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參數(shù)資料
| 型號： | HA5022EVAL |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual, 125MHz, Video Current Feedback Amplifier with Disable |
| 中文描述： | 雙通道，125MHz的，視頻電流反饋放大器禁用 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 169K |
| 代理商： | HA5022EVAL |
7
Application Information
Optimum Feedback Resistor
The plots of inverting and non-inverting frequency response,
see Figure 11 and Figure 12 in the Typical Performance
Curves section, illustrate the performance of the HA5022 in
various closed loop gain configurations. Although the
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
HA5022 design is optimized for a 1000
R
F
at a gain of +1.
Decreasing R
F
in a unity gain application decreases stability,
resulting in excessive peaking and overshoot. 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.
PC Board Layout
The frequency response of this amplifier depends greatly on
the amount of care taken in designing the PC board. The
use of low inductance components such as chip resistors
and chip capacitors is strongly recommended. If leaded
components are used the leads must be kept short
especially for the power supply decoupling components and
those components connected to the inverting input.
Attention must be given to decoupling the power supplies. A
large value (10
μ
F) tantalum or electrolytic capacitor in
parallel with a small value (0.1
μ
F) chip capacitor works well
in most cases.
A ground plane is strongly recommended to control noise.
Care must also be taken to minimize the capacitance to
ground seen by the amplifier’s inverting input (-IN). The
larger this capacitance, the worse the gain peaking, resulting
in pulse overshoot and possible instability. It is
recommended that the ground plane be removed under
traces connected to -IN, and that connections to -IN be kept
as short as possible to minimize the capacitance from this
node to ground.
Driving Capacitive Loads
Capacitive loads will degrade the amplifier’s phase margin
resulting in frequency response peaking and possible
oscillations. In most cases the oscillation can be avoided by
placing an isolation resistor (R) in series with the output as
shown in Figure 6.
100
The selection criteria for the isolation resistor is highly
dependent on the load, but 27
has been determined to be
a good starting value.
Power Dissipation Considerations
Due to the high supply current inherent in dual amplifiers,
care must be taken to insure that the maximum junction
temperature (T
J,
see Absolute Maximum Ratings) is not
exceeded. Figure 7 shows the maximum ambient
temperature versus supply voltage for the available package
styles (PDIP, SOIC). At V
S
=
±
5V quiescent operation both
package styles may be operated over the full industrial range
of -40
o
C to 85
o
C. It is recommended that thermal
calculations, which take into account output power, be
performed by the designer.
Enable/Disable Function
When enabled the amplifier functions as a normal current
feedback amplifier with all of the data in the electrical
specifications table being valid and applicable. When
GAIN
(A
CL
)
-1
R
F
(
)
750
BANDWIDTH
(MHz)
100
+1
1000
125
+2
681
95
+5
1000
52
+10
383
65
-10
750
22
V
IN
V
OUT
C
L
R
T
+
-
R
I
R
F
R
FIGURE 6. PLACEMENT OF THE OUTPUT ISOLATION
RESISTOR, R
140
130
120
110
100
90
80
5
7
9
11
13
15
M
SUPPLY VOLTAGE (
±
V)
PDIP
SOIC
FIGURE 7. MAXIMUM OPERATING AMBIENT
TEMPERATURE vs SUPPLY VOLTAGE
HA5022
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA5022 | Dual, 125MHz, Video Current Feedback Amplifier with Disable |
| HA5022IP | Dual, 125MHz, Video Current Feedback Amplifier with Disable |
| HA5022IB | Dual, 125MHz, Video Current Feedback Amplifier with Disable |
| HA5023883 | Dual 125MHz Video Current Feedback Amplifier |
| HA5023IP | Dual 125MHz Video Current Feedback Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA5022IB | 制造商:Rochester Electronics LLC 功能描述:OPAMP 2X 125MHZ CFB DISABLE 16SOIC IND - Bulk 制造商:Harris Corporation 功能描述: 制造商:Intersil Corporation 功能描述: |
| HA5022IP | 制造商:Rochester Electronics LLC 功能描述:DUAL 125MHZ VIDEO OP AMP WITH DISABLE,16 PDIP - Bulk |
| HA5022IP WAF | 制造商:Harris Corporation 功能描述: |
| HA5022MJ/883 | 制造商:Rochester Electronics LLC 功能描述:DUAL 100MHZ OP AMP, WITH DISABLE,MIL 16 CDIP - Bulk |
| HA5023 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual 125MHz Video Current Feedback Amplifier |
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