200MHz Unity-Gain Stable Operational Amplifier Features General Description • 200MHz gain-bandwidth product • Unity-gain stable • Ultra low video distortion = 0.01%/0.015° @ NTSC/PAL • Conventional voltage-feedback topology • Low offset voltage = 200µV • Low bias current = 2µA • Low offset current = 0.1µA • Output current = 50mA over temperature • Fast settling = 13ns to 0.1% • Low distortion = -60dB HD2, ------70dB HD3 @ 20MHz, 2VPP, AV = +1 The EL2073C is a precision voltage-feedback amplifier featuring a 200MHz gain-bandwidth product, fast settling time, excellent differential gain and differential phase performance, and a minimum of 50mA output current drive over temperature. EL2073C EL2073C The EL2073C is unity-gain stable with a -3dB bandwidth of 400MHz. It has a very low 200µV of input offset voltage, only 2µA of input bias current, and a fully symmetrical differential input. Like all voltagefeedback operational amplifiers, the EL2073C allows the use of reactive or non-linear components in the feedback loop. This combination of speed and versatility makes the EL2073C the ideal choice for all op-amp applications requiring high speed and precision, including active filters, integrators, sample-and-holds, and log amps. The low distortion, high output current, and fast settling makes the EL2073C an ideal amplifier for signal-processing and digitizing systems. Applications • • • • • • • • • High resolution video Active filters/integrators High-speed signal processing ADC/DAC buffers Pulse/RF amplifiers Pin diode receivers Log amplifiers Photo multiplier amplifiers High speed sample-and-holds Ordering Information Part No. Temp. Range Package Outline # EL2073CN -40°C to +85°C 8-Pin P-DIP MDP0031 EL2073CS -40°C to +85°C 8-Lead SO MDP0027 Connection Diagrams DIP and SO Package September 26, 2001 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. EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier Absolute Maximum Ratings (T A = 25°C) Supply Voltage (VS) Output Current θJA = 95°C/W P-DIP θJA = 175°C/W SO-8 Operating Temperature -40°C to +85°C Junction Temperature 175°C Storage Temperature -60°C to +150°C Note: See EL2071/EL2171 for Thermal Impedance curves. ±7V Thermal Resistance Output is short-circuit protected to ground, however, maximum reliability is obtained if I OUT does not exceed 70mA. Common-Mode Input Differential Input Voltage ±VS 5V 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. Open Loop DC Electrical Characteristics VS = ±5V, RL = 100Ω, unless otherwise specified Parameter VOS Description Input Offset Voltage Test Conditions VCM = 0V Temp Min 25°C Typ Max 0.2 1.5 mV 3 mV TMIN, T MAX TCVOS Average Offset Voltage Drift IB Input Bias Current IOS Input Offset Current  All VCM = 0V 8 CMRR IS Power Supply Rejection Ratio  Common Mode Rejection Ratio  Supply Current—Quiescent No Load µV/°C 25°C 2 6 µA TMIN, T MAX 2 6 µA 25°C 0.1 TMIN, T MAX PSRR Unit 25°C 60 TMIN, T MAX 60 25°C 65 TMIN, T MAX 65 25°C 1 µA 2 µA 80 dB dB 90 dB dB 21 TMIN, T MAX 25 mA 25 mA RIN (diff) RIN (Differential) Open-Loop 25°C 15 CIN (diff) CIN (Differential) Open-Loop 25°C 1 pF RIN (cm) RIN (Common-Mode) 25°C 1 MΩ CIN (cm) CIN (Common-Mode) 25°C 1 pF ROUT Output Resistance 25°C 20 mΩ CMIR Common-Mode Input Range IOUT VOUT VOUT 100 VOUT 50 AVOL 100 Output Current Output Voltage Swing Output Voltage Swing Output Voltage Swing Open-Loop Gain No Load 100Ω 50Ω 100Ω 2 25°C ±3 TMIN, T MAX ±2.5 25°C 50 TMIN, T MAX 50 25°C ±3.5 TMIN, T MAX ±3.5 25°C ±3 TMIN, T MAX ±3 25°C ±3 TMIN, T MAX ±2.5 25°C 500 TMIN, T MAX 400 ±3.5 kΩ V V 70 mA mA ±4 V V ±3.6 V V ±3.4 1000 V V/V V/V Open Loop DC Electrical Characteristics (Continued) VS = ±5V, RL = 100Ω, unless otherwise specified Parameter Description AVOL 50 Open-Loop Gain Test Conditions Temp Min Typ 25°C 400 800 TMIN, TMAX 300 50Ω Max Unit V/V V/V eN@ > 1MHz Noise Voltage 1–100MHz 25°C 2.3 nV/√Hz iN@ > 100kHz Noise Current 100k–100MHz 25°C 3.2 pA/√Hz 1. Measured from T MIN, TMAX. 2. ±VCC = ±4.5V to 5.5V. 3. ±VIN = ±2.5V, V OUT = 0V Closed Loop AC Electrical Characteristics VS = ±5V, AV = +1, Rf = 0Ω, RL = 100Ω unless otherwise specified Parameter SSBW Description -3dB Bandwidth (VOUT = 0.4VPP) Temp Min Typ AV = +1 Test Conditions 25°C 150 300 MHz AV = -1 25°C 200 MHz AV = +2 25°C 150 TMIN, TMAX 125 200 25°C 40 MHz AV = +10 25°C 20 MHz 25°C 200 MHz MHz AV = +10 LSBWa -3dB Bandwidth VOUT = 2VPP  All 50 85 LSBWb -3dB Bandwidth VOUT = 5VPP  All 11 16 GFPL Peaking (<50MHz) VOUT = 0.4VPP 25°C 0 TMIN, TMAX VOUT = 0.4VPP 25°C 1 TMIN, TMAX GFR Rolloff (<100MHz) MHz AV = +5 Gain-Bandwidth Product Peaking (>50MHz) Unit MHz GBWP GFPH Max VOUT = 0.4VPP 25°C 0.1 TMIN, TMAX MHz 0.5 dB 0.5 dB 3 dB 3 dB 0.5 dB 0.5 dB 1.8 ° LPD Linear Phase Deviation (<100MHz) VOUT = 0.4VPP All 1 PM Phase Margin AV = +1 25°C 60 ° tr1, tf1 Rise Time, Fall Time 0.4V Step, AV = +2 25°C 2 ns tr2, tf2 Rise Time, Fall Time 5V Step, AV = +2 25°C 15 ns ts1 Settling to 0.1% (AV = -1) 2V Step 25°C 13 ns ns ts2 Settling to 0.01% (AV = -1) 2V Step 25°C 25 OS Overshoot 2V Step 25°C 5 % SR Slew Rate 2V Step All 250 V/µs 175 DISTORTION  HD2a 2nd Harmonic Distortion @ 10MHz, A V = +2 25°C -65 -55 dBc HD2b 2nd Harmonic Distortion @ 20MHz, A V = +1 25°C -60 -50 dBc HD2c 2nd Harmonic Distortion @ 20MHz, A V = +2 25°C -55 -50 dBc -45 dBc TMIN, TMAX HD3a 3rd Harmonic Distortion @ 10MHz, A V = +2 25°C -72 -60 dBc HD3b 3rd Harmonic Distortion @ 20MHz, A V = +1 25°C -70 -55 dBc HD3c 3rd Harmonic Distortion @ 20MHz, A V = +2 25°C -70 -60 dBc -60 dBc TMIN, TMAX 3 EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier Closed Loop AC Electrical Characteristics VS = ±5V, AV = +1, Rf = 0Ω, RL = 100Ω unless otherwise specified Parameter Description Test Conditions Temp Min Typ Max Unit %pp VIDEO PERFORMANCE  dG Differential Gain NTSC 25°C 0.01 0.05 dP Differential Phase NTSC 25°C 0.015 0.05 dG Differential Gain 30MHz 25°C 0.1 dP Differential Phase 30MHz 25°C VBW ±0.1dB Bandwidth Flatness 25°C 25 °pp %pp 0.1 °pp 50 MHz 1. Large-signal bandwidth calculated using LSBW = Slew Rate / 2π VPEAK. 2. All distortion measurements are made with VOUT = 2VPP, RL = 100Ω 3. Video performance measured at AV = +1 with 2 times normal video level across RL = 100Ω. This corresponds to standard video levels across a backterminated 50Ω load, i.e., 0–100 IRE, 40IREpp giving a 1VPP video signal across the 50Ω load. For other values of RL, see curves. 4 Typical Performance Curves Non-Inverting Frequency Response Inverting Frequency Response Frequency Response for Various RLs Open Loop Gain and Phase Output Voltage Swing vs Frequency Equivalent Input Noise PSRR, CMRR, and Closed-Loop RO vs Frequency 2nd and 3rd Harmonic Distortion vs Frequency 2-Tone, 3rd Order Intermodulation Intercept 5 EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier Series Resistor and Resulting Bandwidth vs Capacitive Load Common-Mode Rejection Ratio vs Input Common-Mode Voltage Bias and Offset Current vs Temperature Settling Time vs Output Voltage Change Settling Time vs Closed-Loop Gain Bias and Offset Current vs Input Common-Mode Voltage Supply Current vs Temperature Offset Voltage vs Temperature AVOL, PSRR, and CMRR vs Temperature 6 Small Signal Transient Response Differential Gain and Phase vs DC Input Offset at 3.58MHz Differential Gain and Phase vs Number of 150Ω Loads at 3.58MHz Large Signal Transient Response Differential Gain and Phase vs DC Input Offset at 4.43MHz Differential Gain and Phase vs DC Input Offset at 30MHz Differential Gain and Phase vs Number of 150Ω Loads at 4.43MHz Differential Gain and Phase vs Number of 150Ω Loads at 30MHz 7 EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier Equivalent Circuit Burn-In Circuit All Packages Use The Same Schematic 8 Applications Information Product Description ential 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, 4.43MHz for PAL, or 30MHz for HDTV. 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. The EL2073C is a wideband monolithic operational amplifier built on a high-speed complementary bipolar process. The EL2073C uses a classical voltage-feedback topology which allows it to be used in a variety of applications where current-feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. The conventional topology of the EL2073C 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 EL2073C is an excellent choice for applications such as log amplifiers. 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 EL2073C also has excellent DC specifications: 200µV, VOS, 2µA IB, 0.1µA IOS, and 90dB of CMRR. These specifications allow the EL2073C to be used in DC-sensitive applications such as difference amplifiers. Furthermore, the current noise of the EL2073C is only 3.2 pA/Hz, making it an excellent choice for high-sensitivity transimpedance amplifier configurations. The EL2073C has been designed to be among the best video amplifiers in the marketplace today. It has been thoroughly characterized for video performance in the topology described above, and the results have been included as minimum dG and dP specifications and as typical performance curves. In a gain of +2, driving 150Ω, with standard video test levels at the input, the EL2073C exhibits dG and dP of only 0.01% and 0.015° at NTSC and PAL. Because dG and dP vary with different DC offsets, the superior video performance of the EL2073C 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 The EL2073C has a gain-bandwidth product of 200MHz. 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 EL2073C has a -3dB bandwidth of 400MHz at a gain of +1, dropping to 200MHz at a gain of +2. It is important to note that the EL2073C 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 EL2073C in a gain of +1 only exhibits 1dB of peaking with a 100Ω load. The excellent output drive capability of the EL2073C allows it to drive up to 4 back-terminated loads with excellent video performance. With 4 150Ω loads, dG and dP are only 0.15% and 0.08° at NTSC and PAL. For more information, refer to the curves for Video Performance vs Number of 150Ω Loads. Output Drive Capability Video Performance The EL2073C has been optimized to drive 50Ω and 75Ω loads. It can easily drive 6VPP into a 50Ω load. This high output drive capability makes the EL2073C an ideal choice for RF, IF and video applications. Furthermore, An industry-standard method of measuring the video distortion of a component such as the EL2073C is to measure the amount of differential gain (dG) and differ9 EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier the current drive of the EL2073C remains a minimum of 50mA at low temperatures. The EL2073C is currentlimited at the output, allowing it to withstand momentary shorts to ground. However, power dissipation with the output shorted can be in excess of the power-dissipation capabilities of the package. surface-mount components (resistors, capacitors, etc.) is also recommended. Capacitive Loads Although the EL2073C has been optimized to drive resistive loads as low as 50Ω, capacitive loads will decrease the amplifier's phase margin which may result in peaking, overshoot, and possible oscillation. For optimum AC performance, capacitive loads should be reduced as much as possible or isolated via a series output resistor. Coax lines can be driven, as long as they are terminated with their characteristic impedance. When properly terminated, the capacitance of coaxial cable will not add to the capacitive load seen by the amplifier. Capacitive loads greater than 10pF should be buffered with a series resistor (Rs) to isolate the load capacitance from the amplifier output. A curve of recommended Rs vs Cload has been included for reference. Values of Rs were chosen to maximize resulting bandwidth without peaking. Printed-Circuit Layout As with any high-frequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 1µF–10µF tantalum capacitor is recommended in parallel with a 0.01µF ceramic capacitor. All lead lengths should be as short as possible, and all bypass capacitors should be as close to the device pins as possible. Parasitic capacitances should be kept to an absolute minimum at both inputs and at the output. Resistor values should be kept under 1000Ω to 2000Ω 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 parasitic inductance. Similarly, capacitors should be low-inductance for best performance. If possible, solder the EL2073C directly to the PC board without a socket. Even high quality sockets add parasitic capacitance and inductance which can potentially degrade performance. Because of the degradation of AC performance due to parasitics, the use of 10 EL2073C Macromodel * * Connections: input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt M2073C 3 2 7 4 6 * *Input Stage * ie 37 4 1mA r6 36 37 125 r7 38 37 125 rc1 7 30 200 rc2 7 39 200 q1 30 3 36 qn q2 39 2 38 qna ediff 33 0 39 30 1 rdiff 33 0 1Meg * * Compensation Section * ga 0 34 33 0 2m rh 34 0 500K ch 34 0 1.2pF rc 34 40 400 cc 40 0 0.3pF * * Poles * ep 41 0 40 0 1 rpa 41 42 75 cpa 42 0 0.5pF rpb 42 43 50 cpb 43 0 0.5pF * * Output Stage * ios1 7 50 3.0mA ios2 51 4 3.0mA q3 4 43 50 qp q4 7 43 51 qn q5 7 50 52 qn q6 4 51 53 qp ros1 52 6 2 ros2 6 53 2 * Power Supply Current * ips 7 4 11.4mA * Models * .model qna npn(is800e-18 bf170 tf0.2ns) .model qn npn(is810e-18 bf200 tf0.2ns) .model qp pnp(is800e-18 bf200 tf0.2ns) .ends 11 EL2073C EL2073C 200MHz Unity-Gain Stable Operational Amplifier EL2073C EL2073C 200MHz 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 12 Printed in U.S.A.