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PDF HFA1112 Data sheet ( Hoja de datos )
| Número de pieza | HFA1112 | |
| Descripción | 850MHz/ Low Distortion Programmable Gain Buffer Amplifier | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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HFA1112
September 1998
File Number 2992.5
850MHz, Low Distortion Programmable
Gain Buffer Amplifier
The HFA1112 is a closed loop Buffer featuring user
programmable gain and ultra high speed performance.
Manufactured on Intersil’s proprietary complementary
bipolar UHF-1 process, the HFA1112 offers a wide -3dB
bandwidth of 850MHz, very fast slew rate, excellent gain
flatness, low distortion and high output current.
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. Gain selection is accomplished via
connections to the inputs, as described in the “Application
Information” section. The result is a more flexible product,
fewer part types in inventory, and more efficient use of board
space.
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.
This amplifier is available with programmable output limiting
as the HFA1113. For applications requiring a standard buffer
pinout, please refer to the HFA1110 datasheet. For Military
product, refer to the HFA1112/883 data sheet.
Pinout
HFA1112
(PDIP, SOIC)
TOP VIEW
NC 1
300
-IN 2
+IN 3
300
-
+
8 NC
7 V+
6 OUT
V- 4
5 NC
Pin Description
NAME
NC
-IN
+IN
V-
OUT
V+
PIN
NUMBER
1, 5, 8
2
3
4
6
7
DESCRIPTION
No Connection
Inverting Input
Non-Inverting Input
Negative Supply
Output
Positive Supply
Features
• User Programmable for Closed-Loop Gains of +1, -1 or +2
without Use of External Resistors
• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . . 850MHz
• Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 2400V/µs
• Fast Settling Time (0.1%) . . . . . . . . . . . . . . . . . . . . . 11ns
• High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
• Excellent Gain Accuracy . . . . . . . . . . . . . . . . . . . 0.99V/V
• Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . . <10ns
• 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
• Related Literature
- AN9507, Video Cable Drivers Save Board Space
Ordering Information
PART NUMBER
(BRAND)
HFA1112IP
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 8 Ld PDIP
PKG.
NO.
E8.3
HFA1112IB
(H1112I)
HFA11XXEVAL
-40 to 85 8 Ld SOIC
M8.15
High Speed Op Amp DIP Evaluation Board
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  
HFA1112
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.
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 2.
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
LOAD CAPACITANCE (pF)
320
360 400
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
LOAD CAPACITANCE
Evaluation Board
The performance of the HFA1112 may be evaluated using
the HFA11XX Evaluation Board, slightly modified as follows:
1. Remove the 500Ω feedback resistor (R2), and leave the
connection open.
1. 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 layout and modified schematic of the board are shown
in Figure 2.
To order evaluation boards (part number HFA11XXEVAL),
please contact your local sales office.
∞ (AV = +1)
or 0Ω (AV = +2)
R1 1
50Ω 2
IN 3
10µF 0.1µF
4
-5V
VH
8 0.1µF
7
50Ω
6
10µF
+5V
OUT
5
GND
VL
GND
TOP LAYOUT
VH
1
+IN
VLOVU- T V+
GND
FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT
BOTTOM LAYOUT
5
5 Page 
HFA1112
Typical Performance Curves VSUPPLY = ±5V, TA = 25oC, RL = 100Ω, Unless Otherwise Specified (Continued)
60
VOUT = 1V
50
60
VOUT = 2V
50
40 40
AV = +1
30 30 AV = +1
20
10
0
100
AV = +2
AV = -1
300 500 700 900
INPUT RISE TIME (ps)
1100 1300
FIGURE 33. OVERSHOOT vs INPUT RISE TIME
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
5
6789
TOTAL SUPPLY VOLTAGE (V+ - V-, V)
10
FIGURE 35. SUPPLY CURRENT vs SUPPLY VOLTAGE
20
AV = +2
10
AV = -1
0
100 300 500 700 900 1100 1300
INPUT RISE TIME (ps)
FIGURE 34. OVERSHOOT vs INPUT RISE TIME
25
24
23
22
21
20
19
18
17
16
15
-50 -25
0 25 50 75
TEMPERATURE (oC)
100 125
FIGURE 36. SUPPLY CURRENT vs TEMPERATURE
3.6
AV = -1
3.5
3.4 +VOUT (RL= 50Ω)
3.3 +VOUT (RL= 100Ω)
3.2 |-VOUT| (RL= 100Ω)
3.1
3.0
2.9
2.8 |-VOUT| (RL= 50Ω)
2.7
2.6
-50
-25
0 25 50 75
TEMPERATURE (oC)
100 125
FIGURE 37. OUTPUT VOLTAGE vs TEMPERATURE
50 130
40 110
30 90
20 70
10
0
0.1
ENI
INI
1 10
FREQUENCY (kHz)
50
30
100
FIGURE 38. INPUT NOISE CHARACTERISTICS
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HFA1112.PDF ] | |
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