
Buttons at the top of the EV kit software window control
the connection and synchronization of the software with
the IC.
Press Reset to restore the EV kit to power-on default set-
tings. Uncheck options that need not be reset.
Press Connect to reconnect to the EV kit after the soft-
ware is started. The Connect button is disabled when
the software is already connected to the EV kit. The
Connect_ button is used primarily if the EV kit is con-
nected to the PC after the software is already running.
File Menu
The EV kit software can save its state to a configuration
file for loading at a later time. Select the Save_Settings
menu item from the File menu bar to save the current
configuration. A Save_As dialog box appears to allow the
location for the saved file to be selected. Files are saved
with the extension .ax26.
Select Load_Settings to revert to a saved configuration.
An Open dialog box appears to allow the location of
the saved configuration file to be specified. The default
directory lists several presaved options. Alternatively,
.ax26 files are associated with the EV kit software.
Double click on a saved file to launch the EV kit software
and load the saved configuration.
Select Exit to exit the software.
View Menu
The Show_ S/PDIF_ Transceiver_ Registers menu item
under the View menu bar displays a new tab sheet for
manually controlling the CS8427.
Options Menu
When the Auto_Connect menu item is selected from the
Options menu bar, the software automatically connects
to the EV kit board as soon as the connection is avail-
able.
When Auto_Read_Status is selected, the software auto-
matically reads the device registers every 1000ms.
The I2C_Clock_Speed submenu item selects the speed
of the I 2 C interface as either 400kHz or 100kHz.
Configure_MCLK_Routing selects which clock source is
connected to the IC.
Tools Menu
Select the Debug_ Tools menu item under the Tools_
menu bar to directly send I 2 C commands to the EV kit.
Select Read_ All_ Registers to update the software set-
tings with the register settings of the connected EV kit.
This option is useful if the EV kit software is restarted
without power cycling the EV kit.
Select Write_All_Registers to download all software set-
tings to the connected EV kit. This option is useful when
power has been removed from the IC. Pressing the Write_
All_ Registers button is only necessary when the IC’s
entire register bank needs updating. Individual register
changes are made automatically.
Detailed Description of Hardware
The MAX98088 EV kit evaluates the MAX98088 audio
codec and provides access to all analog and digital
inputs/outputs on the device. In addition, the EV kit
includes support circuitry that eases evaluation of the
device.
Power Supplies
The EV kit requires a single 2.8V to 5.5V external supply
to operate. For evaluation other than power consump-
tion, all other supplies are generated from USB bus
power. Jumpers JU14–JU17, and JU22 (see Table 1)
allow all supplies on the IC to be disconnected from USB
bus power and powered externally. This allows varying
the supply voltage and performing supply current mea-
surements.
Class D Filters
The IC integrates stereo Class D amplifiers. Although
these amplifiers are designed to operate completely fil-
terless, filters are often helpful during evaluation. Stuffing
options for two types of filters are provided on the EV kit.
When long speaker cables are used with the IC, a
ferrite bead plus capacitor filter can be installed to
prevent excessive EMI radiation. Although it is best to
choose filter components based on EMI test results,
the combination of a 680pF capacitor with the Murata
BLM18SG331TN1 ferrite bead generally works well.
To allow analysis of the audio output with an oscillo-
scope, or an analyzer not designed to accept Cass D
switching waveforms, populate L2–L5 with the included
22 F H inductors and make connections to external equip-
ment and speakers at FSPKLP, FSPKLN, FSPKRP, and
FSPKRN. The LC filter is designed to work best with an
8ω load. Do not connect the load at SPKLP, SPKLN,
SPKRP, and SPKRN when L2–L5 are installed.
Select Export_Register_Setup File to export the value of
all registers set to a nondefault setting.
8_ _ _______________________________________________________________________________________
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