The HFA1109 is a high speed, low power, current feedback
amplifier built with Intersil’s proprietary complementary bipolar UHF-1 process. This amplifier features a unique combination of power and performance specifically tailored for
video applications.
The HFA1109 is a standard pinout op amp. It is a higher
performance, drop-in replacement (no feedback resistor
change required) for the CLC409.
If a comparably performing op amp with an output disable
function (useful for video multiplexing) is required, please
refer to the HFA1149 data sheet.
Ordering Information
PART NUMBER
(BRAND)
HFA1109IP-40 to 858 Ld PDIPE8.3
HFA1109IB (H1109)-40 to 858 Ld SOICM8.15
HFA11XXEVALDIP Evaluation Board for High Speed
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
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.
NOTES:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
2. Output is short circuit protected to ground. Brief short circuits to ground will not degrade reliability, however continuous (100% duty cycle)
output current must not exceed 30mA for maximum reliability.
To 0.1%B25-19-ns
To 0.05%B25-23-ns
To 0.01%B25-36-ns
Overdrive Recovery TimeV
= ±2VB25-5-ns
IN
VIDEO CHARACTERISTICS
Differential Gain
(f = 3.58MHz)
= 150ΩB25-0.020.06%
R
L
BFull-0.030.09%
= 75ΩB25-0.040.09%
R
L
BFull-0.050.12%
Differential Phase
(f = 3.58MHz)
RL = 150ΩB25-0.020.06Degrees
BFull-0.020.06Degrees
RL = 75ΩB25-0.050.09Degrees
BFull-0.060.13Degrees
POWER SUPPLY CHARACTERISTICS
Power Supply RangeC25±4.5-±5.5V
Power Supply Current (Note 4)A25-9.610mA
AFull-1011mA
NOTES:
3. Test Level: A. Production Tested; B. Typical or Guaranteed Limit Based on Characterization; C. Design Typical for Information Only.
4. See Typical Performance Curves for more information.
4
Page 5
HFA1109
Application Information
Optimum Feedback Resistor
Although a current feedback amplifier’s bandwidth dependency on closed loop gain isn’t as severe as that of a v oltage
feedback amplifier, there can be an appreciable decrease in
bandwidth at higher gains. This decrease may be minimized
by taking advantage of the current feedback amplifier’s
unique relationship between bandwidth and R
feedback amplifiers require a feedback resistor, even for
unity gain applications, and R
, in conjunction with the inter-
F
nal compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier’s bandwidth is
inversely proportional to R
mized for a 250Ω R
. The HFA1109 design is opti-
F
at a gain of +2. Decreasing R
F
decreases stability, resulting in excessive peaking and overshoot (Note: Capacitive feedback will cause the same problems due to the feedback impedance decrease at higher
frequencies). At higher gains the amplifier is more stable, so
R
can be decreased in a trade-off of stability for bandwidth.
F
TABLE 1. OPTIMUM FEEDBACK RESISTOR
GAIN (ACL)R
-1200400
+1250 (+RS= 550Ω) PDIP
250 (+RS= 700Ω) SOIC
+2250450
+5100160
+109070
Table 1 lists recommended R
(Ω)BANDWIDTH (MHz)
F
values, and the expected
F
bandwidth, for various closed loop gains. For a gain of +1, a
resistor (
+R
) in series with +IN is required to reduce gain
S
peaking and increase stability
. All current
F
350
ble oscillations. In most cases, the oscillation can be avoided
by placing a resistor (R
) in series with the output prior to
S
the capacitance.
R
and CL form a low pass network at the output, thus limit-
S
ing system bandwidth well below the amplifier bandwidth. By
decreasing R
as CL increases, the maximum bandwidth is
S
obtained without sacrificing stability. In spite of this, bandwidth still decreases as the load capacitance increases.
Evaluation Board
The performance of the HFA1109 may be evaluated using
the HFA11XX evaluation board (part number
HFA11XXEVAL). Please contact your local sales office for
F
information. When evaluating this amplifier, the two 510Ω
gain setting resistors on the evaluation board should be
changed to 250Ω.
The layout and schematic of the board are shown in Figure 1.
.
510Ω
50Ω
IN
0.1µF10µF
BOARD SCHEMATIC
510Ω
1
2
3
4
-5V
TOP LAYOUT
GND
V
H
8
7
50Ω
6
5
OUT
V
GND
10µF0.1µF
+5V
L
PC Board Layout
The frequency response of this amplifier depends greatly on
the 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 par allel with a
small value (0.1µF) chip capacitor works well in most cases.
Terminated microstr ip 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. Thus 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 possi-
V
H
1
+IN
OUT
V
BOTTOM LAYOUT
FIGURE 1. EVALUATION BOARD SCHEMATIC AND LAYOUT
V+
L
V-
GND
5
Page 6
HFA1109
Typical Performance Curves V
200
AV = +2
150
100
50
0
-50
OUTPUT VOLTAGE (mV)
-100
-150
-200
FIGURE 2. SMALL SIGNAL PULSE RESPONSEFIGURE 3. LARGE SIGNAL PULSE RESPONSE
200
AV = +1
150
TIME (5ns/DIV.)
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL = 100Ω, Unless Otherwise Specified
2.0
AV = +2
1.5
1.0
0.5
0
-0.5
OUTPUT VOLTAGE (V)
-1.0
-1.5
-2.0
2.0
AV = +1
1.5
TIME (5ns/DIV.)
100
50
0
-50
OUTPUT VOLTAGE (mV)
-100
-150
-200
TIME (5ns/DIV.)
1.0
0.5
-0.5
OUTPUT VOLTAGE (V)
-1.0
-1.5
-2.0
0
TIME (5ns/DIV.)
FIGURE 4. SMALL SIGNAL PULSE RESPONSEFIGURE 5. LARGE SIGNAL PULSE RESPONSE
200
150
100
50
0
-50
OUTPUT VOLTAGE (mV)
-100
AV = -1
2.0
1.5
1.0
0.5
-0.5
OUTPUT VOLTAGE (V)
-1.0
AV=-1
0
-150
-200
TIME (5ns/DIV.)
-1.5
-2.0
TIME (5ns/DIV.)
FIGURE 6. SMALL SIGNAL PULSE RESPONSEFIGURE 7. LARGE SIGNAL PULSE RESPONSE
6
Page 7
HFA1109
Typical Performance Curves V
SUPPLY
RL = 100Ω, Unless Otherwise Specified (Continued)
200
150
= +5
A
V
100
50
0
-50
OUTPUT VOLTAGE (mV)
-100
-150
-200
AV = +10
AV = +5
TIME (5ns/DIV.)
A
V
FIGURE 8. SMALL SIGNAL PULSE RESPONSE
V
= 200mV
OUT
3
0
GAIN (dB)
-3
0.3110100700
P-P
GAIN
PHASE
FREQUENCY (MHz)
AV = +1
AV = -1
AV = +1
AV = -1
FIGURE 10. FREQUENCY RESPONSEFIGURE 11. FREQUENCY RESPONSE
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
2.0
1.5
AV = +5
1.0
= +10
0.5
-0.5
OUTPUT VOLTAGE (V)
-1.0
-1.5
-2.0
AV = +10
0
TIME (5ns/DIV.)
FIGURE 9. LARGE SIGNAL PULSE RESPONSE
V
= 200mV
AV = +1
OUT
3
0
-3
NORMALIZED GAIN (dB)
0
90
180
270
NORMALIZED PHASE (DEGREES)
0.3110100700
P-P
GAIN
AV = +10
PHASE
AV = +10
FREQUENCY (MHz)
AV = +5
AV = +2
AV = +5
AV = +5
AV = +2
A
= +10
V
0
90
180
270
PHASE (DEGREES)
V
= 200mV
OUT
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
NORMALIZED GAIN (dB)
-0.6
-0.7
110100500
P-P
AV = +2
FREQUENCY (MHz)
FIGURE 12. GAIN FLATNESSFIGURE 13. OPEN LOOP TRANSIMPEDANCE
AV = +1
7
116
106
)
96
I
O
I
86
V
()
76
66
56
(dB, 20 LOG
46
ZOL
36
A
26
0.010.1
0.313 6 10 30 100500
FREQUENCY (MHz)
0
45
90
135
180
PHASE (DEGREES)
Page 8
HFA1109
Typical Performance Curves V
-30
AV=+1
-40
-50
50MHz
-60
20MHz
-70
DISTORTION (dBc)
-80
-90
-6-3091236
FIGURE 14. 2nd HARMONIC DISTORTION vs P
-30
AV=+2
-40
-50
-60
-70
DISTORTION (dBc)
-80
100MHz
20MHz
OUTPUT POWER (dBm)
50MHz
10MHz
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL = 100Ω, Unless Otherwise Specified (Continued)
-20
=+1
A
100MHz
10MHz
OUT
V
-30
-40
-50
-60
-70
DISTORTION (dBc)
-80
-90
-100
-6-30912
OUTPUT POWER (dBm)
FIGURE 15. 3rd HARMONIC DISTORTION vs P
-30
AV=+2
-40
-50
-60
-70
DISTORTION (dBc)
-80
100MHz
20MHz
50MHz
10MHz
36
OUT
100MHz
50MHz
20MHz
10MHz
-90
-6-309121536
FIGURE 16. 2nd HARMONIC DISTORTION vs P
-20
V
= 2V
OUT
-30
-40
-50
-60
DISTORTION (dBc)
-70
-80
AV=+1
0 102030405060708090100
OUTPUT POWER (dBm)
OUT
P-P
AV= +2, -1
FREQUENCY (MHz)
-90
-6-309121536
FIGURE 17. 3rd HARMONIC DISTORTION vs P
-20
V
= 2V
OUT
-30
-40
-50
-60
DISTORTION (dBc)
-70
AV=+1
-80
0 102030405060708090100
OUTPUT POWER (dBm)
OUT
P-P
AV=+1
AV=-1
AV=+2
FREQUENCY (MHz)
FIGURE 18. 2nd HARMONIC DISTORTION vs FREQUENCYFIGURE 19. 3rd HARMONIC DISTORTION vs FREQUENCY
8
Page 9
HFA1109
Typical Performance Curves V
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL = 100Ω, Unless Otherwise Specified (Continued)
AV = +2
1K
100
10
1
0.1
0.01
OUTPUT RESISTANCE (Ω)
0.31101001000
FREQUENCY (MHz)
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
OUTPUT VOLTAGE (V)
2.0
1.8
1.6
+V
+V
OUT
(RL=50Ω)
OUT
|-V
OUT
-50
(RL= 100Ω)
| (RL= 100Ω)
-252575125-75
|-V
OUT
+V
(RL=50Ω)
OUT
|-V
| (RL=50Ω)
OUT
050100
TEMPERATURE (°C)
FIGURE 20. CLOSED LOOP OUTPUT RESISTANCEFIGURE 21. OUTPUT VOLTAGE vs TEMPERATURE
14
13.5
13
12.5
12
11.5
11
10.5
10
SUPPLY CURRENT (mA)
9.5
9
8.5
4.55.56.57.5
45678
SUPPLY VOLTAGE (±V)
17
16
15
14
13
12
11
10
9
8
7
SUPPLY CURRENT (mA)
6
5
4
-75050100
VS= ±8V
VS= ±5V
-50
VS= ±4V
-252575125
TEMPERATURE (°C)
FIGURE 22. SUPPLY CURRENT vs SUPPLY VOLTAGEFIGURE 23. SUPPLY CURRENT vs TEMPERATURE
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 f or 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 an y 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
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (321) 724-7000
FAX: (321) 724-7240
EUROPE
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Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
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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
12
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