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HA5023EVAL Datasheet(PDF) 4 Page - Intersil Corporation

Part # HA5023EVAL
Description  Dual, 400MHz, Low Power, Video Operational Amplifier
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HA5023EVAL 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 RF 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.
The table below 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.
Overshoot
VOUT = 0.5VP-P,
VIN tRISE = 2.5ns
B
25
-5-
%
Slew Rate
(VOUT = 4VP-P, AV = +1, +RS = 432Ω)
+SR
B
25
-
1050
-
V/
µs
-SR
B
25
-
750
-
V/
µs
Slew Rate (VOUT = 5VP-P, AV = +2)
+SR
B
25
-
1375
-
V/
µs
-SR
B
25
-
875
-
V/
µs
Slew Rate
(VOUT = 5VP-P, AV = -1, RF = 332Ω)
+SR
B
25
-
2250
-
V/
µs
-SR
B
25
-
1275
-
V/
µs
Settling Time (VOUT = +2V to 0V step)
To 0.1%
B
25
-
15
-
ns
To 0.05%
B
25
-
20
-
ns
To 0.02%
B
25
-
30
-
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
A
25
5.6
5.8
6.1
mA/
Op Amp
A
Full
5.4
5.9
6.3
mA/
Op Amp
NOTE:
3. Test Level: A. Production Tested.; B. Typical or Guaranteed Limit Based on Characterization.; C. Design Typical for Information Only.
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
GAIN
(ACL)RF (Ω)
BANDWIDTH
(MHz)
-1
332
360
+1
464 (+RS = 432Ω)
280
+2
464
400
HFA1205


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