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PDF HFA1405 Data sheet ( Hoja de datos )
| Número de pieza | HFA1405 | |
| Descripción | Quad/ 560MHz/ Low Power/ Video Operational Amplifier | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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HFA1405
September 1998
File Number 3604.5
Quad, 560MHz, Low Power, Video
Operational Amplifier
The HFA1405 is a quad, high speed, low power current
feedback amplifier built with Intersil’s proprietary
complementary bipolar UHF-1 process.
These amplifiers deliver up to 560MHz bandwidth and
1700V/µs slew rate, on only 58mW of quiescent power. They
are specifically designed to meet the performance, power,
and cost requirements of high volume video applications.
The excellent gain flatness and differential gain/phase
performance make these amplifiers well suited for
component or composite video applications. Video
performance is maintained even when driving a back
terminated cable (RL = 150Ω), and degrades only slightly
when driving two back terminated cables (RL = 75Ω). RGB
applications will benefit from the high slew rates, and high
full power bandwidth.
The HFA1405 is a pin compatible, low power, high
performance upgrade for the popular Intersil HA5025, and
for the CLC414 and CLC415.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
PKG.
NO.
HFA1405IB
-40 to 85 14 Ld SOIC
M14.15
HFA1405IP
-40 to 85 14 Ld PDIP
E14.3
HA5025EVAL
High Speed Op Amp DIP Evaluation Board
Pinout
HFA1405
(PDIP, SOIC)
TOP VIEW
OUT 1 1
-IN 1 2 -
+IN 1 3
V+ 4
+IN 2 5
-
-IN 2 6
OUT 2 7
14 OUT 4
- 13 -IN 4
12 +IN 4
11 V-
10 +IN 3
-
9 -IN 3
8 OUT 3
Features
• Low Supply Current . . . . . . . . . . . . . . . . . 5.8mA/Op Amp
• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 1MΩ
• Wide -3dB Bandwidth (AV = +2) . . . . . . . . . . . . . . 560MHz
• Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 1700V/µs
• Gain Flatness (to 50MHz) . . . . . . . . . . . . . . . . . . . . ±0.03dB
• Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02%
• Differential Phase . . . . . . . . . . . . . . . . . . . . 0.03 Degrees
• All Hostile Crosstalk (5MHz). . . . . . . . . . . . . . . . . . -60dB
• Pin Compatible Upgrade to HA5025, CLC414, and
CLC415
Applications
• Flash A/D Drivers
• Professional Video Processing
• Video Digitizing Boards/Systems
• Multimedia Systems
• RGB Preamps
• Medical Imaging
• Hand Held and Miniaturized RF Equipment
• Battery Powered Communications
• High Speed Oscilloscopes and Analyzers
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HFA1405
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 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 HFA1405 design is
optimized for RF = 402Ω/510Ω (PDIP/SOIC) at a gain of +2.
Decreasing RF 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 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.
OPTIMUM FEEDBACK RESISTOR
GAIN
(ACL)
-1
RF (Ω)
PDIP/SOIC
310/360
BANDWIDTH (MHz)
PDIP/SOIC
360/420
+2 402/510
400/560
+6 500/500 (Note)
100/140
NOTE: RF = 500Ω is not the optimum value. It was chosen to
match the RF of the CLC414 and CLC415, for performance compar-
ison purposes. Performance at AV = +6 may be increased by reduc-
ing RF below 500Ω.
Non-inverting Input Source Impedance
For best operation, the DC source impedance seen by the
non-inverting input should be ≥ 50Ω. This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
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
undershoot on the negative portion of the output waveform (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 (10µF) tantalum in parallel with a small value
(0.1µF) 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 (RS) in series with the output
prior to the capacitance.
5
5 Page 
HFA1405
Typical Performance Curves VSUPPLY = ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
RL = 100Ω, Unless Otherwise Specified (Continued)
3
2 VOUT = 5VP-P
PDIP
1
0
-1
-2
-3
-4
0.3 1
AV = -1
AV = +2
AV = +6 (RF = 500Ω)
AV = +6
(RF = 150Ω)
10 100
FREQUENCY (MHz)
800
FIGURE 28. FULL POWER BANDWIDTH
2 AV = +2
VOUT = 200mVP-P
1 PDIP
0
-1
-2
-3
RF = 365Ω
RF = 390Ω
RF = 422Ω
RF = 510Ω
1 10 100 800
FREQUENCY (MHz)
FIGURE 29. FREQUENCY RESPONSE vs FEEDBACK RESISTOR
0.2
0.1
VOUT = 200mVP-P
PDIP
AV = +2
AV = +1 (RF = +RS = 510Ω)
0
-0.1
-0.2
AV = +6
AV = -1
-0.3 (RF = 150Ω)
1 10
FREQUENCY (MHz)
FIGURE 30. GAIN FLATNESS
100
-42
-43
-44
-45
-46
-47
-48
-49
-50
-51
-52
-53
-54
-55
-50
-25
20MHz
10MHz
0 25 50 75
TEMPERATURE (oC)
100 125
FIGURE 31. 2nd HARMONIC DISTORTION vs TEMPERATURE
-55
-56
-57
-58
-59
-60
-61
-62
-63
-64
-65
-66
-67
-50
-25
20MHz
10MHz
0 25 50 75
TEMPERATURE (oC)
100 125
FIGURE 32. 3rd HARMONIC DISTORTION vs TEMPERATURE
3.6
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
-50
AV = -1
+VOUT (RL= 100Ω)
|-VOUT| (RL= 50Ω)
|-VOUT| (RL= 100Ω)
+VOUT (RL= 50Ω)
-25 0 25 50 75 100
TEMPERATURE (oC)
125
FIGURE 33. OUTPUT VOLTAGE vs TEMPERATURE
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HFA1405.PDF ] | |
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