450MHz, Low Power, Video Operational
Amplifier with Programmable Output
Disable
The HFA1149 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 HFA1149 incorporates an output disable pin which is
TTL/CMOS compatible, and user programmable for polarity
(active high or low). This feature eliminates the inverter
required between amplifiers in multiplexer configurations.
The ultra-fast (12ns/20ns) disable/enable times make the
HFA1149 the obvious choice for pixel switching and other
high speed multiplexingapplications.TheHFA1149isahigh
performance, pin compatible upgrade f or the popular HA-5020
and HFA1145, as well as the CLC410.
For a comparably performing op amp without an output
disable, please refer to the HFA1109 data sheet.
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 isshort circuitprotected to ground.Brief shortcircuits toground will notdegrade reliability,however, continuous(100% dutycycle) 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 TimeVIN = ±2VB25-5-ns
VIDEO CHARACTERISTICS
Differential Gain
(f = 3.58MHz)
RL = 150ΩB25-0.020.06%
BFull-0.030.09%
RL = 75ΩB25-0.040.09%
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
HFA1149 DISABLE CHARACTERISTICS Polarity Set = Floating, Threshold Set = Floating, Unless Otherwise Specified
Disabled Supply CurrentV
= 0VAFull-2.83.5mA
DIS
Digital Input Logic Low (Note 4)AFull--0.8V
Digital Input Logic High (Note 4)A252.0--V
AFull2.2--V
Digital Input Logic Low Current (Note 4)V
Digital Input Logic High Current (Note 4)V
Output Disable Time (Note 5)VIN = ±0.5V,
V
Output Enable Time (Note 5)VIN = ±0.5V,
V
Disabled Output CapacitanceV
Disabled Output LeakageV
V
Off Isolation
(V
= 0V, VIN = 1V
DIS
P-P
, Note 5)
At 10MHzB25--64-dB
At 30MHzB25--54-dB
= 0VAFull-100200µA
DIGITAL
= 5VAFull-115µA
DIGITAL
B25-12-ns
= 2.4V to 0V
DIS
B25-20-ns
= 0V to 2.4V
DIS
= 0VB25-2.5-pF
DIS
= 0V, VIN = 2V,
DIS
= ±3V
OUT
±
AFull-310µA
NOTES:
3. Test Level: A. Production tested; B. Typical or guaranteed limit based on characterization; C. Design Typical for information only.
4. Digital inputs are Polarity Set and DIS / DIS.
5. See Typical Performance Curves for more information.
4
Page 5
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
voltage 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
All current feedback amplifiers require a feedback resistor,
even for unity gain applications, and R
, in conjunction with
F
the internal compensation capacitor, sets the dominant pole
of thefrequencyresponse.Thus, the amplifier’sbandwidth is
inversely proportional to R
optimized for a 250Ω R
. The HFA1149 design is
F
at a gain of +2. Decreasing R
F
decreases stability, resulting in excessive peaking and
overshoot (Note: Capacitive feedback will cause the same
problemsduetothe feedback impedancedecreaseat 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
-1200375
+1250 (+RS = 700Ω)330
+2250450
+5100160
+109070
(Ω)BANDWIDTH (MHz)
F
Table 1 lists recommended RF values, and the expected
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
Output Disable Function
The HFA1149incorporates an output disable function that is
useful for reducing power dissipation or for multiplexing
signals onto a common analog bus. When disabled, the
inverting input and the output become high impedances
(however, the feedback network for gains other than +1 still
present a load to ground from the output), the supply current
reduces by 68%, and the input to output isolation becomes
greater than 60dB. The amplifier is disabled by driving the
DIS / DIS input to its active state.
The active state of the DIS / DIS input is user programmable
via the HFA1149’s Polarity Set input (see next paragraph). If
the Polarity Set input is left floating, or is tied to a logic high
(e.g., V+), then the disable function is activated by a logic
low on the
amps). If the Polarity Set input is connected to a logic low
(e.g., GND), thenalogichighon the
the amplifier.
DIS / DIS input (typical of most output disable op
DIS / DIS input disables
.
F
F
HFA1149
The
DIS / DIS input is TTL compatible, and unlike most
competitive devices, the TTL compatibility can be
maintained when the HFA1149 is operated at supplies other
than ±5V (see the “Threshold Set input” section below).
An internal resistive bias network ensures that the
DIS / DIS
pin is pulled high if it is undriven on the PCB.
Polarity Set Input
A novel feature of the HFA1149 is the polarity
programmability of the disable control pin (
DIS / DIS).
Depending on the state of the Polarity Set input (pin 5), the
designer can define the active state to be high or low for the
DIS / DIS input (see the “HFA1149 Disable Functionality”
table on the front page). With this feature, a 2:1 multiplexer
can be created by defining one amplifier’s disable control as
active low (Polarity Set = High or floating), and the other
amplifier’s control as active high (Polarity Set = Low). Note
that if the Polarity Set pin is left floating, an internal pull-up
resistor pulls the pin high, and the HFA1149 becomes a
drop-in replacement for any standard ±5V supply op amp
with output disable (e.g., CLC410, CLC411, CLC430,
HA-5020, HFA1145, AD810). Likewise, if the disable and
polarity set pins are both floated, the HFA1149 works just
like a standard op amp (i.e., the output is always enabled).
Threshold Set Input for TTL Compatibility
The HFA1149derivesaninternal threshold reference forthe
digital circuitry as long as the power supplies are nominally
±5V. This reference is used to ensure the TTL compatibility
of the
DIS / DIS and Polarity Set inputs. With symmetrical
±5V supplies the Threshold Set pin(Pin1)mustbe floated to
guarantee TTL compatibility. If asymmetrical supplies (e.g.,
+10V, 0V) are utilized, and TTL compatibility is desired, the
Threshold Set pin must be connected to an external voltage
(e.g., GND for +10V, 0V operation). The following equation
should be used to determine the voltage (V
applied to the Threshold Set pin:
V
THSET
where V
1.58 V
DIGTH
is the desired switching point (typically 1.4V
DIGTH
V-
1.6V+()
----- -–0.46 V+(),–=
8
for TTL compatibility) of the Polarity Set and
inputs.
Figure 1 illustrates the input impedanceoftheThresholdSet
pin for calculating the input current at a given V
V+
V
THSET
FIGURE 1. THRESHOLD SET INPUT IMPEDANCE
3kΩ
7kΩ
25kΩ
V-
THSET)
DIS / DIS
THSET
to be
.
5
Page 6
HFA1149
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 chipresistors 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.
Care must also be taken to minimize the capacitance to
ground seen by the amplifier’s inverting input (-IN). The
larger thiscapacitance,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
possible oscillations. In most cases, the oscillation can be
avoided by placing a resistor (R
prior to the capacitance.
) in series with the output
S
.
BOARD SCHEMATIC
510Ω
50Ω
IN
0.1µF10µF
510Ω
1
2
3
4
-5V
TOP LAYOUT
V
1
+IN
BOTTOM LAYOUT
V
H
8
7
50Ω
6
5
GND
GND
H
OUT
V
V+
L
V-
GND
OUT
V
L
10µF0.1µF
+5V
R
and CL form a low pass network at the output, thus
S
limiting system bandwidth well below the amplifier
bandwidth. By decreasing R
as CL increases, the
S
maximum bandwidth is obtained without sacrificing stability.
In spite of this, bandwidth still decreases as the load
capacitance increases.
Evaluation Board
The performance of the HFA1149 may be evaluated using
the HFA11XX Evaluation Board (part number
HFA11XXEVAL). Please contact your local sales office for
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 2.
NOTE: The SOIC version may be evaluated in the DIP board by
using aSOIC-to-DIP adapter suchas Aries Electronics Part Number
08-350000-10.
FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT
6
Page 7
HFA1149
Typical Performance CurvesV
200
AV = +2
150
100
50
0
-50
OUTPUT VOLTAGE (mV)
-100
-150
-200
FIGURE 3. SMALL SIGNAL PULSE RESPONSE
200
AV = +1
150
100
TIME (5ns/DIV.)
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL= 100Ω, Unless Otherwise Specified
2.0
1.5
1.0
0.5
0
-0.5
OUTPUT VOLTAGE (V)
-1.0
-1.5
-2.0
FIGURE 4. LARGE SIGNAL PULSE RESPONSE
2.0
1.5
1.0
AV = +2
TIME (5ns/DIV.)
AV = +1
50
0
-50
OUTPUT VOLTAGE (mV)
-100
-150
-200
TIME (5ns/DIV.)
0.5
-0.5
OUTPUT VOLTAGE (V)
-1.0
-1.5
-2.0
0
TIME (5ns/DIV.)
FIGURE 5. SMALL SIGNAL PULSE RESPONSEFIGURE 6. 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 7. SMALL SIGNAL PULSE RESPONSEFIGURE 8. LARGE SIGNAL PULSE RESPONSE
7
Page 8
HFA1149
Typical Performance CurvesV
200
150
= +5
A
V
100
50
0
-50
OUTPUT VOLTAGE (mV)
-100
-150
-200
FIGURE 9. SMALL SIGNAL PULSE RESPONSEFIGURE 10. LARGE SIGNAL PULSE RESPONSE
DISABLE
800mV/DIV.
(0.4V TO 2.4V)
AV = +10
AV = +5
TIME (5ns/DIV.)
A
V
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL= 100Ω, Unless Otherwise Specified (Continued)
2.0
1.5
AV = +5
1.0
= +10
0.5
0
-0.5
OUTPUT VOLTAGE (V)
-1.0
-1.5
-2.0
V
OUT
3
0
GAIN (dB)
-3
= 200mV
AV = +10
P-P
TIME (5ns/DIV.)
GAIN
AV = +5
AV = +1
A
= +10
V
AV = +1
AV = -1
AV = +1
AV = -1
OUTPUT
400mV/DIV.
0
0
AV= +2, VIN = 0.5V
TIME (10ns/DIV.)
PHASE
0.3110100700
FREQUENCY (MHz)
FIGURE 11. OUTPUT ENABLE AND DISABLE RESPONSEFIGURE 12. FREQUENCY RESPONSE
510
V
= 200mV
OUT
3
0
-3
NORMALIZED GAIN (dB)
0.3110100700
P-P
GAIN
AV = +10
PHASE
AV = +10
FREQUENCY (MHz)
AV = +5
AV = +2
AV = +5
AV = +2
0
90
180
270
PHASE (DEGREES)
480
450
420
390
BANDWIDTH (MHz)
360
330
300
-75-50-250255075100125
AV = +2
AV = -1
AV = +1
TEMPERATURE (oC)
FIGURE 13. FREQUENCY RESPONSEFIGURE 14. -3dB BANDWIDTH vs TEMPERATURE
0
90
180
270
NORMALIZED PHASE (DEGREES)
8
Page 9
HFA1149
Typical Performance CurvesV
V
= 200mV
OUT
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
NORMALIZED GAIN (dB)
-0.6
-0.7
110100500
-30
AV=+1
-40
-50
-60
-70
DISTORTION (dBc)
-80
P-P
AV = +2
FREQUENCY (MHz)
FIGURE 15. GAIN FLATNESSFIGURE 16. OPEN LOOP TRANSIMPEDANCE
100MHz
50MHz
20MHz
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL= 100Ω, Unless Otherwise Specified (Continued)
116
AV = +1
10MHz
106
)
96
I
O
I
86
V
()
76
66
56
(dB, 20 LOG
46
ZOL
36
A
26
0.010.1
-20
A
-30
-40
-50
-60
-70
DISTORTION (dBc)
-80
-90
V
=+1
0.313 6 10 30 100500
FREQUENCY (MHz)
100MHz
50MHz
20MHz
10MHz
0
45
90
135
180
PHASE (DEGREES)
-90
-6-3091236
OUTPUT POWER (dBm)
FIGURE 17. 2nd HARMONIC DISTORTION vs P
-30
AV=+2
-40
-50
-60
-70
DISTORTION (dBc)
-80
-90
100MHz
50MHz
10MHz
20MHz
-6-309121536
OUTPUT POWER (dBm)
FIGURE 19. 2nd HARMONIC DISTORTION vs P
9
OUT
OUT
-100
-6-30912
OUTPUT POWER (dBm)
36
FIGURE 18. 3rd HARMONIC DISTORTION vs P
-30
AV=+2
-40
100MHz
-50
50MHz
-60
20MHz
-70
DISTORTION (dBc)
10MHz
-80
-90
-6-309121536
OUTPUT POWER (dBm)
FIGURE 20. 3rd HARMONIC DISTORTION vs P
OUT
OUT
Page 10
HFA1149
Typical Performance CurvesV
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL= 100Ω, Unless Otherwise Specified (Continued)
-20
V
= 2V
OUT
-30
-40
-50
-60
DISTORTION (dBc)
-70
-80
0 102030405060708090100
P-P
AV= +2, -1
AV=+1
FREQUENCY (MHz)
-20
V
= 2V
OUT
P-P
-30
-40
-50
-60
DISTORTION (dBc)
-70
AV=+1
-80
0 102030405060708090100
FREQUENCY (MHz)
AV = +1
AV = -1
AV = +2
FIGURE 21. 2nd HARMONIC DISTORTION vs FREQUENCYFIGURE 22. 3rd HARMONIC DISTORTION vs FREQUENCY
-30
-40
-50
-60
-70
-80
OFF ISOLATION (dB)
-90
-100
AV = +2
V
= 1V
IN
P-P
0.01
OUTPUT RESISTANCE (Ω)
AV = +2
1K
100
10
1
0.1
0.31101001000
FREQUENCY (MHz)
0.5100101
FREQUENCY (MHz)
FIGURE 23. CLOSED LOOP OUTPUT RESISTANCEFIGURE 24. OFF ISOLATION
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= 100Ω)
OUT
(RL=50Ω)
|-V
OUT
-50
| (RL= 100Ω)
-252575125-75
TEMPERATURE (°C)
|-V
| (RL= 100Ω)
OUT
+V
(RL=50Ω)
OUT
|-V
| (RL=50Ω)
OUT
050100
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)
FIGURE 25. OUTPUT VOLTAGE vs TEMPERATUREFIGURE 26. SUPPLY CURRENT vs SUPPLY VOLTAGE
10
Page 11
HFA1149
Typical Performance CurvesV
= ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table,
SUPPLY
RL= 100Ω, Unless Otherwise Specified (Continued)
17
16
15
14
13
12
11
10
9
8
SUPPLY CURRENT (mA)
7
6
5
4
-75050100
VS = ±8V
VS = ±5V
-50
VS = ±4V
-252575125
TEMPERATURE (
o
C)
100
I
NI+
10
NOISE VOLTAGE (nV/√Hz)
1
0.1110100
FREQUENCY (kHz)
FIGURE 27. SUPPLY CURRENT vs TEMPERATUREFIGURE 28. INPUT NOISE CHARACTERISTICS
A
= +2
V
V
= 2V
0.1
OUT
100
I
NI-
E
NI
I
NI+
Hz)
10
NOISE CURRENT (pA/√
1
0.05
0.025
-0.025
-0.05
SETTLING ERROR (%)
-0.1
0
108010090
305070204060
TIME (ns)
FIGURE 29. SETTLING RESPONSE
11
Page 12
Die Characteristics
HFA1149
DIE DIMENSIONS
59 mils x 80 mils x 19 mils
1500µm x 2020µm x 483µm
METALLIZATION
Type: Metal 1: AICu(2%)/TiW
Type: Metal 2: AICu(2%)
Thickness: Metal 1: 8k
Å ±0.4kÅ
Thickness: Metal 2: 16kű0.8kÅ
Metallization Mask Layout
THRESHOLD SET
GLASSIVATION
Type: Nitride
Thickness: 4kű0.5kÅ
TRANSISTOR COUNT
130
SUBSTRATE POTENTIAL (POWERED UP)
Floating (Recommend Connection to V-)
HFA1149
NC
DIS / DIS
NC
-IN
+IN
V+
OUT
NC
POLARITY SET
V-
NCNC
12
Page 13
Small Outline Plastic Packages (SOIC)
HFA1149
N
INDEX
AREA
123
-A-
E
-B-
SEATING PLANE
D
A
-C-
0.25(0.010)BMM
H
L
h x 45
o
α
e
B
0.25(0.010)C AMBS
M
NOTES:
1. Symbols are defined inthe “MO Series SymbolList” in Section 2.2of
Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” doesnot include moldflash, protrusions orgate burrs.
Mold flash,protrusion andgate burrs shallnot exceed0.15mm (0.006
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per
side.
5. The chamfer onthe body isoptional. If itis not present,a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. The lead width “B”, asmeasured 0.36mm (0.014 inch) orgreater
above the seating plane, shall not exceed a maximum value of
0.61mm (0.024 inch).
10. Controlling dimension: MILLIMETER. Convertedinch dimensions
are not necessarily exact.
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor productsare sold by description only. Intersil Corporation reserves the right to make changesin 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 believ edto 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 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
13
EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
Intersil Ltd.
8F-2, 96, Sec. 1, Chien-kuo North,
Taipei, Taiwan 104
Republic of China
TEL: 886-2-2515-8508
FAX: 886-2-2515-8369
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