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HFA1100, HFA1120
Data Sheet May 1999 File Number
2945.7
850MHz, Low Distortion Current Feedback Operational Amplifiers
The HFA1100, 1120 are a family of high-speed, wideband, fast settling current feedback amplifiers built with Intersil's proprietary complementary bipolar UHF-1 process. Both amplifiers operate 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. The HFA1120 includes inverting input bias current adjust pins (pins 1 and 5) for adjusting the output offset voltage. These devices offer a significant performance improvement over the AD811, AD9617/18, the CLC400-409, and the EL2070, EL2073, EL2030. For Military grade product refer to the HFA1100/883, HFA1120/883 data sheet.
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)
Applications
* Video Switching and Routing * Pulse and Video Amplifiers * RF/IF Signal Processing
Ordering Information
PART NUMBER (BRAND) HFA1100IP HFA1100IB (H1100I) HFA1120IB (H1120I) HFA11XXEVAL TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 PACKAGE 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC PKG. NO. E8.3 M8.15 M8.15
* Flash A/D Driver * Medical Imaging Systems * Related Literature - AN9420, Current Feedback Theory - AN9202, HFA11XX Evaluation Fixture - AN9745, Single 5V Supply Operation
DIP Evaluation Board for High-Speed Op Amps
Pinouts The Op Amps with Fastest Edges
INPUT 220MHz SIGNAL
HFA1100 (PDIP, SOIC) TOP VIEW
NC -IN +IN OUTPUT (AV = 2) HFA1130 OP AMP V1 2 3 4 8 NC V+ OUT NC
+
7 6 5
0ns
25ns
HFA1120 (SOIC) TOP VIEW
BAL -IN +IN
1 2 3
8 NC
+
7 V+ 6 OUT 5 BAL
V- 4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright (c) Intersil Corporation 1999
HFA1100, HFA1120
Absolute Maximum Ratings
TA = 25oC
Thermal Information
Thermal Resistance (Typical, Note 1) JA (oC/W) JC (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . 130 N/A SOIC Package . . . . . . . . . . . . . . . . . . . 170 N/A Maximum Junction Temperature (Plastic Package) . . . . . . . . .150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only)
Voltage Between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V Output Current (50% Duty Cycle) . . . . . . . . . . . . . . . . . . . . . . 60mA
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 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. (oC)
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 25 Full 25 25 25
40 38 45 42 100 25 2.5 -
2 10 46 50 25 40 20 12 40 1 6 200 50 20 2 3.0 4 18 21
6 10 40 65 40 50 50 60 7 10 15 27 30 -
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 A k pF V nV/Hz pA/Hz pA/Hz
Input Offset Voltage Drift VIO CMRR VCM = 2V VS = 1.25V
C A A
VIO PSRR
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 VS = 1.25V
C A A
-IBIAS PSS
A A
-IBIAS Adj. Range (HFA1120) 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) 100kHz 100kHz 100kHz
A A C B C B B B
2
HFA1100, HFA1120
Electrical Specifications
VSUPPLY = 5V, AV = +1, RF = 510, RL = 100, Unless Otherwise Specified (Continued) TEST CONDITIONS (NOTE 2) TEST LEVEL TEMP. (oC)
PARAMETER TRANSFER CHARACTERISTICS
MIN
TYP
MAX
UNITS
AV = +2, Unless Otherwise Specified B 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 B B B B B B B B B A 25 25 25 25 25 25 25 25 25 25 Full 530 1 300 850 670 300 0.14 0.04 0.01 0.6 0.03 0.05 k MHz MHz MHz dB dB dB Degrees % Degrees V/V
Open Loop Transimpedance (Note 3) -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 AV = +2, Unless Otherwise Specified Output Voltage (Note 3) AV = -1
A A
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
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 TRANSIENT RESPONSE 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) 30MHz, VOUT = 2VP-P 30MHz, VOUT = 2VP-P 100MHz 100MHz AV = +2, Unless Otherwise Specified 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 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
B A A
Full 25 Full
4.5 -
21 -
5.5 26 33
V mA mA
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.
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HFA1100, HFA1120 Application Information
Optimum Feedback Resistor (RF)
The enclosed plots of inverting and non-inverting frequency response detail the performance of the HFA1100/1120 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, 1120 designs are 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 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
Use of Die in Hybrid Applications
These amplifiers are 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 these amplifiers 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.
Offset Adjustment
The HFA1120 allows for adjustment of the inverting input bias current to null the output offset voltage. -IBIAS flows through RF, so any change in bias current forces a corresponding change in output voltage. The amount of adjustment is a function of RF. With RF = 510, the typical adjust range is 100mV. For offset adjustment connect a 10k potentiometer between pins 1 and 5 with the wiper connected to V-.
5V Single Supply Operation
These amplifiers will operate 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.
Evaluation Board
An evaluation board is available for the HFA1100 (Part Number HFA11XXEVAL). Please contact your local sales office for information.
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HFA1100, HFA1120
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 = 25oC, 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
HFA1100, HFA1120 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 = 25oC, 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
HFA1100, HFA1120 Typical Performance Curves
250
VSUPPLY = 5V, RF = 510, TA = 25oC, RL = 100, Unless Otherwise Specified (Continued)
AV = -1 AV = +2
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 1000 OUTPUT RESISTANCE () INTERCEPT POINT (dBm) 2-TONE 35 30 25 20 15 10 5 0 0.3 1 10 100 FREQUENCY (MHz) 1000 0 100 200 300 FREQUENCY (MHz) 400
100
10
1
0.1
FIGURE 15. CLOSED LOOP OUTPUT RESISTANCE
FIGURE 16. 3rd ORDER INTERMODULATION INTERCEPT
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HFA1100, HFA1120 Typical Performance Curves
-30 -35 DISTORTION (dBc) DISTORTION (dBc) -40 -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 = 25oC, 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
100MHz
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
HFA1100, HFA1120 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 = 25oC, 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 ENI eni IiniNI Iini+ NI+ 100K 300 275 250 225 200 175 150 125 100 75 50 25 0 CURRENT NOISE (pA/Hz)
FIGURE 25. OUTPUT VOLTAGE vs TEMPERATURE
FIGURE 26. INPUT NOISE vs FREQUENCY
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BIAS CURRENTS (A)
HFA1100, HFA1120 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, HFA1120
+IN
-IN
V-
BAL VL
BAL
VH
V+
OUT
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Intersil semiconductor 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 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 http://www.intersil.com
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