Datasheet

MAX9613 Evaluation Kit
Evaluates: MAX9613
2 ______________________________________________________________________________________
Table 1. EV Kit Jumper Descriptions
(JU1, JU2)
Quick Start
Required Equipment
• MAX9613EVkit
• +5V,10mADCpowersupply(PS1)
• Precisionvoltagesource
• Digitalmultimeter(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
R1, R2, R
C3
, and R5 with appropriate resistors. When
R1 = R2 and R5 = R
C3
, the common-mode rejection
*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%