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HFA1114EVAL [INTERSIL]

850MHz Video Cable Driving Buffer; 850MHz的视频电缆驱动缓冲器
HFA1114EVAL
型号： HFA1114EVAL
厂家： Intersil    Intersil
描述：

850MHz Video Cable Driving Buffer
850MHz的视频电缆驱动缓冲器

驱动
文件： 总5页 (文件大小：45K)
中文：  中文翻译
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HFA1114  
850MHz Video Cable Driving Buffer  
November 1996  
Features  
Description  
• Access to Summing Node Allows Circuit Customization  
The HFA1114 is a closed loop Buffer featuring user  
programmable gain and ultra high speed performance.  
Manufactured on Intersil’ proprietary complementary bipolar  
UHF-1 process, the HFA1114 offers a wide -3dB bandwidth  
of 850MHz, very fast slew rate, excellent gain flatness, low  
distortion and high output current.  
• 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  
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.  
Applications  
• RF/IF Processors  
For applications requiring a standard buffer pinout, please  
refer to the HFA1110 datasheet.  
• Driving Flash A/D Converters  
• High Speed Communications  
• Impedance Transformation  
• Line Driving  
Ordering Information  
PART NUMBER  
(BRAND)  
TEMP. RANGE  
PKG.  
NO.  
o
( C)  
PACKAGE  
8 Ld PDIP  
• Video Switching and Routing  
• Radar Systems  
HFA1114IP  
-40 to 85  
-40 to 85  
E8.3  
M8.15  
HFA1114IB  
(H1114I)  
8 Ld SOIC  
• Medical Imaging Systems  
HFA11XXEVAL  
DIP Evaluation Board for High Speed  
Op Amps  
Pinout  
Pin Descriptions  
HFA1114  
(PDIP, SOIC)  
TOP VIEW  
PIN  
NUMBER  
NAME  
NC  
DESCRIPTION  
No Connection  
1, 8  
2
-IN  
Inverting Input  
Non-Inverting Input  
Negative Supply  
Summing Node  
Output  
300  
NC  
-IN  
+IN  
V-  
1
2
3
4
8
7
6
5
NC  
V+  
+IN  
V-  
3
300  
-
4
+
OUT  
SN  
SN  
5
OUT  
V+  
6
7
Positive Supply  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
File Number 3151.3  
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999  
5-1  
HFA1114  
Absolute Maximum Ratings  
Thermal Information  
o
Voltage Between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V  
DC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V  
Differential Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V  
Thermal Resistance (Typical, Note 1)  
θJA ( C/W)  
SUPPLY  
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
130  
170  
o
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA  
Maximum Junction Temperature (Die). . . . . . . . . . . . . . . . . . . . 175 C  
Maximum Junction Temperature (Plastic Package) . . . . . . . . 150 C  
Maximum Storage Temperature Range . . . . . . . . . -65 C to 150 C  
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . 300 C  
o
o
o
Operating Conditions  
o
o
o
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -40 C to 85 C  
(SOIC - Lead Tips Only)  
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation  
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.  
NOTE:  
1. θ is measured with the component mounted on an evaluation PC board in free air.  
JA  
Electrical Specifications  
V
= ±5V, A = +1, R = 100Ω, Unless Otherwise Specified  
SUPPLY V L  
TEST  
CONDITIONS  
TEMP.  
( C)  
o
PARAMETER  
INPUT CHARACTERISTICS  
Output Offset Voltage  
MIN  
TYP  
MAX  
UNITS  
25  
Full  
Full  
25  
-
8
-
25  
mV  
mV  
-
35  
o
Output Offset Voltage Drift  
PSRR  
-
39  
35  
-
10  
45  
-
-
µV/ C  
-
dB  
dB  
Full  
25  
-
Input Noise Voltage  
100kHz  
100kHz  
9
-
-
nV/√Hz  
pA/√Hz  
µA  
Non-Inverting Input Noise Current  
Non-Inverting Input Bias Current  
25  
-
37  
25  
-
25  
-
40  
65  
-
Full  
25  
-
µA  
Non-Inverting Input Resistance  
Inverting Input Resistance  
Input Capacitance  
25  
240  
-
50  
300  
2
kΩ  
25  
360  
-
Ω
Either Input  
25  
pF  
Input Common Mode Range  
TRANSFER CHARACTERISTICS  
Gain  
Full  
±2.5  
±2.8  
-
V
A
= +1, V = +2V  
IN  
25  
Full  
25  
0.980  
0.975  
1.96  
1.95  
-
0.990  
-
1.02  
1.025  
2.04  
2.05  
-
V/V  
V/V  
V/V  
V/V  
%
V
A
= +2, V = +1V  
IN  
1.98  
-
V
Full  
25  
DC Non-Linearity  
A = +2, ±2V Full Scale  
0.02  
V
OUTPUT CHARACTERISTICS  
Output Voltage  
A
= -1  
25  
Full  
±3.0  
±2.5  
50  
±3.3  
±3.0  
60  
-
-
-
-
-
V
V
V
Output Current  
A
= -1, R = 50Ω  
25, 85  
mA  
mA  
Ω
V
L
o
-40 C  
35  
50  
Closed Loop Output Impedance  
A
= +2, DC  
25  
-
0.3  
V
5-2  
HFA1114  
Electrical Specifications  
V
= ±5V, A = +1, R = 100Ω, Unless Otherwise Specified (Continued)  
SUPPLY  
V
L
TEST  
CONDITIONS  
TEMP.  
( C)  
o
PARAMETER  
MIN  
TYP  
MAX  
UNITS  
POWER SUPPLY CHARACTERISTICS  
Supply Voltage Range  
Full  
25  
±4.5  
-
21  
-
±5.5  
26  
V
Supply Current  
-
-
mA  
mA  
Full  
33  
AC CHARACTERISTICS  
-3dB Bandwidth (V  
OUT  
= 0.2V  
)
A
= -1  
= +1  
= +2  
= -1  
= +1  
= +2  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
25  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
800  
850  
550  
2400  
1500  
1900  
220  
±0.015  
±0.07  
-53  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
MHz  
MHz  
MHz  
V/µs  
V/µs  
V/µs  
MHz  
dB  
P-P  
V
A
V
A
V
Slew Rate (V  
OUT  
= 5V  
P-P  
)
A
V
A
V
A
V
Full Power BW  
Gain Flatness  
Gain Flatness  
5V , A = +2  
P-P V  
To 30MHz, A = +2  
V
To 100MHz, A = +2  
dB  
V
2nd Harmonic Distortion  
3rd Harmonic Distortion  
3rd Order Intercept  
50MHz, V  
OUT  
= 2V  
P-P  
dBc  
dBc  
dBm  
dBm  
ps  
50MHz, V  
OUT  
= 2V  
P-P  
-68  
100MHz, A = +2  
28  
V
1dB Compression  
100MHz, A = +2  
19  
V
Rise Time (V  
= 0.5V Step)  
A
= +2  
= +1  
700  
480  
6
OUT  
V
A
ps  
V
Overshoot  
V
= 0.5V Step, A = +2  
V
%
OUT  
0.1% Settling Time  
0.05% Settling Time  
Overdrive Recovery Time  
Differential Gain  
V
= 2V to 0V  
= 2V to 0V  
11  
ns  
OUT  
V
15  
ns  
OUT  
8.5  
ns  
A = +1, 3.58MHz, R = 150Ω  
0.03  
0.02  
0.05  
0.04  
%
V
L
A = +2, 3.58MHz, R = 150Ω  
%
V
L
Differential Phase  
A = +1, 3.58MHz, R = 150Ω  
Degrees  
Degrees  
V
L
A = +2, 3.58MHz, R = 150Ω  
V
L
5-3  
HFA1114  
Application Information  
Closed Loop Gain Selection  
Figure 1 details starting points for the selection of this resis-  
tor. The points on the curve indicate the R and C combina-  
S
L
The HFA1114 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.  
tions 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.  
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.  
R
and C form a low pass network at the output, thus  
L
S
limiting system bandwidth well below the amplifier band-  
width of 850MHz. By decreasing R as C increases (as  
S
L
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.  
The table below summarizes these connections:  
CONNECTIONS  
GAIN  
For example, at A = +1, R = 50Ω, C = 30pF, the overall  
V
S
L
(A  
CL  
)
+INPUT (PIN 3)  
-INPUT (PIN 2)  
bandwidth is limited to 300MHz, and bandwidth drops to  
-1  
+1  
+2  
GND  
Input  
100MHz at A = +1, R = 5Ω, C = 340pF.  
V
S
L
Input  
NC (Floating)  
GND  
Input  
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
A
= +1  
V
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 resis-  
tors and chip capacitors is strongly recommended,  
while a solid ground plane is a must!  
A
= +2  
40  
V
0
0
80 120 160 200 240 280 320 360 400  
LOAD CAPACITANCE (pF)  
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.  
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs  
LOAD CAPACITANCE  
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.  
Evaluation Board  
The performance of the HFA1114 may be evaluated using  
the HFA11XX Evaluation Board, slightly modified as follows:  
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.  
2. Remove the 500Ω feedback resistor (R ), and leave the  
2
connection open.  
3. a. For A = +1 evaluation, remove the 500Ω gain setting  
V
resistor (R ), and leave pin 2 floating.  
1
b. For A = +2, replace the 500Ω gain setting resistor with  
V
a 0Ω resistor to GND.  
An example of a good high frequency layout is the Evaluation  
Board shown in Figure 2.  
4. Isolate Pin 5 from the stray board capacitance to minimize  
peaking and overshoot.  
Driving Capacitive Loads  
The layout and modified schematic of the board are shown in  
Figure 2.  
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 oscil-  
lations. In most cases, the oscillation can be avoided by placing a  
To order evaluation boards (part number HFA11XXEVAL),  
please contact your local sales office.  
resistor (R ) in series with the output prior to the capacitance.  
S
∞ (A = +1)  
TOP LAYOUT  
BOTTOM LAYOUT  
V
V
H
or 0Ω (A = +2)  
V
V
H
R
1
2
3
4
8
7
6
5
1
0.1µF  
50Ω  
10µF  
+5V  
1
50Ω  
+IN  
IN  
OUT  
OUT  
V+  
V
L
V-  
V
L
X
GND  
GND  
0.1µF  
10µF  
-5V  
GND  
FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT  
5-4  
HFA1114  
Die Characteristics  
DIE DIMENSIONS:  
PASSIVATION:  
63 mils x 44 mils x 19 mils  
Type: Nitride  
1600µm x 1130µm x 483µm  
Thickness: 4kÅ ±0.5kÅ  
METALLIZATION:  
TRANSISTOR COUNT:  
Type: Metal 1: AICu(2%)/TiW  
52  
Thickness: Metal 1: 8kÅ ±0.4kÅ  
SUBSTRATE POTENTIAL (Powered Up):  
Floating (Recommend Connection to V-)  
Type: Metal 2: AICu(2%)  
Thickness: Metal 2: 16kÅ ±0.8kÅ  
Metallization Mask Layout  
HFA1114  
NC  
+IN  
V-  
-IN  
NC  
NC  
SN  
V+  
OUT  
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.  
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without  
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate  
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which  
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.  
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com  
Sales Office Headquarters  
NORTH AMERICA  
EUROPE  
ASIA  
Intersil Corporation  
Intersil SA  
Mercure Center  
100, Rue de la Fusee  
1130 Brussels, Belgium  
TEL: (32) 2.724.2111  
FAX: (32) 2.724.22.05  
Intersil (Taiwan) Ltd.  
Taiwan Limited  
7F-6, No. 101 Fu Hsing North Road  
Taipei, Taiwan  
Republic of China  
TEL: (886) 2 2716 9310  
FAX: (886) 2 2715 3029  
P. O. Box 883, Mail Stop 53-204  
Melbourne, FL 32902  
TEL: (321) 724-7000  
FAX: (321) 724-7240  
5-5  

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