1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright
Intersil Corporation 1999
HFA1110
750MHz, Low Distortion Unity Gain,
Closed Loop Buffer
The HFA1110 is a unity gain closed loop buffer that achieves
-3dB bandwidth of 750MHz, while offering excellent video
performance and low distortion. Manufactured on Intersil's
proprietary complementary bipolar UHF-1 process, the
HFA1110 also offers very fast slew rate, and high output
current. It is one more example of Intersil's intent to enhance
its leadership position in products for high speed signal
processing applications.
The HFA1110's settling time of 11ns to 0.1%, low distortion
and ability to drive capacitive loads make it an ideal flash
A/D driver.
The HFA1110 is an enhanced, pin compatible upgrade for
the AD9620, AD9630, CLC110, EL2072, BUF600 and
BUF601.
For buffer applications requiring a standard op amp pinout,
or selectable gain (-1, +1, +2), see the HFA1112 data sheet.
For output limiting see the HFA1113 data sheet.
For military grade product please refer to the HFA1110/883
data sheet.
Pinout
HFA1110
(SOIC)
TOP VIEW
Features
Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . . 750MHz
Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 1300V/
s
Fast Settling Time (0.2%) . . . . . . . . . . . . . . . . . . . . . . 7ns
High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
Fixed Gain of +1
Gain Flatness (100MHz) . . . . . . . . . . . . . . . . . . . . 0.03dB
Differential Phase . . . . . . . . . . . . . . . . . . . 0.025 Degrees
Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.04%
3rd Harmonic Distortion (50MHz). . . . . . . . . . . . . . -80dBc
3rd Order Intercept (100MHz) . . . . . . . . . . . . . . . . 30dBm
Applications
Video Switching and Routing
RF/IF Processors
Driving Flash A/D Converters
High-Speed Communications
Impedance Transformation
Line Driving
Radar Systems
Pin Descriptions
NAME
PIN
NUMBER
DESCRIPTION
V+
1
Positive Supply
Opt V+
2
Optional Positive Supply
NC
3
No Connection
IN
4
Input
V-
5
Negative Supply
Opt V-
6
Optional Negative Supply
NC
7
No Connection
OUT
8
Output
V+
OPT V+
NC
IN
1
2
3
4
8
7
6
5
OUT
NC
OPT V-
V-
+
-
Ordering Information
PART NUMBER
(BRAND)
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
HFA1110IB
(H1110I)
-40 to 85
8 Ld SOIC
M8.15
HFA1110EVAL
High Speed Buffer DIP Evaluation Board
Data Sheet
February 1999
File Number
2944.7
2
Absolute Maximum Ratings
Thermal Information
Voltage Between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V
DC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
SUPPLY
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
Thermal Resistance (Typical, Note 1)
JA
(
o
C/W)
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
158
Maximum Junction Temperature (Plastic Package) . . . . . . . .150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
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.
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
V
SUPPLY
=
5V, R
L
= 100
, Unless Otherwise Specified
PARAMETER
TEST CONDITIONS
TEMP (
o
C)
MIN
TYP
MAX
UNITS
INPUT CHARACTERISTICS
Output Offset Voltage (Note 2)
25
-
8
25
mV
Full
-
-
35
mV
Output Offset Voltage Drift
Full
-
10
-
V/
o
C
PSRR
25
39
45
-
dB
Full
35
-
-
dB
Input Noise Voltage (Note 2)
100kHz
25
-
14
-
nV/
Hz
Input Noise Current (Note 2)
100kHz
25
-
51
-
pA/
Hz
Input Bias Current (Note 2)
25
-
10
40
A
Full
-
-
65
A
Input Resistance
25
25
50
-
k
Input Capacitance
25
-
2
-
pF
TRANSFER CHARACTERISTICS
Gain
V
OUT
= 2V
P-P
25
0.980
0.990
1.02
V/V
Full
0.975
-
1.025
V/V
DC Non-Linearity (Note 2)
2V Full Scale
25
-
0.003
-
%
OUTPUT CHARACTERISTICS
Output Voltage (Note 2)
25
3.0
3.3
-
V
Full
2.5
3.0
-
V
Output Current (Note 2)
R
L
= 50
25, 85
50
60
-
mA
-40
35
50
-
mA
POWER SUPPLY CHARACTERISTICS
Supply Voltage Range
Full
4.5
-
5.5
V
Supply Current (Note 2)
25
-
21
26
mA
Full
-
-
33
mA
AC CHARACTERISTICS
-3dB Bandwidth (Note 2)
V
OUT
= 0.2V
P-P
25
-
750
-
MHz
Slew Rate
V
OUT
= 5V
P-P
25
-
1300
-
V/
s
Full Power Bandwidth (Note 2)
V
OUT
= 4V
P-P
25
-
150
-
MHz
Gain Flatness (Note 2)
To 100MHz
25
-
0.03
-
dB
To 30MHz
25
-
0.01
-
dB
Linear Phase Deviation (Note 2)
DC to 100MHz
25
-
0.3
-
Degrees
2nd Harmonic Distortion (Note 2)
50MHz, V
OUT
= 2V
P-P
25
-
-60
-
dBc
3rd Harmonic Distortion (Note 2)
50MHz, V
OUT
= 2V
P-P
25
-
-80
-
dBc
3rd Order Intercept (Note 2)
100MHz
25
-
30
-
dBm
HFA1110
3
Application Information
PC Board Layout
The frequency performance of this amplifier depends a great
deal 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 (10
F) tantalum in parallel with a small value
chip (0.1
F) capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
input and output of the device. Output capacitance, such as
that resulting from an improperly terminated transmission
line will degrade the frequency response of the amplifier and
may cause oscillations. In most cases, the oscillation can be
avoided by placing a resistor (R
S
) in series with the output.
See the "Recommended R
S
vs Load Capacitance" graph for
specific recommendations.
An example of a good high frequency layout is the
Evaluation Board shown below.
Evaluation Board
An evaluation board is available for the HFA1110 (part
number HFA1110EVAL). Please contact your local sales
office for information.
The layout and schematic of the board are shown here:
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.
-1dB Gain Compression
100MHz
25
-
14
-
dBm
Reverse Gain (S
12
, Note 2)
100MHz, V
OUT
= 1V
P-P
25
-
-60
-
dB
TRANSIENT RESPONSE
Rise Time
V
OUT
= 0.5V Step
25
-
0.5
-
ns
Overshoot (Note 2)
V
OUT
= 1.0V Step, Input Signal
Rise/Fall = 1ns
25
-
2.5
-
%
0.2% Settling Time (Note 2)
V
OUT
= 1V to 0V
25
-
7
-
ns
0.1% Settling Time (Note 2)
V
OUT
= 1V to 0V
25
-
11
-
ns
Overdrive Recovery Time
25
-
15
-
ns
Differential Gain
3.58MHz, R
L
= 75
25
-
0.04
-
%
Differential Phase
3.58MHz, R
L
= 75
25
-
0.025
-
Degrees
NOTE:
2. See Typical Performance Curves for more information.
Electrical Specifications
V
SUPPLY
=
5V, R
L
= 100
, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
TEMP (
o
C)
MIN
TYP
MAX
UNITS
50
1
2
3
4
8
7
6
5
+5V
0.1
F
10
F
50
OUT
0.1
F
10
F
-5V
HFA1110
IN
R
S
SCHEMATIC DIAGRAM
BOTTOM LAYOUT
TOP LAYOUT
1
HFA1110
4
Typical Performance Curves
V
SUPPLY
=
5V, T
A
= 25
o
C, R
L
= 100
,
Unless Otherwise Specified
FIGURE 1. SMALL SIGNAL PULSE RESPONSE
FIGURE 2. LARGE SIGNAL PULSE RESPONSE
FIGURE 3. FREQUENCY RESPONSE
FIGURE 4. FREQUENCY RESPONSE FOR VARIOUS LOAD
RESISTORS
FIGURE 5. FREQUENCY RESPONSE FOR VARIOUS OUTPUT
VOLTAGES
FIGURE 6. -3dB BANDWIDTH vs TEMPERATURE
TIME (5ns/DIV.)
120
80
40
0
-40
-80
-120
OUTPUT V
O
L
T
A
GE (mV)
1.2
0.8
0.4
0
-0.4
-0.8
-1.2
TIME (5ns/DIV.)
OUTPUT V
O
L
T
A
GE (V)
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
0
200M
400M
600M
800M
1G
FREQUENCY (Hz)
0
-45
-90
-135
-180
-225
-270
GAIN (dB)
PHASE (DEGREES)
PHASE
V
OUT
= 200mV
P-P
GAIN
V
OUT
= 200mV
P-P
V
OUT
= 1V
P-P
6
3
0
-3
-6
1M
10M
100M
1G
-360
-270
-180
-90
0
GAIN (dB)
FREQUENCY (Hz)
PHASE (DEGREES)
R
L
= 1k
R
L
= 100
R
L
= 50
R
L
= 1k
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
1M
10M
100M
1G
GAIN (dB)
FREQUENCY (Hz)
V
OUT
= 200mV
P-P
V
OUT
= 2.5V
P-P
V
OUT
= 4V
P-P
890
870
850
830
810
790
770
750
730
TEMPERATURE (
o
C)
-50
-30
-10
10
30
50
70
90
110
130
710
B
AND
WIDTH (MHz)
HFA1110
5
FIGURE 7. GAIN FLATNESS
FIGURE 8. DEVIATION FROM LINEAR PHASE
FIGURE 9. REVERSE GAIN AND PHASE (S
12
)
FIGURE 10. TWO-TONE, THIRD ORDER INTERMODULATION
INTERCEPT
FIGURE 11. SECOND HARMONIC DISTORTION vs P
OUT
FIGURE 12. THIRD HARMONIC DISTORTION vs P
OUT
Typical Performance Curves
V
SUPPLY
=
5V, T
A
= 25
o
C, R
L
= 100
,
Unless Otherwise Specified (Continued)
0.25
0.20
0.15
0.10
0.05
0
-0.05
-0.10
1M
10M
100M 200M
FREQUENCY (Hz)
GAIN (dB)
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0
15M 30M 45M 60M 75M 90M 105M 120M 135M 150M
FREQUENCY (Hz)
DEVIA
TION (DEGREES)
-20
-30
-40
-50
-60
0
200M
400M
600M
800M
1G
FREQUENCY (Hz)
+135
+90
+45
0
GAIN (dB)
PHASE
GAIN
V
OUT
= 1V
P-P
PHASE (DEGREES)
50
40
30
20
10
0
50
100
150
200
250
300
350
400
FREQUENCY (MHz)
INTERCEPT POINT (dBm)
0
-30
-40
-50
-60
-70
-80
-90
-100
-5
-3
-1
1
3
5
7
9
11
13
OUTPUT POWER (dBm)
DIST
OR
TION (dBc)
100 MHz
50 MHz
30 MHz
100 MHz
50 MHz
30 MHz
-30
-40
-50
-60
-70
-80
-90
-100
-5
-3
-1
1
3
5
7
9
11
13
OUTPUT POWER (dBm)
DIST
OR
TION (dBc)
HFA1110
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