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PDF HFA1205IB Data sheet ( Hoja de datos )
| Número de pieza | HFA1205IB | |
| Descripción | Dual/ 400MHz/ Low Power/ Video Operational Amplifier | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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HFA1205
September 1998
File Number 3605.5
Dual, 400MHz, Low Power, Video
Operational Amplifier
The HFA1205 is a dual, high speed, low power current
feedback amplifier built with Intersil’s proprietary
complementary bipolar UHF-1 process.
These amplifiers deliver 400MHz bandwidth and 1275V/µs
slew rate, on only 60mW 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 HFA1205 is a pin compatible, low power, high
performance upgrade for the popular Intersil HA5023. For a
dual amplifier with output disable capability, please see the
HFA1245 datasheet.
Ordering Information
PART NUMBER
TEMP.
(BRAND)
RANGE (oC)
PACKAGE
PKG.
NO.
HFA1205IP
-40 to 85 8 Ld PDIP
E8.3
HFA1205IB
(H1205I)
-40 to 85 8 Ld SOIC
M8.15
HA5023EVAL
High Speed Op Amp DIP Evaluation Board
Features
• Low Supply Current . . . . . . . . . . . . . . . . . 5.8mA/Op Amp
• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 2MΩ
• Wide -3dB Bandwidth (AV = +2) . . . . . . . . . . . . . . 400MHz
• Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 1275V/µs
• Gain Flatness (to 50MHz) . . . . . . . . . . . . . . . . . . . . ±0.03dB
• Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03%
• Differential Phase . . . . . . . . . . . . . . . . . . . . 0.03 Degrees
• Pin Compatible Upgrade to HA5023
Applications
• Flash A/D Drivers
• High Resolution Monitors
• Video Switching and Routing
• 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
Pinout
HFA1205
(PDIP, SOIC)
TOP VIEW
OUT1 1
-IN1 2
+IN1 3 +-
V- 4
8 V+
7 OUT2
6 -IN2
+- 5 +IN2
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  
HFA1205
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.
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 directly on 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 possible instability. To this end, it is
recommended that the ground plane be removed under
traces connected to -IN, and connections to -IN should be
kept as short as possible.
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.
Figure 1 details starting points for the selection of this
resistor. The points on the curve indicate the RS and CL
combinations for the optimum bandwidth, stability, and
settling time, but experimental fine tuning is recommended.
Picking a point above or to the right of the curve yields an
overdamped response, while points below or left of the curve
indicate areas of underdamped performance.
RS and CL form a low pass network at the output, thus
limiting system bandwidth well below the amplifier
bandwidth of 280MHz (for AV = +1). By decreasing RS as
CL increases (as illustrated in the curves), the maximum
bandwidth is obtained without sacrificing stability. In spite
of this, bandwidth decreases as the load capacitance
increases. For example, at AV = +1, RS = 62Ω, CL = 40pF,
the overall bandwidth is limited to 180MHz, and bandwidth
drops to 70MHz at AV = +1, RS = 8Ω, CL = 400pF.
50
40
30
20
AV = +1
10 AV = +2
0
0 50 100 150 200 250 300 350 400
LOAD CAPACITANCE (pF)
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
LOAD CAPACITANCE
Evaluation Board
The performance of the HFA1205 may be evaluated using
the HA5023 Evaluation Board. The feedback and gain
setting resistors must be replaced with the appropriate value
(see “Optimum Feedback Resistor” section) for the gain
being evaluated. Also, replace the two 0Ω series output
resistors with 50Ω resistors.
To order evaluation boards (Part Number HA5023EVAL),
please contact your local sales office.
5
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| PDF Descargar | [ Datasheet HFA1205IB.PDF ] | |
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