HFA1205 September 1998 File Number 3605.5 Dual, 400MHz, Low Power, Video Operational Amplifier Features The HFA1205 is a dual, high speed, low power current feedback amplifier built with Intersil’s proprietary complementary bipolar UHF-1 process. • High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 2MΩ • Low Supply Current . . . . . . . . . . . . . . . . . 5.8mA/Op Amp These amplifiers deliver 400MHz bandwidth and 1275V/µs slew rate, on only 60mW of quiescent power. They are specifically designed to meet the performance, power, and cost requirements of high volume video applications. The excellent gain flatness and differential gain/phase performance make these amplifiers well suited for component or composite video applications. Video performance is maintained even when driving a back terminated cable (RL = 150Ω), and degrades only slightly when driving two back terminated cables (RL = 75Ω). RGB applications will benefit from the high slew rates, and high full power bandwidth. The HFA1205 is a pin compatible, low power, high performance upgrade for the popular Intersil HA5023. For a dual amplifier with output disable capability, please see the HFA1245 datasheet. TEMP. RANGE (oC) • Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 1275V/µs • Gain Flatness (to 50MHz) . . . . . . . . . . . . . . . . . . . . ±0.03dB • Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03% • Differential Phase . . . . . . . . . . . . . . . . . . . . 0.03 Degrees • Pin Compatible Upgrade to HA5023 Applications • Flash A/D Drivers • High Resolution Monitors • Video Switching and Routing • Professional Video Processing • Video Digitizing Boards/Systems • Multimedia Systems • RGB Preamps Ordering Information PART NUMBER (BRAND) • Wide -3dB Bandwidth (AV = +2) . . . . . . . . . . . . . . 400MHz PACKAGE PKG. NO. • Medical Imaging • Hand Held and Miniaturized RF Equipment HFA1205IP -40 to 85 8 Ld PDIP E8.3 • Battery Powered Communications HFA1205IB (H1205I) -40 to 85 8 Ld SOIC M8.15 • High Speed Oscilloscopes and Analyzers HA5023EVAL High Speed Op Amp DIP Evaluation Board Pinout HFA1205 (PDIP, SOIC) TOP VIEW OUT1 1 -IN1 2 +IN1 3 V- 1 4 + + 8 V+ 7 OUT2 6 -IN2 5 +IN2 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999 HFA1205 Absolute Maximum Ratings Thermal Information Voltage Between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11V DC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8V Output Current (Note 2) . . . . . . . . . . . . . . . . .Short Circuit Protected 30mA Continuous 60mA ≤ 50% Duty Cycle ESD Rating Human Body Model (Per MIL-STD-883 Method 3015.7) . . . .600V Thermal Resistance (Typical, Note 1) θJA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 Maximum Junction Temperature (Die Only) . . . . . . . . . . . . . . . .175oC Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - 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. NOTES: 1. θJA is measured with the component mounted on an evaluation PC board in free air. 2. Output is short circuit protected to ground. Brief short circuits to ground will not degrade reliability, however continuous (100% duty cycle) output current must not exceed 30mA for maximum reliability. VSUPPLY = ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified Electrical Specifications PARAMETER (NOTE 3) TEST LEVEL TEMP. (oC) MIN TYP MAX UNITS A 25 - 2 5 mV A Full - 3 8 mV B Full - 1 10 µV/ oC ∆VCM = ±1.8V A 25 45 48 - dB ∆VCM = ±1.8V A 85 43 46 - dB ∆VCM = ±1.2V A -40 43 46 - dB ∆VPS = ±1.8V A 25 48 52 - dB ∆VPS = ±1.8V A 85 46 50 - dB ∆VPS = ±1.2V A -40 46 50 - dB A 25 - 6 15 µA A Full - 10 25 µA B Full - 5 60 nA/ oC ∆VPS = ±1.8V A 25 - 0.5 1 µA/V ∆VPS = ±1.8V A 85 - 0.8 3 µA/V ∆VPS = ±1.2V A -40 - 0.8 3 µA/V ∆VCM = ±1.8V A 25 0.8 2 - MΩ ∆VCM = ±1.8V A 85 0.5 1.3 - MΩ ∆VCM = ±1.2V A -40 0.5 1.3 - MΩ A 25 - 2 8.5 µA A Full - 5 15 µA B Full - 60 200 nA/ oC ∆VCM = ±1.8V A 25 - 3 6 µA/V ∆VCM = ±1.8V A 85 - 4 8 µA/ V ∆VCM = ±1.2V A -40 - 4 8 µA/V TEST CONDITIONS INPUT CHARACTERISTICS Input Offset Voltage Average Input Offset Voltage Drift Input Offset Voltage Common-Mode Rejection Ratio Input Offset Voltage Power Supply Rejection Ratio Non-Inverting Input Bias Current Non-Inverting Input Bias Current Drift Non-Inverting Input Bias Current Power Supply Sensitivity Non-Inverting Input Resistance Inverting Input Bias Current Inverting Input Bias Current Drift Inverting Input Bias Current Common-Mode Sensitivity 2 HFA1205 VSUPPLY = ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified (Continued) Electrical Specifications (NOTE 3) TEST LEVEL TEMP. (oC) MIN TYP MAX UNITS ∆VPS = ±1.8V A 25 - 2 5 µA/V ∆VPS = ±1.8V A 85 - 4 8 µA/V ∆VPS = ±1.2V A -40 - 4 8 µA/V Inverting Input Resistance C 25 - 60 - Ω Input Capacitance C 25 - 1.6 - pF Input Voltage Common Mode Range (Implied by VIO CMRR, +RIN, and -IBIAS CMS tests) A 25, 85 ±1.8 ±2.4 - V A -40 ±1.2 ±1.7 - V PARAMETER TEST CONDITIONS Inverting Input Bias Current Power Supply Sensitivity Input Noise Voltage Density f = 100kHz B 25 - 3.5 - nV/√Hz Non-Inverting Input Noise Current Density f = 100kHz B 25 - 2.5 - pA/√Hz Inverting Input Noise Current Density f = 100kHz B 25 - 20 - pA/√Hz AV = -1 C 25 - 500 - kΩ AV = +1, +RS = 432Ω B 25 - 280 - MHz AV = +2 B 25 - 400 - MHz AV = -1, RF = 332Ω B 25 - 360 - MHz AV = +1, RS = 432Ω B 25 - 140 - MHz AV = +2 B 25 - 125 - MHz AV = -1, RF = 332Ω B 25 - 180 - MHz To 25MHz B 25 - ±0.02 - dB To 50MHz B 25 - ±0.03 - dB A Full - 1 - V/V 5MHz B 25 - -60 - dB 10MHz B 25 - -54 - dB A 25 ±3 ±3.4 - V A Full ±2.8 ±3 - V A 25, 85 50 60 - mA A -40 28 42 - mA B 25 - 90 - mA TRANSFER CHARACTERISTICS Open Loop Transimpedance Gain AC CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified -3dB Bandwidth (VOUT = 0.2VP-P) Full Power Bandwidth (VOUT = 5VP-P at AV = +2/-1, 4VP-P at AV = +1) Gain Flatness (AV = +2,VOUT = 0.2VP-P) Minimum Stable Gain Crosstalk OUTPUT CHARACTERISTICS RF = 560Ω, Unless Otherwise Specified Output Voltage Swing AV = -1, RL = 100Ω Output Current AV = -1, RL = 50Ω Output Short Circuit Current Closed Loop Output Impedance DC, AV = +2, RF = 464Ω B 25 - 0.07 - Ω Second Harmonic Distortion (AV = +2, RF = 464Ω, VOUT = 2VP-P) 10MHz B 25 - -50 - dBc 20MHz B 25 - -45 - dBc Third Harmonic Distortion (AV = +2, RF = 464Ω, VOUT = 2VP-P) 10MHz B 25 - -55 - dBc 20MHz B 25 - -50 - dBc TRANSIENT CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified Rise and Fall Times (VOUT = 0.5VP-P) 3 Rise Time B 25 - 0.8 - ns Fall Time B 25 - 1.25 - ns HFA1205 VSUPPLY = ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified (Continued) Electrical Specifications PARAMETER TEST CONDITIONS (NOTE 3) TEST LEVEL TEMP. (oC) MIN TYP MAX UNITS Overshoot VOUT = 0.5VP-P, VIN t RISE = 2.5ns B 25 - 5 - % Slew Rate (VOUT = 4VP-P, AV = +1, +RS = 432Ω) +SR B 25 - 1050 - V/µs -SR B 25 - 750 - V/µs Slew Rate (VOUT = 5VP-P, AV = +2) +SR B 25 - 1375 - V/µs -SR B 25 - 875 - V/µs Slew Rate (VOUT = 5VP-P, AV = -1, RF = 332Ω) +SR B 25 - 2250 - V/µs -SR B 25 - 1275 - V/µs Settling Time (VOUT = +2V to 0V step) To 0.1% B 25 - 15 - ns To 0.05% B 25 - 20 - ns To 0.02% B 25 - 30 - ns VIN = ±2V B 25 - 10 - ns RL = 150Ω B 25 - 0.03 - % RL = 75Ω B 25 - 0.03 - % RL = 150Ω B 25 - 0.03 - Degrees RL = 75Ω B 25 - 0.05 - Degrees Power Supply Range C 25 ±4.5 - ±5.5 V Power Supply Current A 25 5.6 5.8 6.1 mA/ Op Amp A Full 5.4 5.9 6.3 mA/ Op Amp Overdrive Recovery Time VIDEO CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified Differential Gain (f = 3.58MHz) Differential Phase (f = 3.58MHz) POWER SUPPLY CHARACTERISTICS NOTE: 3. Test Level: A. Production Tested.; B. Typical or Guaranteed Limit Based on Characterization.; C. Design Typical for Information Only. Application Information Optimum Feedback Resistor Although a current feedback amplifier’s bandwidth dependency on closed loop gain isn’t as severe as that of a voltage feedback amplifier, there can be an appreciable decrease in bandwidth at higher gains. This decrease may 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 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 HFA1205 design is optimized for a 464Ω RF at a gain of +2. Decreasing RF decreases stability, resulting in excessive peaking and overshoot (Note: Capacitive feedback will cause the same problems due to the feedback impedance decrease at higher frequencies). At 4 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. For good channel-tochannel gain matching, it is recommended that all resistors (termination as well as gain setting) be ±1% tolerance or better. Note that a series input resistor, on +IN, is required for a gain of +1, to reduce gain peaking and increase stability. GAIN (ACL ) RF (Ω) BANDWIDTH (MHz) -1 332 360 +1 464 (+RS = 432Ω) 280 +2 464 400 HFA1205 Non-inverting Input Source Impedance PC Board Layout 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 SERIES OUTPUT RESISTANCE (Ω) For best operation, the DC source impedance seen by the non-inverting input should be ≥50Ω. This is especially important in inverting gain configurations where the noninverting input would normally be connected directly to GND. 40 30 20 10 0 Attention should be given to decoupling the power supplies. A large value (10µF) tantalum in parallel with a small value (0.1µF) chip capacitor works well in most cases. Terminated microstrip signal lines are recommended at the input and output of the device. Capacitance directly on the output must be minimized, or isolated as discussed in the next section. Care must also be taken to minimize the capacitance to ground seen by the amplifier’s inverting input (-IN). 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 -IN, and connections to -IN should be kept as short as possible. 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 280MHz (for AV = +1). By decreasing RS as CL increases (as illustrated in the curves), the maximum bandwidth is obtained without sacrificing stability. In spite of this, bandwidth decreases as the load capacitance increases. For example, at AV = +1, RS = 62Ω, CL = 40pF, the overall bandwidth is limited to 180MHz, and bandwidth drops to 70MHz at AV = +1, RS = 8Ω, CL = 400pF. 5 AV = +1 AV = +2 0 50 100 150 200 250 300 350 400 LOAD CAPACITANCE (pF) FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs LOAD CAPACITANCE Evaluation Board The performance of the HFA1205 may be evaluated using the HA5023 Evaluation Board. The feedback and gain setting resistors must be replaced with the appropriate value (see “Optimum Feedback Resistor” section) for the gain being evaluated. Also, replace the two 0Ω series output resistors with 50Ω resistors. To order evaluation boards (Part Number HA5023EVAL), please contact your local sales office. HFA1205 Typical Performance Curves VSUPPLY = ±5V, RF = Optimum Value From “Apps Info” Table, TA = 25oC, RL = 100Ω, Unless Otherwise Specified 200 2.0 AV = +2 150 1.5 100 1.0 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (mV) AV = +2 50 0 -50 -100 -150 0.5 0 -0.5 -1.0 -1.5 -200 -2.0 TIME (5ns/DIV.) TIME (5ns/DIV.) A V = -1 3 0 AV = +2 -3 AV = +1 -6 +180 +90 AV = +2 0 -90 AV = -1 AV = +1 1 -180 10 100 FREQUENCY (MHz) NORMALIZED GAIN (dB) VOUT = 200mVP-P FIGURE 3. LARGE SIGNAL PULSE RESPONSE NORMALIZED PHASE (DEGREES) NORMALIZED GAIN (dB) FIGURE 2. SMALL SIGNAL PULSE RESPONSE A V = -1 3 0 -3 -6 AV = +1 AV = +2 0.3 1000 FIGURE 4. FREQUENCY RESPONSE 1 10 FREQUENCY (MHz) 100 300 FIGURE 5. FULL POWER BANDWIDTH -40 VOUT = 200mVP-P RL = 100Ω -50 CROSSTALK (dB) NORMALIZED GAIN (dB) -45 0.3 0.2 AV = +2 0.1 0 -0.1 AV = +1 RL = 1kΩ -55 -60 -65 -70 -0.2 -75 -0.3 -80 -85 1 10 FREQUENCY (MHz) FIGURE 6. GAIN FLATNESS 6 100 0.3 1 10 FREQUENCY (MHz) FIGURE 7. CROSSTALK vs FREQUENCY 100 HFA1205 Die Characteristics DIE DIMENSIONS: SUBSTRATE POTENTIAL (Powered Up): 69 mils x 92 mils x 19 mils 1750µm x 2330µm x 483µm Floating (Recommend Connection to V-) PASSIVATION: METALLIZATION: Type: Nitride Thickness: 4kÅ ±0.5kÅ Type: Metal 1: AICu(2%)/TiW Thickness: Metal 1: 8kÅ ±0.4kÅ TRANSISTOR COUNT: Type: Metal 2: AICu(2%) Thickness: Metal 2: 16kÅ ±0.8kÅ 180 Metallization Mask Layout HFA1205 -IN1 OUT1 NC V+ NC OUT2 +IN1 NC NC -IN2 NC V- NC +IN2 All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. 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 7