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PDF HFA1113 Data sheet ( Hoja de datos )
| Número de pieza | HFA1113 | |
| Descripción | 850MHz/ Low Distortion/ Output Limiting/ Programmable Gain/ Buffer Amplifier | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HFA1113
February 1999
File Number 1342.5
850MHz, Low Distortion, Output Limiting,
Programmable Gain, Buffer Amplifier
The HFA1113 is a high speed Buffer featuring user
programmable gain and output limiting coupled with ultra
high speed performance. This buffer is the ideal choice for
high frequency applications requiring output limiting,
especially those needing ultra fast overload recovery times.
The output limiting function allows the designer to set the
maximum positive and negative output levels, thereby
protecting later stages from damage or input saturation. The
sub-nanosecond overdrive recovery time quickly returns the
amplifier to linear operation following an overdrive condition.
A unique feature of the pinout allows the user to select a
voltage gain of +1, -1, or +2, without the use of any external
components, as described in the “Application Information”
section. Compatibility with existing op amp pinouts provides
flexibility to upgrade low gain amplifiers, while decreasing
component count. Unlike most buffers, the standard pinout
provides an upgrade path should a higher closed loop gain
be needed at a future date.
Component and composite video systems will also benefit
from this buffer’s performance, as indicated by the excellent
gain flatness, and 0.02%/0.04 Degree Differential
Gain/Phase specifications (RL = 150Ω).
For Military product, refer to the HFA1113/883 data sheet.
Ordering Information
PART NUMBER
TEMP.
(BRAND)
RANGE (oC)
PACKAGE
HFA1113IB
(H1113I)
-40 to 85 8 Ld SOIC
PKG.
NO.
M8.15
HFA11XXEVAL DIP Evaluation Board For High Speed Op Amps
Pinout
HFA1113
(SOIC)
TOP VIEW
NC 1
300
-IN 2
+IN 3
300
-
+
V- 4
8 VH
7 V+
6 OUT
5 VL
Features
• User Programmable Output Voltage Limiting
• User Programmable For Closed-Loop Gains of +1, -1 or
+2 Without Use of External Resistors
• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . . 850MHz
• Excellent Gain Flatness (to 100MHz). . . . . . . . . . ±0.07dB
• Low Differential Gain and Phase . . . 0.02%/0.04 Degrees
• Low Distortion (HD3, 30MHz). . . . . . . . . . . . . . . . . -73dBc
• Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . 2400V/µs
• Fast Settling Time (0.1%) . . . . . . . . . . . . . . . . . . . . . 13ns
• High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
• Excellent Gain Accuracy . . . . . . . . . . . . . . . . . . . 0.99V/V
• Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . . . <1ns
• Standard Operational Amplifier Pinout
Applications
• RF/IF Processors
• Driving Flash A/D Converters
• High-Speed Communications
• Impedance Transformation
• Line Driving
• Video Switching and Routing
• Radar Systems
• Medical Imaging Systems
Pin Descriptions
NAME
PIN
NUMBER
NC 1
-IN 2
+IN 3
V- 4
VL
OUT
5
6
V+ 7
VH 8
DESCRIPTION
No Connection
Inverting Input
Non-Inverting Input
Negative Supply
Lower Output Limit
Output
Positive Supply
Upper Output Limit
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
1 page  
HFA1113
Application Information
Closed Loop Gain Selection
The HFA1113 features a novel design which allows the user
to select from three closed loop gains, without any external
components. The result is a more flexible product, fewer part
types in inventory, and more efficient use of board space.
This “buffer” operates in closed loop gains of -1, +1, or +2,
and gain selection is accomplished via connections to the
±Inputs. Applying the input signal to +IN and floating -IN
selects a gain of +1, while grounding -IN selects a gain of
+2. A gain of -1 is obtained by applying the input signal to
-IN with +IN grounded.
The table below summarizes these connections:
GAIN (ACL)
-1
+1
+2
CONNECTIONS
+INPUT
(PIN 3)
-INPUT
(PIN 2)
GND
Input
Input
NC (Floating)
Input
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
chip (0.1µF) 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.
For unity gain applications, care must also be taken to
minimize the capacitance to ground seen by the amplifier’s
inverting input. At higher frequencies this capacitance will
tend to short the -INPUT to GND, resulting in a closed loop
gain which increases with frequency. This will cause
excessive high frequency peaking and potentially other
problems as well.
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.
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 850MHz. By decreasing RS as CLincreases (as illustrated
in the curves), the maximum bandwidth is obtained without
sacrificing stability. Even so, bandwidth does decrease as
you move to the right along the curve. For example, at
AV = +1, RS = 50Ω, CL = 30pF, the overall bandwidth is
limited to 300MHz, and bandwidth drops to 100MHz at
AV = +1, RS = 5Ω, CL = 340pF.
50
45
40 AV = +1
35
30
25
20
15
10
5 AV = +2
0
0 40
80
120 160 200 240
280 320
360 400
LOAD CAPACITANCE (pF)
FIGURE 1. RECOMMENDED SERIES RESISTOR vs LOAD
CAPACITANCE
Evaluation Board
The performance of the HFA1113 may be evaluated using
the HFA11XX Evaluation Board, slightly modified as follows:
1. Remove the 500Ω feedback resistor (R2), and leave the
connection open.
2. a. For AV = +1 evaluation, remove the 500Ω gain setting
resistor (R1), and leave pin 2 floating.
b. For AV = +2, replace the 500Ω gain setting resistor with
a 0Ω resistor to GND.
The modified schematic and layout of the board are shown
in Figures 2 and 3.
To order evaluation boards (part number HFA11XXEVAL),
please contact your local sales office.
NOTE: The SOIC version may be evaluated in the DIP board by
using a SOIC-to-DIP adapter such as Aries Electronics Part Number
08-350000-10.
5
5 Page 
HFA1113
Typical Performance Curves VSUPPLY = ±5V, TA = 25oC, RL = 100Ω, Unless Otherwise Specified (Continued)
20
18
16
14
12
10
8
6
4
2
0
100
AV = -1
AV = +2
AV = +1
200 300 400
FREQUENCY (MHz)
500
30
20
10
0
100
2 - TONE
AV = -1
AV = +2
AV = +1
200 300
FREQUENCY (MHz)
400
FIGURE 25. 1dB GAIN COMPRESSION vs FREQUENCY
FIGURE 26. THIRD ORDER INTERMODULATION INTERCEPT
vs FREQUENCY
-20
AV = +2
-30
-40
-50
-60
-70
-80
-90
-100
-6
-3
100MHz
50MHz
30MHz
03 6 9
OUTPUT POWER (dBm)
12
15
FIGURE 27. SECOND HARMONIC DISTORTION vs POUT
-20
AV = +1
-30
-40
-50
-60
-70 100MHz 50MHz 30MHz
-80
-90
-100
-6
-3
03 6 9
OUTPUT POWER (dBm)
12 15
FIGURE 29. SECOND HARMONIC DISTORTION vs POUT
-20
AV = +2
-30
-40
-50
-60
-70
-80
50MHz 30MHz
-90 100MHz
-100
-6 -3 0
3
6 9 12
OUTPUT POWER (dBm)
15 18
FIGURE 28. THIRD HARMONIC DISTORTION vs POUT
-20
AV = +1
-30
-40
-50
-60
-70
-80
-90
-100
-6
100MHz
30MHz
50MHz
-3 0 3 6 9
OUTPUT POWER (dBm)
12 15
FIGURE 30. THIRD HARMONIC DISTORTION vs POUT
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HFA1113.PDF ] | |
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