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參數(shù)資料
| 型號： | HFA1205IB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT06; No. of Contacts:55; Connector Shell Size:22; Connecting Termination:Solder; Circular Shell Style:Straight Plug |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HFA1205IB |
4
Application Information
Optimum Feedback Resistor
Although a current feedback amplifier’s bandwidth dependency
onclosedloopgainisn’tas severeasthatofavoltagefeedback
amplifier, therecan beanappreciable decreaseinbandwidth 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 HFA1205 design is optimized
for a 464
R
F
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 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 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
V
OUT
= 0.5V
P-P
,
V
IN
t
RISE
= 2.5ns
B
25
-
5
-
%
Slew Rate
(V
OUT
= 4V
P-P
, A
V
= +1, +R
S
= 432
)
+SR
B
25
-
1050
-
V/
μ
s
-SR
B
25
-
750
-
V/
μ
s
Slew Rate (V
OUT
= 5V
P-P
, A
V
= +2)
+SR
B
25
-
1375
-
V/
μ
s
-SR
B
25
-
875
-
V/
μ
s
Slew Rate
(V
OUT
= 5V
P-P
, A
V
= -1, R
F
= 332
)
+SR
B
25
-
2250
-
V/
μ
s
-SR
B
25
-
1275
-
V/
μ
s
Settling Time (V
OUT
= +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
V
IN
=
±
2V
B
25
-
10
-
ns
VIDEO CHARACTERISTICS
A
V
= +2, R
F
= 464
,
Unless Otherwise Specified
Differential Gain (f = 3.58MHz)
R
L
= 150
B
25
-
0.03
-
%
R
L
= 75
B
25
-
0.03
-
%
Differential Phase (f = 3.58MHz)
R
L
= 150
B
25
-
0.03
-
Degrees
R
L
= 75
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
V
SUPPLY
=
±
5V, A
V
= +1, R
F
= 560
, R
L
= 100
, Unless Otherwise Specified
(Continued)
PARAMETER
TEST CONDITIONS
(NOTE 3)
TEST
LEVEL
TEMP.
(
o
C)
MIN
TYP
MAX
UNITS
GAIN
(A
CL
)
R
F
(
)
BANDWIDTH
(MHz)
-1
332
360
+1
464 (+R
S
= 432
)
280
+2
464
400
HFA1205
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