EL2180, EL2280, EL2480 ® Data Sheet November 14,2002 250MHz/3mA Current Mode Feedback Amplifiers The EL2180, EL2280, and EL2480 are single, dual, and quad currentfeedback operational amplifiers which achieve a -3dB bandwidth of 250MHz at a gain of +1 while consuming only 3mA of supply current per amplifier. They will operate with dual supplies ranging from ±1.5V to ±6V, or from single supplies ranging from +3V to +12V. In spite of their low supply current, the EL2480 and the EL2280 can output 55mA while swinging to ±4V on ±5V supplies. The EL2180 can output 100mA with similar output swings. These attributes make the EL2180, EL2280, and EL2480 excellent choices for low power and/or low voltage cable-driver, HDSL, or RGB applications. For applications where board space is extremely critical, the EL2180 is available in the tiny 5-pin SOT-23 package, which has a footprint 28% the size of an 8-pin SO. For single, dual, and triple applications with disable, consider the EL2186 (8-pin single), EL2286 (14-pin dual), or EL2386 (16-pin triple). For lower power applications where speed is still a concern, consider the EL2170/EL2176 family which also comes in similar single, dual, and quad configurations. The EL2170/EL2176 family provides a -3dB bandwidth of 70MHz while consuming 1mA of supply current per amplifier. PACKAGE Features • Single (EL2180), dual (EL2280), and quad (EL2480) topologies • 3mA supply current (per amplifier) • 250MHz -3dB bandwidth • Tiny SOT23-5 package (EL2180) • Low cost • Single- and dual-supply operation down to ±1.5V • 0.05%/0.05° diff. gain/diff. phase into 150Ω • 1200V/µs slew rate • Large output drive current - 100mA (EL2180), 55mA (EL2280), 55mA (EL2480) • Also available with disable in single (EL2186), dual (EL2286), and triple (EL2386) • Lower power EL2170/EL2176 family available (1mA/70MHz) in single, dual, and quad Applications • Low power/battery applications • HDSL amplifiers • Video amplifiers • Cable drivers Ordering Information PART NUMBER FN7055 TAPE & REEL PKG. NO. • RGB amplifiers EL2180CN 8-Pin PDIP - MDP0031 • Test equipment amplifiers EL2180CS 8-Pin SO - MDP0027 • Current to voltage converters EL2180CS-T7 8-Pin SO 7” MDP0027 EL2180CS-T13 8-Pin SO 13” MDP0027 EL2180CW-T7 5-Pin SOT-23* 7” MDP0038 EL2180CW-T13 5-Pin SOT-23* 13” MDP0038 EL2280CN 8-Pin PDIP - MDP0031 EL2280CS 8-Pin SO - MDP0027 EL2280CS-T7 8-Pin SO 7” MDP0027 EL2280CS-T13 8-Pin SO 13” MDP0027 EL2480CN 14-Pin PDIP - MDP0031 EL2480CS 14-Pin SO - MDP0027 EL2480CS-T7 14-Pin SO 7” MDP0027 EL2480CS-T13 14-Pin SO 13” MDP0027 NOTE: *EL2180CW symbol is .Cxxx where xxx represents date code 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners. EL2180, EL2280, EL2480 Pinouts EL2180 (8-PIN SO, PDIP) TOP VIEW EL2280 (8-PIN SO, PDIP) TOP VIEW EL2180 (5-PIN SOT 23) TOP VIEW EL2480 (14-PIN SO, PDIP) TOP VIEW 2 EL2180, EL2280, EL2480 Absolute Maximum Ratings (TA = 25°C) Supply Voltage between VS+ and GND. . . . . . . . . . . . . . . . . +12.6V Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . . . . +12.6V Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . VS- to VS+ Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±6V Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±7.5mA Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Ambient Temperature Range . . . . . . . . . .-40°C to +85°C Operating Junction Temperature Plastic Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C Output Current (EL2180) . . . . . . . . . . . . . . . . . . . . . . . . . . . ±120mA Output Current (EL2280) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60mA Output Current (EL2480) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60mA Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C 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. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical 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 Specifications PARAMETER VS = ±5V, RL = 150Ω, TA = 25°C unless otherwise specified DESCRIPTION CONDITIONS MIN TYP MAX UNIT 2.5 10 mV VOS Input Offset Voltage TCVOS Average Input Offset Voltage Drift Measured from TMIN to TMAX dVOS VOS Matching EL2280, EL2480 only +IIN +Input Current d+IIN +IIN Matching -IIN -Input Current d-IIN -IIN Matching EL2280, EL2480 only CMRR Common Mode Rejection Ratio VCM = ±3.5V -ICMR -Input Current Common Mode Rejection VCM = ±3.5V PSRR Power Supply Rejection Ratio VS is moved from ±4V to ±6V -IPSR - Input Current Power Supply Rejection VS is moved from ±4V to ±6V ROL Transimpedance VOUT = ±2.5V 120 300 kΩ +RIN +Input Resistance VCM = ±3.5V 0.5 2 MΩ +CIN +Input Capacitance 1.2 pF CMIR Common Mode Input Range ±3.5 ±4.0 V VO Output Voltage Swing ±3.5 ±4.0 V VS = 5 single-supply, high 4.0 V VS = 5 single-supply, low 0.3 V IO IS Output Current Supply Current 3 5 µV/°C 0.5 mV 1.5 EL2280, EL2480 only 20 16 VS = ±5 15 45 nA 40 µA 2 µA 50 dB 5 60 µA 30 70 1 µA/V dB 15 µA/V EL2180 only 80 100 mA EL2280 only, per amplifier 50 55 mA EL2480 only, per amplifier 50 55 mA Per amplifier 3 6 mA EL2180, EL2280, EL2480 AC Electrical Specifications VS = ±5V, RF = RG = 750Ω for PDIP and SO packages, RF = RG = 560Ω for SOT23-5 package, RL = 150Ω, TA = 25°C unless otherwise specified PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT -3dB BW -3dB Bandwidth AV = 1 250 MHz -3dB BW -3dB Bandwidth AV = 2 180 MHz 0.1dB BW 0.1dB Bandwidth AV = 2 50 MHz SR Slew Rate VOUT = ±2.5V, AV = 2 1200 V/µs tR, tF Rise and Fall Time VOUT = ±500mV 1.5 ns tPD Propagation Delay VOUT = ±500mV 1.5 ns OS Overshoot VOUT = ±500mV 3.0 % tS 0.1% Settling VOUT = ±2.5V, AV = -1 15 ns dG Differential Gain AV = 2, RL = 150Ω (Note 1) 0.05 % dP Differential Phase AV = 2, RL = 150Ω (Note 1) 0.05 ° dG Differential Gain AV = 1, RL = 500Ω (Note 1) 0.01 % dP Differential Phase AV = 1, RL = 500Ω (Note 1) 0.01 ° CS Channel Separation EL2280, EL2480 only, f = 5MHz 85 dB NOTE: 1. DC offset from 0V to 0.714V, AC amplitude 286mVP-P, f = 3.58MHz 4 600 EL2180, EL2280, EL2480 Test Circuit (per Amplifier) Simplified Schematic (per Amplifier) 5 EL2180, EL2280, EL2480 Typical Performance Curves Non-Inverting Frequency Response (Gain) (PDIP and SO Packages) Non–Inverting Frequency Response (Phase) (PDIP and SO Packages) Inverting Frequency Response (Gain) (PDIP and SO Packages) Inverting Frequency Response (Phase) (PDIP and SO Packages) Frequency Response for Various RF and RG (PDIP and SO Packages) Frequency Response for Various RL and CL (PDIP and SO Packages) Ω Transimpedance (ROL) vs Frequency 6 PSRR and CMRR vs Frequency Frequency Response for Various CIN- EL2180, EL2280, EL2480 Typical Performance Curves (Continued) Voltage and Current Noise vs Frequency 2nd and 3rd Harmonic Distortion vs Frequency Output Voltage Swing vs Frequency -3dB Bandwidth and Peaking vs Supply Voltage for Various Non-Inverting Gains -3dB Bandwidth and Peaking vs Supply Voltage for Various Inverting Gains Output Voltage Swing vs Supply Voltage Supply Current vs Supply Voltage Common-Mode Input Range vs Supply Voltage Slew Rate vs Supply Voltage 7 EL2180, EL2280, EL2480 Typical Performance Curves (Continued) Input Bias Current vs Die Temperature Short-Circuit Current vs Die Temperature Transimpedance (ROL) vs Die Temperature -3dB Bandwidth and Peaking vs Die Temperature for Various Non-Inverting Gains -3dB Bandwidth vs Die Temperature for Various Inverting Gains Input Offset Voltage vs Die Temperature Supply Current vs Die Temperature Input Voltage Range vs Die Temperature Slew Rate vs Die Temperature 8 EL2180, EL2280, EL2480 Typical Performance Curves (Continued) Differential Gain and Phase vs DC Input Voltage at 3.58MHz Small-Signal Step Response 5-Pin Plastic SOT-23 Maximum Power Dissipation vs Ambient Temperature 9 Differential Gain and Phase vs DC Input Voltage at 3.58MHz Settling Time vs Settling Accuracy Large-Signal Step Response 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 8-Pin SO Maximum Power Dissipation vs Ambient Temperature EL2180, EL2280, EL2480 Typical Performance Curves (Continued) 14-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature Non-Inverting Frequency Response (Gain) (SOT23-5 Package) Inverting Frequency Response (Gain) (SOT23-5 Package) 10 14-Pin SO Maximum Power Dissipation vs Ambient Temperature Non-Inverting Frequency Response (Phase) (SOT23-5 Package) Channel Separation vs Frequency Frequency Response for Various RF and RG (SOT23-5 Package) Inverting Frequency Response (Phase) (SOT23-5 Package) EL2180, EL2280, EL2480 Applications Information Product Description The EL2180, EL2280, and EL2480 are current-feedback operational amplifiers that offer a wide -3dB bandwidth of 250MHz and a low supply current of 3mA per amplifier. All of these products also feature high output current drive. The EL2180 can output 100mA, while the EL2280 and the EL2480 can output 55mA per amplifier. The EL2180, EL2280, and EL2480 work with supply voltages ranging from a single 3V to ±6V, and they are also capable of swinging to within 1V of either supply on the input and the output. Because of their current-feedback topology, the EL2180, EL2280, and EL2480 do not have the normal gainbandwidth product associated with voltage-feedback operational amplifiers. This allows their -3dB bandwidth to remain relatively constant as closed-loop gain is increased. This combination of high bandwidth and low power, together with aggressive pricing make the EL2180, EL2280, and EL2480 the ideal choice for many low-power/high-bandwidth applications such as portable computing, HDSL, and video processing. For applications where board space is extremely critical, the EL2180 is available in the tiny 5-pin SOT-23 package, which has a footprint 28% the size of an 8-pin SO. The EL2180, EL2280, and EL2480 are each also available in industry standard pinouts in PDIP and SO packages. For single, dual and triple applications with disable, consider the EL2186 (8-pin single), EL2286 (14-pin dual) and EL2386 (16-pin triple). If lower power is required, refer to the EL2170/EL2176 family which provides singles, duals, and quads with 70MHz of bandwidth while consuming 1mA of supply current per amplifier. Power Supply Bypassing and Printed Circuit Board Layout As with any high-frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible. The power supply pins must be well bypassed to reduce the risk of oscillation. The combination of a 4.7µF tantalum capacitor in parallel with a 0.1µF capacitor has been shown to work well when placed at each supply pin. For good AC performance, parasitic capacitance should be kept to a minimum especially at the inverting input (see the Capacitance at the Inverting Input section). Ground plane construction should be used, but it should be removed from the area near the inverting input to minimize any stray capacitance at that node. Carbon or Metal-Film resistors are acceptable with the Metal-Film resistors giving slightly less peaking and bandwidth because of their additional series inductance. Use of sockets, particularly for the SO package, should be avoided if possible. Sockets add parasitic 11 inductance and capacitance which will result in some additional peaking and overshoot. Capacitance at the Inverting Input Any manufacturer's high-speed voltage- or current-feedback amplifier can be affected by stray capacitance at the inverting input. For inverting gains this parasitic capacitance has little effect because the inverting input is a virtual ground, but for non-inverting gains this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifier. This pole, if low enough in frequency, has the same destabilizing effect as a zero in the forward open-loop response. The use of large value feedback and gain resistors further exacerbates the problem by further lowering the pole frequency. The experienced user with a large amount of PC board layout experience may find in rare cases that the EL2180, EL2280, and EL2480 have less bandwidth than expected. The reduction of feedback resistor values (or the addition of a very small amount of external capacitance at the inverting input, e.g. 0.5pF) will increase bandwidth as desired. Please see the curves for Frequency Response for Various RF and RG, and Frequency Response for Various CIN-. Feedback Resistor Values The EL2180, EL2280, and EL2480 have been designed and specified at gains of +1 and +2 with RF = 750Ω in PDIP and SO packages and RF = 560Ω in SOT23-5 package. These values of feedback resistors give 250MHz of -3dB bandwidth at AV = +1 with about 2.5dB of peaking, and 180MHz of -3dB bandwidth at AV = +2 with about 0.1dB of peaking. The SOT23-5 package is characterized with a smaller value of feedback resistor, for a given bandwidth, to compensate for lower parasitics within both the package itself and the printed circuit board where it will be placed. Since the EL2180, EL2280, and EL2480 are current-feedback amplifiers, it is also possible to change the value of RF to get more bandwidth. As seen in the curve of Frequency Response For Various RF and RG, bandwidth and peaking can be easily modified by varying the value of the feedback resistor. Because the EL2180, EL2280, and EL2480 are currentfeedback amplifiers, their gain-bandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL2180, EL2280, and EL2480 to maintain about the same -3dB bandwidth, regardless of closed-loop gain. However, as closed-loop gain is increased, bandwidth decreases slightly while stability increases. Since the loop stability is improving with higher closed-loop gains, it becomes possible to reduce the value of RF below the specified 560Ω and 750Ω and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain. EL2180, EL2280, EL2480 Supply Voltage Range and Single-Supply Operation minimum output drive of each EL2280 and EL2480 amplifier allows swings of ±2.5V into 50Ω loads. The EL2180, EL2280, and EL2480 have been designed to operate with supply voltages having a span of greater than 3V, and less than 12V. In practical terms, this means that the EL2180, EL2280, and EL2480 will operate on dual supplies ranging from ±1.5V to ±6V. With a single-supply, the EL2180, EL2280, and EL2480 will operate from +3V to +12V. Driving Cables and Capacitive Loads As supply voltages continue to decrease, it becomes necessary to provide input and output voltage ranges that can get as close as possible to the supply voltages. The EL2180, EL2280, and EL2480 have an input voltage range that extends to within 1V of either supply. So, for example, on a single +5V supply, the EL2180, EL2280, and EL2480 have an input range which spans from 1V to 4V. The output range of the EL2180, EL2280, and EL2480 is also quite large, extending to within 1V of the supply rail. On a ±5V supply, the output is therefore capable of swinging from -4V to +4V. Single-supply output range is even larger because of the increased negative swing due to the external pull-down resistor to ground. On a single +5V supply, output voltage range is about 0.3V to 4V. Video Performance For good video performance, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This is especially difficult when driving a standard video load of 150Ω, because of the change in output current with DC level. Until the EL2180, EL2280, and EL2480, good Differential Gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output impedance). These currents were typically comparable to the entire 3mA supply current of each EL2180, EL2280, and EL2480 amplifier! Special circuitry has been incorporated in the EL2180, EL2280, and EL2480 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.05% and 0.05° while driving 150Ω at a gain of +2. Video performance has also been measured with a 500Ω load at a gain of +1. Under these conditions, the EL2180, EL2280, and EL2480 have dG and dP specifications of 0.01% and 0.01° respectively while driving 500Ω at AV = +1. Output Drive Capability In spite of its low 3mA of supply current, the EL2180 is capable of providing a minimum of ±80mA of output current. Similarly, each amplifier of the EL2280 and the EL2480 is capable of providing a minimum of ±50mA. These output drive levels are unprecedented in amplifiers running at these supply currents. With a minimum ±80mA of output drive, the EL2180 is capable of driving 50Ω loads to ±4V, making it an excellent choice for driving isolation transformers in telecommunications applications. Similarly, the ±50mA When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back-termination series resistor will decouple the EL2180, EL2280, and EL2480 from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back-termination resistor. In these applications, a small series resistor (usually between 5Ω and 50Ω) can be placed in series with the output to eliminate most peaking. The gain resistor (RG) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output. In many cases it is also possible to simply increase the value of the feedback resistor (RF) to reduce the peaking. Current Limiting The EL2180, EL2280, and EL2480 have no internal currentlimiting circuitry. If any output is shorted, it is possible to exceed the Absolute Maximum Ratings for output current or power dissipation, potentially resulting in the destruction of the device. Power Dissipation With the high output drive capability of the EL2180, EL2280, and EL2480, it is possible to exceed the 150°C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking, when RL falls below about 25Ω, it is important to calculate the maximum junction temperature (TJMAX) for the application to determine if powersupply voltages, load conditions, or package type need to be modified for the EL2180, EL2280, and EL2480 to remain in the safe operating area. These parameters are calculated as follows [1]: T JMAX = T MAX + ( Θ JA × n × PD MAX ) where: TMAX = Maximum ambient temperature θJA = Thermal resistance of the package n = Number of amplifiers in the package PDMAX = Maximum power dissipation of each amplifier in the package PDMAX for each amplifier can be calculated as follows [2]: V OUTMAX PD MAX = ( 2 × V S × I SMAX ) + ( V S - V OUTMAX ) × ---------------------------RL where: VS = Supply voltage ISMAX = Maximum supply current of 1 amplifier VOUTMAX = Maximum output voltage of the application RL = Load resistance 12 EL2180, EL2280, EL2480 Typical Application Circuits FAST-SETTLING PRECISION AMPLIFIER INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER 120 120 DIFFERENTIAL LINE-DRIVER/RECEIVER 13 EL2180, EL2280, EL2480 EL2180/EL2280/EL2480 Macromodel * EL2180 Macromodel * Revision A, March 1995 * AC characteristics used: Rf = Rg = 750 ohms * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt EL2180/el 3 2 7 4 6 * * Input Stage * e1 10 0 3 0 1.0 vis 10 9 0V h2 9 12 vxx 1.0 r1 2 11 400 l1 11 12 25nH iinp 3 0 1.5uA iinm 2 0 3uA r12 3 0 2Meg * * Slew Rate Limiting * h1 13 0 vis 600 r2 13 14 1K d1 14 0 dclamp d2 0 14 dclamp * * High Frequency Pole * e2 30 0 14 0 0.00166666666 l3 30 17 150nH c5 17 0 0.8pF r5 17 0 165 * * Transimpedance Stage * g1 0 18 17 0 1.0 rol 18 0 450K cdp 18 0 0.675pF * * Output Stage * q1 4 18 19 qp q2 7 18 20 qn q3 7 19 21 qn q4 4 20 22 qp r7 21 6 4 r8 22 6 4 ios1 7 19 1mA ios2 20 4 1mA * * Supply Current * ips 7 4 0.2mA * * Error Terms * 14 EL2180, EL2280, EL2480 ivos 0 23 0.2mA vxx 23 0 0V e4 24 0 3 0 1.0 e5 25 0 7 0 1.0 e6 26 0 4 0 -1.0 r9 24 23 316 r10 25 23 3.2K r11 26 23 3.2K * * Models * .model qn npn(is=5e-15 bf=200 tf=0.01nS) *.model qp pnp(is=5e-15 bf=200 tf=0.01nS) .model dclamp d(is=1e-30 ibv=0.266 + bv=0.71v n=4) .ends EL2180/EL2280/EL2480 Macromodel 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 15