EVAL-PRAOPAMP-4RUZ Analog Devices Inc, EVAL-PRAOPAMP-4RUZ Datasheet
EVAL-PRAOPAMP-4RUZ
Manufacturer Part Number
EVAL-PRAOPAMP-4RUZ
Description
Quad RU-8 RoHS EVAL Brd
Manufacturer
Analog Devices Inc
Specifications of EVAL-PRAOPAMP-4RUZ
Channels Per Ic
4 - Quad
Amplifier Type
General Purpose
Board Type
Bare (Unpopulated)
Utilized Ic / Part
14-TSSOP Package
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Operating Temperature
-
Output Type
-
Current - Output / Channel
-
Voltage - Supply, Single/dual (±)
-
-3db Bandwidth
-
Slew Rate
-
Current - Supply (main Ic)
-
Lead Free Status / Rohs Status
Supplier Unconfirmed
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/461-3113 •
INTRODUCTION
The EVAL-PRAOPAMP- 4R/4RU is an evaluation board
which accommodates quad op amps in SOIC and TSSOP
packages. It is meant to provide the user with multiple
choices and extensive flexibility for different applica-
tions circuits and configurations.
This board is not intended to be used with high frequency
components or high speed amplifiers. However, it provides
the user with many combinations for various circuit
types including active filters, instrumentation amplifiers,
composite amplifier, and external frequency compensa-
tion circuits. For examples of application circuits refer to
ADI amplifier data sheets under the applications section.
This application note will present different implementa-
tions of filter design using quad amplifiers.
STATE VARIABLE FILTER (INVERTING)
The SV filter uses two integrators and a summing amplifier
to provide second-order low-pass, band-pass, and high-
pass responses. A fourth op amp can be used to combine
the existing responses and synthesize the notch or the
all-pass responses.
This filter circuit can be easily constructed using the
quad EVAL_PRAOPAMP board and following the sche-
matic in Figure 1.
REV. 0
–V
IN
A
R6
R5
Quad Precision Op Amp Evaluation Board
*R
JUMP
2
3
R4
AND R
V
V
V–
V+
CC
EE
A1
by Giampaolo Marino and Steve Ranta
Figure 1. State Variable Filter (Inverting)
JUMP1
1
R
IS AN EXTERNAL COMPONENT, NOT PROVIDED ON THE APPLICATION BOARD.
JUMP1
V
HP
= V
*
R8
R
OUT
JUMP
A
*
6
5
V
V
V+
V–
CC
EE
A2
C6
Using the superposition principle, we write
Since A2 and A3 are integrators, we have:
After extended simplifications we have the following
expressions:
From the above expressions we observe that Q depends
on the resistor ratio R
to be much less sensitive to resistance tolerances and
drift. Indeed, with proper component selection and
circuit construction, the SV filter can easily yield depend-
able Qs in the range of hundreds. For best results, it is
advisable to use metal film resistors and polystyrene or
polycarbonate capacitors, and properly bypass the op
amp supplies.
7
and
Q
H
ω
(
V
1
V
o
OHP
BP
BP
=
+
=
R6 R
R13
= V
=
(
=
1
OUT
(
(
(
1
/
– /
V
R4 R
–
+
1
+
R4 R6 H
B
HP
R4 / R6
JUMP
APPLICATION NOTE
1
1
R
R8 C6s V
/
+
+
/
JUMP1
=
10
9
(
(
JUMP
R4 / R6
R
(
–
+
JUMP1
,
R6 / R4 V
R6 R4 H
V
V
+
V+
V–
/
)
CC
EE
) (
R5
OBP
R4 /R
/
A3
C8
/
HP
)
JUMP1
/ R5
)
R8 C6 R13 C8
+
=
8
)
and
)
(
(
(
,
JUMP
R4 / R
R4 R8 C6 /R
1
)
1
V
+
/R5. We therefore expect Q
–
LP
OLP
R
(
= V
)
R4 R
V
JUMP1
JUMP
LP
=
OUT
/
–
=
C
R
JUMP
)
/
(
JUMP
)
R5
/
–
JUMP
1
www.analog.com
/ R13 C8 V
)
)
V
/
AN-797
V
/
BP
R6
LP
R13 C8
+
)
)
BP
/
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EVAL-PRAOPAMP-4RUZ Summary of contents
Page 1
... A fourth op amp can be used to combine the existing responses and synthesize the notch or the all-pass responses. This filter circuit can be easily constructed using the quad EVAL_PRAOPAMP board and following the sche- matic in Figure –V ...
Page 2
AN-797 The SV filter is usually implemented with R13 = R and So, the above expressions simplify to ( ω ...
Page 3
... A +IN A –IN B +IN B –IN C +IN C –IN D +IN D Figure 4. Quad Precision Op Amp Evaluation Board Electrical Schematic REV R11 R9 R10 R16 R13 R14 R15 C7 0 C10 R21 R18 R19 R20 C9 0 –3– AN-797 R7 OUT R12 OUT R17 OUT R22 OUT ...
Page 4
... AN-797 Figure 5. Quad Precision Op Amp Evaluation Board Layout Patterns © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. –4– REV. 0 ...