Evaluates: MAX9617
MAX9617 Evaluation Kit
General Description
The MAX9617 evaluation kit (EV kit) provides a proven
design to evaluate the MAX9617 low-power, zero-drift
operational amplifier (op amp) in a 6-pin SC70 pack-
age. 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, zero drift,
input offset voltage, and rail-to-rail input/output stages
make this device ideal for a variety of low-frequen-
cy measurement applications. The component pads
accommodate 0805 packages, making them easy to
solder and replace. The MAX9617 EV kit comes with a
MAX9617AXT+ installed.
Features
S Accommodates Multiple Op-Amp Configurations
S Component Pads Allow for Sallen-Key Filter
S Rail-to-Rail Inputs/Outputs
S Accomodates Easy-to-Use 0805 Components
S Proven PCB Layout
S Fully Assembled and Tested
Ordering Information
Component List
Component Supplier
19-4938; Rev 0; 9/09
+Denotes lead(Pb)-free and RoHS compliant.
Note: Indicate that you are using the MAX9617 when contacting this component supplier.
PART TYPE
MAX9617EVKIT+ EV Kit
DESIGNATION QTY DESCRIPTION
C1, C3 2
0.1FF Q10%, 25V X7R ceramic
capacitors (0805)
Murata GRM21BR71E104K
C2, C4 2
4.7FF Q10%, 25V X5R ceramic
capacitors (0805)
Murata GRM21BR61E475K
C5–C10 0 Not installed, ceramic capaci-
tors (0805)
R1, R2 21kI Q1% resistors (0805)
R3, R4, R7 0Not installed, resistors (0805)
R5 1 10kI Q1% resistor (0805)
R6, R8 20I Q5% resistors (0805)
JU1, JU2, JU4 32-pin headers
SUPPLIER PHONE WEBSITE
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
DESIGNATION QTY DESCRIPTION
JU3, JU5 23-pin headers
TP1, TP3, TP5,
TP6, TP7 5Red multipurpose test points
TP2, TP4 2Black multipurpose test points
TP8 0 Not installed, miniature test
point
U1 1
Single low-power, rail-to-rail I/O
op amp (6 SC70)
Maxim MAX9617AXT+
— 5 Shunts
— 1 PCB: MAX9617 EVALUATION
KIT+
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
2 Maxim Integrated
Evaluates: MAX9617
MAX9617 Evaluation Kit
Table 1. MAX9617 EV Kit Jumper Descriptions (JU1–JU5)
Quick Start
Required Equipment
• MAX9617 EV kit
• +5V, 10mA DC power supply (PS1)
• Precision voltage source
• Digital multimeter (DMM)
Procedure
The MAX9617 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Verify that the jumpers are in their default position, as
shown in Table 1.
2) Connect the positive terminal of the +5V supply to
VDD (TP1) and the negative terminal to GND (TP2)
and VSS (TP3).
3) Connect the positive terminal of the precision voltage
source to INP (TP6). Connect the negative terminal of
the precision voltage source to GND (TP2 or TP4).
4) Connect INM (TP5) to GND.
5) Connect the DMM to monitor the voltage on OUTA
(TP7). With the 10kI feedback resistor (R5) and 1kI
series resistor (R1), the gain is +11 (noninverting con-
figuration).
6) Turn on the +5V power supply.
7) Apply 100mV from the precision voltage source.
Observe the output at OUTA (TP7) on the DMM.
OUTA should read approximately +1.1V.
8) Apply 400mV from the precision voltage source.
OUTA should read approximately +4.4V.
Detailed Description of Hardware
The MAX9617 EV kit provides a proven layout for the
MAX9617 low-power, zero-drift operational amplifier (op
amp). The MAX9617 is a single-supply op amp that is
ideal for buffering low-frequency sensor signals. The
Sallen-Key topology is easily accomplished by changing
and removing a few components. The Sallen-Key topol-
ogy is ideal for buffering and filtering sensor signals.
Various test points are included for easy evaluation.
The MAX9617 is a single-supply op amp whose primary
application is operating in the noninverting configuration;
however, the MAX9617 can operate with a dual supply
as long as the voltage across the VDD and GND pins of
the IC do not exceed the Absolute Maximum Ratings.
When operating with a single supply, short VSS to GND.
Op-Amp Configurations
The MAX9617 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.
*Default position.
JUMPER SHUNT POSITION DESCRIPTION
JU1
1-2* Connects IN- to R1. Also shorts capacitor C5.
Open Connects IN- to R1 through capacitor C5. When AC-coupling is desired, remove the shunt
and install capacitor C5.
JU2
1-2* Connects IN+ to JU3 position 1. Also shorts capacitor C6.
Open Connects IN+ to JU3 position 1 through capacitor C6. When AC-coupling is desired,
remove the shunt and install capacitor C6.
JU3 1-2* Connects IN+ to INP (TP6) through R2 and R8
2-3 Connects IN+ to GND through R2 and R8
JU4
1-2* Connects OUT to OUTA (TP7)
Open Connects OUT to OUTA (TP7) through capacitor C10. When AC-coupling is desired,
remove the shunt and install capacitor C10.
JU5 1-2* Always keep jumper in this position (normal operation)
2-3 Do not use this jumper position
3Maxim Integrated
Evaluates: MAX9617
MAX9617 Evaluation Kit
Noninverting Configuration
The MAX9617 EV kit comes preconfigured as a nonin-
verting amplifier. The gain is set by the ratio of R5 and
R1. The MAX9617 EV kit comes preconfigured for a gain
of 11. The output voltage for the noninverting configura-
tion is given by the equation below:
OUT INP
R5
V (1 ) V
R1
= +
Differential Amplifier
To configure the MAX9617 EV kit as a differential amplifi-
er, replace R1, R2, R3, and R5 with appropriate resistors.
When R1 = R2 and R3 = R5, the CMRR of the differential
amplifier is determined by the matching of the resistor
ratios R1/R2 and R3/R5.
OUT INP INM
V GAIN (V V )= −
where: R5 R3
GAIN R1 R2
= =
Sallen-Key Configuration
The Sallen-Key topology is ideal for filtering sensor
signals with a second-order filter and acting as a buf-
fer. Schematic complexity is reduced by combining the
filter and buffer operations. The MAX9617 EV kit can be
configured in a Sallen-Key topology by replacing and
populating a few components. The Sallen-Key topology
can be configured as a unity-gain buffer by replacing
R1 and R5 with 0I resistors. The signal is noninverting
and applied to INP. The filter component pads are R2,
R3, R4, and R8, where some have to be populated with
resistors and others with capacitors.
Lowpass Sallen-Key Filter: To configure the Sallen-Key
as a lowpass filter, populate the R2 and R8 pads with
resistors and populate the R3 and R4 pads with capaci-
tors. The corner frequency and Q are then given by:
cR2 R8 R3 R4
1
f2RRCC
=
π
R2 R8 R3 R4
R4 R2 R8
RRCC
QC (R R )
=
+
Highpass Sallen-Key Filter: To configure the Sallen-
Key as a highpass filter, populate the R3 and R4 pads
with resistors and populate the R2 and R8 pads with
capacitors. The corner frequency and Q are then given
by:
cR3 R4 R2 R8
1
f2RRCC
=
π
R3 R4 R2 R8
R3 R2 R8
RRCC
QR (C C )
=
+
Capacitive Loads
Some applications require driving large capacitive loads.
To improve the stability of the amplifier in such cases,
replace R6 with a suitable resistor value to improve
amplifier phase margin.
4 Maxim Integrated
Evaluates: MAX9617
MAX9617 Evaluation Kit
Figure 1. MAX9617 EV Kit Schematic
5Maxim Integrated
Evaluates: MAX9617
MAX9617 Evaluation Kit
Figure 2. MAX9617 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX9617 EV Kit PCB Layout—Component Side
Figure 4. MAX9617 EV Kit PCB Layout—Solder Side
1.0’’ 1.0’’
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
6 Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2009 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
Evaluates: MAX9617
MAX9617 Evaluation Kit
