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EL2480
Data Sheet May 23, 2005 FN7055.1
250MHz/3mA Current Mode Feedback Amplifier
The EL2480 is a quad current-feedback operational amplifier which achieves a -3dB bandwidth of 250MHz at a gain of +1 while consuming only 3mA of supply current per amplifier. It will operate with dual supplies ranging from 1.5V to 6V, or from single supplies ranging from +3V to +12V. In spite of its low supply current, the EL2480 can output 55mA while swinging to 4V on 5V supplies. These attributes make the EL2480 an excellent choice for low power and/or low voltage cable-driver, HDSL, or RGB applications. For triple applications with disable, consider the EL2386 (16pin triple).
Features
* Quad topology * 3mA supply current (per amplifier) * 250MHz -3dB bandwidth * Low cost * Single- and dual-supply operation down to 1.5V * 0.05%/0.05 diff. gain/diff. phase into 150 * 1200V/s slew rate * Large output drive current - 55mA * Also available with disable in triple * Pb-Free plus Anneal available (RoHS compliant)
Ordering Information
PART NUMBER EL2480CS EL2480CS-T7 EL2480CS-T13 EL2480CSZ (See Note) EL2480CSZ-T7 (See Note) EL2480CSZ-T13 (See Note) PACKAGE 14-Pin SO 14-Pin SO 14-Pin SO 14-Pin SO (Pb-free) 14-Pin SO (Pb-free) 14-Pin SO (Pb-free) TAPE & REEL 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027
Applications
* Low power/battery applications * HDSL amplifiers * Video amplifiers * Cable drivers * RGB amplifiers * Test equipment amplifiers * Current to voltage converters
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Pinout
EL2480 (14-PIN SO) TOP VIEW
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EL2480
Absolute Maximum Ratings (TA = 25C)
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 . . . . . . . . . .-40C to +85C Operating Junction Temperature Plastic Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C
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 VOS TCVOS dVOS +IIN d+IIN -IIN d-IIN CMRR -ICMR PSRR -IPSR ROL +RIN +CIN CMIR VO
VS = 5V, RL = 150, TA = 25C unless otherwise specified CONDITIONS MIN TYP 2.5 Measured from TMIN to TMAX 5 0.5 1.5 20 16 2 VCM = 3.5V VCM = 3.5V VS is moved from 4V to 6V VS is moved from 4V to 6V VOUT = 2.5V VCM = 3.5V 120 0.5 60 45 50 5 70 1 300 2 1.2 3.5 VS = 5 VS = 5 single-supply, high VS = 5 single-supply, low 3.5 4.0 4.0 4.0 0.3 50 55 3 6 15 30 40 15 MAX 10 UNIT mV V/C mV A nA A A dB A/V dB A/V k M pF V V V V mA mA
DESCRIPTION Input Offset Voltage Average Input Offset Voltage Drift VOS Matching +Input Current +IIN Matching -Input Current -IIN Matching Common Mode Rejection Ratio -Input Current Common Mode Rejection Power Supply Rejection Ratio - Input Current Power Supply Rejection Transimpedance +Input Resistance +Input Capacitance Common Mode Input Range Output Voltage Swing
IO IS
Output Current Supply Current
Per amplifier Per amplifier
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EL2480
AC Electrical Specifications
PARAMETER -3dB BW -3dB BW 0.1dB BW SR tR, tF tPD OS tS dG dP dG dP CS NOTE: 1. DC offset from 0V to 0.714V, AC amplitude 286mVP-P, f = 3.58MHz VS = 5V, RF = RG = 750, RL = 150, TA = 25C unless otherwise specified CONDITIONS AV = 1 AV = 2 AV = 2 VOUT = 2.5V, AV = 2 VOUT = 500mV VOUT = 500mV VOUT = 500mV VOUT = 2.5V, AV = -1 AV = 2, RL = 150 (Note 1) AV = 2, RL = 150 (Note 1) AV = 1, RL = 500 (Note 1) AV = 1, RL = 500 (Note 1) f = 5MHz 600 MIN TYP 250 180 50 1200 1.5 1.5 3.0 15 0.05 0.05 0.01 0.01 85 MAX UNIT MHz MHz MHz V/s ns ns % ns % % dB
DESCRIPTION -3dB Bandwidth -3dB Bandwidth 0.1dB Bandwidth Slew Rate Rise and Fall Time Propagation Delay Overshoot 0.1% Settling Differential Gain Differential Phase Differential Gain Differential Phase Channel Separation
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EL2480 Test Circuit (per Amplifier)
Simplified Schematic (per Amplifier)
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EL2480 Typical Performance Curves
Non-Inverting Frequency Response (Gain)
Non-Inverting Frequency Response (Phase)
Frequency Response for Various RF and RG
Inverting Frequency Response (Gain)
Inverting Frequency Response (Phase)
Frequency Response for Various RL and CL
Transimpedance (ROL) vs Frequency
PSRR and CMRR vs Frequency
Frequency Response for Various CIN-
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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
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EL2480 Typical Performance Curves
Input Bias Current vs Die Temperature
(Continued)
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
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EL2480 Typical Performance Curves
Differential Gain and Phase vs DC Input Voltage at 3.58MHz
(Continued)
Differential Gain and Phase vs DC Input Voltage at 3.58MHz
Settling Time vs Settling Accuracy
Channel Separation vs Frequency
Small-Signal Step Response
Large-Signal Step Response
1.8 POWER DISSIPATION (W)
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD POWER DISSIPATION (W)
1.2 1 0.8 0.6 0.4 0.2 0
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.042W SO14 JA=120C/W
1.6 1.420W 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 25 50
SO14 JA=88C/W
75 85 100
125
150
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
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EL2480 Applications Information
Product Description
The EL2480 is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 250MHz and a low supply current of 3mA per amplifier. This product also features high output current drive. The EL2480 can output 55mA per amplifier. The EL2480 works with supply voltages ranging from a single 3V to 6V, and it is also capable of swinging to within 1V of either supply on the input and the output. Because of its current-feedback topology, the EL2480 does not have the normal gain-bandwidth product associated with voltage-feedback operational amplifiers. This allows its -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 EL2480 the ideal choice for many low-power/high-bandwidth applications such as portable computing, HDSL, and video processing. The EL2480 is available in the industry standard SO package. For triple application with disable, consider the EL2386 (16-pin triple). 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 EL2480 has 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 EL2480 has been designed and specified at gains of +1 and +2 with RF = 750. 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. Since the EL2480 is currentfeedback amplifier, 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 EL2480 is current-feedback amplifier, its gainbandwidth product is not a constant for different closed-loop gains. This feature actually allows the 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 560 and 750 and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain.
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 4.7F tantalum capacitor in parallel with a 0.1F 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, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in some additional peaking and overshoot.
Supply Voltage Range and Single-Supply Operation
The EL2480 has 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 EL2480 will operate on dual supplies ranging from 1.5V to 6V. With a single-supply, the EL2480 will operate from +3V to +12V. 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 EL2480 has an input voltage range that extends to within 1V of either supply. So, for example, on a single +5V supply, the EL2480 has an input range which spans from 1V to 4V. The output range of the 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.
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
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EL2480
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 150, because of the change in output current with DC level. Until the 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 EL2480 amplifier! Special circuitry has been incorporated in the 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 150 at a gain of +2. Video performance has also been measured with a 500 load at a gain of +1. Under these conditions, the EL2480 has dG and dP specifications of 0.01% and 0.01 respectively while driving 500 at AV = +1. modified for the EL2480 to remain in the safe operating area. These parameters are calculated as follows:
T JMAX = T MAX + ( JA x n x PD MAX )
where: TMAX = Maximum ambient temperature JA = 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:
V OUTMAX PD MAX = ( 2 x V S x I SMAX ) + ( V S - V OUTMAX ) x --------------------------R
L
where: VS = Supply voltage ISMAX = Maximum supply current of 1 amplifier VOUTMAX = Maximum output voltage of the application RL = Load resistance
Output Drive Capability
This amplifier of the EL2480 is capable of providing a minimum of 50mA. These output drive levels are unprecedented in amplifiers running at these supply currents. The 50mA minimum output drive of the EL2480 amplifier allows swings of 2.5V into 50 loads.
Driving Cables and Capacitive Loads
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 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 5 and 50) 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 EL2480 has no internal current-limiting 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 EL2480, it is possible to exceed the 150C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking, when RL falls below about 25, it is important to calculate the maximum junction temperature (TJMAX) for the application to determine if power-supply voltages, load conditions, or package type need to be
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EL2480 Typical Application Circuits
EL2480
EL2480
INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER
FAST-SETTLING PRECISION AMPLIFIER
120
120
DIFFERENTIAL LINE-DRIVER/RECEIVER
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EL2480 EL2480 Macromodel
* EL2480 Macromodel * Revision A, March 1995 * AC characteristics used: Rf = Rg = 750 * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt EL2480/el 3 2 4 11 1 * * 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 11 18 19 qp q2 4 18 20 qn q3 4 19 21 qn q4 11 20 22 qp r7 21 1 4 r8 22 1 4 ios1 4 19 1mA ios2 20 11 1mA * * Supply Current * ips 4 11 0.2mA * * Error Terms
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EL2480
* ivos 0 23 0.2mA vxx 23 0 0V e4 24 0 3 0 1.0 e5 25 0 4 0 1.0 e6 26 0 11 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
EL2480 Macromodel
4
1
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