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HA3-2841-5

Description
1 CHANNEL, VIDEO AMPLIFIER, PDIP8, PLASTIC, DIP-8
CategoryAnalog mixed-signal IC    Amplifier circuit   
File Size22KB,2 Pages
ManufacturerRenesas Electronics Corporation
Websitehttps://www.renesas.com/
Download Datasheet Parametric View All

HA3-2841-5 Overview

1 CHANNEL, VIDEO AMPLIFIER, PDIP8, PLASTIC, DIP-8

HA3-2841-5 Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerRenesas Electronics Corporation
Parts packaging codeDIP
package instructionDIP,
Contacts8
Reach Compliance Codenot_compliant
ECCN codeEAR99
Amplifier typeOPERATIONAL AMPLIFIER
JESD-30 codeR-PDIP-T8
JESD-609 codee0
length9.585 mm
Number of functions1
Number of terminals8
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height5.33 mm
surface mountNO
technologyBIPOLAR
Temperature levelCOMMERCIAL EXTENDED
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.62 mm

HA3-2841-5 Preview

Adjustable Bandpass or Bandreject
Filter (HA-2841)
Application Note
June 1996
AN9516.1
Introduction
The filter described here has an easily adjustable center fre-
quency, symmetrical skirts and an attenuation (gain) of
-40(+40)dB at an octave either side of the center frequency
(f
C
). The filter Q (Q = f
C
/BW3dB
250) does not vary signif-
icantly when the center frequency is changed, thus, the
shape of the skirts is essentially independent of the pot set-
ting. This feature yields filters that can be adjusted over a
much wider frequency range than “T” type filters, the only
other type of filter with such a deep notch or narrow band-
pass. Now one filter type is useful in many designs. The cal-
culation of the center frequency for the circuits shown in
Figure 1 and Figure 2 is given in Equation 1 and Equation 2.
1
f
C
= ----------------------------------
-
2πC 3R
1
R
2
Where R
1
=
R
1A
+
αR
P
R
2
=
R
2A
+
(
1
α )R
P
R
3
=
6
(
R
1
+
R
2
)
(EQ. 2)
(EQ. 1)
is passive and comprised of C, R
1
, R
2
and R
3
is shown in
Figure 1. The bandpass filter, which includes the passive
network in the feedback loop, is shown in Figure 2. The
bandpass filter has the advantage of high input impedance
and low output impedance because of the location of the op
amp. With the values shown the center frequency is adjust-
able from 55kHz to 550kHz producing a decade of frequency
adjustment. The Intersil HA-2841 op amp is chosen as the
amplifier because it has good DC characteristics and has the
high gain bandwidth required to achieve the bandpass gain
without distorting the filter response. R
1
should be split into
R
1A
and R
1B
to prevent R
1
from becoming zero, and the
split may be selected to obtain maximum resolution over the
desired center frequency range.
A PSPICE™ plot of the circuit using the SPICE Model for the
HA-2841 is shown in Figure 3. The plots are the logarithmic
transfer function of both the filters (in dB). Notice that the
bandreject filter transfer function, represented by the dia-
monds, is the mirror image of the bandpass transfer function,
represented by the squares. These transfer functions
change very little when they are adjusted to 550kHz center
frequency. Bench test results show some deviation from the
PSPICE™ simulations because of component tolerances
and layout capacitances, but generally they correlate well
with the simulations. The transfer functions change radically
and tend to degenerate at high frequencies if low gain band-
width op amps are used.
+15
HA-2841 0.1µF
V
IN
+
A basic theorem of feedback circuits is that a function gener-
ator included in a negative feedback loop computes the
inverse function at the output. This approach has been used
to change an excellent bandreject filter into an excellent
bandpass filter. The schematic of the bandreject filter, which
-
V
OUT
0.1µF
R
3
, 62K
+15
HA-2841 0.1µF
-15
R
3
, 62K
V
OUT
C
R
1A
10
C
R
P
5K
C
R
2A
5.1K
V
IN
C = 0.33nF
C
R
1A
10
C
R
P
5K
C
R
2A
5.1K
+
-
0.1µF
-15
C = 0.33nF
FIGURE 1. ADJUSTABLE BANDREJECT FILTER
FIGURE 2. ADJUSTABLE BANDPASS FILTER
1
1-888-INTERSIL or 321-724-7143
|
Copyright
©
Intersil Corporation 1999
PSPICE™ is a registered trademark of MicroSim Corp.
Application Note 9516
120
80
MAGNITUDE (dB)
40
0
-40
-80
-120
1K
20LOG(V
OUT
/V
IN
)
(BANDREJECT FILTER)
20LOG(V
OUT
/V
IN
)
(BANDPASS FILTER)
3K
10K
30K
100K
300K
1M
FREQUENCY (Hz)
FIGURE 3. PSPICE PLOT OF FILTERS TRANSFER FUNCTION
All Intersil semiconductor products are manufactured, assembled and tested under
ISO9000
quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site
www.intersil.com
Sales Office Headquarters
NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (321) 724-7000
FAX: (321) 724-7240
EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
Intersil (Taiwan) Ltd.
7F-6, No. 101 Fu Hsing North Road
Taipei, Taiwan
Republic of China
TEL: (886) 2 2716 9310
FAX: (886) 2 2715 3029
2
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