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參數資料
| 型號： | HFA1405IB |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Circular Connector; Body Material:Aluminum; Series:PT06; No. of Contacts:55; Connector Shell Size:22; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Circular Contact Gender:Pin; Insert Arrangement:22-55 |
| 中文描述： | VIDEO AMPLIFIER, PDSO14 |
| 文件頁數： | 5/13頁 |
| 文件大小： | 138K |
| 代理商： | HFA1405IB |
5
Application Information
Performance Differences Between PDIP and SOIC
The amplifiers comprising the HFA1405 are high frequency
current feedback amplifiers. As such, they are sensitive to
feedback capacitance which destabilizes the op amp and
causes overshoot and peaking. Unfortunately, the standard
quad op amp pinout places the amplifier’s output next to its
inverting input, thus making the package capacitance an
unavoidable parasitic feedback capacitor. The larger
parasitic capacitance of the PDIP requires an inherently
more stable amplifier, which yields a PDIP device with lower
performance than the SOIC device - see Electrical
Specification tables for details.
Because of these performance differences, designers
should evaluate and breadboard with the same package
style to be used in production.
Note that the “Typical Performance Curves” section has
separate pulse and frequency response graphs for each
package type. Graphs not labeled with a specific package
type are applicable to both packages.
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 HFA1405 design is
optimized for R
F
= 402
/510
(PDIP/SOIC) at a gain of +2.
Decreasing R
F
decreases stability, resulting in excessive
peaking and overshoot (Note: Capacitive feedback causes
the same problems due to the feedback impedance
decrease at higher frequencies). However, 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:
match the R
F
of the CLC414 and CLC415, for performance compar-
ison purposes. Performance at A
V
= +6 may be increased by reduc-
ing R
F
below 500
.
Non-inverting Input Source Impedance
For best operation, the DC source impedance seen by the
non-inverting input should be
≥
50
.
This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
R
F
= 500
is not the optimum value. It was chosen to
Pulse Undershoot
The HFA1405 utilizes a quasi-complementary output stage to
achieve high output current while minimizing quiescent supply
current. In this approach, a composite device replaces the
traditional PNP pulldown transistor. The composite device
switches modes after crossing 0V, resulting in added distortion
for signals swinging below ground, and an increased
undershootonthenegativeportionoftheoutputwaveform(see
Figure 6 and Figure 9). This undershoot isn’t present for small
bipolar signals, or large positive signals (see Figure 5 and
Figure 8).
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,
while a solid ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10
μ
F) tantalum in parallel with a small value
(0.1
μ
F) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
input and output of the device. Capacitance, parasitic or
planned, connected to the output must be minimized, or
isolated as discussed in the next section.
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 eventual instability. To reduce this
capacitance the designer should remove the ground plane
under traces connected to -IN, and keep connections to -IN
as short as possible.
An example of a good high frequency layout is the
Evaluation Board shown in Figure 3.
Driving Capacitive Loads
Capacitive loads, such as an A/D input, or an improperly
terminated transmission line 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 a resistor (R
S
) in series with the output
prior to the capacitance.
OPTIMUM FEEDBACK RESISTOR
GAIN
(A
CL
)
R
F
(
)
PDIP/SOIC
BANDWIDTH (MHz)
PDIP/SOIC
-1
310/360
360/420
+2
402/510
400/560
+6
500/500 (Note)
100/140
HFA1405
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相關代理商/技術參數 |
參數描述 |
|---|---|
| HFA1405IB96 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| HFA1405IP | 制造商:Rochester Electronics LLC 功能描述:OPAMP 4X 400MHZ CFB LOWPWR 14PDIP IND - Bulk |
| HFA140MD60C | 功能描述:DIODE HEXFRED 600V 99A TO-244AB RoHS:是 類別:半導體模塊 >> 二極管，整流器 系列:HEXFRED® 標準包裝:10 系列:- 電壓 - 在 If 時為正向 (Vf)（最大）:1.45V @ 30A 電流 - 在 Vr 時反向漏電:15µA @ 400V 電流 - 平均整流 (Io)（每個二極管）:30A 電壓 - (Vr)（最大）:400V 反向恢復時間(trr):65ns 二極管類型:標準 速度:快速恢復 = 200mA（Io） 二極管配置:2 個獨立式 安裝類型:底座安裝 封裝/外殼:ISOTOP 供應商設備封裝:ISOTOP? 包裝:管件 |
| HFA140MD60D | 功能描述:DIODE HEXFRED 600V 99A TO-244AB RoHS:是 類別:半導體模塊 >> 二極管，整流器 系列:HEXFRED® 標準包裝:10 系列:- 電壓 - 在 If 時為正向 (Vf)（最大）:1.45V @ 30A 電流 - 在 Vr 時反向漏電:15µA @ 400V 電流 - 平均整流 (Io)（每個二極管）:30A 電壓 - (Vr)（最大）:400V 反向恢復時間(trr):65ns 二極管類型:標準 速度:快速恢復 = 200mA（Io） 二極管配置:2 個獨立式 安裝類型:底座安裝 封裝/外殼:ISOTOP 供應商設備封裝:ISOTOP? 包裝:管件 |
| HFA140NH60 | 功能描述:DIODE HEXFRED 600V 140A HALF-PAK RoHS:是 類別:半導體模塊 >> 二極管，整流器 系列:HEXFRED® 標準包裝:10 系列:- 電壓 - 在 If 時為正向 (Vf)（最大）:1.45V @ 30A 電流 - 在 Vr 時反向漏電:15µA @ 400V 電流 - 平均整流 (Io)（每個二極管）:30A 電壓 - (Vr)（最大）:400V 反向恢復時間(trr):65ns 二極管類型:標準 速度:快速恢復 = 200mA（Io） 二極管配置:2 個獨立式 安裝類型:底座安裝 封裝/外殼:ISOTOP 供應商設備封裝:ISOTOP? 包裝:管件 |
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