Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Features General Description # 100 MHz gain-bandwidth product # Gain-of-2 stable # Low supply current e 5.2 mA at VS e g 15V # Wide supply range e g 2V to g 18V dual-supply e 2.5V to 36V single-supply # High slew rate e 275 V/ms # Fast settling e 80 ns to 0.1% for a 10V step # Low differential gain e 0.02% at AV e a 2, RL e 150X # Low differential phase e 0.07§ at AV e a 2, RL e 150X # Stable with unlimited capacitive load # Wide output voltage swing e g 13.6V with VS e g 15V, RL e 1000X e 3.8V/0.3V with VS e a 5V, RL e 500X The EL2045C is a high speed, low power, low cost monolithic operational amplifier built on Elantec’s proprietary complementary bipolar process. The EL2045C is gain-of-2 stable and features a 275 V/ms slew rate and 100 MHz gain-bandwidth product while requiring only 5.2 mA of supply current. 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 Ordering Information Part No. Temp. Range Package Outline Ý EL2045CN 0§ C to a 75§ C 8-Pin P-DIP MDP0031 EL2045CS 0§ C to a 75§ C 8-Lead SO MDP0027 The power supply operating range of the EL2045C is from g 18V down to as little as g 2V. For single-supply operation, the EL2045C operates from 36V down to as little as 2.5V. The excellent power supply operating range of the EL2045C makes it an obvious choice for applications on a single a 5V or a 3V supply. The EL2045C also features an extremely wide output voltage swing of g 13.6V with VS e g 15V and RL e 1000X. At g 5V, output voltage swing is a wide g 3.8V with RL e 500X and g 3.2V with RL e 150X. Furthermore, for single-supply operation at a 5V, output voltage swing is an excellent 0.3V to 3.8V with RL e 500X. At a gain of a 2, the EL2045C has a b 3 dB bandwidth of 100 MHz with a phase margin of 50§ . It can drive unlimited load capacitance, and because of its conventional voltage-feedback topology, the EL2045C allows the use of reactive or nonlinear elements in its feedback network. This versatility combined with low cost and 75 mA of output-current drive makes the EL2045C an ideal choice for price-sensitive applications requiring low power and high speed. Connection Diagram DIP and SO Package 2045 – 1 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. © 1992 Elantec, Inc. December 1995 Rev C # # # # # # # # # # # EL2045C EL2045C EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Absolute Maximum Ratings (TA e 25§ C) Supply Voltage (VS) Peak Output Current (IOP) Output Short-Circuit Duration (Note 1) Input Voltage (VIN) Differential Input Voltage (dVIN) Power Dissipation (PD) Operating Temperature Range (TA) Operating Junction Temperature (TJ) Storage Temperature (TST) g 18V or 36V Short-Circuit Protected Infinite g VS g 10V See Curves 0§ C to a 75§ C 150§ C b 65§ C to a 150§ C Important Note: All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually performed during production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test equipment, specifically the LTX77 Series system. Unless otherwise noted, all tests are pulsed tests, therefore TJ e TC e TA. Test Level I II III IV V Test Procedure 100% production tested and QA sample tested per QA test plan QCX0002. 100% production tested at TA e 25§ C and QA sample tested at TA e 25§ C , TMAX and TMIN per QA test plan QCX0002. QA sample tested per QA test plan QCX0002. Parameter is guaranteed (but not tested) by Design and Characterization Data. Parameter is typical value at TA e 25§ C for information purposes only. DC Electrical Characteristics VS e g 15V, RL e 1000X, unless otherwise specified Description Condition Input Offset Voltage VS e g 15V TCVOS Average Offset Voltage Drift (Note 2) IB Input Bias Current VS e g 15V IOS Input Offset Current Temp Min Typ Max Test Level Units 25§ C 0.5 TMIN, TMAX All 10.0 25§ C 2.8 TMIN, TMAX VS e g 5V 25§ C 2.8 VS e g 15V 25§ C 50 TMIN, TMAX VS e g 5V TCIOS Average Offset Current Drift (Note 2) AVOL Open-Loop Gain VS e g 15V,VOUT e g 10V, RL e 1000X Power Supply Rejection Ratio I mV III mV V mV/§ C 8.2 I mA 9.2 III mA V mA 300 I nA 400 III nA 25§ C 50 V nA All 0.3 V nA/§ C I V/V 25§ C 1500 3000 TMIN, TMAX 1500 PSRR 7.0 9.0 III V/V VS e g 5V, VOUT e g 2.5V, RL e 500X 25§ C 2500 V V/V VS e g 5V, VOUT e g 2.5V, RL e 150X 25§ C 1750 V V/V VS e g 5V to g 15V 2 25§ C 65 TMIN, TMAX 60 85 I dB III dB TD is 3.5in Parameter VOS EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Parameter CMRR CMIR VOUT ISC IS Description Condition Temp Min Typ 25§ C 70 95 TMIN, TMAX 70 Common-Mode Rejection Ratio VCM e g 12V, VOUT e 0V Common-Mode Input Range VS e g 15V 25§ C VS e g 5V VS e a 5V VS e g 15V, RL e 1000X 25§ C Output Voltage Swing I dB dB g 14.0 V V 25§ C g 4.2 V V 25§ C 4.2/0.1 V V g 13.6 I V g 13.4 TMIN, TMAX g 13.1 III V 25§ C g 12.0 g 13.4 I V VS e g 5V, RL e 500X 25§ C g 3.4 g 3.8 IV V VS e g 5V, RL e 150X 25§ C g 3.2 V V VS e a 5V, RL e 500X 25§ C 3.6/0.4 3.8/0.3 I V TMIN, TMAX 3.5/0.5 25§ C 40 TMIN, TMAX 35 CIN Input Capacitance III V I mA III mA 75 25§ C VS e g 15V, No Load VS e g 5V, No Load Input Resistance Units III 5.2 TMIN, TMAX RIN Test Level VS e g 15V, RL e 500X Output Short Circuit Current Supply Current Max 25§ C 5.0 7 I mA 7.6 III mA V mA Differential 25§ C 150 V kX Common-Mode 25§ C 15 V MX AV e a 2 @ 10 MHz 25§ C 1.0 V pF ROUT Output Resistance AV e a 2 25§ C V mX PSOR Power-Supply Operating Range Dual-Supply 25§ C g 2.0 g 18.0 V V Single-Supply 25§ C 2.5 36.0 V V 50 TD is 4.5in DC Electrical Characteristics VS e g 15V, RL e 1000X, unless otherwise specified Ð Contd. Closed-Loop AC Electrical Characteristics Parameter BW GBWP PM Description b 3 dB Bandwidth (VOUT e 0.4 VPP) Gain-Bandwidth Product Phase Margin Condition Temp Min Typ Max Test Level Units VS e g 15V, AV e a 2 25§ C 100 V MHz VS e g 15V, AV e b1 25§ C 75 V MHz VS e g 15V, AV e a 5 25§ C 20 V MHz VS e g 15V, AV e a 10 25§ C 10 V MHz VS e g 15V, AV e a 20 25§ C 5 V MHz VS e g 5V, AV e a 2 25§ C 75 V MHz VS e g 15V 25§ C 100 V MHz VS e g 5V 25§ C 75 V MHz RL e 1 kX, CL e 10 pF 25§ C 50 V § 3 TD is 1.9in VS e g 15V, AV e a 2, Rf e Rg e 1 kX, Cf e 3 pF, RL e 1000X unless otherwise specified EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Closed-Loop AC Electrical Characteristics Parameter SR FPBW Description Slew Rate (Note 3) Full-Power Bandwidth (Note 4) Condition Temp Min Typ Test Level Units VS e g 15V, RL e 1000X 25§ C 200 275 I V/ms VS e g 5V, RL e 500X 25§ C 200 V V/ms VS e g 15V 25§ C 4.4 I MHz VS e g 5V 25§ C 12.7 V MHz 3.2 Max tr, tf Rise Time, Fall Time 0.1V Output Step 25§ C 3.0 V ns OS Overshoot 0.1V Output Step 25§ C 20 V % tPD Propagation Delay 25§ C 2.5 V ns ts Settling to a 0.1% (AV e a 2) VS e g 15V, 10V Step 25§ C 80 V ns VS e g 5V, 5V Step 25§ C 60 V ns dG Differential Gain (Note 5) NTSC/PAL 25§ C 0.02 V % dP Differential Phase (Note 5) NTSC/PAL 25§ C 0.07 V § eN Input Noise Voltage 10 kHz 25§ C 15.0 V nV/0Hz iN Input Noise Current 10 kHz 25§ C 1.50 V pA/0Hz CI STAB Load Capacitance Stability AV e a 2 25§ C Infinite V pF Note Note Note Note 1: A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted. 2: Measured from TMIN to TMAX. 3: Slew rate is measured on rising edge. 4: For VS e g 15V, VOUT e 20 VPP. For VS e g 5V, VOUT e 5 VPP. Full-power bandwidth is based on slew rate measurement using: FPBW e SR/(2q * Vpeak). Note 5: Video Performance measured at VS e g 15V, AV e a 2 with 2 times normal video level across RL e 150X. This corresponds to standard video levels across a back-terminated 75X load. For other values of RL, see curves. EL2045C Test Circuit 2045 – 2 4 TD is 2.8in VS e g 15V, AV e a 2, Rf e Rg e 1 kX, Cf e 3 pF, RL e 1000X, unless otherwise specified Ð Contd. EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Typical Performance Curves (TA e 25§ C, Rf e 1 kX, Cf e 3 pF, RL e 1000X, AV e a 2 unless otherwise specified) 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 CMRR, PSRR and Closed-Loop Output Resistance vs Frequency 2nd and 3rd Harmonic Distortion vs Frequency Settling Time vs Output Voltage Change Supply Current vs Supply Voltage Common-Mode Input Range vs Supply Voltage Output Voltage Range vs Supply Voltage 2045 – 3 5 EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Typical Performance Curves (TA e 25§ C, Rf e 1 kX, Cf e 3 pF, RL e 1000X, AV e a 2 unless otherwise specified) Ð Contd. 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 2045 – 4 6 EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Typical Performance Curves (TA e 25§ C, Rf e 1 kX, Cf e 3 pF, RL e 1000X, AV e a 2 unless otherwise specified) Ð Contd. Short-Circuit Current vs Temperature Gain-Bandwidth Product vs Load Capacitance Small-Signal Step Response Overshoot vs Load Capacitance 2045 – 5 Large-Signal Step Response 2045 – 6 2045 – 7 Differential Gain and Phase vs DC Input Offset at 3.58 MHz Differential Gain and Phase vs DC Input Offset at 4.43 MHz Differential Gain and Phase vs Number of 150X Loads at 3.58 MHz Differential Gain and Phase vs Number of 150X Loads at 4.43 MHz 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 8-Lead SO Maximum Power Dissipation vs Ambient Temperature 2045 – 8 7 EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Simplified Schematic 2045 – 9 8 EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier Gain-Bandwidth Product and the b 3 dB Bandwidth Burn-In Circuit The EL2045C has a gain-bandwidth product of 100 MHz while using only 5.2 mA of supply current. For gains greater than 4, its closed-loop b 3 dB bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit. For gains less than 4, higherorder poles in the amplifier’s transfer function contribute to even higher closed loop bandwidths. For example, the EL2045C has a b 3 dB bandwidth of 100 MHz at a gain of a 2, dropping to 20 MHz at a gain of a 5. It is important to note that the EL2045C 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 EL2045C in a gain of a 2 only exhibits 1.0 dB of peaking with a 1000X load. 2045 – 10 All Packages Use the Same Schematic Applications Information Product Description The EL2045C is a low-power wideband, gain-of-2 stable monolithic operational amplifier built on Elantec’s proprietary high-speed complementary bipolar process. The EL2045C 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 EL2045C 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 EL2045C 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 EL2045C is to measure the amount of differential gain (dG) and differential phase (dP) that it introduces. To make these measurements, a 0.286 VPP (40 IRE) signal is applied to the device with 0V DC offset (0 IRE) at either 3.58 MHz for NTSC or 4.43 MHz 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 EL2045C has been designed to have a wide input and output voltage range. This design also makes the EL2045C an excellent choice for single-supply operation. Using a single positive supply, the lower input voltage range is within 100 mV of ground (RL e 500X), and the lower output voltage range is within 300 mV of ground. Upper input voltage range reaches 4.2V, and output voltage range reaches 3.8V with a 5V supply and RL e 500X. 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 EL2045C still has 1V of output swing. For signal transmission and distribution, a backterminated cable (75X in series at the drive end, and 75X 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 EL2045C has been designed as an economical solution for applications requiring low video distortion. It has been thoroughly characterized 9 EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier though stable with all capacitive loads, some peaking still occurs as load capacitance increases. A series resistor at the output of the EL2045C can be used to reduce this peaking and further improve stability. Applications Information Ð Contd. 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 a 2, driving 150X, with standard video test levels at the input, the EL2045C exhibits dG and dP of only 0.02% and 0.07§ at NTSC and PAL. Because dG and dP can vary with different DC offsets, the video performance of the EL2045C has been characterized over the entire DC offset range from b 0.714V to a 0.714V. For more information, refer to the curves of dG and dP vs DC Input Offset. Printed-Circuit Layout The EL2045C 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 high-frequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1 mF ceramic capacitor is recommended for bypassing both supplies. Lead lengths should be as short as possible, and bypass capacitors should be as close to 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 5 kX 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. The output drive capability of the EL2045C 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 EL2120, EL400, or EL2074 should be considered. Output Drive Capability The EL2045C has been designed to drive low impedance loads. It can easily drive 6 VPP into a 150X load. This high output drive capability makes the EL2045C an ideal choice for RF, IF and video applications. Furthermore, the current drive of the EL2045C remains a minimum of 35 mA at low temperatures. The EL2045C 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 EL2045C Macromodel This macromodel has been developed to assist the user in simulating the EL2045C 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 low-frequency op-amps, but it is much more accurate for AC analysis. Capacitive Loads For ease of use, the EL2045C has been designed to drive any capacitive load. However, the EL2045C 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. Al- The model does not simulate these characteristics accurately: noise settling-time CMRR PSRR 10 non-linearities temperature effects manufacturing variations TD is 0.7in EL2045C EL2045C Macromodel Ð Contd. * Connections: * * * * a input l l l l l b input l l l l * .subckt M2045 3 2 * * Input stage * ie 7 37 0.9mA r6 36 37 400 r7 38 37 400 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 1.5pF rc 34 40 1K cc 40 0 1pF * * Poles * ep 41 0 40 0 1 rpa 41 42 200 cpa 42 0 2pF rpb 42 43 200 cpb 43 0 2pF * * 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 * a Vsupply l l l l l output 7 4 6 b Vsupply l * Models * .model qn npn(is e 800Eb18 bf e 200 tf e 0.2nS) .model qpa pnp(is e 864Eb18 bf e 100 tf e 0.2nS) .model qp pnp(is e 800Eb18 bf e 125 tf e 0.2nS) .ends 11 TD is 0.7in TAB WIDE Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier EL2045C EL2045C Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier EL2045C Macromodel Ð Contd. 2045 – 11 EL2045C Model 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. December 1995 Rev C WARNING Ð 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, Inc. 1996 Tarob Court Milpitas, CA 95035 Telephone: (408) 945-1323 (800) 333-6314 Fax: (408) 945-9305 European Office: 44-71-482-4596 12 Printed in U.S.A.