hfa1155

HFA1155
®
Data Sheet
September 2004
380MHz, SOT-23, Low Power Current
Feedback Operational Amplifier
Features
• Low Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5mA
The HFA1155 is a low power, high-speed op amp and is the
most recent addition to Intersil’s HFA1XX5 series of low
power op amps and buffers. Intersil's proprietary
complementary bipolar UHF-1 process, coupled with the
current feedback architecture deliver superb bandwidth even
at very high gains (>250MHz at AV = 10). The excellent
video parameters make this amplifier ideal for professional
video applications.
Though specified for ±5V operation, the HFA1155 operates
with single supply voltages as low as 4.5V, and requires only
1.4mA of ICC in 5V applications (see Application Information
section, and Application Note AN9897).
Ordering Information
PART NUMBER
(BRAND)
TEMP.
RANGE (°C)
HFA1155IH96
(1155)
-40 to 85
FN4863.1
• Low Distortion (10MHz, HD2) . . . . . . . . . . . . . . . . -53dBc
• -3dB Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 360MHz
• High Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . 1650V/μs
• Fast Settling Time (0.1%). . . . . . . . . . . . . . . . . . . . . 38ns
• Excellent Gain Flatness . . . . . . . . . . . ±0.06dB to 50MHz
• High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 55mA
• Fast Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . <7ns
• Operates with 5V Single Supply (See AN9897)
Applications
• Video Switching and Routing
PACKAGE
5 Ld SOT-23
Tape and Reel
PKG.
DWG. #
P5.064
• Pulse and Video Amplifiers
• IF Signal Processing
• Flash A/D Driver
• Medical Imaging Systems
• Related Literature
- AN9420, Current Feedback Theory
- AN9897, Single 5V Supply Operation
Pinout
HFA1155 (SOT23)
TOP VIEW
OUT 1
2
+
V-
5 V+
+IN 3
4 -IN
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2000, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
HFA1155
Absolute Maximum Ratings TA = 25oC
Thermal Information
Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Output Current (50% Duty Cycle) . . . . . . . . . . . . . . . . . . . . . . 60mA
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . . 600V
Thermal Resistance (Typical, Note 1)
θJA (oC/W)
SOT-23 Package . . . . . . . . . . . . . . . . . . . . . . . . . . .
225
Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
(Lead Tips Only)
Operating Conditions
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.
NOTE:
1. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
VSUPPLY = ±5V, AV = +1, RF = 510Ω , RL = 100Ω , Unless Otherwise Specified
PARAMETER
TEST CONDITIONS
(NOTE 2) TEMP.
TEST LEVEL (oC)
MIN
TYP
MAX
UNITS
-
2
6
mV
INPUT CHARACTERISTICS
Input Offset Voltage
A
A
Full
-
-
10
mV
Input Offset Voltage Drift
C
Full
-
10
-
μV/oC
A
25
40
46
-
dB
A
Full
38
-
-
dB
A
25
45
50
-
dB
A
Full
42
-
-
dB
A
25
-
25
40
μA
A
Full
-
-
65
μA
C
Full
-
40
-
nA/oC
A
25
-
20
40
μA/V
A
Full
-
-
50
μA/V
A
25
-
12
50
μA
A
Full
-
-
60
μA
C
Full
-
40
-
nA/oC
A
25
-
1
7
μA/V
A
Full
-
-
10
μA/V
A
25
-
6
15
μA/V
A
Full
-
-
27
μA/V
Non-Inverting Input Resistance
A
25
25
50
-
kΩ
Inverting Input Resistance
C
25
-
40
-
Ω
ΔVCM = ±2V
VIO CMRR
ΔVS = ±1.25V
VIO PSRR
Non-Inverting Input Bias Current
+IN = 0V
+IBIAS Drift
ΔVCM = ±2V
+IBIAS CMS
Inverting Input Bias Current
-IN = 0V
-IBIAS Drift
ΔVCM = ±2V
-IBIAS CMS
ΔVS = ±1.25V
-IBIAS PSS
25
Input Capacitance (Either Input)
B
25
-
2
-
pF
Input Common Mode Range
C
Full
±2.5
±3.0
-
V
nV/√Hz
Input Noise Voltage (Note 3)
100kHz
B
25
-
4.7
-
+Input Noise Current (Note 3)
100kHz
B
25
-
26
-
pA/√Hz
-Input Noise Current (Note 3)
100kHz
B
25
-
35
-
pA/√Hz
Open Loop Transimpedance Gain (Note 3)
B
25
-
630
-
kΩ
Minimum Stable Gain
A
Full
1
-
-
V/V
TRANSFER CHARACTERISTICS
2
HFA1155
Electrical Specifications
VSUPPLY = ±5V, AV = +1, RF = 510Ω , RL = 100Ω , Unless Otherwise Specified (Continued)
PARAMETER
AC CHARACTERISTICS
TEST CONDITIONS
(NOTE 2) TEMP.
TEST LEVEL (oC)
MIN
TYP
MAX
UNITS
AV = +2, (Note 4) Unless Otherwise Specified
AV = -1
B
25
-
360
-
MHz
AV = +1
B
25
-
365
-
MHz
AV = +2
B
25
-
355
-
MHz
-3dB Bandwidth (VOUT = 2VP-P)
AV = +2
B
25
-
170
-
MHz
Gain Flatness
(VOUT = 0.2VP-P, Note 3)
To 25MHz
B
25
-
±0.06
-
dB
-3dB Bandwidth
(VOUT = 0.2VP-P, Note 3)
Full Power Bandwidth
(VOUT = 5VP-P at AV = +2;
VOUT = 4VP-P at AV = +1, Note 3)
To 50MHz
B
25
-
±0.06
-
dB
To 100MHz
B
25
-
±0.1
-
dB
AV = +1
B
25
-
45
-
MHz
AV = +2
B
25
-
75
-
MHz
A
25
±3.0
±3.3
-
V
A
Full
±2.5
±3.0
-
V
A
25, 85
±40
±55
-
mA
AV = +2, (Note 4) Unless Otherwise Specified
OUTPUT CHARACTERISTICS
Output Voltage
AV = -1
Output Current
RL = 50Ω, AV = -1
DC Closed Loop Output Resistance (Note 3)
2nd Harmonic Distortion (Note 3)
3rd Harmonic Distortion (Note 3)
TRANSIENT CHARACTERISTICS
A
-40
±35
±50
-
mA
B
25
-
0.09
-
Ω
10MHz, VOUT = 2VP-P
B
25
-
-53
-
dBc
20MHz, VOUT = 2VP-P
B
25
-
-47
-
dBc
10MHz, VOUT = 2VP-P
B
25
-
-66
-
dBc
20MHz, VOUT = 2VP-P
B
25
-
-60
-
dBc
AV = +2, (Note 4) Unless Otherwise Specified
Rise and Fall Times
VOUT = 0.5VP-P
B
25
-
1.1
-
ns
Overshoot
VOUT = 0.5VP-P
B
25
-
11
-
%
Slew Rate
(VOUT = 5VP-P at AV = +2, -1;
VOUT = 4VP-P at AV = +1)
AV = -1
B
25
-
1650
-
V/μs
AV = +1
B
25
-
270
-
V/μs
AV = +2
B
25
-
510
-
V/μs
Settling Time (VOUT = 2V to 0V, Note 3)
To 0.1%
B
25
-
38
-
ns
To 0.05%
B
25
-
50
-
ns
To 0.01%
B
25
-
75
-
ns
VIN = ±2V
B
25
-
7
-
ns
25
-
0.02
-
%
Overdrive Recovery Time
VIDEO CHARACTERISTICS
AV = +2, (Note 4) Unless Otherwise Specified
Differential Gain
NTSC, RL = 150Ω
B
NTSC, RL = 75Ω
B
25
-
0.02
-
%
Differential Phase
NTSC, RL = 150Ω
B
25
-
0.06
-
Degrees
NTSC, RL = 75Ω
B
25
-
0.12
-
Degrees
Note 5
B
Full
±2.25
-
±5.5
V
A
Full
-
5.5
8
mA
POWER SUPPLY CHARACTERISTICS
Power Supply Range
Power Supply Current (Note 3)
NOTES:
2. Test Level: A. Production Tested; B. Typical or Guaranteed Limit Based on Characterization; C. Design Typical for Information Only.
3. See Typical Performance Curves for more information.
4. The feedback resistor value depends on closed loop gain. See the “Optimum Feedback Resistor” table in the Application Information section
for values used for characterization.
5. The minimum supply voltage entry is a typical value.
3
HFA1155
Application Information
Relevant Application Notes
The following Application Notes pertain to the HFA1155:
• AN9787-An Intuitive Approach to Understanding
Current Feedback Amplifiers
• AN9420-Current Feedback Amplifier Theory and
Applications
• AN9663-Converting from Voltage Feedback to Current
Feedback Amplifiers
• AN9897-Operating the HFA1155 from 5V Single
Supply
These publications may be obtained from Intersil’s web site
(www.intersil.com).
Performance Differences Between Packages
The HFA1155 is a high frequency current feedback
amplifier. As such, it is sensitive to parasitic capacitances
which influence the amplifier’s operation. The different
parasitic capacitances of different packages yield
performance differences (notably bandwidth and bandwidth
related parameters).
Because of these performance differences, designers
should evaluate and breadboard with the same package
style to be used in production.
Optimum Feedback Resistor
The enclosed frequency response graphs detail the
performance of the HFA1155 in various gains. Although the
bandwidth dependency on ACL isn’t as severe as that of a
voltage feedback amplifier, there is an appreciable decrease
in bandwidth at higher gains. This decrease can be minimized
by taking advantage of the current feedback amplifier’s unique
relationship between bandwidth and RF . All current feedback
amplifiers require a feedback resistor, even for unity gain
applications, and the RF , in conjunction with the internal
compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier’s bandwidth is
inversely proportional to RF . The HFA1155 is optimized for
RF = 604Ω, at a gain of +2. Decreasing RF decreases
stability, resulting in excessive peaking and overshoot (Note:
Capacitive feedback causes the same problems due to the
feedback impedance decrease at higher frequencies). At
higher gains the amplifier is more stable, so RF can be
decreased in a trade-off of stability for bandwidth. The table
below lists recommended RF values for various gains, and the
expected bandwidth.
4
OPTIMUM FEEDBACK RESISTOR
ACL
RF (Ω)
SOT-23
BANDWIDTH (MHz)
SOT-23
-1
576
360
+1
453, (+RS = 221)
365
+2
604
355
+5
475
300
+10
182
250
5V Single Supply Operation
This amplifier operates at single supply voltages down to
4.5V. The dramatic supply current reduction at this operating
condition (refer also to Figure 16) makes this op amp an
even better choice for low power 5V systems. Refer to
Application Note AN9897 for further information.
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 355MHz (AV = +2). By decreasing RS as CLincreases (as
illustrated by the curves), the maximum bandwidth is
obtained without sacrificing stability. In spite of this,
bandwidth still decreases as the load capacitance increases.
For example, at AV = +2, RS = 30Ω, CL = 22pF, the
bandwidth is 290MHz, but the bandwidth drops to 90MHz at
AV = +2, RS = 6Ω, CL = 390pF.
HFA1155
PC Board Layout
SERIES OUTPUT RESISTANCE (Ω)
50
AV = +2
40
30
Attention should be given to decoupling the power supplies.
A large value (10μF) tantalum in parallel with a small value
chip (0.1μF) capacitor works well in most cases.
20
10
0
0
50
100
150
200
250
300
350
400
LOAD CAPACITANCE (pF)
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
LOAD CAPACITANCE
Typical Performance Curves
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 in series with the
output.
Care must also be taken to minimize the capacitance to ground
seen by the amplifier’s inverting input. The larger this
capacitance, the worse the gain peaking, resulting in pulse
overshoot and eventual instability. To reduce this capacitance,
remove the ground plane under traces connected to -IN and
keep these traces as short as possible.
VSUPPLY = ±5V, RF = Value From the “Optimum Feedback Resistor” Table, TA = 25oC,
RL = 100Ω, Unless Otherwise Specified
2.0
AV = +1
150
1.5
100
1.0
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (mV)
200
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!
50
0
-50
-100
-150
AV = +1
0.5
0
-0.5
-1.0
-1.5
-200
-2.0
TIME (5ns/DIV.)
FIGURE 2. SMALL SIGNAL PULSE RESPONSE
5
TIME (5ns/DIV.)
FIGURE 3. LARGE SIGNAL PULSE RESPONSE
HFA1155
Typical Performance Curves
VSUPPLY = ±5V, RF = Value From the “Optimum Feedback Resistor” Table, TA = 25oC,
RL = 100Ω, Unless Otherwise Specified (Continued)
200
2.0
150
1.5
100
1.0
OUTPUT VOLTAGE (V)
50
0
-50
-100
-150
AV = +2
0.5
0
-0.5
-1.0
-1.5
-200
-2.0
TIME (5ns/DIV.)
TIME (5ns/DIV.)
FIGURE 5. LARGE SIGNAL PULSE RESPONSE
200
2.0
150
1.5
AV = +10
100
50
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (mV)
FIGURE 4. SMALL SIGNAL PULSE RESPONSE
AV = +5
0
AV = +10
-50
-100
-150
AV = +10
1.0
0.5
AV = +5
0
AV = +5
-0.5
-1.0
-1.5
-200
-2.0
TIME (5ns/DIV.)
TIME (5ns/DIV.)
VOUT = 200mVP-P , SOT-23
3
AV = +2
GAIN
0
-3
AV = +1
-6
PHASE
AV = +2
0
90
180
270
AV = +1
1
10
100
FREQUENCY (MHz)
FIGURE 8. FREQUENCY RESPONSE
6
360
1000
NORMALIZED GAIN (dB)
FIGURE 7. LARGE SIGNAL PULSE RESPONSE
PHASE (DEGREES)
NORMALIZED GAIN (dB)
FIGURE 6. SMALL SIGNAL PULSE RESPONSE
VOUT = 200mVP-P , SOT-23
3
AV = +5
GAIN
0
-3
AV = +10
-6
PHASE
AV = +5
0
90
180
AV = +10
1
10
100
FREQUENCY (MHz)
FIGURE 9. FREQUENCY RESPONSE
270
360
1000
PHASE (DEGREES)
OUTPUT VOLTAGE (mV)
AV = +2
HFA1155
Typical Performance Curves
VSUPPLY = ±5V, RF = Value From the “Optimum Feedback Resistor” Table, TA = 25oC,
RL = 100Ω, Unless Otherwise Specified (Continued)
VOUT = 5VP-P , AV = 2, SOT-23
VOUT = 200mVP-P , SOT-23
0.4
AV = +1
VOUT = 4VP-P , AV = 1
NORMALIZED GAIN (dB)
0.3
NORMALIZED GAIN (dB)
0.2
0.1
0
AV = +2
-0.1
AV = +1
-0.2
3
0
AV = +2
-3
-6
AV = +1
-9
-0.3
-0.4
1
10
FREQUENCY (MHz)
1
1000
100
10
100
FREQUENCY (MHz)
1000
FIGURE 11. FULL POWER BANDWIDTH
FIGURE 10. GAIN FLATNESS
630
1000
180
PHASE
135
90
0.63
45
0
0.01
0.1
1
10
FREQUENCY (MHz)
100
100
10
1
0.1
0.3
500
FIGURE 12. OPEN LOOP TRANSIMPEDANCE
NOISE VOLTAGE (nV/√Hz)
SETTLING ERROR (%)
SOT-23
0.05
0.025
0
-0.025
-0.05
-0.1
10
20
30
40
50
60
70
80
TIME (ns)
FIGURE 14. SETTLING RESPONSE
7
90
10
100
FREQUENCY (MHz)
1000
FIGURE 13. CLOSED LOOP OUTPUT RESISTANCE
AV = +2
VOUT = 2V
0.1
1
100
10
100
9
90
8
80
7
70
6
60
ENI
5
ENI
4
I NI -
3
I NI+
50
40
30
2
20
1
10
0
100
1K
10K
100K
FREQUENCY (Hz)
FIGURE 15. INPUT NOISE vs FREQUENCY
0
NOISE CURRENT (pA/√Hz)
6.3
OUTPUT RESISTANCE (Ω)
63
PHASE (DEGREES)
GAIN (kΩ)
GAIN
HFA1155
Typical Performance Curves
VSUPPLY = ±5V, RF = Value From the “Optimum Feedback Resistor” Table, TA = 25oC,
RL = 100Ω, Unless Otherwise Specified (Continued)
8
-25
-30
6
-35
DISTORTION (dBc)
5
4
3
2
1
0
50MHz
-40
20MHz
-45
-50
10MHz
-55
-60
4
5
6
7
8
9
10
11
-65
12
-6
-3
TOTAL SUPPLY VOLTAGE (V+ - V-, V)
FIGURE 16. SUPPLY CURRENT vs SUPPLY VOLTAGE
0
3
6
OUTPUT POWER (dBm)
-40
-50
50MHz
20MHz
-60
-70
10MHz
-80
-90
-6
-3
3
0
6
OUTPUT POWER (dBm)
9
FIGURE 18. 3rd HARMONIC DISTORTION vs POUT
8
9
FIGURE 17. 2nd HARMONIC DISTORTION vs POUT
-30
DISTORTION (dBc)
SUPPLY CURRENT (mA)
7
12
12
HFA1155
Die Characteristics
METALLIZATION:
PASSIVATION:
Type: Metal 1: AlCu (2%)/TiW
Thickness: Metal 1: 8kÅ ±0.4kÅ
Type: Metal 2: AlCu (2%)
Thickness: Metal 2: 16kÅ ±0.8kÅ
Type: Nitride
Thickness: 4kÅ ±0.5kÅ
TRANSISTOR COUNT:
40
SUBSTRATE POTENTIAL (POWERED UP):
Floating (Recommend Connection to V-)
Metallization Mask Layout
HFA1155
V+
OUT
V-
-IN
9
+IN
HFA1155
Small Outline Transistor Plastic Packages (SOT23-5)
P5.064
D
VIEW C
e1
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE
INCHES
5
SYMBOL
4
E
CL
1
2
CL
3
e
E1
b
CL
α
0.20 (0.008) M
C
C
CL
A
A2
SEATING
PLANE
A1
-C-
WITH
b
PLATING
b1
c
c1
MILLIMETERS
MAX
MIN
MAX
NOTES
A
0.036
0.057
0.90
1.45
-
A1
0.000
0.0059
0.00
0.15
-
A2
0.036
0.051
0.90
1.30
-
b
0.012
0.020
0.30
0.50
-
b1
0.012
0.018
0.30
0.45
c
0.003
0.009
0.08
0.22
6
c1
0.003
0.008
0.08
0.20
6
D
0.111
0.118
2.80
3.00
3
E
0.103
0.118
2.60
3.00
-
E1
0.060
0.067
1.50
1.70
3
e
0.0374 Ref
0.95 Ref
-
e1
0.0748 Ref
1.90 Ref
-
L
0.10 (0.004) C
MIN
0.014
0.022
0.35
0.55
L1
0.024 Ref.
0.60 Ref.
L2
0.010 Ref.
0.25 Ref.
N
5
5
4
5
R
0.004
-
0.10
-
R1
0.004
0.010
0.10
0.25
α
0o
8o
0o
8o
Rev. 2 9/03
NOTES:
BASE METAL
1. Dimensioning and tolerance per ASME Y14.5M-1994.
2. Package conforms to EIAJ SC-74 and JEDEC MO178AA.
4X θ1
3. Dimensions D and E1 are exclusive of mold flash, protrusions,
or gate burrs.
R1
4. Footlength L measured at reference to gauge plane.
5. “N” is the number of terminal positions.
R
GAUGE PLANE
SEATING
PLANE
L
C
L1
α
L2
6. These Dimensions apply to the flat section of the lead between
0.08mm and 0.15mm from the lead tip.
7. Controlling dimension: MILLIMETER. Converted inch dimensions are for reference only.
4X θ1
VIEW C
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software 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 www.intersil.com
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