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AN-0992
APPLICATION NOTE
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Active Filter Evaluation Board for Differential Amplifiers
by John Ardizzoni
The EVAL-FLTR-DF-1RZ active filter evaluation board is
designed to work with the Analog Devices, Inc., differential
amplifiers. The filter board enables quick prototyping of two- or
three-pole multiple feedback active filters. The board schematic
shown in Figure 1 is for a low-pass filter. Converting the board
from a low-pass filter to a high-pass filter is accomplished by
swapping the location of the filters resistors and capacitors.
The boards also have provisions for edge-mounted SMA
connectors, which simplify testing and integration. The input
of the filter can be driven either single-ended or differentially.
The active filter evaluation boards are bare, which enables
users to customize the filter design. The filter board assembly
drawing is shown in Figure 2. All components are 0603 case
sizes with the exception of the large bypass capacitors, which
are 3216 case sizes.
07954-001
8
1
3
V+
NC
VOCM
V–
7
5
6
4
2
U1
R3
R4R2
R1
R9
R8R6 R7
C2
C5 C6C4
C3C1
GND
R11
GND
VIN1
VIN2
V
OUT1
V
OUT2
AGND
GND
C11
10µF
+VS
C10
0.1µF
+
R5
GND
C8
0.1µF
C9
10µF
+
AGND
GND
C7
–VS
R10
Figure 1. Active Filter Evaluation Board Schematic
07954-002
PRIMARY SIDE SECONDARY SIDE
Figure 2. Active Filter Evaluation Board Assembly Drawing
