19-5190; Rev 0; 3/10
MAX9613 Evaluation Kit
General Description
The MAX9613 evaluation kit (EV kit) provides a proven
design to evaluate the MAX9613 low-power, MOS-input
operational amplifier (op amp) in a 6-pin SC70 package.
The EV kit circuit is preconfigured as a noninverting
amplifier, but can easily be adapted to other topologies
by changing a few components. Low-power, low-input
Vos, and rail-to-rail input/output stages make this device
ideal for a variety of measurement applications. The
component pads accommodate 0805 packages, making
them easy to solder and replace. The EV kit comes with
a MAX9613AXT+ installed.
S
Rail-to-Rail Inputs/Outputs
S
Accomodates Easy-to-Use 0805 Components
S
Proven PCB Layout
S
Fully Assembled and Tested
Features
S
Accommodates Multiple Op-Amp Configurations
Evaluates: MAX9613
Component Pads Allow for Sallen-Key Filter
Ordering Information
PART
TYPE
MAX9613EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
0.1FF
Q10%,
16V X7R ceramic
capacitor (0603)
Murata GRM188R71C104K
4.7FF
Q10%,
6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
Not installed, ceramic capacitors
(0805)
Black multipurpose test points
White multipurpose test points
2-pin header
—
—
2
1
DESIGNATION
JU2
R1, R2
R5
R6, R8
VDD
QTY
1
2
1
2
1
DESCRIPTION
3-pin header
1kI
Q1%
resistors (0805)
10kI
Q1%
resistor (0805)
0I
Q5%
resistors (0805)
Red multipurpose test point
Single low-power, rail-to-rail I/O
op amp (6 SC70)
Maxim MAX9613AXT+
(Top Mark: +ADK)
Shunts
PCB: MAX9613 EVALUATION
KIT+
C2
1
C3, C4, C8, C9
GND
INM, INP, OUTA
JU1
0
2
3
1
U1
1
Component Supplier
SUPPLIER
PHONE
WEBSITE
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Note:
Indicate that you are using the MAX9613 when contacting this component supplier.
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX9613 Evaluation Kit
Evaluates: MAX9613
Quick Start
• MAX9613 EV kit
• Precision voltage source
• Digital multimeter (DMM)
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
7) Apply 400mV from the precision voltage source.
OUTA should read approximately +4.4V.
Required Equipment
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.
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:
R
V
OUT
=
1
+
5
V
INP
R
1
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
• +5V, 10mA DC power supply (PS1)
Procedure
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.
Op-Amp Configurations
Table 1. EV Kit Jumper Descriptions
(JU1, JU2)
JUMPER
SHUNT
POSITION
1-2*
JU1
Open
1-2*
JU2
2-3
*Default
position.
Figure 1. Default Noninverting Configuration with Gain +11
2
______________________________________________________________________________________
DESCRIPTION
Connects the INM test point to
GND.
Isolates the INM test point from
GND.
Connects
SHDN
to VDD
(normal operation).
Connects
SHDN
to GND
(shutdown).
JU1
INM
INP
R8
0I
R2
1kI
1%
1
4
3
R6
0I
OUTA
R1
1kI
1%
R5
10kI
1%
MAX9613 Evaluation Kit
Evaluates: MAX9613
ratio (CMRR) of the differential amplifier is determined
by the matching of the resistor ratios R5/R1 and R
C3
/R2
(Figure 2).
V
OUT
=
GAIN
(
V
INP
−
V
INM
)
where:
Lowpass Sallen-Key Filter
To configure the Sallen-Key as a lowpass filter, populate
the R2 and R8 pads with resistors, and populate the C3
and C4 pads with capacitors. The corner frequency and
Q are then given by (Figure 3):
ƒ
C
=
1
2
π
R2
×
C3
×
R8
×
C4
R2
×
C3
×
R8
×
C4
C3
(
R2
+
R8
)
R5 R
C3
GAIN
=
=
R1
R2
Q
=
INP
R8
0I
R2
1kI
1%
R
C3
10kI
1%
1
4
INM
3
R6
0I
OUTA
Highpass Sallen-Key Filter
To configure the Sallen-Key as a highpass filter, populate
the C3 and C4 pads with resistors, and populate the R2
and R8 pads with capacitors. The corner frequency and
Q are then given by (Figure 4):
ƒ
C
=
1
2
π
C
R8
×
R
C4
×
C
R2
×
R
C3
C
R8
×
R
C4
×
C
R2
×
R
C3
R
C4
(
C
R2
+
C
R8
)
R1
1kI
1%
R5
10kI
1%
Figure 2. Differential Configuration with Gain +10
Q
=
Sallen-Key Configuration
The Sallen-Key active filter topology is ideal for sensor
signal conditioning with a 2nd-order filter. These filters
benefit from a rail-to-rail input structure with no crossover
distortion, such as that available on the device.
Some applications require driving large capacitive loads.
To improve the stability of the amplifier in such cases,
either replace R6 with a suitable resistor value to improve
amplifier phase margin in the presence of capacitive
load C9, or apply a resistive load in parallel with C9.
Capacitive Loads
C4
4.7nF
C3
1nF
R
C4
R
C3
INP
INP
R8
2.74kI
R2
19.6kI
C
R8
C
R2
1
4
3
R6
0I
1
4
3
R6
0I
OUTA
OUTA
R5
0I
R5
0I
Figure 3. Lowpass 2nd-Order Filter Sallen-Key Configuration
for 10kHz
Figure 4. Generic 2nd-Order Highpass Sallen-Key Filter
_______________________________________________________________________________________
3
MAX9613 Evaluation Kit
Evaluates: MAX9613
Figure 5. MAX9613 EV Kit Schematic
4
______________________________________________________________________________________
MAX9613 Evaluation Kit
Evaluates: MAX9613
1.0’’
Figure 6. MAX9613 EV Kit Component Placement Guide—
Component Side
1.0’’
Figure 7. MAX9613 EV Kit PCB Layout—Component Side
1.0’’
Figure 8. MAX9613 EV Kit PCB Layout—Solder Side>
_______________________________________________________________________________________
5
实时操作系统RTOS
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
