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 10