MAX9633 Evaluation Kit
Evaluates: MAX9633
General Description
The MAX9633 evaluation kit (EV kit) provides a proven
design to evaluate the MAX9633 dual, low-noise, low-
distortion op amp that is optimized to drive ADCs
for use in applications from DC to a few MHz. The
exceptionally fast settling time and low input offset
voltage make the device an excellent solution to drive
high-resolution 12-bit to 18-bit SAR ADCs. The EV kit
circuit is configured as a unity-gain buffer, but can
easily be adapted by installing shunts and changing a
few components to support multiple op-amp configura-
tions: transimpedance, noninverting, inverting, or differ-
ential amplifier. The components on the EV kit have pads
that accommodate 0805 packages, making them easy to
solder and replace. The EV kit accepts a +4.5V to +36V
single-supply voltage, or a
Q2.25V
to
Q18V
dual-supply
voltage.
Features
S
Accommodates Multiple Op-Amp Configurations
S
+4.5V to +36V Wide Input Supply Range
S
0805 Components
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX9633EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
0.1FF
Q10%,
50V X7R ceramic
capacitors (0805)
Murata GRM21BR71H104K
TDK C2012X7R1H104K
4.7FF
Q20%,
50V X7R ceramic
capacitors (1210)
Murata GRM32ER71H475M
TDK C3225X7R1H475M
Not installed, ceramic capacitors
(0805)
DESIGNATION
JU1–JU4
R1, R2, R6, R7
R3, R4, R8, R9
R5, R10
U1
QTY
4
0
4
2
1
DESCRIPTION
2-pin headers
Not installed, resistors (0805)
100I
Q1%
resistors (0805)
0I resistors (0805)
Dual, high-voltage op amp
(8 TDFN-EP*)
Maxim MAX9633ATA+
PCB: MAX9633 EVALUATION
KIT+
C1, C3
2
C2, C4
2
—
*EP
= Exposed pad.
1
C5–C10
0
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
Note:
Indicate that you are using the MAX9633 when contacting these component suppliers.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5499; Rev 0; 9/10
MAX9633 Evaluation Kit
Evaluates: MAX9633
Quick Start
• MAX9633 EV kit
Table 1. Jumper Selection (JU1–JU4)
SHUNT POSITION
Installed
Not installed*
*Default
position.
IN-/IN+ INPUT
Connected to GND
Signal applied at IN-/IN+ pad
Required Equipment
• ±15V, 40mA DC power supply (PS1)
• +1V precision voltage source
• Digital multimeter (DMM)
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
Op-Amp Configuration
Procedure
Inverting Configuration
To configure op-amp U1-A as an inverting amplifier,
replace R2 and R4 with the desired 1% gain-setting
resistors, install a shunt on jumper JU2, and feed a
voltage V
IN
between the INA- and INA+ pads. Install
a shunt on JU2 to ground the INA+ input in this
configuration. The output voltage is given by the
following equation:
=
V
OUT
R4
(
V
IN
+
V
OS
)
R2
1) Connect the positive terminal of the +15V supply to
the VCC pad, and the GND terminal to the GND pad.
Connect the negative terminal of the -15V supply to
the VEE pad, and the GND terminal to the GND pad.
The power supplies should be off.
2) Connect the positive terminal of the precision
voltage source to the INA+ pad. Connect the negative
terminal of the precision voltage source to the INA-
pad.
3) Install a shunt on jumper JU1 to short INA- to GND.
4) Connect the DMM to monitor the voltage on the OUTA
pad.
5) Turn on the
Q15V
power supply.
6) Apply +1V from the precision voltage source. Observe
the output at the OUTA pad on the DMM. OUTA
should read approximately +1V.
7) Repeat steps 2–7 to evaluate OUTB.
The offset voltage V
OS
can be either positive or negative.
To configure op-amp U1-B as an inverting amplifier,
replace R7 and R9 with the desired 1% gain-setting
resistors, install a shunt on jumper JU4, and feed a
voltage V
IN
between the INB- and INB+ pads. Install
a shunt on JU4 to ground the INB+ input in this
configuration. The output voltage is given by the
following equation:
=
V
OUT
R9
(
V
IN
+
V
OS
)
R7
The offset voltage V
OS
can be either positive or negative.
Noninverting Configuration
To configure op-amp U1-A as a noninverting amplifier,
replace R2 and R4 with the desired 1% gain-setting
resistors, replace R3 with a 0I resistor, install a shunt on
jumper JU1, and feed a voltage V
IN
between the INA+
and INA- pads. Install a shunt on JU1 to ground the INA-
input in this configuration. The output voltage is given by
the following equation:
R4
V
OUT
1
+
=
(
V
IN
)
R2
To configure op-amp U1-B as a noninverting amplifier,
replace R7 and R9 with the desired 1% gain-setting
resistors, replace R8 with a 0I resistor, install a shunt on
jumper JU3, and feed a voltage V
IN
between the INB+
Detailed Description of Hardware
The MAX9633 EV kit provides a proven layout for the
MAX9633 dual, low-noise, low-distortion op amp to
support multiple op-amp configurations. The EV kit
accepts a +4.5V to +36V single-supply voltage, or a
Q2.25V
to
Q18V
dual-supply voltage.
Jumper Selection
Input Configuration
Jumpers JU1–JU4 are provided to allow flex-
ibility in grounding inputs for multiple op-amp con-
figurations. When a shunt is installed on the jumper, the
corresponding input pad is referenced to ground. See
Table 1 for the JU1–JU4 configuration. See the
Op-Amp
Configuration
section for more information regarding EV
kit configuration.
2
Maxim Integrated
MAX9633 Evaluation Kit
Evaluates: MAX9633
and INB- pads. Install a shunt on JU3 to ground the INB-
input in this configuration. The output voltage is given by
the following equation:
R9
V
OUT
1
+
=
(
V
IN
)
R7
Differential Amplifier
To configure op-amp U1-A as a differential amplifier,
replace R1–R4 with appropriate resistors and install a
shunt on jumper JU1. Make sure R1 = R4 and R2 = R3.
The CMRR of the differential amplifier is determined by
the matching of the resistor ratios R4/R2 and R1/R3:
V
OUT
=
GAIN
(
INP - INN
)
where:
=
GAIN
R4 R1
=
R2 R3
Transimpedance Application
To configure op-amp U1-A as a transimpedance
amplifier (TIA), replace R2 with a 0I resistor and install a
shunt on jumper JU2. The output voltage of the TIA is the
input current multiplied by the feedback resistor:
V
OUT
=
(I
IN
+
I
BIAS
)
×
R4
+
V
OS
where R4 is installed as a 100I resistor, I
IN
is defined as
the input current source applied at the INA- pad, I
BIAS
is
the input bias current, and V
OS
is the input offset voltage
of the op amp. Use capacitor C6 (and C5, if applicable) to
stabilize the op amp by rolling off high-frequency gain
due to a large cable capacitance.
To configure op-amp U1-B as a TIA, replace R7 with a
0I resistor and install a shunt on jumper JU4. The output
voltage of the TIA is the input current multiplied by the
feedback resistor:
V
OUT
=
(I
IN
+
I
BIAS
)
×
R9
+
V
OS
where R9 is installed as a 100I resistor, I
IN
is defined as
the input current source applied at the INB- pad, I
BIAS
is
the input bias current, and V
OS
is the input offset voltage
of the op amp. Use capacitor C9 (and C8, if applicable) to
stabilize the op amp by rolling off high-frequency gain
due to a large cable capacitance.
Some applications require driving large capacitive loads.
To improve the stability of the amplifier in such cases,
replace R5 (R10) with a suitable resistor value to improve
amplifier phase margin. The R5/C7 (R10/C10) filter can
also be used as an anti-alias filter, or to limit amplifier
output noise by reducing its output bandwidth.
To configure op-amp U1-B as a differential amplifier,
replace R6–R9 with appropriate resistors and install a
shunt on jumper JU3. Make sure R6 = R9 and R7 = R8.
The CMRR of the differential amplifier is determined by
the matching of the resistor ratios R9/R7 and R6/R8:
V
OUT
=
GAIN
(
INP - INN
)
Capacitive Loads
where:
GAIN
=
R9 R6
=
R7 R8
Maxim Integrated
3
MAX9633 Evaluation Kit
Evaluates: MAX9633
Figure 1. MAX9633 EV Kit Schematic
4
Maxim Integrated
MAX9633 Evaluation Kit
Evaluates: MAX9633
1.0’’
Figure 2. MAX9633 EV Kit Component Placement Guide—
Component Side
1.0’’
Figure 3. MAX9633 EV Kit PCB Layout—Component Side
1.0’’
Figure 4. MAX9633 EV Kit PCB Layout—Solder Side
Maxim Integrated
5
单片机
