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MAX4223 Evaluation Kit
_______________General Description
The MAX4223 evaluation kit (EV kit) simplifies evalua-
tion of the 1GHz, low-power MAX4223 current-feed-
back amplifier. The EV kit circuit demonstrates the
MAX4223 in the noninverting unity-gain configuration.
RF-style connectors (SMA) and 50Ω terminating resis-
tors are included for test equipment compatibility.
The MAX4223 EV kit uses a PC board design optimized
for high-frequency amplifiers. This board can also be
used to evaluate the MAX4224 and other Maxim ampli-
fiers that share the same pinout .
____________________________Features
o
1GHz -3dB Bandwidth
o
300MHz 0.1dB Gain Flatness
o
1100V/µs Slew Rate
o
±5V Supply Operation
o
Optional Adjustable Gain
o
High-Impedance Shutdown Mode
o
Fully Assembled and Tested
Evaluates: MAX4223/MAX4224
____________________Component List
DESIGNATION QTY
C1, C2
C3, C4
R1, R2
RF
RG
IN, OUT
U1
JU1
None
None
None
2
2
2
1
0
2
1
1
1
1
1
DESCRIPTION
0.1µF, 10% ceramic capacitors
10µF, 10V, 20% tantalum capacitors
AVX TAJB106M010 or
Sprague 293D106X0010B
49.9Ω, 1% resistors
560Ω, 5% resistor
Open
SMA connectors
MAX4223ESA
3-pin header
Shunt for JU1
PC board
MAX4223 data sheet
______________Ordering Information
PART
MAX4223EVKIT-SO
TEMP. RANGE
-40°C to +85°C
BOARD TYPE
Surface Mount
Note: To evaluate the MAX4224, request a MAX4224ESA free
sample.
_________________________Quick Start
The MAX4223 EV kit is fully assembled and tested.
Follow these steps to verify board operation.
1) The circuit requires supply voltages of ±2.85V to
±5.5V. For evaluation purposes, connect a +5V sup-
ply to the pad labeled VCC and a -5V supply to the
pad labeled VEE. Connect the power-supply ground
to the pad labeled GND.
2) Verify that the shunt is across pins 1 and 2 of jumper
JU1.
3) Connect the output labeled OUT to an oscilloscope
input. For best performance, terminate the output
with a 50Ω load.
4) Turn on the power supply. Apply a signal of ±2.5V
maximum to the SMA connector labeled IN.
5) Verify the output signal on the oscilloscope.
Note: When using a 50Ω-terminated oscilloscope input,
the output amplitude observed will be half that of the
input, due to the voltage divider formed by the 49.9Ω
back-terminating resistor (R1) and the oscilloscope
input termination impedance.
______________Component Suppliers
SUPPLIER
AVX
Sprague
PHONE
(803) 946-0690
(603) 224-1961
FAX
(803) 626-3123
(603) 224-1430
Note: Please indicate that you are using the MAX4223 when
contacting these component suppliers.
________________________________________________________________
Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX4223 Evaluation Kit
Evaluates: MAX4223/MAX4224
_______________Detailed Description
Shutdown Control
The MAX4223 provides a shutdown pin (SHDN) to
enable or disable the output. Table 1 lists the options
available for the shutdown control jumper, JU1. To use
an external controller, remove the shunt on JU1 com-
pletely and connect the external controller to the pad
labeled
SHDN. SHDN
is a TTL/CMOS logic-level input.
Voltage Gain Adjustment
The MAX4223 is optimized for applications requiring a
gain of +1 (0dB) or greater. Its gain can be set by
changing the feedback (R
F
) and gain-set (R
G
) resis-
tors. For improved performance at a gain of +2 (6dB)
or greater, replace the MAX4223 with a free sample of
the MAX4224. Refer to the MAX4223–MAX4228 data
sheet for recommended feedback-resistor values.
Layout Considerations
The PC board layout has been optimized for high-
speed signals and low distortion, with careful attention
given to grounding, power-supply bypassing, and sig-
nal-path layout. The small, surface-mount, ceramic
bypass capacitors (C1 and C2) have been placed as
close to the amplifier’s supply pins as possible. The
ground plane has been removed around and under the
amplifier to reduce stray capacitance. Capacitance at
the inverting input pins has been minimized by reduc-
ing the length and width of the input and feedback
traces, and by using 0805-size surface-mount feed-
back and gain-set resistors.
Table 1. Jumper JU1 Functions
SHUNT
LOCATION
1&2
2&3
MAX4223
SHDN
PIN
Connected to V
CC
Connected to GND
MAX4223
OUTPUT
Enabled
Disabled
1
N.C.
SHDN
8
3
2
1
JU1
SHDN
2
R
G
OPEN
IN-
MAX4223
V
CC
7
C2
0.1µF
C4
10µF
10V
VCC
OUT
IN
R2
49.9Ω
3
IN+
6
R1
49.9Ω
OUT
VEE
C3
10µF
10V
C1
0.1µF
4
V
EE
N.C.
5
R
F
560Ω
Figure 1. MAX4223 EV Kit Schematic
2
_______________________________________________________________________________________
MAX4223 Evaluation Kit
Evaluates: MAX4223/MAX4224
1.0"
Figure 2. MAX4223 EV Kit Component Placement Guide
1.0"
Figure 3. MAX4223 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX4223 EV Kit PC Board Layout—Solder Side
3
_______________________________________________________________________________________
MAX4223 Evaluation Kit
Evaluates: MAX4223/MAX4224
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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