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HFA1135 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. HFA1135
Description  360MHz, Low Power, Video Operational Amplifier with Output Limiting
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HFA1135 Datasheet(HTML) 4 Page - Intersil Corporation

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Application Information
Relevant Application Notes
The following Application Notes pertain to the HFA1135:
• AN9653-Use and Application of Output Limiting
Amplifiers
• AN9752-Sync Stripper and Sync Inserter for
Composite Video
• AN9787-An Intuitive Approach to Understanding
Current Feedback Amplifiers
• AN9420-Current Feedback Amplifier Theory and
Applications
• AN9663-Converting from Voltage Feedback to Current
Feedback Amplifiers
These publications may be obtained from Intersil’s web site
(www.intersil.com) or via our AnswerFAX system.
Optimum Feedback Resistor
Although a current feedback amplifier’s bandwidth
dependency on closed loop gain isn’t as severe as that of a
voltage feedback amplifier, there can be an appreciable
decrease in bandwidth at higher gains. This decrease may
be minimized by taking advantage of the current feedback
amplifier’s unique relationship between bandwidth and RF.
All current feedback amplifiers require a feedback resistor,
even for unity gain applications, and RF, in conjunction with
the internal compensation capacitor, sets the dominant pole
of the frequency response. Thus, the amplifier’s bandwidth is
inversely proportional to RF. The HFA1135 design is
optimized for a 250
Ω RF at a gain of +2. Decreasing RF
decreases stability, resulting in excessive peaking and
overshoot (Note: Capacitive feedback will cause the same
Slew Rate
(VOUT = 5VP-P, AV = -1, RF = 330Ω)
+SR
B
25
-
2300
-
V/
µs
-SR (Note 6)
B
25
-
1200
-
V/
µs
Settling Time
(VOUT = +2V to 0V step, Note 5)
To 0.1%
B
25
-
23
-
ns
To 0.05%
B
25
-
33
-
ns
To 0.02%
B
25
-
45
-
ns
VIDEO CHARACTERISTICS
AV = +2, RF = 250Ω, Unless Otherwise Specified
Differential Gain (f = 3.58MHz)
RL = 150Ω
B
25
-
0.02
-
%
RL = 75Ω
B
25
-
0.03
-
%
Differential Phase (f = 3.58MHz)
RL = 150Ω
B
25
-
0.04
-
Degrees
RL = 75Ω
B
25
-
0.06
-
Degrees
OUTPUT LIMITING CHARACTERISTICS
AV = +2, RF = 250Ω, VH = +1V, VL = -1V, Unless Otherwise Specified
Limit Accuracy (Note 5)
VIN = ±2V, AV = -1,
RF = 510Ω
A
Full
-125
25
125
mV
Overdrive Recovery Time (Note 5)
VIN = ±1V
B
25
-
0.8
-
ns
Negative Limit Range
B
25
-5.0 to +2.5
V
Positive Limit Range
B
25
-2.5 to +5.0
V
Limit Input Bias Current
A
25
-
50
200
µA
A
Full
-
80
200
µA
POWER SUPPLY CHARACTERISTICS
Power Supply Range
C
25
±4.5
-
±5.5
V
Power Supply Current (Note 5)
A
Full
6.4
6.9
7.3
mA
NOTES:
2. Test Level: A. Production Tested; B. Typical or Guaranteed Limit Based on Characterization; C. Design Typical for Information Only.
3. The optimum feedback resistor for the HFA1135 at AV = +1 is 1.5kΩ. The Production Tested parameters are tested with RF = 510Ω because
the HFA1135 shares test hardware with the HFA1105 amplifier.
4. Undershoot dominates for output signal swings below GND (e.g., 0.5VP-P), yielding a higher overshoot limit compared to the VOUT = 0V to 0.5V
condition. See the “Application Information” section for details.
5. See Typical Performance Curves for more information.
6. Slew rates are asymmetrical if the output swings below GND (e.g., a bipolar signal). Positive unipolar output signals have symmetric positive and
negative slew rates comparable to the +SR specification. See the “Application Information” section, and the pulse response graphs for details.
Electrical Specifications
VSUPPLY = ±5V, AV = +1, RF = 510Ω (Note 3), RL = 100Ω, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
(NOTE 2)
TEST
LEVEL
TEMP.
(oC)
MIN
TYP
MAX
UNITS
HFA1135


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