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CT ODU EMENT C E PR t OLET D REPLA Center a OBS NDE port om/tsc MME ical Sup rsil.c ECO Sheet n te NO R Data ech r www.in ur T o ct o onta TERSIL c -IN 1-888
EL2074
September 26, 2001 FN7150
400MHz GBWP Gain-of-2 Stable Operational Amplifier
The EL2074 is a precision voltagefeedback amplifier featuring a 400MHz gain-bandwidth product, fast settling time, excellent differential gain and differential phase performance, and a minimum of 50mA output current drive over temperature. The EL2074 is gain-of-2 stable with a -3dB bandwidth of 400MHz at AV = +2. It has a very low 200V of input offset voltage, only 2A of input bias current, and a fully symmetrical differential input. Like all voltage-feedback operational amplifiers, the EL2074 allows the use of reactive or non-linear components in the feedback loop. This combination of speed and versatility makes the EL2074 the ideal choice for all op-amp applications at a noise gain of 2 or greater 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 EL2074 an ideal amplifier for signal-processing and digitizing systems.
Features
* 400MHz gain-bandwidth product * Gain-of-2 stable * Ultra low video distortion = 0.01%/0.015 @NTSC/PAL * Conventional voltage-feedback topology * Low offset voltage = 200V * Low bias current = 2A * Low offset current = 0.1A * Output current = 50mA over temperature * Fast settling = 13ns to 0.1% * Low distortion = -55dB HD2, -70dB HD3 @20MHz, 2VPP, AV = +2
Applications
* High resolution video * Active filters/integrators * High-speed signal processing * ADC/DAC buffers
Pinout
EL2074 (8-PIN SO, PDIP) TOP VIEW
* Pulse/RF amplifiers * Pin diode receivers * Log amplifiers
NC
1
8
NC
* Photo multiplier amplifiers * High speed sample-and-holds
IN-
2 +
7
V+
IN+
3
6
OUT
Ordering Information
PART NUMBER EL2074CN EL2074CS EL2074CS-T7 EL2074CS-T13 PACKAGE 8-Pin PDIP 8-Pin SO 8-Pin SO 8-Pin SO TAPE & REEL 7" 13" PKG. NO. MDP0031 MDP0027 MDP0027 MDP0027
V-
4
5
NC
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 (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.
EL2074
Absolute Maximum Ratings (TA = 25C)
Supply Voltage (V S). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7V Output Current Output is short-circuit protected to ground, however, maximum reliability is obtained if IOUT does not exceed 70mA. Common-Mode Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V Thermal Resistance (PDIP) . . . . . . . . . . . . . . . . . . . . . . .JA = 95C/W Thermal Resistance (PDIP) . . . . . . . . . . . . . . . . . . . . . .JA = 175C/W Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +125C Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
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
Open-Loop DC Electrical Specifications
PARAMETER VOS TCV OS IB IOS PSRR CMRR IS RIN (diff) CIN (diff) RIN (cm) CIN (cm) ROUT CMIR DESCRIPTION Input Offset Voltage
VS = 5V, R L = 100, unless otherwise specified. TEST CONDITIONS VCM = 0V (Note 1) VCM = 0V VCM = 0V (Note 2) (Note 3) No Load TEMP 25C TMIN, TMAX MIN TYP 0.2 MAX 1.5 3 8 2 0.1 6 1 2 60 65 80 90 21 25 25 15 1 1 1 20 3 2.5 50 3.5 3 2.5 500 400 400 300 2.3 3.2 800 70 4 3.6 3.4 1000 3.5 UNIT mV mV V/C A A A dB dB mA mA k pF M pF m V V mA V V V V/V V/V V/V V/V nV/Hz pA/Hz
Average Offset Voltage Drift Input Bias Current Input Offset Current
All All 25C TMIN, TMAX
Power Supply Rejection Ratio Common Mode Rejection Ratio Supply Current - Quiescent
All All 25C TMIN, TMAX
RIN (Differential) CIN (Differential) RIN (Common-Mode) CIN (Common-Mode) Output Resistance Common-Mode Input Range
Open-Loop Open-Loop
25C 25C 25C 25C 25C 25C TMIN, TMAX
IOUT VOUT VOUT 100 VOUT 50 AVOL 100 AVOL 50 eN@ > 1MHz iN@ > 100kHz NOTES:
Output Current Output Voltage Swing Output Voltage Swing Output Voltage Swing Open-Loop Gain No Load 100 50 100
All All All All 25C TMIN, TMAX
Open-Loop Gain
50
25C TMIN, TMAX
Noise Voltage 1MHz to 100MHz Noise Current 100kHz to 100MHz
25C 25C
1. Measured from T MIN, TMAX 2. VCC = 4.5V to 5.5V 3. VIN = 2.5V, V OUT = 0V
2
EL2074
Closed-Loop AC Electrical Specifications
PARAMETER SSBW DESCRIPTION -3dB Bandwidth (V OUT = 0.4VPP) VS = 5V, A V = +2, RF = RG = 250, C F = 3pF, R L = 100 unless otherwise specified. TEMP 25C 25C TMIN, TMAX AV = +5 AV = +10 GBWP LSBWa LSBWb GFPL Gain-Bandwidth Product -3dB Bandwidth -3dB Bandwidth Peaking (< 50MHz) AV = +10 VOUT = 2VPP (Note 1) VOUT = 5VPP (Note 1) VOUT = 0.4VPP 25C 25C 25C All All 25C TMIN, TMAX GFPH Peaking (> 50MHz) VOUT = 0.4VPP 25C TMIN, TMAX GFR Rolloff (< 100MHz) VOUT = 0.4VPP 25C TMIN, TMAX LPD PM tr1, tf1 tr2, tf2 ts1 ts2 OS SR DISTORTION HD2a HD2c 2nd Harmonic Distortion 2nd Harmonic Distortion @ 10MHz, A V = +2 @ 20MHz, A V = +2 25C 25C TMIN, TMAX HD3a HD3c 3rd Harmonic Distortion 3rd Harmonic Distortion @ 10MHz, A V = +2 @ 20MHz, A V = +2 25C 25C TMIN, TMAX VIDEO PERFORMANCE (Note 3) dG dP dG dP VBW NOTES: 1. Large-signal bandwidth calculated using LSBW = Slew Rate / 2 VPEAK. 2. All distortion measurements are made with VOUT = 2VPP, RL = 100. 3. Video performance measured at AV = +2 with 2 times normal video level across RL = 100. This corresponds to standard video levels across a back-terminated 50 load, i.e., 0-100IRE, 40IREpp giving a 1V PP video signal across the 50 load. For other values of RL, see curves. Differential Gain Differential Phase Differential Gain Differential Phase 0.1dB Bandwidth Flatness NTSC NTSC 30MHz 30MHz 25C 25C 25C 25C 25C 25 0.01 0.015 0.1 0.1 50 0.05 0.05 %PP PP %PP PP MHz -72 -70 -65 -55 -55 -45 -45 -60 -60 -60 dBc dBc dBc dBc dBc dBc Linear Phase Deviation (< 100MHz) Phase Margin Rise Time, Fall Time Rise Time, Fall Time Settling to 0.1% (AV = -1) Settling to 0.01% (A V = -1) Overshoot Slew Rate VOUT = 0.4VPP AV = +2 0.4V Step, AV = +2 5V Step, A V = +2 2V Step 2V Step 2V Step 2V Step All 25C 25C 25C 25C 25C 25C All 275 1 50 1.8 8 13 25 5 400 0.1 0 43 17 250 250 100 40 400 63 25 0 1 1 2 2 0.5 0.5 1.8 MIN TYP 400 400 MAX UNIT MHz MHz MHz MHz MHz MHz MHz MHz dB dB dB dB dB dB ns ns ns ns % V/s
TEST CONDITIONS AV = -1 AV = +2
3
EL2074 Typical Performance Curves
Non-Inverting Frequency Response Inverting Frequency Response Frequency Response for Various R Ls
Open Loop Gain and Phase
Output Voltage Swing vs Frequency
Equivalent Input Noise
PSRR, CMRR, and ClosedLoop RO vs Frequency
2nd and 3rd Harmonic Distortion vs Frequency
2-Tone, 3rd Order Intermodulation Intercept
4
EL2074 Typical Performance Curves
(Continued)
Series Resistor and Resulting Bandwidth vs Capacitive Load
Settling Time vs Output Voltage Change
Settling Time vs Closed-Loop Gain
Common-Mode Rejection Ratio vs Input CommonMode Voltage
Bias and Offset Current vs Input Common-Mode Voltage
Supply Current vs Temperature
Bias and Offset Current vs Temperature
Offset Voltage vs Temperature
AVOL, PSRR, and CMRR vs Temperature
5
EL2074 Typical Performance Curves
(Continued)
Small Signal Transient Response
Large Signal Transient 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 DC Input Offset at 30MHz
Differential Gain and Phase vs Number of 150 Loads at 3.58MHz
Differential Gain and Phase vs Number of 150 Loads at 4.43MHz
Differential Gain and Phase vs Number of 150 Loads at 30MHz
6
EL2074 Equivalent Circuit
Burn-In Circuit
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 EL2074 is an excellent choice for applications such as log amplifiers. The EL2074 also has excellent DC specifications: 200V, VOS , 2A IB, 0.1A I OS , and 90dB of CMRR. These specifications allow the EL2074 to be used in DC-sensitive applications such as difference amplifiers. Furthermore, the current noise of the EL2074 is only 3.2pA/Hz, making it an excellent choice for high-sensitivity transimpedance amplifier configurations.
Gain-Bandwidth Product
All Packages Use The Same Schematic
Applications Information
Product Description
The EL2074 is a wideband monolithic operational amplifier built on a high-speed complementary bipolar process. The EL2074 uses a classical voltage-feedback topology which allows it to be used in a variety of applications requiring a noise gain 2 where current-feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. The conventional topology of the EL2074 allows, for example, a capacitor to be
The EL2074 has a gain-bandwidth product of 400MHz. For gains greater than 8, 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 8, higherorder poles in the amplifier's transfer function contribute to even higher closed loop bandwidths. For example, the EL2074 has a -3dB bandwidth of 400MHz at a gain of +2, dropping to 200MHz at a gain of +4. It is important to note that the EL2074 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 EL2074 in a gain of +2 only exhibits 1dB of peaking with a 100 load.
7
EL2074
Parasitic Capacitances and Stability
When used in positive-gain configurations, the EL2074 can be quite sensitive to parasitic capacitances at the inverting input, especially with values 250 for the gain resistor. The problem stems from the feedback and gain resistance in conjunction with the approximately 3pF of board-related parasitic capacitance from the inverting input to ground. Assuming a gain-of-2 configuration with RF = RG = 250, a feedback pole occurs at 424MHz, which is equivalent to a zero in the forward path at the same frequency. This zero reduces stability by reducing the effective phase-margin from about 50 to about 30. A common solution to this problem is to add an additional capacitor from the inverting input to the output. This capacitor, in conjunction with the parasitic capacitance, maintains a constant voltage-divider between the output and the inverting input. This technique is used for AC testing of the EL2074. A 3pF capacitor is placed in parallel with the feedback resistor for all AC tests. When this capacitor is used, it is also possible to increase the resistance values of the feedback and gain resistors without loss of stability, resulting in less loading of the EL2074 from the feedback network. The excellent output drive capability of the EL2074 allows it to drive up to 4 back-terminated loads with excellent video performance. With 4, 150 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 150 Loads.
Output Drive Capability
The EL2074 has been optimized to drive 50 and 75 loads. It can easily drive 6V PP into a 50 load. This high output drive capability makes the EL2074 an ideal choice for RF, IF and video applications. Furthermore, the current drive of the EL2074 remains a minimum of 50mA at low temperatures. The EL2074 is current-limited 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.
Capacitive Loads
Although the EL2074 has been optimized to drive resistive loads as low as 50, 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 R S vs Cload has been included for reference. Values of R S were chosen to maximize resulting bandwidth without peaking.
Video Performance
An industry-standard method of measuring the video distortion of a component such as the EL2074 is to measure the amount of differential gain (dG) and differential phase (dP) that it introduces. To make these measurements, a 0.286V PP (40IRE) signal is applied to the device with 0V DC offset (0IRE) 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 (100IRE). 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 EL2074 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 150, with standard video test levels at the input, the EL2074 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 EL2074 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.
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 1F-10F tantalum capacitor is recommended in parallel with a 0.01F ceramic capacitor. All pin 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 1000 to 2000 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 EL2074 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 surface-mount components (resistors, capacitors, etc.) is also recommended.
8
EL2074 EL2074 Macromodel
* * Connections: input * | -input * | | +Vsupply * ||| -Vsupply * ||| | output * ||| | | .subckt M2074 3 27 46 * *Input Stage * ie 37 4 1 mA 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 1 Meg * * Compensation Section * ga 0 34 33 0 2m rh 34 0 500K ch 34 0 0.8 pF rc 34 40 50 cc 40 0 0.05 pF * * Poles * ep 41 0 40 0 1 rpa 41 42 150 cpa 42 0 0.5 pF rpb 42 43 50 cpb 43 0 0.5 pF * * Output Stage * ios1 7 50 3.0 mA ios2 51 4 3.0 mA 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 11.4 mA * Models * .model qna npn(is800e-18 bf170 tf0.2 ns) .model qn npn(is810e-18 bf200 tf0.2 ns) .model qp pnp(is800e-18 bf200 tf0.2 ns) .ends
9
EL2074 EL2074 Macromodel (Continued)
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