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(R)
September 1998
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HFA-0005
High Slew Rate Operational Amplifier
Description
The HFA-0005 is an all bipolar op amp featuring high slew rate (420V/s), and high unity gain bandwidth (300MHz). These features combined with fast settling time (20ns) make this product very useful in high speed data acquisition systems as well as RF, video, and pulse amplifier designs. Other outstanding characteristics include low bias currents (15A), low offset current (6A), and low offset voltage (6mV). These high performance characteristics are achieved with only 40mA of supply current. The HFA-0005 offers high performance at low cost. It can replace hybrids and RF transistor amplifiers, simplifying designs while providing increased reliability due to monolithic construction. To enhance the ease of design, the HFA-0005 has a 50 20% resistor connected from the output of the op amp to a separate pin. This can be used when driving 50 strip line, microstrip, or coax cable.
Features
* Unity Gain Bandwidth . . . . . . . . . . . . . . . . . . . . 300MHz * Full Power Bandwidth . . . . . . . . . . . . . . . . . . . . . 22MHz * High Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . . 420V/s * High Output Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA * Monolithic Bipolar Construction
Applications
* RF/IF Processors * Video Amplifiers * Radar Systems * Pulse Amplifiers * High Speed Communications * Fast Data Acquisition Systems
Part Number Information
PART NUMBER HFA2-0005-5 HFA2-0005-9 HFA3-0005-5 HFA3-0005-9 HFA7-0005-5 HFA7-0005-9 HFA9P0005-5 TEMPERATURE RANGE 0oC to +75oC -40oC to +85oC 0oC to +75oC -40oC to +85oC 0
oC
PACKAGE 8 Pin Can 8 Pin Can 8 Lead Plastic DIP 8 Lead Plastic DIP 8 Lead Ceramic Sidebraze DIP 8 Lead Ceramic Sidebraze DIP 8 Lead SOIC
to
+75oC
-40oC to +85oC 0oC to +75oC
Pinouts
HFA-0005 (PDIP, CDIP, SOIC) TOP VIEW
NC 1 -IN 2 +IN 3 V- 4 + 8 7 6 5 RSENSE V+ OUT NC +IN 3 4 VNC 1 -IN 2
HFA-0005 (TO-99 METAL CAN) TOP VIEW
RSENSE 8 7 V+ 6 OUT 5 NC
+
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. 2002. All Rights Reserved 1
File Number
2918.2
DB500
Specifications HFA-0005
Absolute Maximum Ratings (Note 1)
Voltage Between V+ and V- Terminals . . . . . . . . . . . . . . . . . . . 12V Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA Junction Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +175oC Junction Temperature (Plastic Packages) . . . . . . . . . . . . . . +150oC Lead Temperature (Soldering 10 Sec.) . . . . . . . . . . . . . . . . . 300oC
Operating Conditions
Operating Temperature Range HFA-0005-9 . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC TA +85oC HFA-0005-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC TA +75oC Storage Temperature Range . . . . . . . . . . . . . -65oC TA +150oC
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.
Electrical Specifications
PARAMETERS INPUT CHARACTERISTICS Offset Voltage
V+ = +5V, V- = -5V, Unless Otherwise Specified HFA-0005-9 TEMP +25oC Full MIN TYP MAX MIN HFA-0005-5 TYP MAX UNITS
3 -
6 11 100 15 20 6 12 10 2
15 45 50 50 25 50 -
3 -
6 11 100 15 20 6 12 10 2
30 35 100 100 50 50 -
mV mV V/oC A A A A V k pF VRMS VRMS nV/Hz nV/Hz nV/Hz
Average Offset Voltage Drift Bias Current
Full +25oC Full
oC
Offset Current
+25
Full Common Mode Range Differential Input Resistance Input Capacitance Input Noise Voltage 0.1Hz to 10Hz 10Hz to 1MHz Input Noise Voltage fO = 10Hz fO = 100Hz fO = 100kHz Input Noise Current fO = 10Hz fO = 100Hz fO = 1000Hz TRANSFER CHARACTERISTICS Large Signal Voltage Gain (Note 2) +25oC High Low Common Mode Rejection Ratio (Note 3) Unity Gain Bandwidth Minimum Stable Gain OUTPUT CHARACTERISTICS Output Voltage Swing RL = 100 RL = 1k Full Power Bandwidth (Note 5) Output Resistance, Open Loop Output Current +25oC Full +25oC +25oC Full Full +25oC Full +25oC +25oC +25oC +25oC +25 C +25oC
o
Full +25oC +25oC +25oC +25oC
-
2.5 5.8
-
-
2.5 5.8
-
-
450 160 5
-
-
450 160 5
-
-
2.0 0.57 0.11
-
-
2.0 0.57 0.11
-
nA/Hz nA/Hz nA/Hz
150 150 150 45 1
230 180 250 47 300 -
-
150 150 150 42 1
230 180 250 45 300 -
-
V/V V/V V/V dB MHz V/V
3.5 25
3.5 4.0 22 3.0 50
-
3.5 25
3.5 4.0 22 3.0 50
-
V V MHz mA
2
Specifications HFA-0005
Electrical Specifications
PARAMETERS TRANSIENT RESPONSE Rise Time (Note 4, 6) Slew Rate (Note 7) Settling Time (3V Step) 0.1% Overshoot (Note 4, 6) POWER SUPPLY CHARACTERISTICS Supply Current +25oC Full Power Supply Rejection Ratio (Note 8) NOTES: 1. Absolute maximum ratings are limiting values, applied individually, beyond which the serviceability of the circuit may be impaired. Functional operation under any of these conditions is not necessarily implied. 2. VOUT = 0 to 2V, RL = 1k. 3. VCM = 2V. 4. RL = 100. 5. Full Power Bandwidth is calculated by equation: FP BW 6. VOUT = 200mV, AV = +1. 7. VOUT = 3V, AV = +1. 8. VS = 4V to 6V. 9. See Thermal Constants in "Applications Information" section. Maximum power dissipation, including output load, must be designed to maintain the junction temperature below +175oC for hermetic packages, and below +150oC for plastic packages. +25oC 40 35 37 42 40 40 37 35 37 40 40 45 mA mA dB +25oC +25oC +25oC +25oC 480 420 20 30 480 420 20 30 ps V/s ns % V+ = +5V, V- = -5V, Unless Otherwise Specified (Continued) HFA-0005-9 TEMP MIN TYP MAX MIN HFA-0005-5 TYP MAX UNITS
= ------------------ , V PEAK = 2 V PEAK
Slew Rate
3.0V .
Simplified Schematic Diagram
V+ RSENSE +
Die Characteristics
Thermal Constants (oC/W) CAN . . . . . . . . . . . . . . . . . . PDIP . . . . . . . . . . . . . . . . . CDIP . . . . . . . . . . . . . . . . . SOIC . . . . . . . . . . . . . . . . . JA 120 98 75 158 JC 37 36 13 43
-
+IN
-IN
OUT
+
-
V-
3
HFA-0005 Test Circuits
VIN 50 + 50 VOUT 1k 20pF VIN 50 + 50 VOUT 100
FIGURE 1. LARGE SIGNAL RESPONSE TEST CIRCUIT
FIGURE 2. SMALL SIGNAL RESPONSE TEST CIRCUIT
LARGE SIGNAL RESPONSE VOUT = 0 to 3V Vertical Scale: 1V/Div. Horizontal Scale: 5ns/Div.
SMALL SIGNAL RESPONSE VOUT = 0 to 200mV Vertical Scale: 100mV/Div. Horizontal Scale: 2ns/Div.
3V 200mV VIN VIN 0V 0V 3V 200mV VOUT VOUT 0V 0V
NOTE: Initial step in output is due to fixture feedthrough
PROPAGATION DELAY Vertical Scale: 500mV/Div. Horizontal Scale: 5ns/Div. AV = +1, RL = 1k, VOUT = 0 to 3V
VSETTLE
3V
1k
1k 100
100 VIN + 0V VOUT
NOTE: Test fixture delay of 450ps is included
FIGURE 3. SETTLING TIME SCHEMATIC
4
HFA-0005 Typical Performance Curves
50 40 GAIN (dB) 30 20 PHASE MARGIN (DEGREES) 10 0 180 PHASE 135 90 45 300K 1M 10M 100M FREQUENCY (Hz) 0 1G GAIN (dB) GAIN
VS = 5V, TA = +25oC, Unless Otherwise Specified
RL = 100 30 20 10 0 -10 -20
VIN + 50 50
VOUT 100
GAIN PHASE MARGIN (DEGREES) 1G PHASE MARGIN (DEGREES)
PHASE
180 135
AV = +1, RL = 100, RF = 50 VIN = 70.7mVRMS 1M 10M 100M FREQUENCY (Hz)
90 45 0 1G
FIGURE 4. OPEN LOOP GAIN AND PHASE vs FREQUENCY
FIGURE 5. CLOSED LOOP GAIN vs FREQUENCY
30 30 GAIN (dB) 20 GAIN (dB) 10 GAIN PHASE MARGIN (DEGREES) 0 -10 PHASE -20 VIN 50 + 100 VOUT 100 180 135 90 45 1M 10M 100M FREQUENCY (Hz) 0 1G 20 10 0 -10 -20 GAIN
AV = +10, RL = 100
180 VIN + 900 100 VOUT 100 PHASE 135 90 45 10M FREQUENCY (Hz) 100M 0 1G
100K
1M
FIGURE 6. CLOSED LOOP GAIN vs FREQUENCY
80 70 60 CMRR (dB) PSRR (dB) 50 40 30 20 10 0 100K 80 70 60 50 40
FIGURE 7. CLOSED LOOP GAIN vs FREQUENCY
-PSRR 30 +PSRR 20 10 0 100K
1M
10M FREQUENCY (Hz)
100M
1G
1M
10M FREQUENCY (Hz)
100M
FIGURE 8. CMRR vs FREQUENCY
FIGURE 9. PSRR vs FREQUENCY
5
HFA-0005 Typical Performance Curves
20 15 OFFSET VOLTAGE (mV) 10 BIAS CURRENT (A) 5 0 -5 -10 -15 -20 -25 -60 -40 -20 0 20 40 60 80 100 120
VS = 5V, TA = +25oC, Unless Otherwise Specified (Continued)
50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (oC)
TEMPERATURE (oC)
FIGURE 10. OFFSET VOLTAGE vs TEMPERATURE (3 REPRESENTATIVE UNITS)
30 20 OFFSET CURRENT (A)
FIGURE 11. BIAS CURRENT vs TEMPERATURE (3 REPRESENTATIVE UNITS)
350 300 -AVOL OPEN LOOP GAIN (V/V) 250 +AVOL 200 150 100 50 0 -60
10 0 -10 -20 -30 -40 -50 -60
RL = 1k, VOUT = 0 to 2V -40 -20 0 20 40 60 80 100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (oC)
TEMPERATURE (oC)
FIGURE 12. OFFSET CURRENT vs TEMPERATURE (3 REPRESENTATIVE UNITS)
5.0 4.8 OUTPUT VOLTAGE SWING (V) 4.6 4.4 SLEW RATE (V/s) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 -60 -40 -20 0 20 40 60 80 100 120
FIGURE 13. OPEN LOOP GAIN vs TEMPERATURE
RL = 1k
600 - SLEW RATE 500 + SLEW RATE
400
300
200 100 AV = +1, RL = 100, VOUT = 3V 0 -60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (oC)
TEMPERATURE (C)
FIGURE 14. OUTPUT VOLTAGE SWING vs TEMPERATURE
FIGURE 15. SLEW RATE vs TEMPERATURE
6
HFA-0005 Typical Performance Curves
70 60 80 50 CMRR (dB) 40 30 20 10 0 -60 PSRR (dB) 70 60 50 40 30 20 10 -40 -20 0 20 40 60 80 100 120 0 -60 -40 -20 0 20 40 60 80 100 120 +PSRR -PSRR
VS = 5V, TA = +25oC, Unless Otherwise Specified (Continued)
100 90 VS = 4V to 6V
TEMPERATURE (oC)
TEMPERATURE (oC)
FIGURE 16. CMRR vs TEMPERATURE
34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 0.5 45 40 SUPPLY CURRENT (mA) 35 30 25 20 15 10 -60
FIGURE 17. PSRR vs TEMPERATURE
SUPPLY CURRENT (mA)
1.5
2.5 3.5 SUPPLY VOLTAGE (V)
4.5
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
FIGURE 18. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 19. SUPPLY CURRENT vs TEMPERATURE
700 PEAK OUTPUT VOLTAGE SWING (V) AV = +1, RL = 100 VOUT = 0 TO 200mV
5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
AV = +1, RL = 1k, THD 1%
600
RISE TIME (ps)
500
400
300
200
100 -60
-40
-20
0
20
40
60
80
100
120
0 1M
10M
100M
1G
TEMPERATURE (oC)
FREQUENCY (Hz)
FIGURE 20. RISE TIME vs TEMPERATURE
FIGURE 21. MAXIMUM OUTPUT VOLTAGE SWING vs FREQUENCY
7
HFA-0005 Typical Performance Curves
5.0 4.5 OUTPUT VOLTAGE SWING (V) +VOUT OPEN LOOP GAIN (V/ V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 10 100 1K LOAD RESISTANCE () 10K -VOUT
VS = 5V, TA = +25oC, Unless Otherwise Specified (Continued)
250 225 200 175 150 125 100 75 50 25 0 10 100 1K LOAD RESISTANCE () 10K -A VOL +AVOL VOUT = 0 to 3V
FIGURE 22. OUTPUT VOLTAGE SWING vs LOAD RESISTANCE
10 9 NOISE VOLTAGE (V/Hz) 8 7 6 5 4 3 2 1 0 1 10 100 1K 10K FREQUENCY (Hz) NOISE VOLTAGE NOISE CURRENT 10 9 NOISE CURRENT (nA/Hz) NOISE VOLTAGE (nV/Hz) 8 7 6 5 4 3 2 1 0 100K
FIGURE 23. OPEN LOOP GAIN vs LOAD RESISTANCE
800 700 600 500 400 300 200 100 0 100 NOISE VOLTAGE NOISE CURRENT 800 700 600 500 400 300 200 100 0 100K NOISE CURRENT (pA/ Hz)
1K
10K
FREQUENCY (Hz)
FIGURE 24. INPUT NOISE vs FREQUENCY
FIGURE 25. INPUT NOISE vs FREQUENCY
FIGURE 26. INPUT NOISE VOLTAGE AV = 50, Noise Voltage = 1.646VRMS (RTI)
FIGURE 27. INPUT NOISE VOLTAGE AV = 50, Noise Voltage = 5.568VRMS (RTI)
8
HFA-0005 Applications Information
Offset Adjustment When applications require the offset voltage to be as low as possible, the figure below shows two possible schemes for adjusting offset voltage.
RF +5V VIN 50K R1 100K -5V R2 100 RI 50 + VOUT VIN + 50 50 COAX CABLE
VOUT
50 RF
FIGURE 30.
PC board traces can be made to look like a 50 or 75 transmission line, called microstrip. Microstrip is a PC board trace with a ground plane directly beneath, on the opposite side of the board, as shown in Figure 31.
SIGNAL TRACE w t
Adjustment Range
1
FIGURE 28. INVERTING GAIN
For a voltage follower application, use the circuit in Figure 29 without R2 and with RI shorted. R1 should then be 1M to 10M, so the adjustment resistors will cause only a very small gain error.
+V R1 100K 50K
VIN RI R2 100
+
RF
-V
Adjustment Range
G a in
1
FIGURE 29. NON-INVERTING GAIN
PC Board Layout Guidelines When designing with the HFA-0005, good high frequency (RF) techniques should be used when making a PC board. A massive ground plane should be used to maintain a low impedance ground. Proper shielding and use of short interconnection leads are also very important. To achieve maximum high frequency performance, the use of low impedance transmission lines with impedance matching is recommended: 50 lines are common in communications and 75 lines in video systems. Impedance matching is important to minimize reflected energy therefore minimizing transmitted signal distortion. This is accomplished by using a series matching resistor (50 or 75), matched transmission line (50 or 75), and a matched terminating resistor, as shown in Figure 30. Note that there will be a 6dB loss from input to output. The HFA-0005 has an integral 50 20% resistor connected to the op amp's output with the other end of the resistor pinned out. This 50 resistor can be used as the series resistor instead of an external resistor.

V R 2 ---
R
F 1 + --------------R +R I 2
R
Power supply decoupling is essential for high frequency op amps. A 0.01F high quality ceramic capacitor at each supply pin in parallel with a 1F tantalum capacitor will provide excellent decoupling. Chip capacitors produce the best results due to ease of placement next to the op amp and they have negligible lead inductance. If leaded capacitors are used, the leads should be kept as short as possible to minimize lead inductance. The figures that follow illustrate two different decoupling schemes. Figure 33 improves the PSRR because the resistor and capacitors create low pass filters. Note that the supply current will create a voltage drop across the resistor.
V+ 1.0F
0.01F + 0.01F
1.0F V-
FIGURE 32.
9

GROUND PLANE VOUT
V R ----
R
2
h ER
DIELECTRIC (PC BOARD)
FIGURE 31.
When manufacturing pc boards the trace width can be calculated based on a number of variables. The following equation is reasonably accurate for calculating the proper trace width for a 50 transmission line. 87 5.98h Z = ------------------------- In ----------------- 0 0.8 w + t E + 1.41 R
HFA-0005
V+ C
Saturation Recovery When an op amp is over driven output devices can saturate and sometimes take a long time to recover. By clamping the input to safe levels, output saturation can be avoided. If output saturation cannot be avoided, the recovery time from 25% overdrive is 20ns and 30ns from 50% overdrive.
R C + C
R C
V-
FIGURE 33.
10

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