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HFA1100
Data Sheet October 26, 2004 FN2945.9
850MHz, Low Distortion Current Feedback Operational Amplifiers
The HFA1100 is a high-speed, wideband, fast settling current feedback amplifier built with Intersil's proprietary complementary bipolar UHF-1 process. It operates with single supply voltages as low as 4.5V (see Application Information section). The HFA1100 is a basic op amp with uncommitted pins 1, 5, and 8. This device offers a significant performance improvement over the AD811, AD9617/18, the CLC400-409, and the EL2070, EL2073, EL2030.
Features
* Low Distortion (30MHz, HD2) . . . . . . . . . . . . . . . . -56dBc * -3dB Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 850MHz * Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . 2300V/s * Fast Settling Time (0.1%). . . . . . . . . . . . . . . . . . . . . 11ns * Excellent Gain Flatness - (100MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.14dB - (50MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.04dB * High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA * Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . . <10ns * Operates with 5V Single Supply (See AN9745) * Pb-Free Available (RoHS Compliant)
Ordering Information
PART NUMBER (BRAND) HFA1100IP HFA1100IB (H1100I) HFA1100IB96 (H1100I) HFA1100IBZ (Note) (H1100I) HFA1100IBZ96 (Note) (H1100I) HFA11XXEVAL TEMP. RANGE (C) -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC Tape and Reel PKG. DWG. # E8.3 M8.15 M8.15
Applications
* Video Switching and Routing * Pulse and Video Amplifiers * RF/IF Signal Processing * Flash A/D Driver * Medical Imaging Systems * Related Literature - AN9420, Current Feedback Theory - AN9202, HFA11XX Evaluation Fixture - AN9745, Single 5V Supply Operation
8 Ld SOIC (Pb-free) M8.15 8 Ld SOIC Tape and Reel (Pb-free) M8.15
DIP Evaluation Board for High-Speed Op Amps
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020C.
Pinout
HFA1100 (PDIP, SOIC) TOP VIEW
NC -IN 1 2 3 8 NC V+ OUT NC
+
7 6 5
The Op Amps with Fastest Edges
INPUT 220MHz SIGNAL
+IN
V- 4
OUTPUT (AV = 2) HFA1100 OP AMP 0ns 25ns
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2000, 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
HFA1100
Absolute Maximum Ratings TA = 25C
Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V Output Current (50% Duty Cycle) . . . . . . . . . . . . . . . . . . . . . . 60mA
Thermal Information
Thermal Resistance (Typical, Note 1) JA (C/W) JC (C/W) PDIP Package . . . . . . . . . . . . . . . . . . . 130 N/A SOIC Package . . . . . . . . . . . . . . . . . . . 170 N/A Maximum Junction Temperature (Plastic Package) . . . . . . . . 150C Maximum Storage Temperature Range . . . . . . . . . -65C to 150C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300C (SOIC - Lead Tips Only)
Operating Conditions
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . -40C to 85C
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
VSUPPLY = 5V, AV = +1, RF = 510 , RL = 100 , Unless Otherwise Specified TEST CONDITIONS (NOTE 2) TEST LEVEL TEMP. (C)
PARAMETER INPUT CHARACTERISTICS Input Offset Voltage (Note 3)
MIN
TYP
MAX
UNITS
A 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
40 38 45 42 25 2.5 -
2 10 46 50 25 40 20 12 40 1 6 50 20 2 3.0 4 18 21
6 10 40 65 40 50 50 60 7 10 15 27 30 -
mV mV V/C dB dB dB dB A A nA/C A/V A/V A A nA/C A/V A/V A/V A/V k pF V nV/Hz pA/Hz pA/Hz
Input Offset Voltage Drift VIO CMRR VCM = 2V
C A A
VIO PSRR
VS = 1.25V
A A
Non-Inverting Input Bias Current (Note 3) +IBIAS Drift +IBIAS CMS
+IN = 0V
A A C
VCM = 2V
A A
Inverting Input Bias Current (Note 3)
-IN = 0V
A A
-IBIAS Drift -IBIAS CMS VCM = 2V
C A A
-IBIAS PSS
VS = 1.25V
A A
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 100kHz 100kHz 100kHz
A C B C B B B
AV = +2, Unless Otherwise Specified B 25 300 k
Open Loop Transimpedance (Note 3)
2
FN2945.9
HFA1100
Electrical Specifications
VSUPPLY = 5V, AV = +1, RF = 510 , RL = 100 , Unless Otherwise Specified (Continued) TEST CONDITIONS VOUT = 0.2VP-P, AV = +1 VOUT = 0.2VP-P, AV = +2, RF = 360 VOUT = 4VP-P, AV = -1 To 100MHz To 50MHz To 30MHz DC to 100MHz NTSC, RL = 75 NTSC, RL = 75 (NOTE 2) TEST LEVEL B B B B B B B B B A AV = +2, Unless Otherwise Specified AV = -1 A A Output Current RL = 50, AV = -1 A A DC Closed Loop Output Impedance (Note 3) 2nd Harmonic Distortion (Note 3) 3rd Harmonic Distortion (Note 3) 3rd Order Intercept (Note 3) 1dB Compression 30MHz, VOUT = 2VP-P 30MHz, VOUT = 2VP-P 100MHz 100MHz B B B B B 25 Full 25, 85 -40 25 25 25 25 25 3.0 2.5 50 35 20 15 3.3 3.0 60 50 0.07 -56 -80 30 20 V V mA mA dBc dBc dBm dBm TEMP. (C) 25 25 25 25 25 25 25 25 25 Full
PARAMETER -3dB Bandwidth (Note 3) -3dB Bandwidth Full Power Bandwidth Gain Flatness (Note 3) Gain Flatness Gain Flatness Linear Phase Deviation (Note 3) Differential Gain Differential Phase Minimum Stable Gain OUTPUT CHARACTERISTICS Output Voltage (Note 3)
MIN 530 1
TYP 850 670 300 0.14 0.04 0.01 0.6 0.03 0.05 -
MAX -
UNITS MHz MHz MHz dB dB dB Degrees % Degrees V/V
TRANSIENT RESPONSE AV = +2, Unless Otherwise Specified Rise Time Overshoot (Note 3) Slew Rate Slew Rate 0.1% Settling (Note 3) 0.2% Settling (Note 3) Overdrive Recovery Time POWER SUPPLY CHARACTERISTICS Supply Voltage Range Supply Current (Note 3) B A A 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. Full 25 Full 4.5 21 5.5 26 33 V mA mA VOUT = 2.0V Step VOUT = 2.0V Step AV = +1, VOUT = 5VP-P AV = +2, VOUT = 5VP-P VOUT = 2V to 0V VOUT = 2V to 0V 2X Overdrive B B B B B B B 25 25 25 25 25 25 25 1850 900 10 1400 2300 11 7 7.5 10 ps % V/s V/s ns ns ns
3
FN2945.9
HFA1100 Application Information
Optimum Feedback Resistor (RF)
The enclosed plots of inverting and non-inverting frequency response detail the performance of the HFA1100 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 HFA1100 design is optimized for a 510 RF , at a gain of +1. Decreasing RF in a unity gain application 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.
ACL +1 -1 +2 +5 +10 +19 RF () 510 430 360 150 180 270 BW (MHz) 850 580 670 520 240 125
Use of Die in Hybrid Applications
This amplifier is designed with compensation to negate the package parasitics that typically lead to instabilities. As a result, the use of die in hybrid applications results in overcompensated performance due to lower parasitic capacitances. Reducing RF below the recommended values for packaged units will solve the problem. For AV = +2 the recommended starting point is 300, while unity gain applications should try 400.
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 (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 possible instability. To this end, it is recommended that the ground plane be removed under traces connected to pin 2, and connections to pin 2 should be kept as short as possible. An example of a good high frequency layout is the Evaluation Board shown below.
5V Single Supply Operation
This amplifier operates at single supply voltages down to 4.5V. The table below details the amplifier's performance with a single 5V supply. The dramatic supply current reduction at this operating condition (refer also to Figure 23) makes these op amps even better choices for low power 5V systems. Refer to Application Note AN9745 for further information.
PARAMETER Input Common Mode Range -3dB BW (AV = +2) Gain Flatness (to 50MHz, AV = +2) Output Voltage (AV = -1) Slew Rate (AV = +2) 0.1% Settling Time Supply Current TYP 1V to 4V 267MHz 0.05dB 1.3V to 3.8V 475V/s 17ns 5.5mA
Evaluation Board
An evaluation board is available for the HFA1100 (Part Number HFA11XXEVAL). Please contact your local sales office for information.
4
FN2945.9
HFA1100
The layout and schematic of the board are shown below:
500 500 VH
1 50 IN 2 3 4 10F 0.1F -5V
8 7
0.1F 50
10F +5V OUT VL
6 5 GND GND
TOP LAYOUT
VH 1 +IN VL
BOTTOM LAYOUT
OUT
V-
V+
GND
Typical Performance Curves
120 OUTPUT VOLTAGE (mV) 90 60 30 0 -30 -60 -90 -120 TIME (5ns/DIV.) AV = +2
VSUPPLY = 5V, RF = 510 , TA = 25C, RL = 100, Unless Otherwise Specified
AV = +2
1.2 0.9 OUTPUT VOLTAGE (V) 0.6 0.3 0 -0.3 -0.6 -0.9 -1.2
TIME (5ns/DIV.)
FIGURE 1. SMALL SIGNAL PULSE
NORMALIZED GAIN (dB) NORMALIZED GAIN (dB)
FIGURE 2. LARGE SIGNAL PULSE
VOUT = 200mVP-P GAIN -3 -6 -9 -12 PHASE AV = -1 AV = -5 AV = -10 AV = -20 0.3 1 10 100 FREQUENCY (MHz) 180 90 0 -90 -180 1K PHASE (DEGREES) AV = -1 AV = -5 AV = -10 AV = -20
0 -3 -6 -9 -12
VOUT = 200mVP-P GAIN AV = +1 AV = +2 AV = +6 AV = +11 0 AV = +1 AV = +2 AV = +6 AV = +11 0.3 1 10 100 FREQUENCY (MHz) -90 -180 -270 -360 1K PHASE (DEGREES) PHASE
0
FIGURE 3. NON-INVERTING FREQUENCY RESPONSE
FIGURE 4. INVERTING FREQUENCY RESPONSE
5
FN2945.9
HFA1100 Typical Performance Curves
6 GAIN (dB) 3 0 -3 -6 PHASE GAIN RL = 100 RL = 50 PHASE (DEGREES) RL = 50 RL = 100 RL = 1k RL = 100 RL = 1k 0.3 1 10 100 FREQUENCY (MHz) 1K AV = +1, VOUT = 200mVP-P RL = 1k
VSUPPLY = 5V, RF = 510 , TA = 25C, RL = 100, Unless Otherwise Specified (Continued)
NORMALIZED GAIN (dB)
AV = +2, VOUT = 200mVP-P 3 0 -3 -6 PHASE RL = 50 RL = 100 RL = 100 RL = 50 0 -90 RL = 1k RL = 100 RL = 1k 0.3 1 10 100 FREQUENCY (MHz) 1K -180 -270 -360 PHASE (DEGREES) GAIN RL = 1k
0 -90 -180 -270 -360
FIGURE 5. FREQUENCY RESPONSE FOR VARIOUS LOAD RESISTORS
FIGURE 6. FREQUENCY RESPONSE FOR VARIOUS LOAD RESISTORS
20 10 GAIN (dB) 0 -10 -20 -30
NORMALIZED GAIN (dB)
AV = +1
20 10 0 -10 -20 -30
AV = +2
0.160VP-P 0.500VP-P 0.920VP-P 1.63VP-P
0.32VP-P 1.00VP-P 1.84VP-P 3.26VP-P
0.3
1
10 100 FREQUENCY (MHz)
1K
0.3
1
10 100 FREQUENCY (MHz)
1K
FIGURE 7. FREQUENCY RESPONSE FOR VARIOUS OUTPUT VOLTAGES
FIGURE 8. FREQUENCY RESPONSE FOR VARIOUS OUTPUT VOLTAGES
NORMALIZED GAIN (dB)
20 10 0 -10 -20 -30
AV = +6 950 BANDWIDTH (MHz) 900 850 800 750 700
AV = +1
0.96VP-P TO 3.89VP-P
0.3
1
10 100 FREQUENCY (MHz)
1K
-50
-25
0
25
50
75
100
125
TEMPERATURE (oC)
FIGURE 9. FREQUENCY RESPONSE FOR VARIOUS OUTPUT VOLTAGES
FIGURE 10. -3dB BANDWIDTH vs TEMPERATURE
6
FN2945.9
HFA1100 Typical Performance Curves
VSUPPLY = 5V, RF = 510 , TA = 25C, RL = 100, Unless Otherwise Specified (Continued)
AV = +2
250
AV = -1
GAIN (k)
25
GAIN GAIN (dB)
0 -0.05 -0.10 -0.15 -0.20
2.5 PHASE 0.25
180 135 90 45 0
0.01
0.1
1 10 FREQUENCY (MHz)
100
500
PHASE (DEGREES)
1
10 FREQUENCY (MHz)
100
FIGURE 11. OPEN LOOP TRANSIMPEDANCE
FIGURE 12. GAIN FLATNESS
2.0 DEVIATION (DEGREES) 1.5
AV = +2 0.6 SETTLING ERROR (%) 0.4 0.2 0 -0.2 -0.4 -0.6
AV = +2, VOUT = 2V
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 0 15 30 45 60 75 90 105 120 FREQUENCY (MHz) 135 150
-4
1
6
11
16
21 26 TIME (ns)
31
36
41
46
FIGURE 13. DEVIATION FROM LINEAR PHASE
FIGURE 14. SETTLING RESPONSE
40 2-TONE 1000 INTERCEPT POINT (dBm) OUTPUT RESISTANCE () 35 30 25 20 15 10 5 0.1 0.3 1 10 100 FREQUENCY (MHz) 1000 0 0 100 200 300 FREQUENCY (MHz) 400
100
10
1
FIGURE 15. CLOSED LOOP OUTPUT RESISTANCE
FIGURE 16. 3rd ORDER INTERMODULATION INTERCEPT
7
FN2945.9
HFA1100 Typical Performance Curves
-30 -35 DISTORTION (dBc) DISTORTION (dBc) -40 100MHz -45 -50 -55 -60 -65 -70 -5 -3 -1 1 3 5 7 9 OUTPUT POWER (dBm) 11 13 15 30MHz 50MHz
VSUPPLY = 5V, RF = 510 , TA = 25C, RL = 100, Unless Otherwise Specified (Continued)
-30 -40 -50 100MHz -60 -70 -80 -90 -100 -110 -5 -3 -1 1 3 5 7 9 11 13 15 OUTPUT POWER (dBm) 30MHz 50MHz
FIGURE 17. 2nd HARMONIC DISTORTION vs POUT
FIGURE 18. 3rd HARMONIC DISTORTION vs POUT
38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6
35 AV = +1 30 VOUT = 1VP-P OVERSHOOT (%) 25 RF = 360 20 VOUT = 0.5VP-P 15 10 5 0 100 200 300 400 500 600 700 800 900 1000 100 200 300
RF = 360 VOUT = 2VP-P
AV = +2
OVERSHOOT (%)
RF = 360 VOUT = 1VP-P
VOUT = 0.5VP-P
VOUT = 2VP-P
RF = 510 VOUT = 2VP-P RF = 510 VOUT = 1VP-P RF = 510 VOUT = 0.5VP-P 400 500 600 700 800 900 1000
INPUT RISE TIME (ps)
INPUT RISE TIME (ps)
FIGURE 19. OVERSHOOT vs INPUT RISE TIME
FIGURE 20. OVERSHOOT vs INPUT RISE TIME
36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 360 400
25 AV = +2, tR = 200ps, VOUT = 2VP-P 24 SUPPLY CURRENT (mA) 23 22 21 20 19 18 440 480 560 600 520 FEEDBACK RESISTOR () 640 680 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (oC)
OVERSHOOT (%)
FIGURE 21. OVERSHOOT vs FEEDBACK RESISTOR
FIGURE 22. SUPPLY CURRENT vs TEMPERATURE
8
FN2945.9
HFA1100 Typical Performance Curves
22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 5 6 7 8 9 10 TOTAL SUPPLY VOLTAGE (V+ - V-, V)
VSUPPLY = 5V, RF = 510 , TA = 25C, RL = 100, Unless Otherwise Specified (Continued)
2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 -60 -40 -20 0 20 45 42 39 36 33 30 27 24 21 18 15 12 9 6 3 0
INPUT OFFSET VOLTAGE (mV)
SUPPLY CURRENT (mA)
+IBIAS
VIO
-IBIAS
40
60
80
100 120
TEMPERATURE (oC)
FIGURE 23. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 24. VIO AND BIAS CURRENTS vs TEMPERATURE
3.7 3.6 OUTPUT VOLTAGE (V) 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (oC) 0 100 1K 10K FREQUENCY (Hz) | - VOUT | +VOUT AV = -1, RL = 50 VOLTAGE NOISE (nV/Hz) 30 25 20 15 10 5 300 275 250 225 200 175 150 125 100 75 ENI eni IiniNI Iini+ NI+ 100K 50 25 0 CURRENT NOISE (pA/Hz)
FIGURE 25. OUTPUT VOLTAGE vs TEMPERATURE
FIGURE 26. INPUT NOISE vs FREQUENCY
9
FN2945.9
BIAS CURRENTS (A)
HFA1100 Die Characteristics
DIE DIMENSIONS: 63 mils x 44 mils x 19 mils 1600m x 1130m 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: 52 SUBSTRATE POTENTIAL (POWERED UP): Floating (Recommend Connection to V-)
Metallization Mask Layout
HFA1100
+IN
-IN
V-
BAL VL
BAL
VH
V+
OUT
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
FN2945.9

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