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EL2245, EL2445
Data Sheet March 27, 2002 FN7060
Dual/Quad Low-Power 100MHz Gain-of-2 Stable Op Amp
The EL2245 and EL2445 are dual and quad versions of the popular EL2045. They are high speed, low power, low cost monolithic operational amplifiers built on Elantec's proprietary complementary bipolar process. The EL2245 and EL2445 are gain-of-2 stable and feature a 275V/s slew rate and 100MHz bandwidth at gain-of-2 while requiring only 5.2mA of supply current per amplifier. The power supply operating range of the EL2245 and EL2445 is from 18V down to as little as 2V. For singlesupply operation, the EL2245 and EL2445 operate from 36V down to as little as 2.5V. The excellent power supply operating range of the EL2245 and EL2445 makes them an obvious choice for applications on a single +5V or +3V supply. The EL2245 and EL2445 also feature an extremely wide output voltage swing of 13.6V with VS = 15V and RL = 1k. At 5V, output voltage swing is a wide 3.8V with RL = 500 and 3.2V with RL = 150. Furthermore, for single-supply operation at +5V, output voltage swing is an excellent 0.3V to 3.8V with RL = 500. At a gain of +2, the EL2245 and EL2445 have a -3dB bandwidth of 100MHz with a phase margin of 50. Because of their conventional voltage-feedback topology, the EL2245 and EL2445 allow the use of reactive or non-linear elements in their feedback network. This versatility combined with low cost and 75mA of output-current drive make the EL2245 and EL2445 an ideal choice for price-sensitive applications requiring low power and high speed.
Features
* 100MHz gain-bandwidth * Gain-of-2 stable * Low supply current (per amplifier) - 5.2mA at VS = 15V * Wide supply range - 2.5V to 36V * High slew rate - 275V/s * Fast-settling - 80ns to 0.1% for a 10V step * Low differential gain - 0.02% at AV = +2, RL = 150 * Low differential phase - 0.07 at AV = +2, RL = 150 * Wide output voltage swing - 13.6V with VS = 15V, RL = 1k
Applications
* Video amplifiers * Single-supply amplifiers * Active filters/integrators * High speed signal processing * ADC/DAC buffers * Pulse/RF amplifiers * Pin diode receivers * Log amplifiers
Ordering Information
PART NUMBER EL2245CN EL2245CS EL2245CS-T7 EL2245CS-T13 EL2445CN EL2445CS EL2445CS-T7 EL2445CS-T13 PACKAGE 8-Pin PDIP 8-Pin SO 8-Pin SO 8-Pin SO 14-Pin PDIP 14-Pin SO (0.150") 14-Pin SO (0.150") 14-Pin SO (0.150") TAPE & REEL 7" 13" 7" 13" PKG. NO. MDP0031 MDP0027 MDP0027 MDP0027 MDP0031 MDP0027 MDP0027 MDP0027
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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 (c) 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.
EL2245, EL2445 Pinouts
EL2245 (8-PIN SO, PDIP) TOP VIEW
OUT 1 IN1- 2 IN1+ 3 V- 4
+ +
EL2445 [14-PIN SO (0.150"), PDIP] TOP VIEW
OUT1 1 IN1- 2 IN1+ 3 V+ 4 IN2+ 5 IN2- 6 OUT2 7
-+ +-+ +-
8 V+ 7 OUT2 6 IN25 IN2+
14 OUT4 13 IN412 IN4+ 11 V10 IN3+ 9 IN38 OUT3
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EL2245, EL2445
Absolute Maximum Ratings (TA = 25C)
Supply Voltage (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V or 36V Input Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VS Differential Input Voltage (dVIN) . . . . . . . . . . . . . . . . . . . . . . . . .10V Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA Power Dissipation (PD) . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Temperature Range (TA) . . . . . . . . . . . . . .-40C to +85C Operating Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . +150C Storage Temperature (TST) . . . . . . . . . . . . . . . . . . .-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
VS = 15V, RL = 1k, unless otherwise specified. CONDITION VS = 15V TEMP 25C TMIN, TMAX MIN TYP 0.5 MAX 4.0 6.0 10.0 2.8 8.2 9.2 2.8 50 300 400 50 0.3 1500 1500 2500 1750 65 60 70 70 14.0 4.2 4.2/0.1 13.4 13.1 12.0 3.4 13.4 3.8 3.2 3.6/0.4 3.5/0.5 40 35 75 3.8/0.3 13.6 90 80 3000 UNIT mV mV V/C A A A nA nA nA nA/C V/V V/V V/V V/V dB dB dB dB V V V V V V V V V V mA mA
DESCRIPTION Input Offset Voltage
TCVOS IB
Average Offset Voltage Drift Input Bias Current
(Note 1) VS = 15V
All 25C TMIN, TMAX
VS = 5V IOS Input Offset Current VS = 15V
25C 25C TMIN, TMAX
VS = 5V TCIOS AVOL Average Offset Current Drift Open-loop Gain (Note 1) VS = 15V,VOUT = 10V, RL = 1k
25C All 25C TMIN, TMAX
VS = 5V, VOUT = 2.5V, RL = 500 VS = 5V, VOUT = 2.5V, RL = 150 PSRR Power Supply Rejection Ratio VS = 5V to 15V
25C 25C 25C TMIN, TMAX
CMRR
Common-mode Rejection Ratio
VCM = 12V, VOUT = 0V
25C TMIN, TMAX
CMIR
Common-mode Input Range
VS = 15V VS = 5V VS = +5V
25C 25C 25C 25C TMIN, TMAX
VOUT
Output Voltage Swing
VS = 15V, RL = 1k
VS = 15V, RL = 500 VS = 5V, RL = 500 VS = 5V, RL = 150 VS = +5V, RL = 500
25C 25C 25C 25C TMIN, TMAX
ISC
Output Short Circuit Current
25C TMIN, TMAX
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EL2245, EL2445
DC Electrical Specifications
PARAMETER IS VS = 15V, RL = 1k, unless otherwise specified. (Continued) CONDITION VS = 15V, no load TEMP 25C TMIN TMAX VS = 5V, no load RIN Input Resistance Differential Common-mode CIN ROUT PSOR Input Capacitance Output Resistance Power-supply Operating Range AV = +1 @10MHz AV = +1 Dual-supply Single-supply NOTE: 1. Measured from TMIN to TMAX. 25C 25C 25C 25C 25C 25C 25C 2.0 2.5 5.0 150 15 1.0 50 18.0 36.0 MIN TYP 5.2 MAX 7 7.6 7.6 UNIT mA mA mA mA k M pF m V V
DESCRIPTION Supply Current (per amplifier)
Closed-Loop AC Electrical Specifications VS = 15V, AV = +2, RL = 1k unless otherwise specified.
PARAMETER BW DESCRIPTION -3dB Bandwidth (VOUT = 0.4VPP) CONDITION VS = 15V, AV = +2 VS = 15V, AV = -1 VS = 15V, AV = +5 VS = 15V, AV = +10 VS = 15V, AV = +20 VS = 5V, AV = +2 GBWP Gain-bandwidth Product VS = 15V VS = 5V PM CS SR Phase Margin Channel Separation Slew Rate (Note 1) RL = 1 k, CL = 10pF f = 5MHz VS = 15V, RL = 1k VS = 5V, RL = 500 FPBW Full-power Bandwidth (Note 2) VS = 15V VS = 5V tR, tF OS tPD tS dG dP eN iN NOTES: 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/(2 * Vpeak). 3. Video performance measured at VS = 15V, AV = +2 with 2 times normal video level across RL = 150. This corresponds to standard video levels across a back-terminated 75 load. For other values of RL, see curves. Rise Time, Fall Time Overshoot Propagation Delay Settling to +0.1% (AV = +1) Differential Gain (Note 3) Differential Phase (Note 3) Input Noise Voltage Input Noise Current VS = 15V, 10V step VS = 5V, 5V step NTSC/PAL NTSC/PAL 10kHz 10kHz 0.1V step 0.1V step TEMP 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 25C 3.2 200 MIN TYP 100 75 20 10 5 75 200 150 50 85 275 200 4.4 12.7 3.0 20 2.5 80 60 0.02 0.07 15.0 1.50 MAX UNIT MHz MHz MHz MHz MHz MHz MHz MHz dB V/s V/s MHz MHz ns % ns ns ns % nV/Hz pA/Hz
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EL2245, EL2445 Test Circuit
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
CMRR, PSRR and ClosedLoop 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
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EL2245, EL2445 Typical Performance Curves (Continued)
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 Output Current vs Temperature
Supply Current vs Temperature
Gain-Bandwidth Product vs Temperature
Open-Loop Gain PSRR and CMRR vs Temperature
Slew Rate vs Temperature
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EL2245, EL2445 Typical Performance Curves (Continued)
Short-Circuit Current vs Temperature Small-Signal Step Response Large-Signal Step Response
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 150 Loads at 3.58MHz
Differential Gain and Phase vs Number of 150 Loads at 4.43MHz
Channel Separation vs Frequency
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EL2245, EL2445 Typical Performance Curves (Continued)
Gain-Bandwidth Product vs Load Capacitance 100 Gain-Bandwidth Product (MHz) 40 35 80 Overshoot (%) 30 25 20 15 10 VS=15V AV=-2 1 10 100 Load Capacitance (pF) Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity (Single Layer) Test Board 1.8 1.6 1.54W 1 Power Dissipation (W) 1.2 1.25W 1 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150 Ambient Temperature (C) 0 0 25 50 75 85 100 125 150 Ambient Temperature (C) PDIP8 JA=100C/W PDIP14 JA=81C/W Power Dissipation (W) 1.4 0.8 781mW 0.6 0.4 0.2 SO8 JA=160C/W 1.042W SO14 JA=120C/W 1.2 1k 10k 5 0 50 VS=15V RG=1k 250 450 650 850 1050 Overshoot vs Load Capacitance
60
40
20
0
Load Capacitance (pF)
Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity (Single Layer) Test Board
Simplified Schematic (Per Amplifier)
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EL2245, EL2445 Burn-In Circuit (Per Amplifier)
where: TMAX = Maximum ambient temperature JA = Thermal resistance of the package PDMAX = Maximum power dissipation of each amplifier VS = Supply voltage ISMAX = Maximum supply current of each amplifier
ALL PACKAGES USE THE SAME SCHEMATIC
VOUTMAX = Maximum output voltage swing of the application RL = Load resistance To serve as a guide for the user, we can calculate maximum allowable supply voltages for the example of the video cabledriver below since we know that TJMAX = 150C, TMAX = 85C, ISMAX = 7.6mA per amplifier, and the package JAs are shown in Table 1. If we assume (for this example) that we are driving a back-terminated video cable, then the maximum average value (over duty-cycle) of VOUTMAX is 1.4V, and RL = 150, giving the results seen in Table 1.
TABLE 1. PART DUALS EL2245CN EL2245CS QUADS EL2445CN EL2445CS PDIP14 SO14 81C/W 120C/W 0.802W @85C 0.542W @85C 11.5V 7.5V PDIP8 SO8 100C/W 160C/W 0.650W @85C 0.406W @85C 16.6V 10.5V PACKAGE JA MAX PDISS @TMAX MAX VS
Applications Information
Product Description
The EL2245 and EL2445 are dual and quad low-power wideband monolithic operational amplifiers built on Elantec's proprietary high-speed complementary bipolar process. The EL2245 and EL2445 use a classical voltage-feedback topology which allows them 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 EL2245 and EL2445 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 EL2245 and EL2445 are an excellent choice for applications such as fast log amplifiers.
Power Dissipation
With the wide power supply range and large output drive capability of the EL2245 and EL2445, it is possible to exceed the 150C maximum junction temperatures under certain load and power-supply conditions. It is therefore important to calculate the maximum junction temperature (TJMAX) for all applications to determine if power supply voltages, load conditions, or package type need to be modified for the EL2245 and EL2445 to remain in the safe operating area. These parameters are related as follows:
T JMAX = T MAX + ( JA x PD MAXTOTAL )
Single-Supply Operation
The EL2245 and EL2445 have been designed to have a wide input and output voltage range. This design also makes the EL2245 and EL2445 an excellent choice for singlesupply operation. Using a single positive supply, the lower input voltage range is within 100mV of ground (RL = 500), 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 = 500. This results in a 3.5V output swing on a single 5V supply. This wide output voltage range also allows singlesupply operation with a supply voltage as high as 36V or as low as 2.5V. On a single 2.5V supply, the EL2245 and EL2445 still have 1V of output swing.
where: PDMAXTOTAL is the sum of the maximum power dissipation of each amplifier in the package (PDMAX). 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
Gain-Bandwidth Product and the -3dB Bandwidth
The EL2245 and EL2445 have a bandwidth at gain-of-2 of 100MHz while using only 5.2mA of supply current per amplifier. For gains greater than 4, their 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 amplifiers' transfer
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EL2245, EL2445
function contribute to even higher closed loop bandwidths. For example, the EL2245 and EL2445 have a -3dB bandwidth of 100MHz at a gain of +2, dropping to 20MHz at a gain of +5. It is important to note that the EL2245 and EL2445 have 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 EL2245 and EL2445 in a gain of +2 only exhibit 1.0dB of peaking with a 1k load. 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 0.1F 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 5k 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.
Video Performance
An industry-standard method of measuring the video distortion of components such as the EL2245/ EL2445 is to measure the amount of differential gain (dG) and differential phase (dP) that they introduce. 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. For signal transmission and distribution, a back-terminated cable (75 in series at the drive end, and 75 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 EL2245 and EL2445 have been designed as an economical solution for applications requiring low video distortion. They have 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 150, with standard video test levels at the input, the EL2245 and EL2445 exhibit 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 EL2245 and EL2445 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.
The EL2245 and EL2445 Macromodel
This macromodel has been developed to assist the user in simulating the EL2245 and EL2445 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. The model does not simulate these characteristics accurately: * Noise * Settling time * Non-linearities * Temperature effects * Manufacturing variations * CMRR * PSRR
Output Drive Capability
The EL2245 and EL2445 have been designed to drive low impedance loads. They can easily drive 6VPP into a 150 load. This high output drive capability makes the EL2245 and EL2445 an ideal choice for RF, IF and video applications. Furthermore, the current drive of the EL2245 and EL2445 remains a minimum of 35mA at low temperatures.
Printed-Circuit Layout
The EL2245 and EL2445 are well behaved, and easy to apply in most applications. However, a few simple 10
EL2245, EL2445 EL2245 and EL2445 Macromodel
* Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt M2245 3 2 7 4 6 * * Input stage * ie 7 37 1mA 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 1.3pF 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 * * 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
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EL2245, EL2445 EL2245 and EL2445 Macromodel
(Continued)
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