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HA-2841 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. HA-2841
Description  50MHz, Fast Settling, Unity Gain Stable, Video Operational Amplifier
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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HA-2841 Datasheet(HTML) 4 Page - Intersil Corporation

   
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4
Typical Applications (Also see Application Note AN550)
Application 1 - High Power Amplifiers and Buffers
High power amplifiers and buffers are in use in a wide variety
of applications. Many times the “high power” capability is
needed to drive large capacitive loads as well as low value
resistive loads. In both cases the final driver stage is usually a
power transistor of some type, but because of their inherently
low gain, several stages of pre-drivers are often required. The
HA-2841, with its 15mA output rating, is powerful enough to
drive a power transistor without additional stages of current
amplification. This capability is well demonstrated with the
high power buffer circuit in Figure 1.
The HA-2841 acts as the pre-driver to the output power
transistor. Together, they form a unity gain buffer with the
ability to drive three 50
Ω coaxial cables in parallel, each with
a capacitance of 2000pF. The total combined load is 16.6
and 6000pF capacitance
.
Application 2 - Video
One of the primary uses of the HA-2841 is in the area of
video applications. These applications include signal
construction, synchronization addition and removal, as well
as signal modification. A wide bandwidth device such as the
HA-2841 is well suited for use in this class of amplifier. This,
however, is a more involved group of applications than
ordinary amplifier applications since video signals contain
precise DC levels which must be retained.
The addition of a clamping circuit restores DC levels at the
output of an amplifier stage. The circuit shown in Figure 2
utilizes the HA-5320 sample and hold amplifier as the DC
clamp. Also shown is a 3.57MHz trap in series, which will
block the color burst portion of the video signal and allow the
DC level to be amplified and restored.
Prototyping Guidelines
For best overall performance in any application, it is
recommended that high frequency layout techniques be
used. This should include:
1. Mounting the device through a ground plane.
2. Connecting unused pins (NC) to the ground plane.
3. Mounting feedback components on Teflon standoffs
and/or locating these components as close to the device
as possible.
4. Placing power supply decoupling capacitors from device
supply pins to ground.
SETTLING TIME TEST CIRCUIT
SUGGESTED OFFSET VOLTAGE ADJUSTMENT
Test Circuits and Waveforms (Continued)
+
V-
V+
SETTLING
POINT
VOUT
VIN
5k
-
5k
2k
2k
NOTES:
14. AV = -1.
15. Load Capacitance should be less than 10pF.
16. Feedback and summing resistors must be matched to 0.1%.
17. Tektronix P6201 FET probe used at settling point.
18. HP5082-2810 clipping diodes recommended.
+
-
V-
5k
V+
OUT
BAL
D2
HP2835
LOAD 16.6
Ω; 6000pF
OR 12.5
Ω; 6000pF
D1
HP2835
+
HA-2841
-
R3
100
50
R1
R2
1K
2N5886
532pF
D3
FIGURE 1. DRIVING POWER TRANSISTORS TO GAIN
ADDITIONAL CURRENT BOOSTING
HA-2841
1k
1k
1k
1k
1k
75
3.57MHz
TRAP
HA-5320
FIGURE 2. VIDEO DC RESTORER
HA-2841


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