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HA-2544 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer HA-2544
Beschreibung 50MHz/ Video Operational Amplifier
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 11 Seiten
HA-2544 Datasheet, Funktion
Data Sheet
HA-2544
April 1999 File Number 2900.4
50MHz, Video Operational Amplifier
The HA-2544 is a fast, unity gain stable, monolithic op amp
designed to meet the needs required for accurate
reproduction of video or high speed signals. It offers high
voltage gain (6kV/V) and high phase margin (65 degrees)
while maintaining tight gain flatness over the video
bandwidth. Built from high quality Dielectric Isolation, the
HA-2544 is another addition to the Intersil series of high
speed, wideband op amps, and offers true video
performance combined with the versatility of an op amp.
The primary features of the HA-2544 include 50MHz Gain
Bandwidth, 150V/µs slew rate, 0.03% differential gain error
and gain flatness of just 0.12dB at 10MHz. High
performance and low power requirements are met with a
supply current of only 10mA.
Uses of the HA-2544 range from video test equipment,
guidance systems, radar displays and other precise imaging
systems where stringent gain and phase requirements have
previously been met with costly hybrids and discrete
circuitry. The HA-2544 will also be used in non-video
systems requiring high speed signal conditioning such as
data acquisition systems, medical electronics, specialized
instrumentation and communication systems.
Military (/883) product and data sheets are available upon
request.
Ordering Information
PART NUMBER
TEMP.
(BRAND)
RANGE (oC)
PACKAGE
HA3-2544C-5
HA7-2544-2
0 to 75 8 Ld PDIP
-55 to 125 8 Ld CERDIP
PKG.
NO.
E8.3
F8.3A
Features
• Gain Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . 50MHz
• High Slew Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . 150V/µs
• Low Supply Current . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
• Differential Gain Error. . . . . . . . . . . . . . . . . . . . . . . 0.03%
• Differential Phase Error . . . . . . . . . . . . . . . . 0.03 Degrees
• Gain Flatness at 10MHz. . . . . . . . . . . . . . . . . . . . . 0.12dB
Applications
• Video Systems
• Imaging Systems
• Video Test Equipment
• Pulse Amplifiers
• Radar Displays
• Signal Conditioning Circuits
• Data Acquisition Systems
Pinout
HA-2544 (CERDIP)
HA-2544C (PDIP)
TOP VIEW
BAL 1
-IN 2
+IN 3
V- 4
-
+
8 NC
7 V+
6 OUT
5 BAL
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999






HA-2544 Datasheet, Funktion
HA-2544
Another usage might be required for a direct 50or 75load
where the HA-2544 will still swing this ±2V signal as shown in
the above display. One important note that must be realized is
that as load resistance decreases the video parameters are
also degraded. For optimal video performance a 1kload is
recommended.
If lower supply voltages are required, such as ±5V, many of
the characterization curves indicate where the parameters
vary. As shown the bandwidth, slew rate and supply current
are still very well maintained.
Prototyping and PC Board Layout
When designing with the HA-2544 video op amp as with
any high performance device, care should be taken to use
high frequency layout techniques to avoid unwanted
parasitic effects. Short lead lengths, low source impedance
and lower value feedback resistors help reduce unwanted
poles or zeros. This layout would also include ground plane
construction and power supply decoupling as close to the
supply pins with suggested parallel capacitors of 0.1µF and
0.001µF ceramic to ground.
In the noninverting configuration, the amplifier is sensitive
to stray capacitance (<40pF) to ground at the inverting
input. Therefore, the inverting node connections should be
kept to a minimum. Phase shift will also be introduced as
load parasitic capacitance is increased. A small series
Typical Applications
SHIELDED
CABLE
1.21K
100 1.21K
1.21K
-
+
HA-2544
1.21K
FIGURE 4. APPLICATION 1, 75DIFFERENTIAL INPUT BUFFER
2.1K
INPUT
750pF
750pF
2.1K
-
+
HA-2544
OUTPUT
1
fO = 2π (2.1K x 750pF)
FIGURE 6. APPLICATION 3, 100kHz HIGH PASS 2-POLE
BUTTERWORTH FILTER
resistor (20to 100) before the capacitance effectively
decouples this effect.
Stability/Phase Margin/Compensation
The HA-2544 has not sacrificed unity gain stability in
achieving its superb AC performance. For this device, the
phase margin exceeds 60 degrees at the unity crossing
point of the open loop frequency response. Large phase
margin is critical in order to reduce the differential phase and
differential gain errors caused by most other op amps.
Because this part is unity gain stable, no compensation pin
is brought out. If compensation is desired to reduce the
noise bandwidth, most standard methods may be used. One
method suggested for an inverting scheme would be a
series R-C from the inverting node to ground which will
reduce bandwidth, but not effect slew rate. If the user wishes
to achieve even higher bandwidth (>50MHz), and can
tolerate some slight gain peaking and lower phase margin,
experimenting with various load capacitance can be done.
Shown in Application 1 is an excellent Differential Input,
Unity Gain Buffer which also will terminate a cable to 75
and reject common mode voltages. Application 2 is a
method of separating a video signal up into the Sync only
signal and the Video and Blanking signal. Application 3
shows the HA-2544 being used as a 100kHz High Pass
2-Pole Butterworth Filter. Also shown is the measured
frequency response curves.
1K
COMPOSITE
VIDEO
1K
-
+
HA-2544
1K
SYNC ONLY
1N5711
1N5711
VIDEO AND
BLANK
FIGURE 5. APPLICATION 2, COMPOSITE VIDEO SYNC
SEPARATOR
0
-20
-40 f0 = 105.3kHz
-60
-80
-100
180
135
90
45
0
10 100 1K 10K 100K 1M
-45
10M
FREQUENCY (Hz)
FIGURE 7. MEASURED FREQUENCY RESPONSE OF
APPLICATION 3
6

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