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Evaluates: MAX11905

MAX11905 Differential Evaluation Kit

General Description of Software

The main window of the MAX11905 EV kit software con-

tains five tabs:

Configuration, Scope, DMM, Histogram,

and

FFT. The Configuration tab sheet provides control

to communicate with the ZedBoard, SPI, and the IC reg-

isters. The other four tabs are used for evaluating the IC’s

high-speed ADC.

Configuration Tab

When all connections are made on the system and are

fully powered, the

Configuration tab sheet displays the

correct IP address, port, and the lower status bar displays

as shown Figure 1. These are all indicators that the sys-

tem and GUI are ready for communication.

Before proceeding, connect the connector used on the

ZedBoard to either the FMC or PMOD connector on the

EV kit. If the FMC connector is used, all SCLK frequen-

cies are applicable. If the PMOD connector is used, the

maximum allowed frequency is 37.5MHz. For the

Clock

Source selection, the ZedBoard internal clock is always a

valid option. If the external clock is selected, an external

clock must be applied at the DCLK_IN SMA on the EV kit.

The

Sync-Out CLK (10MHz) checkbox is used to syn-

chronize the signal generator with a 10MHz input. See the

Sync Input and Sync Output section for more information.

Once the above configurations are completed, adjust to

the desired sampling rate, reference voltage, and number

of samples, and then click on the

Set button.

Also in this tab sheet are the IC register controls. The

Mode register is accessible using the controls on the

MAX11905 Mode Register Configuration group box

in the center, or the

Mode control on the right. All other

registers are read-only and are updated by clicking on

the appropriate

Read button. The first and second REF

must be shorted on the board to use the REF controls.

first REF BUF and second REF BUF are internally set to

the same value. The GUI forces these two controls to the

same value, regardless of the user’s choice.

The

Reset button resets the firmware, as well as the

device. It sends 0x8000 to the Mode register and causes

the device to do a power-on reset. The

Set button needs

to be clicked to save the current screen settings.

Figure 1. MAX11905 EV Kit Main Window (Configuration Tab)

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