MAX40006 Evaluation Kit
Evaluates: MAX40006
General Description
The MAX40006 evaluation kit (EV kit) provides a proven
design to evaluate the MAX40006 low-power, MOS-input
operational amplifier (op amp) in a 6-bump wafer-level
package (WLP). 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 V
OS
, and rail-to-rail input/output stages make
this device ideal for a variety of measurement applications.
The component pads accommodate packages, making
them easy to solder and replace. The EV kit comes with a
MAX40006ANT+ installed.
Quick Start
Required Equipment
● MAX40006 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 the jumpers are in their default positions, as
shown in
Table 1.
2) Connect the positive terminal of the +5V supply to the
V
DD
PCB pad and the negative terminal to the GND
PCB pad closest to V
DD
.
3) Connect the positive terminal of the precision voltage
source to the IN+ PCB pad. Connect the negative
terminal of the precision voltage source to GND (GND
or IN- PCB pads).
4) Connect the DMM to monitor the voltage on the OUT
PCB pad. With the 10kΩ feedback resistor (R5) and
1kΩ 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 OUT on the DMM. OUT should
read approximately +1.1V.
7) Apply 400mV from the precision voltage source. OUT
should read approximately +4.4V.
Features
● +1.7V to +5.5V Supply Voltage Range
● Accommodates Multiple Op-Amp Configurations
● Component Pads Allow for Sallen-Key Filter
● Rail-to-Rail Inputs/Outputs
● Proven PCB Layout
● Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
19-8683; Rev 0; 10/16
MAX40006 Evaluation Kit
Evaluates: MAX40006
Detailed Description of Hardware
Sallen-Key Configuration
The Sallen-Key topology is ideal for filtering sensor signals
with a 2nd-order filter and acting as a buffer. Schematic
complexity is reduced by combining the filter and buffer
operations. The EV kit can be configured in a Sallen-Key
topology by replacing and populating a few components.
The Sallen-Key topology is typically configured as a unity-
gain buffer, which can be done by replacing R1 and R5
with 0Ω resistors. The signal is noninverting and applied
to IN+. The filter component pads are R2, R3, R4, and
R8, where some have to be populated with resistors and
others with capacitors.
The MAX40006 EV kit provides a proven layout for the
MAX40006 low-power, MOS-input op amp. The device is
a single-supply op amp that is ideal for buffering sensor
signals. The Sallen-Key topology is easily accomplished
by changing and removing some components. The
Sallen-Key topology is ideal for buffering and filtering
sensor signals.
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 detailed in
the next few sections.
Lowpass Sallen-Key Filter
To configure the Sallen-Key as a lowpass filter, populate
the R2 and R8 pads with resistors and the C3 and C4
pads with capacitors. The corner frequency and Q are
then given by:
f
C
=
1
2
π
R2
×
C3
×
R8
×
C4
R2
×
C3
×
R8
×
C4
C4(R2
+
R8)
Noninverting Configuration
The EV kit comes preconfigured as a noninverting amplifier.
The gain is set by the ratio of R5/R1. The EV kit comes
preconfigured for a gain of +11. For a voltage applied to
the IN+ PCB pad, the output voltage for the noninverting
configuration is given by the equation below:
R5
V
OUT
=
(V
IN
+
+
V
OS
)
1
+
R1
where V
OS
= Input-referred offset voltage.
Q
=
Highpass Sallen-Key Filter
To configure the Sallen-Key as a highpass filter, populate
the C3 and C4 pads with resistors and the R2 and R8
pads with capacitors. The corner frequency and Q are
then given by:
f
C
=
1
2
π
C
R8
×
R
C4
×
C
R2
×
R
C3
C
R8
×
R
C4
×
C
R2
×
R
C3
R
R3
(C
R2
+
C
R8
)
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 R
C3
= R5, the CMRR of the differential
amplifier is determined by the matching of resistor ratios
R1/R2 and R
C3
/R5:
R5
V
OUT
V
OS
=
Gain (V
IN
+
−
V
IN
−
)
+
1
+
R1
where:
Gain
=
R5 R
C3
=
R1
R2
Q
=
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 in the presence of the capacitive load (C9),
or apply a resistive load in parallel with C9.
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MAX40006 Evaluation Kit
Evaluates: MAX40006
Table 1. Jumper Descriptions (JU1, JU2)
JUMPER
JU1
JU2
JU3
JU4
*Default
position.
SHUNT POSITION
Installed*
Not installed
1-2*
2-3
Installed
Not installed*
Installed*
Not installed
DESCRIPTION
Connects the IN- PCB pad to GND.
Isolates the IN- PCB pad from GND.
Connects
SHDN
to V
DD
(normal operation).
Connects
SHDN
to GND (shutdown).
Connects the IN+ PCB pad to GND.
Isolates the IN+ PCB pad from GND.
Connects V
SS
to GND.
Isolates V
SS
from GND.
Ordering Information
PART
MAX40006EVKIT#
#Denotes
RoHS compliant.
TYPE
EV Kit
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Maxim Integrated │
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MAX40006 Evaluation Kit
Evaluates: MAX40006
MAX40006 EV Kit Bill of Materials
PART
C1, C17
QTY
2
2
2
3
1
3
2
1
2
3
1
1
0
0
1
DESCRIPTION
CAPACITOR; SMT (0402); CERAMIC CHIP; 0.1UF; 25V; TOL=10%; MODEL=C SERIES; TG=-55
DEGC TO +125 DEGC; TC=X7R
CAPACITOR; SMT (0603); CERAMIC CHIP; 4.7UF; 10V; TOL=10%; TG=-55 DEGC TO +125 DEGC;
TC=X7S
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.35IN; BOARD HOLE=0.063IN; WHITE; PHOS-
PHOR BRONZE WIRE SILVER PLATE FINISH;
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT THROUGH; 2PINS; -65 DEGC
TO +125 DEGC
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; 3PINS
TESTPOINT WITH 1.80MM HOLE DIA, RED, MULTIPURPOSE;
RESISTOR; 0402; 1K OHM; 1%; 100PPM; 0.063W; THICK FILM
RESISTOR; 0402; 10K OHM; 1%; 100PPM; 0.063W; THICK FILM
RESISTOR; 0402; 0 OHM; 0%; JUMPER; 0.10W; THICK FILM
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; BLACK; PHOS-
PHOR BRONZE WIRE SILVER PLATE FINISH;
EVKIT PART-IC; MAX40006ANT; OZ25; 4UA OPAMP WITH SHUT-DOWN; PACKAGE OUTLINE:
21-100086; PACKAGE CODE: N60D1-1; WLP6
C2, C18
IN+, IN-
JU1, JU3, JU4
JU2
OUT, VDD, OUT
R1, R2
R5
R6, R8
TP1-TP3
U1
VSS
C3, C4, C8, C9
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.35IN; BOARD HOLE=0.063IN; YELLOW;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
PACKAGE OUTLINE 0402 NON-POLAR CAPACITOR
PACKAGE OUTLINE 0402 RESISTOR
R3, R7
PCB
PCB Board:MAX40006 EVALUATION KIT
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4
MAX40006 Evaluation Kit
Evaluates: MAX40006
MAX40006 EV Kit Schematics
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