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HFA1205 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. HFA1205
Description  Dual, 425MHz, Low Power, Video Operational Amplifier
Download  15 Pages
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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HFA1205 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 HFA1205 design is
optimized for a 464
Ω R
F at a gain of +2. Decreasing RF
decreases stability, resulting in excessive peaking and
overshoot (Note: Capacitive feedback will cause the same
problems due to the feedback impedance decrease at higher
frequencies). At higher gains the amplifier is more stable, so
RF can be decreased in a trade-off of stability for bandwidth.
Table 1 lists recommended RF values for various gains, and
the expected bandwidth. For good channel-to-channel gain
matching, it is recommended that all resistors (termination
as well as gain setting) be
±1% tolerance or better. Note that
a series input resistor, on +IN, is required for a gain of +1, to
reduce gain peaking and increase stability.
Slew Rate
(VOUT = 4VP-P, AV = +1, +RS = 432Ω)
+SR
B
25
-
1150
-
V/
µs
-SR (Note 5)
B
25
-
800
-
V/
µs
Slew Rate (VOUT = 5VP-P, AV = +2)
+SR
B
25
-
1425
-
V/
µs
-SR (Note 5)
B
25
-
900
-
V/
µs
Slew Rate
(VOUT = 5VP-P, AV = -1, RF = 332Ω)
+SR
B
25
-
2400
-
V/
µs
-SR (Note 5)
B
25
-
1350
-
V/
µs
Settling Time
(VOUT = +2V to 0V step, Note 6)
To 0.1%
B
25
-
23
-
ns
To 0.05%
B
25
-
33
-
ns
To 0.025%
B
25
-
85
-
ns
Overdrive Recovery Time
VIN = ±2V
B
25
-
10
-
ns
VIDEO CHARACTERISTICS
AV = +2, RF = 464Ω, Unless Otherwise Specified
Differential Gain (f = 3.58MHz)
RL = 150Ω
B
25
-
0.03
-
%
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
5.6
5.8
6.1
mA/
Op Amp
A
Full
5.4
5.9
6.3
mA/
Op Amp
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 = 0V 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” text, and the pulse response graphs for details.
6. See Typical Performance Curves for more information.
Electrical Specifications
VSUPPLY = ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
(NOTE 3)
TEST
LEVEL
TEMP.
(oC)
MIN
TYP
MAX
UNITS
TABLE 1. OPTIMUM FEEDBACK RESISTOR
GAIN
(ACL)RF (Ω)
BANDWIDTH
(MHz)
-1
332
350
+1
464 (+RS = 432Ω)
300
+2
464
425
+5
215
270
+10
180
115
HFA1205


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