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AD8244-EVALZ User Guide
UG-650
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the AD8244 Quad FET Input Buffer
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 8
FEATURES
Enables quick evaluation of the AD8244
Enables quick prototyping
Allows for various circuit configurations
SMA/SMB or test loop inputs and outputs
Easy connection to test equipment and other circuits
RoHS compliant
GENERAL DESCRIPTION
The AD8244-EVA LZ makes it easy for designers to obtain quick
performance results for their particular application circuit using
the AD8244 quad, FET input, unity-gain buffer.
The evaluation board design is flexible to allow for common
circuit options, including source impedance and space for
output loading and filtering. Most resistors and capacitors use
0805 packages.
This 4-layer evaluation board comes installed with color-coded
test loops, mainly intended for use with mini-clip type con-
nectors. The board also has pads for end-launch SMA or SMB
connectors on inputs and outputs, recommended for tests that
require higher signal integrity than the mini-clip can provide.
The inputs are guarded to avoid leakage and maximize the input
impedance. The ground plane, component placement, and
power supply bypassing have been optimized for maximum
circuit flexibility and performance.
Figure 1 shows the primary side of the evaluation board.
Figure 2 shows the evaluation board schematic.
The evaluation board accommodates the AD8244 quad FET-
input buffer in a 10-lead MSOP. The AD8244 data sheet should
be consulted in conjunction with this evaluation board user
guide.
Figure 1. AD8244-EVALZ Primary Side
11986-001
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