MAX9613 Evaluation Kit

2 ______________________________________________________________________________________

Table 1. EV Kit Jumper Descriptions

(JU1, JU2)

Quick Start

Required Equipment

• MAX9613EVkit

• +5V,10mADCpowersupply(PS1)

• Precisionvoltagesource

• Digitalmultimeter(DMM)

Procedure

The EV kit is fully assembled and tested. Follow the steps

below to verify board operation:

1) Verify that jumpers JU1 and JU2 are in their default

positions, as shown in Table 1.

2) Connect the positive terminal of the +5V supply to the

VDD test point and the negative terminal to the GND

test point closest to VDD.

3) Connect the positive terminal of the precision voltage

source to the INP test point. Connect the negative

terminal of the precision voltage source to GND (GND

or INM test points).

4) Connect the DMM to monitor the voltage on the OUTA

test point. With the 10kI feedback resistor (R5) and

1kI series resistor (R1), the gain is +11 (noninverting

configuration).

5) Turn on the +5V power supply.

6) Apply 100mV from the precision voltage source.

Observe the output at OUTA on the DMM, which

should read approximately +1.1V.

7) Apply 400mV from the precision voltage source.

OUTA should read approximately +4.4V.

Detailed Description of Hardware

The MAX9613 EV kit provides a proven layout for the

MAX9613 low-power, MOS-input op amp. The device

is a single-supply op amp that is ideal for buffering

sensor signals. A Sallen-Key 2nd-order active filter, as

described in the Sallen-Key Configuration section, is

easily accomplished by changing and removing some

components. Various test points are included for easy

evaluation.

Op-Amp Configurations

The device is a single-supply op amp that is ideal for

differential sensing, noninverting amplification, buffering,

and filtering. A few common configurations are shown in

the next few sections.

Noninverting Configuration

The EV kit comes preconfigured as a noninverting ampli-

fier with a gain of +11. The gain is set by the ratio of R5

and R1 (Figure 1). For a voltage applied to the INP test

point, the output voltage for the noninverting configura-

tion is given by the equation below:

5

OUT

INP

1

R

V

1

V

R





= +









Differential Amplifier

To configure the EV kit as a differential amplifier, replace

*Default position.

Figure 1. Default Noninverting Configuration with Gain +11

JUMPER

SHUNT

POSITION

DESCRIPTION

JU1

1-2*

Connects the INM test point to

GND.

Open

Isolates the INM test point from

GND.

JU2

1-2*

Connects SHDN to VDD

(normal operation).

2-3

Connects SHDN to GND

(shutdown).

INP

OUTA

INM

R8

0I

R6

0I

1

3

JU1

4

R2

1kI

1%

R5

10kI

1%

R1

1kI

1%