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Evaluate: MAX1284

MAX1284 Evaluation Kit/Evaluation System

______________________________________________________________________________________________________________________________________________________________________________

J1-1

GND

J1-2

JU2

J1-3

J1-4

J1-7

J1-8

VDD

0.1µF

4.7µF

10µF

0.1µF

0.01µF

AIN

VREF

(2.5V NOMINAL)

AIN

GND

REF

VDD

J1-28

J1-30

SCLK

UPSHDN

SHDN

J1-33

JU1

J1-34

DOUT

SCLK

SHDN

J1-35

J1-37

DOUT

SCLK

J1-38

TP1-1

TP1-2

TP1-3

TP1-4

TP1-5

TP1-6

GND

VDD

SHDN

DOUT

SCLK

MAX1284

J1-25

J1-26

J1-27

J1-29

J1-31

J1-32

J1-19

J1-20

J1-21

J1-22

J1-23

J1-24

J1-36

J1-13

J1-14

J1-15

J1-16

J1-17

J1-18

J1-40

J1-5

J1-6

J1-9

J1-10

J1-11

J1-12

J1-39

Figure 1. MAX1284 EV Kit Schematic Diagram

Detailed Description

MAX1284 Stand-Alone EV Kit

The MAX1284 EV kit provides a proven PCB layout to

evaluate the MAX1284. It must be interfaced to appropri-

ate timing signals for proper operation. Connect +5V to

VDD, and connect the ground return to GND (Figure 1).

Refer to the MAX1284 data sheet for timing requirements.

MAX1284 EV System

The MAX1284 EV system operates from a user-sup-

plied +7VDC to +20VDC power supply. Windows

98/2000/XP-compatible software running on a PC inter-

faces to the EV system board through the computer’s

serial communications port. See the

Quick Start

section

for setup and operating instructions.

Description of Software

The evaluation software’s main window controls the

serial-clock speed and sample rate. It displays the volt-

age and output code as well as some statistics of the

input signal. A separate graph window shows the data

changing in real time. The update rate is limited to

about 10 samples per second, due to COM port band-

width limitations.

Statistics

The Minimum and Maximum fields show the highest

and lowest readings acquired. The Average field shows

a running mean based on the equation a

= (k)(x

) +

(1 - k)(a

i - 1

). The Clear button resets the statistics. To

remove offset errors, first apply 0V to the active input

channel, clear statistics, acquire some samples, and then

check Tare. This average offset voltage will now be sub-

tracted from all subsequent measurements.

1 2 3 4 5 6

Evaluate: MAX1284 1

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