19-5046; Rev 0; 11/09
MAX9622 Evaluation Kit
General Description
The MAX9622 evaluation kit (EV kit) provides a proven
design to evaluate the MAX9622 single, precision, high-
bandwidth op amp in a 5-pin SC70 package. The EV kit
circuit is preconfigured as a differential amplifier provid-
ing an overall gain of 10V/V. BNC connectors are provid-
ed for the board input/output, and the components have
pads that accommodate 0603 packages, making them
easy to solder and replace. The EV kit also evaluates
the MAX9623. Request a free sample of the MAX9623
IC from the factory when ordering the MAX9622 EV kit.
S
2.0V to 5.25V Supply Range
S
Preconfigured for 10V/V Gain
S
Also Evaluates the MAX9623 (IC Replacement)
S
0603 Components
S
Fully Assembled and Tested
Features
S
50MHz Gain-Bandwidth (GBW) Product
Evaluates: MAX9622/MAX9623
Ordering Information
PART
TYPE
MAX9622EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
4.7FF
Q10%,
6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
TDK C1608X5R0J475K
1FF
Q10%,
25V X5R ceramic
capacitor (0603)
Murata GRM188R61E105K
TDK C1608X5R1E105M
0.1FF
Q10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
Not installed, ceramic capacitors
(0603)
DESIGNATION
IN, OUT
R1
R2, R3, R8
R4, R5
R6, R7
U1
QTY
2
1
0
2
2
1
DESCRIPTION
50I BNC PCB vertical-mount
connectors
49.9I
Q1%
resistor (0603)
Not installed, resistors—PCB
short (0603)
1kI
Q1%
resistors (0603)
10kI
Q1%
resistors (0603)
High-bandwidth single op amp
(5 SC70)
Maxim MAX9622AXK+
PCB: MAX9622 EVALUATION
KIT+
C1
1
C2
1
C3
1
—
1
C4, C5, C6
0
_______________________________________________________________
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.
MAX9622 Evaluation Kit
Evaluates: MAX9622/MAX9623
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 MAX9622 when contacting these component suppliers.
Quick Start
•
•
•
2.0V to 5.5V, 10mA DC power supply (VCC)
Oscilloscope
Signal generator
Required Equipment
R6 = R7, R4 = R5, and R2 = R3. The gain is simply given
by the following equation (eq. 1):
V
OUT
=
IN
×
R7
eq.1
R5
+
R3
The MAX9622 EV kit is fully assembled and test-
ed. Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1)
This circuit requires a supply voltage of 2.0V to 5.5V.
For evaluation purposes, connect a 5.0V supply to
the pad labeled VCC.
Connect the power-supply ground to the GND PCB
pad.
Connect the OUT BNC connector to an oscillo-
scope.
Turn on the power supply.
Apply a signal at the IN BNC connector.
Verify the output signal on the oscilloscope.
Procedure
The EV kit comes installed with R6 = R7 = 10kI, R4 =
R5 = 1kI, and R2 = R3 = 0I. IN is the input voltage
applied at the IN BNC connector. Modify the resistors as
required for different gains.
For a fully differential configuration, the tolerance of
resistors used greatly impacts the CMRR characteristics
of the board. Use 0.1% resistors for enhanced common-
mode rejection. To interface to a fully differential input
signal with a common mode other than the EV kit ground,
cut the trace connection between the power ground and
the circuit ground.
Noninverting Gain
The EV kit can also be used to provide a simple nonin-
verting gain to the input signal. Remove R6 and change
R4 to a 0I resistor. The gain is then given by the follow-
ing equation (eq. 2):
R7
V
OUT
=
V
IN
×
1
+
eq.2
R5
+
R3
2)
3)
4)
5)
6)
Detailed Description of Hardware
The MAX9622 EV kit provides a proven layout for the
MAX9622 precision, high-bandwidth op amp. The EV
kit circuit is preconfigured as a differential amplifier pro-
viding an overall gain of 10V/V. The signal is amplified
through the op amp with the gain set by resistors R5 and
R7. The device accepts a single-supply voltage from
2.0V to 5.5V.
where R7 is installed as a 10kI resistor, R5 is installed
as a 1kI resistor, R3 is a 0I PCB short, and V
IN
is the
input voltage at IN+ of the op amp. The EV kit provides
a gain of 11V/V.
Some applications require driving large capacitive
loads. To improve the stability of the amplifier in such
cases, replace resistor R8 with a suitable resistor value
to improve amplifier phase margin by isolating the load
capacitor. The R8/C4 lowpass filter can also be used
as an anti-alias filter or to limit amplifier output noise by
reducing its output bandwidth.
Capacitive Loads
Op-Amp Configuration
Differential Amplifier Gain
The EV kit comes configured as a differential amplifier
with G = 10. Gain is set by a ratio of R7 to (R5 + R3) if
2
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