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Evaluate: MAX1272/MAX1273

MAX1272 Evaluation Kit/Evaluation System

4 _______________________________________________________________________________________

12345 6

VDD

TP1

J1-38

J1-37

J1-36

J1-35

TB0

1µF

GND

AIN

VDD

1µF

0.1µF

MAX1272

SCLK

DIN

DOUT

REF

AIN

GND

J1-1

J1-2

J1-3

J1-4

J1-7

J1-8

VDD

Figure 2. MAX1272 EV Kit Schematic

Statistics

The Minimum and Maximum fields in the statistics area

show the highest and lowest readings acquired. The

Average field shows a running mean. When reading

data manually by pressing the Read button, the

Average and RMS fields require approximately five

samples until they are accurately represented. The

Clear Statistics button resets the statistics. To remove

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

press the Clear Statistics button, acquire some sam-

ples, and then check the Null Offset checkbox. Once

checked, the label next to the Null Offset checkbox

shows the sampled offset error. This value is subtracted

from all subsequent measurements until the checkbox

is unchecked.

Reference Voltage

The evaluation software assumes a +4.096V reference

voltage, unless otherwise specified. To override the

+4.096V reference value, apply the new reference volt-

age at the terminal block (TB0) on the board, type in

the new reference voltage (without the volt unit), and

press the Set V

ref

button.

Detailed Description

of Hardware

The MAX1272 is a 12-bit, multirange, serial ADC. When

the MAX1272EVKIT board is connected to the

68HC16MODULE-DIP module, power is provided by the

module. See Figure 2 (MAX1272 EV Kit Schematic).

The MAX1272 has a software-selectable internal

+4.096V reference. The terminal block (TB0) on the

MAX1272EVKIT board is for applications requiring an

external reference.

Evaluating the MAX1273

The MAX1272EVKIT board can also be used to evalu-

ate the MAX1273. The MAX1272 and the MAX1273 dif-

fer only in analog input voltage range. The MAX1272

has a software-selectable input voltage range of 0 to

+5V, 0 to +10V, ±5V and ±10V. The MAX1273 has a

software-selectable input voltage range of 0 to V

REF

/ 2,

0 to V

REF

, ±V

REF

/ 2, and ±V

REF

. Simply replace the

MAX1272CPA with the MAX1273CPA.

1 2 3 4 5

Evaluate: MAX1272/MAX1273 1

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Maxim USBTO232 Guía de usuario Pagina 4

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