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HFA1155
Data Sheet September 2004 FN4863.1
380MHz, SOT-23, Low Power Current Feedback Operational Amplifier
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).
Features
* Low Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5mA * Low Distortion (10MHz, HD2) . . . . . . . . . . . . . . . . -53dBc * -3dB Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 360MHz * High Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . 1650V/s * 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 * 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
Ordering Information
PART NUMBER (BRAND) HFA1155IH96 (1155) TEMP. RANGE (C) -40 to 85 PACKAGE 5 Ld SOT-23 Tape and Reel PKG. DWG. # P5.064
Pinout
HFA1155 (SOT23) TOP VIEW
OUT 1 V2 +
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
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 Information
Thermal Resistance (Typical, Note 1) JA (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. JA 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
PARAMETER INPUT CHARACTERISTICS Input Offset Voltage Input Offset Voltage Drift VIO CMRR VIO PSRR Non-Inverting Input Bias Current +IBIAS Drift +IBIAS CMS Inverting Input Bias Current -IBIAS Drift -IBIAS CMS -IBIAS PSS Non-Inverting Input Resistance Inverting Input Resistance Input Capacitance (Either Input) Input Common Mode Range Input Noise Voltage (Note 3) +Input Noise Current (Note 3) -Input Noise Current (Note 3) TRANSFER CHARACTERISTICS
VSUPPLY = 5V, AV = +1, RF = 510 , RL = 100 , Unless Otherwise Specified TEST CONDITIONS (NOTE 2) TEMP. TEST LEVEL (oC) A A C VCM = 2V VS = 1.25V +IN = 0V A A A A A A C VCM = 2V -IN = 0V A A A A C VCM = 2V VS = 1.25V A A A A A C B C 100kHz 100kHz 100kHz B B B B A 25 Full Full 25 Full 25 Full 25 Full Full 25 Full 25 Full Full 25 Full 25 Full 25 25 25 Full 25 25 25 25 Full MIN 40 38 45 42 25 2.5 1 TYP 2 10 46 50 25 40 20 12 40 1 6 50 40 2 3.0 4.7 26 35 630 MAX 6 10 40 65 40 50 50 60 7 10 15 27 UNITS mV mV V/oC dB dB dB dB A A nA/oC A/V A/V A A nA/oC A/V A/V A/V A/V k pF V nV/Hz pA/Hz pA/Hz k V/V
Open Loop Transimpedance Gain (Note 3) Minimum Stable Gain
2
HFA1155
Electrical Specifications
PARAMETER AC CHARACTERISTICS -3dB Bandwidth (VOUT = 0.2VP-P, Note 3) AV = -1 AV = +1 AV = +2 -3dB Bandwidth (VOUT = 2VP-P) Gain Flatness (VOUT = 0.2VP-P, Note 3) AV = +2 To 25MHz To 50MHz To 100MHz Full Power Bandwidth (VOUT = 5VP-P at AV = +2; VOUT = 4VP-P at AV = +1, Note 3) OUTPUT CHARACTERISTICS Output Voltage Output Current DC Closed Loop Output Resistance (Note 3) 2nd Harmonic Distortion (Note 3) 3rd Harmonic Distortion (Note 3) TRANSIENT CHARACTERISTICS Rise and Fall Times Overshoot Slew Rate (VOUT = 5VP-P at AV = +2, -1; VOUT = 4VP-P at AV = +1) Settling Time (VOUT = 2V to 0V, Note 3) 10MHz, VOUT = 2VP-P 20MHz, VOUT = 2VP-P 10MHz, VOUT = 2VP-P 20MHz, VOUT = 2VP-P AV = +2, (Note 4) Unless Otherwise Specified VOUT = 0.5VP-P VOUT = 0.5VP-P AV = -1 AV = +1 AV = +2 To 0.1% To 0.05% To 0.01% Overdrive Recovery Time VIDEO CHARACTERISTICS Differential Gain Differential Phase 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. Note 5 B A Full Full 2.25 5.5 5.5 8 V mA VIN = 2V AV = +2, (Note 4) Unless Otherwise Specified NTSC, RL = 150 NTSC, RL = 75 NTSC, RL = 150 NTSC, RL = 75 B B B B 25 25 25 25 0.02 0.02 0.06 0.12 % % Degrees Degrees B B B B B B B B B 25 25 25 25 25 25 25 25 25 1.1 11 1650 270 510 38 50 75 7 ns % V/s V/s V/s ns ns ns ns AV = +1 AV = +2 VSUPPLY = 5V, AV = +1, RF = 510 , RL = 100 , Unless Otherwise Specified (Continued) TEST CONDITIONS (NOTE 2) TEMP. TEST LEVEL (oC) B B B B B B B B B 25 25 25 25 25 25 25 25 25 MIN TYP 360 365 355 170 0.06 0.06 0.1 45 75 MAX UNITS MHz MHz MHz MHz dB dB dB MHz MHz
AV = +2, (Note 4) Unless Otherwise Specified
AV = +2, (Note 4) Unless Otherwise Specified AV = -1 RL = 50, AV = -1 A A A A B B B B B 25 Full 25, 85 -40 25 25 25 25 25 3.0 2.5 40 35 3.3 3.0 55 50 0.09 -53 -47 -66 -60 V V mA mA dBc dBc dBc dBc
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).
ACL -1 +1 +2 +5 +10 OPTIMUM FEEDBACK RESISTOR RF () SOT-23 576 453, (+RS = 221) 604 475 182 BANDWIDTH (MHz) SOT-23 360 365 355 300 250
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.
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.
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 = 30, CL = 22pF, the bandwidth is 290MHz, but the bandwidth drops to 90MHz at AV = +2, RS = 6, CL = 390pF.
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 = 604, 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
HFA1155
50 SERIES OUTPUT RESISTANCE ()
PC Board Layout
AV = +2
40
30
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! Attention should be given to decoupling the power supplies. A large value (10F) tantalum in parallel with a small value chip (0.1F) 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 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.
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
200 150 OUTPUT VOLTAGE (mV) 100 50 0 -50 -100 -150 -200 TIME (5ns/DIV.)
VSUPPLY = 5V, RF = Value From the "Optimum Feedback Resistor" Table, TA = 25oC, RL = 100, Unless Otherwise Specified
2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 TIME (5ns/DIV.)
AV = +1
AV = +1
FIGURE 2. SMALL SIGNAL PULSE RESPONSE
OUTPUT VOLTAGE (V)
FIGURE 3. LARGE SIGNAL PULSE RESPONSE
5
HFA1155 Typical Performance Curves
200 AV = +2 150 OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (V) 100 50 0 -50 -100 -150 -200 TIME (5ns/DIV.)
VSUPPLY = 5V, RF = Value From the "Optimum Feedback Resistor" Table, TA = 25oC, RL = 100, Unless Otherwise Specified (Continued)
2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 TIME (5ns/DIV.)
AV = +2
FIGURE 4. SMALL SIGNAL PULSE RESPONSE
FIGURE 5. LARGE SIGNAL PULSE RESPONSE
200 150 OUTPUT VOLTAGE (mV) 100 50 0 -50 -100 -150 -200 TIME (5ns/DIV.) AV = +10 AV = +5 AV = +10 OUTPUT VOLTAGE (V)
2.0 1.5 1.0 0.5 AV = +5 0 -0.5 -1.0 -1.5 -2.0 TIME (5ns/DIV.) AV = +5 AV = +10
FIGURE 6. SMALL SIGNAL PULSE RESPONSE
FIGURE 7. LARGE SIGNAL PULSE RESPONSE
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
3 0 -3 -6
VOUT = 200mVP-P , SOT-23 GAIN AV = +2
3 0 -3 -6
VOUT = 200mVP-P , SOT-23 GAIN
AV = +5
AV = +1 PHASE PHASE (DEGREES) AV = +2 0 90 180 270 AV = +1 1 10 100 FREQUENCY (MHz) 360 1000
AV = +10 PHASE AV = +5 0 PHASE (DEGREES) 90 180 AV = +10 270 360 1000
1
10 100 FREQUENCY (MHz)
FIGURE 8. FREQUENCY RESPONSE
FIGURE 9. FREQUENCY RESPONSE
6
HFA1155 Typical Performance Curves
VOUT = 200mVP-P , SOT-23 AV = +1
VSUPPLY = 5V, RF = Value From the "Optimum Feedback Resistor" Table, TA = 25oC, RL = 100, Unless Otherwise Specified (Continued)
VOUT = 5VP-P , AV = 2, SOT-23 VOUT = 4VP-P , AV = 1
0.4 0.3 NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 1 10 FREQUENCY (MHz) 100 1000 AV = +1 AV = +2
3 0 -3 -6 -9 AV = +1 AV = +2
1
10 100 FREQUENCY (MHz)
1000
FIGURE 10. GAIN FLATNESS
FIGURE 11. FULL POWER BANDWIDTH
630 GAIN GAIN (k) 63
1000 OUTPUT RESISTANCE ()
100
PHASE 0.63
135 90 45 0
PHASE (DEGREES)
6.3
180
10
1
0.1 0.3 1 10 100 FREQUENCY (MHz) 1000
0.01
0.1
1 10 FREQUENCY (MHz)
100
500
FIGURE 12. OPEN LOOP TRANSIMPEDANCE
10 AV = +2 VOUT = 2V NOISE VOLTAGE (nV/Hz) SOT-23 9 8 7 6 5 4 3 2 -0.1 1
FIGURE 13. CLOSED LOOP OUTPUT RESISTANCE
100 90 80 70 ENI ENI I NI I NI+ 60 50 40 30 20 10 1K 10K FREQUENCY (Hz) 100K 0 NOISE CURRENT (pA/Hz)
0.1 SETTLING ERROR (%)
0.05 0.025 0 -0.025 -0.05
10
20
30
40
50
60
70
80
90
100
0 100
TIME (ns)
FIGURE 14. SETTLING RESPONSE
FIGURE 15. INPUT NOISE vs FREQUENCY
7
HFA1155 Typical Performance Curves
8 7 SUPPLY CURRENT (mA) 6 DISTORTION (dBc) 5 4 3 2 1 0 -25 -30 -35 -40 -45 -50 -55 -60 4 5 6 7 8 9 10 11 12 -65 -6 -3 0 3 6 OUTPUT POWER (dBm) 9 12 10MHz 20MHz 50MHz
VSUPPLY = 5V, RF = Value From the "Optimum Feedback Resistor" Table, TA = 25oC, RL = 100, Unless Otherwise Specified (Continued)
TOTAL SUPPLY VOLTAGE (V+ - V-, V)
FIGURE 16. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 17. 2nd HARMONIC DISTORTION vs POUT
-30 -40 DISTORTION (dBc) -50 50MHz -60 -70 10MHz -80 -90 -6 -3 3 0 6 OUTPUT POWER (dBm) 9 12 20MHz
FIGURE 18. 3rd HARMONIC DISTORTION vs POUT
8
HFA1155 Die Characteristics
METALLIZATION: Type: Metal 1: AlCu (2%)/TiW Thickness: Metal 1: 8kA 0.4kA Type: Metal 2: AlCu (2%) Thickness: Metal 2: 16kA 0.8kA PASSIVATION: Type: Nitride Thickness: 4kA 0.5kA TRANSISTOR COUNT: 40 SUBSTRATE POTENTIAL (POWERED UP): Floating (Recommend Connection to V-)
Metallization Mask Layout
HFA1155
V+
OUT
V-
-IN
+IN
9
HFA1155 Small Outline Transistor Plastic Packages (SOT23-5)
D
P5.064
VIEW C
e1
5 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE INCHES MILLIMETERS MIN 0.90 0.00 0.90 0.30 0.30 0.08 0.08 2.80 2.60 1.50 MAX 1.45 0.15 1.30 0.50 0.45 0.22 0.20 3.00 3.00 1.70 6 6 3 3 4 NOTES SYMBOL A MIN 0.036 0.000 0.036 0.012 0.012 0.003 0.003 0.111 0.103 0.060 MAX 0.057 0.0059 0.051 0.020 0.018 0.009 0.008 0.118 0.118 0.067
5 E 1 2 3
4 C L C L E1
A1 A2 b b1
e
C L 0.20 (0.008) M C L C
b
C
c c1 D E E1
A
A2
A1
SEATING PLANE -C-
e e1 L L1
0.0374 Ref 0.0748 Ref 0.014 0.022 0.024 Ref. 0.010 Ref. 5 0.004 0.004 0o 0.010 8o
0.95 Ref 1.90 Ref 0.35 0.55 0.60 Ref. 0.25 Ref. 5 0.10 0.10 0o 0.25 8o
0.10 (0.004) C
L2 N R R1
5
WITH PLATING c
b b1 c1
NOTES:
Rev. 2 9/03
BASE METAL
1. Dimensioning and tolerance per ASME Y14.5M-1994. 2. Package conforms to EIAJ SC-74 and JEDEC MO178AA. 3. Dimensions D and E1 are exclusive of mold flash, protrusions, or gate burrs.
4X 1 R1 R GAUGE PLANE SEATING PLANE L C 4X 1 VIEW C L1
4. Footlength L measured at reference to gauge plane. 5. "N" is the number of terminal positions. 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.
L2
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 10

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