MAX4223EVKIT - Maxim Integrated Products, Inc.

_________________________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 50Ωload.

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.

_______________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 50Ωterminating 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

♦1GHz -3dB Bandwidth

♦300MHz 0.1dB Gain Flatness

♦1100V/µs Slew Rate

♦±5V Supply Operation

♦Optional Adjustable Gain

♦High-Impedance Shutdown Mode

♦Fully Assembled and Tested

Evaluates: MAX4223/MAX4224

MAX4223 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-1281; Rev 0; 8/97

QTY DESCRIPTION

C1, C2 2 0.1µF, 10% ceramic capacitors

C3, C4 2 10µF, 10V, 20% tantalum capacitors

AVX TAJB106M010 or

Sprague 293D106X0010B

R1, R2 2 49.9Ω, 1% resistors

RF 1 560Ω, 5% resistor

RG 0 Open

SUPPLIER PHONE FAX

AVX (803) 946-0690 (803) 626-3123

______________Component Suppliers

DESIGNATION

____________________Component List ______________Ordering Information

Sprague (603) 224-1961 (603) 224-1430

PART

MAX4223EVKIT-SO -40°C to +85°C

TEMP. RANGE BOARD TYPE

Surface Mount

IN, OUT 2 SMA connectors

U1 1 MAX4223ESA

JU1 1 3-pin header

None 1 Shunt for JU1

None 1 PC board

None 1 MAX4223 data sheet

Note: Please indicate that you are using the MAX4223 when

contacting these component suppliers.

Note: To evaluate the MAX4224, request a MAX4224ESA free

sample.

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.

_______________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.

Table 1. Jumper JU1 Functions

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 (RF) and gain-set (RG) 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.

Evaluates: MAX4223/MAX4224

MAX4223 Evaluation Kit

2 _______________________________________________________________________________________

SHUNT

LOCATION MAX4223

SHDN PIN MAX4223

OUTPUT

1 & 2 Connected to VCC Enabled

2 & 3 Connected to GND Disabled

MAX4223

N.C.

VEE 4

SHDN 83JU1

49.9Ω

VCC

OUT

VCC

10µF

10V

0.1µF

SHDN

OUT

IN-

OPEN

IN+

560Ω

10µF

10V

0.1µF

49.9Ω

N.C.

VEE

Figure 1. MAX4223 EV Kit Schematic

Evaluates: MAX4223/MAX4224

MAX4223 Evaluation Kit

_______________________________________________________________________________________ 3

Figure 2. MAX4223 EV Kit Component Placement Guide

1.0"

Figure 3. MAX4223 EV Kit PC Board Layout—Component Side Figure 4. MAX4223 EV Kit PC Board Layout—Solder Side

1.0"

Evaluates: MAX4223/MAX4224

MAX4223 Evaluation Kit

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.

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600