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HFA1105 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. HFA1105
Description  330MHz, Low Power, Current Feedback Video Operational Amplifier
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HFA1105 Datasheet(HTML) 4 Page - Intersil Corporation

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4
Application Information
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 HFA1105 design is
optimized for RF = 510Ω at a gain of +2. Decreasing RF
decreases stability, resulting in excessive peaking and
Overshoot (Note 4)
(VOUT = 0 to 0.5V, VIN tRISE = 1ns)
+OS
B
25
-
3
-
%
-OS
B
25
-
5
-
%
Overshoot (Note 4)
(VOUT = 0.5VP-P, VIN tRISE = 1ns)
+OS
B
25
-
3
-
%
-OS
B
25
-
11
-
%
Slew Rate
(VOUT = 4VP-P, AV = +1, +RS = 510Ω)
+SR
B
25
-
1000
-
V/
µs
B
Full
-
975
-
V/
µs
-SR (Note 5)
B
25
-
650
-
V/
µs
B
Full
-
580
-
V/
µs
Slew Rate
(VOUT = 5VP-P, AV = +2)
+SR
B
25
-
1400
-
V/
µs
B
Full
-
1200
-
V/
µs
-SR (Note 5)
B
25
-
800
-
V/
µs
B
Full
-
700
-
V/
µs
Slew Rate
(VOUT = 5VP-P, AV = -1)
+SR
B
25
-
2100
-
V/
µs
B
Full
-
1900
-
V/
µs
-SR (Note 5)
B
25
-
1000
-
V/
µs
B
Full
-
900
-
V/
µs
Settling Time
(VOUT = +2V to 0V step, Note 6)
To 0.1%
B
25
-
15
-
ns
To 0.05%
B
25
-
23
-
ns
To 0.02%
B
25
-
30
-
ns
Overdrive Recovery Time
VIN = ±2V
B
25
-
8.5
-
ns
VIDEO CHARACTERISTICS
AV = +2, RF = 510Ω, 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
-
0.03
-
Degrees
RL = 75Ω
B
25
-
0.05
-
Degrees
POWER SUPPLY CHARACTERISTICS
Power Supply Range
C
25
±4.5
-
±5.5
V
Power Supply Current (Note 6)
A
25
-
5.8
6.1
mA
A
Full
-
5.9
6.3
mA
NOTES:
3. Test Level: A. Production Tested; B. Typical or Guaranteed Limit Based on Characterization; C. Design Typical for Information Only.
4. Undershoot dominates for output signal swings below GND (e.g., 0.5VP-P), yielding a higher overshoot limit compared to the VOUT = 0 to 0.5V
condition. See the “Application Information” section for details.
5. 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.
6. See Typical Performance Curves for more information.
Electrical Specifications VSUPPLY = ±5V, AV = +1, RF = 510Ω, RL = 100Ω, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
(NOTE 3)
TEST
LEVEL
TEMP.
(oC)
MIN
TYP
MAX
UNITS
HFA1105


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