Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier Features General Description • 120MHz -3dB bandwidth • Unity-gain stable • Low supply current = 5.2mA at VS = ±15V • Wide supply range = ±2V to ±18V dual-supply = 2.5V to 36V single-supply • High slew rate = 325V/µs • Fast settling = 80ns to 0.1% for a 10V step • Low differential gain = 0.04% at AV = +2, RL = 150Ω • Low differential phase = 0.15° at AV = +2, RL = 150Ω • Stable with unlimited capacitive load • Wide output voltage swing = ±13.6V with VS = ±15V, RL = 1000Ω = 3.8V/0.3V with VS = +5V, RL = 500Ω • Low cost, enhanced replacement for the AD847 and LM6361 The EL2044C is a high speed, low power, low cost monolithic operational amplifier built on Elantec's proprietary complementary bipolar process. The EL2044C is unity-gain stable and features a 325V/µs slew rate and 120MHz gain-bandwidth product while requiring only 5.2 mA of supply current. EL2044C EL2044C The power supply operating range of the EL2044C is from ±18V down to as little as ±2V. For single-supply operation, the EL2044C operates from 36V down to as little as 2.5V. The excellent power supply operating range of the EL2044C makes it an obvious choice for applications on a single +5V supply. The EL2044C also features an extremely wide output voltage swing of ±13.6V with VS = ±15V and RL = 1000Ω. At ±5V, output voltage swing is a wide ±3.8V with RL = 500Ω and ±3.2V with RL = 150Ω. Furthermore, for single-supply operation at +5V, output voltage swing is an excellent 0.3V to 3.8V with RL = 500Ω. At a gain of +1, the EL2044C has a -3dB bandwidth of 120MHz with a phase margin of 50°. It can drive unlimited load capacitance, and because of its conventional voltage-feedback topology, the EL2044C allows the use of reactive or non-linear elements in its feedback network. This versatility combined with low cost and 75mA of outputcurrent drive makes the EL2044C an ideal choice for price-sensitive applications requiring low power and high speed. Applications Video amplifier Single-supply amplifier Active filters/integrators High-speed sample-and-hold High-speed signal processing ADC/DAC buffer Pulse/RF amplifier Pin diode receiver Log amplifier Photo multiplier amplifier Difference amplifier Connection Diagram DIP and SO Package Ordering Information Part No. Temp. Range Package Outline # EL2044CN -40°C to +85°C 8-Pin P-DIP MDP0031 EL2044CS -40°C to +85°C 8-Lead SO MDP0027 Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation. © 2001 Elantec Semiconductor, Inc. September 26, 2001 • • • • • • • • • • • EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier Absolute Maximum Ratings (T Supply Voltage (VS) Peak Output Current (IOP) Output Short-Circuit Duration A = 25°C) ±18V or 36V Short-Circuit Protected Infinite Power Dissipation (PD) Operating Temperature Range (TA) Operating Junction Temperature (TJ) Storage Temperature (TST) (A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.) Input Voltage (VIN) Differential Input Voltage (dVIN) ±VS ±10V See Curves -40°C to +85°C 150°C -65°C to +150°C Important Note: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA. DC Electrical Characteristics VS = ±15V, RL = 1000Ω, unless otherwise specified Parameter VOS TCVOS Description Condition Input Offset Voltage VS = ±15V Average Offset (Note 2) Temp Min 25°C Typ Max Unit 0.5 7.0 mV TMIN, T MAX 13.0 All 10.0 25°C 2.8 mV µV/°C Voltage Drift IB IOS Input Bias Current VS = ±15V VS = ±5V 25°C 2.8 Input Offset Current VS = ±15V 25°C 50 TMIN, T MAX TMIN, T MAX VS = ±5V TCIOS Average Offset Current Drift [1] AVOL Open-Loop Gain VS = ±15V,VOUT = ±10V, RL = 1000Ω PSRR CMRR CMIR VOUT ISC 8.2 µA 11.2 µA µA 300 nA 500 nA 25°C 50 nA All 0.3 nA/°C 25°C 800 TMIN, T MAX 600 1500 V/V V/V VS = ±5V, V OUT = ±2.5V, RL = 500Ω 25°C 1200 V/V VS = ±5V, V OUT = ±2.5V, RL = 150Ω 25°C 1000 V/V Power Supply Rejection Ratio VS = ±5V to ±15V 25°C 65 TMIN, T MAX 60 Common-Mode Rejection Ratio VCM = ±12V, VOUT = 0V 25°C 70 TMIN, T MAX 70 Common-Mode Input Range VS = ±15V 25°C ±14.0 V VS = ±5V 25°C ±4.2 V VS = +5V 25°C 4.2/0.1 V VS = ±15V, RL = 1000Ω 25°C ±13.4 TMIN, T MAX ±13.1 VS = ±15V, RL = 500Ω 25°C ±12.0 ±13.4 V VS = ±5V, RL = 500Ω 25°C ±3.4 ±3.8 V VS = ±5V, RL = 150Ω 25°C ±3.2 V VS = +5V, RL = 500Ω 25°C 3.6/0.4 TMIN, T MAX 3.5/0.5 Output Voltage Swing Output Short Circuit Current 2 25°C 40 TMIN, T MAX 35 80 dB dB 90 dB dB ±13.6 V V 3.8/0.3 V V 75 mA mA DC Electrical Characteristics (Continued) VS = ±15V, RL = 1000Ω, unless otherwise specified Parameter IS Description Supply Current Condition Temp VS = ±15V, No Load Min 25°C Typ Max 5.2 7 mA 7.6 mA TMIN, T MAX RIN Input Resistance Unit VS = ±5V, No Load 25°C 5.0 Differential 25°C 150 mA kΩ Common-Mode 25°C 15 MΩ CIN Input Capacitance AV = +1@ 10MHz 25°C 1.0 pF ROUT Output Resistance AV = +1 25°C 50 mΩ PSOR Power-Supply Operating Range Dual-Supply 25°C ±2.0 ±18.0 V Single-Supply 25°C 2.5 36.0 V 1. Measured from T MIN to TMAX. 3 EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier Closed-Loop AC Electrical Characteristics VS = ±15V, AV = +1, RL = 1000¾ unless otherwise specified Parameter BW GBWP Description -3 dB Bandwidth (VOUT = 0.4 VPP) Gain-Bandwidth Product Condition Min Typ Max Unit 25°C 120 MHz VS = ±15V, AV = -1 25°C 60 MHz VS = ±15V, AV = +2 25°C 60 MHz VS = ±15V, AV = +5 25°C 12 MHz VS = ±15V, AV = +10 25°C 6 MHz VS = ±5V, AV = +1 25°C 80 MHz VS = ±15V 25°C 60 MHz VS = ±5V 25°C 45 MHz RL = 1 kΩ, CL = 10 pF 25°C 50 ° VS = ±15V, RL = 1000Ω 25°C 325 V/µs VS = ±5V, RL = 500Ω 25°C VS = ±15V 25°C PM Phase Margin SR Slew Rate FPBW Full-Power Bandwidth [2] VS = ±5V tr, tf Rise Time, Fall Time 0.1V Step OS Overshoot 0.1V Step tPD Propagation Delay ts Settling to +0.1% (AV = +1) VS = ±15V, 10V Step dG Differential Gain [3] NTSC/PAL dP Differential Phase (Note 5) eN [1] Temp VS = ±15V, AV = +1 250 200 V/µs 5.2 MHz 25°C 12.7 MHz 25°C 3.0 ns 25°C 20 % 25°C 2.5 ns 25°C 80 ns 60 ns 25°C 0.04 % NTSC/PAL 25°C 0.15 ° Input Noise Voltage 10kHz 25°C 15.0 nV/√Hz iN Input Noise Current 10kHz 25°C 1.50 pA/√Hz CI STAB Load Capacitance Stability AV = +1 25°C Infinite pF VS = ±5V, 5V Step 4.0 1. Slew rate is measured on rising edge. 2. For VS = ±15V, VOUT = 20VPP. For VS = ±5V, VOUT = 5VPP. Full-power bandwidth is based on slew rate measurement using: FPBW = SR/(2π * Vpeak). 3. Video Performance measured at VS = ±15V, AV = +2 with 2 times normal video level across RL = 150Ω. This corresponds to standard video levels across a back-terminated 75Ω load. For other values of RL, see curves. 4 Typical Performance Curves Non-Inverting Frequency Response Inverting Frequency Response Frequency Response for Various Load Resistances Open-Loop Gain and Phase vs Frequency Output Voltage Swing vs Frequency Equivalent Input Noise 2nd and 3rd Harmonic Distortion vs Frequency Settling Time vs Output Voltage Change CMRR, PSRR and Closed-Loop Output Resistance vs Frequency Supply Current vs Supply Voltage Common-Mode Input Range vs Supply Voltage 5 Output Voltage Range vs Supply Voltage EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier Gain-Bandwidth Product vs Supply Voltage Open-Loop Gain vs Supply Voltage Slew-Rate vs Supply Voltage Bias and Offset Current vs Input Common-Mode Voltage Open-Loop Gain vs Load Resistance Voltage Swing vs Load Resistance Offset Voltage vs Temperature Bias and Offset Current vs Temperature Supply Current vs Temperature Gain-Bandwidth Product vs Temperature Open-Loop Gain PSRR and CMRR vs Temperature Slew Rate vs Temperature 6 Short-Circuit Current vs Temperature Gain-Bandwidth Product vs Load Capacitance Small-Signal Step Response Overshoot vs Load Capacitance Short-Circuit Current Large-Signal Differential Gain and Phase vs DC Input Offset at 3.58MHz Differential Gain and Phase vs DC Input Offset at 4.43MHz Differential Gain and Phase vs Number of 150Ω Loads at 3.58MHz Differential Gain and Phase vs Number of 150Ω Loads at 4.43MHz 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 8-Lead SO Maximum Power Dissipation vs Ambient Temperature 7 EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier Simplified Schematic Burn-In Circuit All Packages Use the Same Schematic 8 Applications Information Product Description 60MHz at a gain of +2. It is important to note that the EL2044C has been designed so that this “extra” bandwidth in low-gain applications does not come at the expense of stability. As seen in the typical performance curves, the EL2044C in a gain of +1 only exhibits 1.0dB of peaking with a 1000Ω load. The EL2044C is a low-power wideband monolithic operational amplifier built on Elantec's proprietary highspeed complementary bipolar process. The EL2044C uses a classical voltage-feedback topology which allows it to be used in a variety of applications where currentfeedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. The conventional topology of the EL2044C allows, for example, a capacitor to be placed in the feedback path, making it an excellent choice for applications such as active filters, sample-and-holds, or integrators. Similarly, because of the ability to use diodes in the feedback network, the EL2044C is an excellent choice for applications such as fast log amplifiers. Video Performance An industry-standard method of measuring the video distortion of a component such as the EL2044C is to measure the amount of differential gain (dG) and differential phase (dP) that it introduces. To make these measurements, a 0.286VPP (40 IRE) signal is applied to the device with 0V DC offset (0 IRE) at either 3.58MHz for NTSC or 4.43MHz for PAL. A second measurement is then made at 0.714V DC offset (100 IRE). Differential gain is a measure of the change in amplitude of the sine wave, and is measured in percent. Differential phase is a measure of the change in phase, and is measured in degrees. Single-Supply Operation The EL2044C has been designed to have a wide input and output voltage range. This design also makes the EL2044C an excellent choice for single-supply operation. Using a single positive supply, the lower input voltage range is within 100mV of ground (RL = 500Ω), and the lower output voltage range is within 300mV of ground. Upper input voltage range reaches 4.2V, and output voltage range reaches 3.8V with a 5V supply and RL = 500Ω. This results in a 3.5V output swing on a single 5V supply. This wide output voltage range also allows single-supply operation with a supply voltage as high as 36V or as low as 2.5V. On a single 2.5V supply, the EL2044C still has 1V of output swing. For signal transmission and distribution, a back-terminated cable (75Ω in series at the drive end, and 75Ω to ground at the receiving end) is preferred since the impedance match at both ends will absorb any reflections. However, when double termination is used, the received signal is halved; therefore a gain of 2 configuration is typically used to compensate for the attenuation. The EL2044C has been designed as an economical solution for applications requiring low video distortion. It has been thoroughly characterized for video performance in the topology described above, and the results have been included as typical dG and dP specifications and as typical performance curves. In a gain of +2, driving 150¾, with standard video test levels at the input, the EL2044C exhibits dG and dP of only 0.04% and 0.15° at NTSC and PAL. Because dG and dP can vary with different DC offsets, the video performance of the EL2044C has been characterized over the entire DC offset range from -0.714V to +0.714V. For more information, refer to the curves of dG and dP vs DC Input Offset. Gain-Bandwidth Product and the -3dB Bandwidth The EL2044C has a gain-bandwidth product of 60MHz while using only 5.2mA of supply current. For gains greater than 4, its closed-loop -3dB bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit. For gains less than 4, higher-order poles in the amplifier's transfer function contribute to even higher closed loop bandwidths. For example, the EL2044C has a -3dB bandwidth of 120MHz at a gain of +1, dropping to 9 EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier The output drive capability of the EL2044C allows it to drive up to 2 back-terminated loads with good video performance. For more demanding applications such as greater output drive or better video distortion, a number of alternatives such as the EL2120C, EL400C, or EL2073C should be considered. the device pins as possible. For good AC performance, parasitic capacitances should be kept to a minimum at both inputs and at the output. Resistor values should be kept under 5kΩ because of the RC time constants associated with the parasitic capacitance. Metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low-inductance for best performance. Output Drive Capability The EL2044C has been designed to drive low impedance loads. It can easily drive 6VPP into a 150Ω load. This high output drive capability makes the EL2044C an ideal choice for RF, IF and video applications. Furthermore, the current drive of the EL2044C remains a minimum of 35mA at low temperatures. The EL2044C is current-limited at the output, allowing it to withstand shorts to ground. However, power dissipation with the output shorted can be in excess of the power-dissipation capabilities of the package. The EL2044C Macromodel This macromodel has been developed to assist the user in simulating the EL2044C with surrounding circuitry. It has been developed for the PSPICE simulator (copywritten by the Microsim Corporation), and may need to be rearranged for other simulators. It approximates DC, AC, and transient response for resistive loads, but does not accurately model capacitive loading. This model is slightly more complicated than the models used for lowfrequency op-amps, but it is much more accurate for AC analysis. Capacitive Loads For ease of use, the EL2044C has been designed to drive any capacitive load. However, the EL2044C remains stable by automatically reducing its gain-bandwidth product as capacitive load increases. Therefore, for maximum bandwidth, capacitive loads should be reduced as much as possible or isolated via a series output resistor (RS). Similarly, coax lines can be driven, but best AC performance is obtained when they are terminated with their characteristic impedance so that the capacitance of the coaxial cable will not add to the capacitive load seen by the amplifier. Although stable with all capacitive loads, some peaking still occurs as load capacitance increases. A series resistor at the output of the EL2044C can be used to reduce this peaking and further improve stability. The model does not simulate these characteristics accurately: Printed-Circuit Layout The EL2044C is well behaved, and easy to apply in most applications. However, a few simple techniques will help assure rapid, high quality results. As with any highfrequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1µF ceramic capacitor is recommended for bypassing both supplies. Lead lengths should be as short as possible, and bypass capacitors should be as close to 10 noise non-linearities settling-time temperature effects CMRR PSRR manufacturing variations EL2044C Macromodel IN+IN+IN+IN+IN+IN+NININININ * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt M2044 3 2 7 4 6 * * Input stage * ie 7 37 1mA r6 36 37 800 r7 38 37 800 rc1 4 30 850 rc2 4 39 850 q1 30 3 36 qp q2 39 2 38 qpa ediff 33 0 39 30 1.0 rdiff 33 0 1Meg * * Compensation Section * ga 0 34 33 0 1m rh 34 0 2Meg ch 34 0 1.3pF rc 34 40 1K cc 40 0 1pF * * Poles * ep 41 0 40 0 1 rpa 41 42 200 cpa 42 0 1pF rpb 42 43 200 cpb 43 0 1pF * * Output Stage * ios1 7 50 1.0mA ios2 51 4 1.0mA q3 4 43 50 qp q4 7 43 51 qn q5 7 50 52 qn q6 4 51 53 qp ros1 52 6 25 ros2 6 53 25 * * Power Supply Current * ips 7 4 2.7mA * IN+IN+IN+IN+IN+IN+NININININ * Models * .model qn npn(is=800E-18 bf=200 tf=0.2nS) .model qpa pnp(is=864E-18 bf=100 tf=0.2nS) .model qp pnp(is=800E-18 bf=125 tf=0.2nS) .ends 11 EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier EL2044C Macromodel 12 EL2044C EL2044C Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. September 26, 2001 WARNING - Life Support Policy Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages. Elantec Semiconductor, Inc. 675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 (888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6020 Japan Technical Center: +81-45-682-5820 13 Printed in U.S.A.