MAX19527 Evaluation Kit

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Keyboard Navigation

Press Ctrl + Tab to navigate to the tab sheets. The

selected tab sheet is indicated by a dotted outline. Press

the Tab key to select each GUI control. The selected

control is indicated by a dotted outline. Using Shift +

Tab moves the selection to the previously selected con-

trol. Buttons respond to the keyboard's space bar and

some controls respond to the keyboard's up and down

arrow keys. Activate the program's menu bar by press-

ing the F10 key and then press the letter of the desired

menu item. Most menu items have one letter underlined,

indicating their shortcut key.

When a number is entered into the edit boxes, it can be

sent to the device by pressing the Enter key. The data is

also sent when Tab or Shift + Tab is pressed.

Detailed Description of Hardware

The MAX19527 EV kit is a fully assembled and tested

circuit board that contains all the components necessary

to evaluate the performance of the MAX19527 50Msps

octal, 12-bit ADC.

The ADC accepts differential input signals; however,

on-board transformers (T1–T8) convert the single-ended

signals applied to the IN1–IN8 SMA connectors to the

required differential signals. The input signals of the

ADC can be measured using a differential oscilloscope

probe at header J1. The ADC’s digital LVDS output

signals are accessible at header H2. Output drivers

(U4, U5, and U6) are used for buffering the LVDS output

signals when interfacing the EV kit to the DCEP board.

The EV kit can be configured for communicating to the

SPI interface using the on-board USB circuitry or a user-

supplied external 3-wire controller using jumpers JU11

JU12, and JU13.

The EV kit is designed as a six-layer PCB to optimize the

performance of the ADC. Separate analog, digital, and

buffer power planes minimize noise coupling between

analog and digital signals. The analog and clock inputs

and the LVDS outputs use 100I differential microstrip

transmission lines. All singled-ended digital outputs use

50I microstrip transmission lines. The trace lengths of

the 100I differential LVDS output lines are matched to

within a few thousands of an inch to minimize layout-

dependent output-signal skew.

Power Supplies

The EV kit operates from a single 3.3V DC power supply

applied at the +3.3V and GND PCB pads and provides

on-board regulation to power the IC analog and digital

circuit blocks, and the MAX9392 LVDS buffers.

The analog circuit block (AVDD) is regulated to 1.8V

using the MAX8902A (U2). To power the analog circuit

using the EV kit circuitry, install a shunt on jumper JU14.

To disconnect the 1.8V power source, remove the shunt

at JU14. See Table 3 for proper JU14 configuration.

The digital circuit block (OVDD) is regulated to 1.8V

using the MAX8902A (U3). To power the digital circuit

using the EV kit circuitry, install a shunt on jumper JU15.

To disconnect the 1.8V power source from OVDD,

remove the shunt on JU15. See Table 4 for proper JU15

configuration.

Jumpers JU14 and JU15 are provided to disconnect the

power sources or to measure current through AVDD and

OVDD, respectively.

Clock Input

The data converter allows either differential or single-

ended signals to drive the clock inputs. The EV kit

supports both methods.

In single-ended operation, the clock signal is applied

at the CLK SMA connector and connects to the ADC

through a buffer (U7). In differential mode, an on-board

transformer converts a user-supplied single-ended

analog input and generates a differential analog signal,

which is then applied to the ADC’s input pins. The clock

signal applied to the ADC can be observed at header J2.

Table_3._AVDD_Input_Power_Configuration_

(JU14)

Table_4._OVDD_Input_Power_Configuration_

(JU15)

*Default position.

*Default position.

SHUNT_POSITION

AVDD_(V)

Installed*

1.8V LDO (U2) powers the AVDD

input

Not installed

Power disconnected from the

AVDD input

SHUNT_POSITION

OVDD_(V)

Installed*

1.8V LDO (U3) powers the OVDD

input

Not installed

Power disconnected from the

OVDD input