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| 型號(hào)： | HFA1145 |
| 廠商： | Intersil Corporation |
| 英文描述： | 330MHz, Low Power, Current Feedback Video Operational Amplifier with Output Disable(330MHz,低功率,電流反饋視頻運(yùn)放) |
| 中文描述： | 330MHz，低功耗，電流反饋運(yùn)算放大器，具有視頻輸出禁用（330MHz，低功率，電流反饋視頻運(yùn)放） |
| 文件頁(yè)數(shù)： | 5/13頁(yè) |
| 文件大小： | 419K |
| 代理商： | HFA1145 |
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5
FN3955.5
June 1, 2006
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 R
F
. All
current feedback amplifiers require a feedback resistor, even
for unity gain applications, and R
F
, in conjunction with the
internal compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier’s bandwidth is
inversely proportional to R
F
. The HFA1145 design is optimized
for R
F
= 510
Ω
at a gain of +2. Decreasing R
F
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, however, the amplifier is more stable so R
F
can
be decreased in a trade-off of stability for bandwidth.
The table below lists recommended R
F
values for various
gains, and the expected bandwidth. For a gain of +1, a
resistor (
+
R
S
) in series with +IN is required to reduce gain
peaking and increase stability.
Non-inverting Input Source Impedance
For best operation, the DC source impedance seen by the
non-inverting input should be
≥
50
Ω.
This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
DISABLE Input TTL Compatibility
The HFA1145 derives an internal GND reference for the
digital circuitry as long as the power supplies are
symmetrical about GND. With symmetrical supplies the
digital switching threshold (V
TH
= (V
IH
+ V
IL
)/2 = (2.0 +
0.8)/2) is 1.4V, which ensures the TTL compatibility of the
DISABLE input. If asymmetrical supplies (e.g. +10V, 0V) are
utilized, the switching threshold becomes:
2
and the V
IH
and V
IL
levels will be V
TH
±
0.6V, respectively.
DISABLE Input Logic High Current
V
DISABLE
= 5V
A
Full
-
1
15
μ
A
Output Disable Time (Note 6)
V
IN
=
±
1V,
V
DISABLE
= 2.4V to 0V
B
25
-
35
-
ns
Output Enable Time (Note 6)
V
IN
=
±
1V,
V
DISABLE
= 0V to 2.4V
B
25
-
180
-
ns
Disabled Output Capacitance
V
DISABLE
= 0V
B
25
-
2.5
-
pF
Disabled Output Leakage
V
DISABLE
= 0V, V
IN
= 2V,
V
OUT
=
±
3V
A
Full
-
3
10
μ
A
Off Isolation
(V
DISABLE
= 0V, V
IN
= 1V
P-P
, Note 6)
At 5MHz
B
25
-
-75
-
dB
At 25MHz
B
25
-
-60
-
dB
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. 0.5V
P-P
), yielding a higher overshoot limit compared to the V
OUT
= 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
V
SUPPLY
=
±
5V, A
V
= +1, R
F
= 510
Ω
, R
L
= 100
Ω,
Unless Otherwise Specified
(Continued)
PARAMETER
TEST CONDITIONS
(NOTE 3)
TEST
LEVEL
TEMP. (°C)
MIN
TYP
MAX
UNITS
GAIN
(A
CL
)
-1
R
F
(
Ω
)
425
BANDWIDTH
(MHz)
300
510 (+R
S
= 510
Ω
)
510
270
+2
330
+5
200
300
+10
180
130
V
TH
---------+
1.4V
+
=
HFA1145
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