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EL2099
January 1996, Rev. D FN7041
Video Distribution Amplifier
The EL2099 is a high speed, monolithic operational amplifier* featuring excellent video performance and high output current capability. Built using Elantec's Complementary Bipolar process, the EL2099 uses current mode feedback to achieve wide bandwidth, and is stable in unity gain configuration. Operation from power supplies ranging from 5V to 15V makes the EL2099 extremely versatile. With supplies at 15V, the EL2099 can deliver 11V into 25 at slew rates of 1000V/s. At 5V supplies, output voltage range is 3V into 25. Its speed and output current capability make this device ideal for video line driver and automatic test equipment applications. Differential Gain and Phase of the EL2099 are 0.03% and 0.05 respectively, and -3dB bandwidth is 50MHz. These features make the EL2099 especially well suited for video distribution applications.
Features
* 50MHz -3dB bandwidth, AV = +2 * Differential gain 0.03% * Differential phase 0.05 * Output short circuit current 800mA * Can drive six 75 double terminated cables 11V * Slew rate = 1000V/s * Wide supply voltage range 5V to 15V
Applications
* Video line driver * ATE pin driver * High speed data acquisition
Ordering Information
PART NUMBER EL2099CT TEMP. RANGE 0C to +75C PACKAGE 5-Pin TO-220 PKG. NO. MDP0028
Pinout
EL2099 (5-PIN TO-220) TOP VIEW
Manufactured under U.S. Patent Nos. 5,179,355, 4,893,091, U.K. Patent No. 2261786.
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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.
EL2099
Absolute Maximum Ratings (TA = 25C)
Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . . . . . .+33V Voltage at VS+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16.5V Voltage at VS- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -16.5V Voltage between VIN+ and VIN- . . . . . . . . . . . . . . . . . . . . . . . . . .6V Current into VIN+ or VIN- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Ambient Temperature Range . . . . . . . . . . . 0C to +75C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150C 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
Open-Loop DC Electrical Specifications
PARAMETER VOS DESCRIPTION Input Offset Voltage
VS = 15V, RL = 25, TA = 25C unless otherwise specified TEMP 25C TMIN, TMAX MIN TYP 5 MAX 20 25 20 5 20 30 8 35 50 50 60 85 700 600 3 12.5 9 2.4 360 600 11 3.0 440 800 800 32 45 60 70 140 1000 UNITS mV mV V/C A A A A dB dB k k k pF V V V mA mA mA mA
TC VOS +IIN
Average Offset Voltage Drift +Input Current
Full 25C TMIN, TMAX
-IIN
-Input Current
25C TMIN, TMAX
CMRR PSRR ROL +RIN
Common Mode Rejection Ratio (Note 1) Power Supply Rejection Ratio (Note 2) Transimpedance +Input Resistance (Note 3)
25C 25C 25C 25C TMIN, TMAX
+CIN CMIR VO
+Input Capacitance Common Mode Input Range Output Voltage Swing VS = 15V Output Voltage Swing VS = 5V
25C 25C 25C 25C 25C 25C TMIN, TMAX
IOUT ISC
Output Current Output Short-Circuit Current
IS NOTES:
Supply Current
25C
1. The input is moved from -10V to +10V. 2. The supplies are moved from 5V to 15V. 3. VIN = 5V. See typical performance curve for larger values of VIN.
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EL2099
Closed-Loop AC Electrical Specifications
PARAMETER SR BW Peaking tR, tF dG dP VS = 15V, AV = +2, RF = 510, RL = 25, TA = 25C unless otherwise specified MIN 500 TYP 1000 50 0.3 7 0.03 0.05 MAX UNITS V/s MHz dB ns % deg. ()
DESCRIPTION Slew Rate (Note 1) (Note 2) -3dB Bandwidth (Note 2) (Note 2) Rise Time, Fall Time (Note 2) (Note 3) Differential Gain; DC Input Offset from 0V through +0.714V, AC Amplitude 286mVP-P, f = 3.58MHz (Note 4) (Note 2) Differential Phase; DC Input Offset from 0V through +0.714V, AC Amplitude 286mVP-P, f = 3.58MHz (Note 2) (Note 4)
NOTES: 1. Slew Rate is with VOUT from +5V to -5V and measured at 20% and 80%. 2. All AC tests are performed on a "warmed up" part, except for Slew Rate, which is pulse tested. 3. Rise and Fall Times are with VOUT between -0.5V and +0.5V and measured at 10% and 90%. 4. See typical performance curves for other conditions.
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EL2099 Typical Performance Curves (TA = 25C, RL = 25, AV = +2, RF = 510 unless otherwise specified)
Non-Inverting Frequency Response (GAIN) Non-Inverting Frequency Response (PHASE)
Inverting Frequency Response (GAIN)
Inverting Frequency Response (PHASE)
Frequency Response for Various RL
Frequency Response for Various CL
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EL2099 Typical Performance Curves
(Continued)
Frequency Response for Various RF & RG
Transimpedance (ROL)
PSRR & CMRR vs Frequency
Closed-Loop Output Impedance vs Frequency
2nd and 3rd Harmonic Distortion vs Frequency
Voltage and Current Noise vs Frequency
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EL2099 Typical Performance Curves
Supply Current vs Die Temperature
(Continued)
Output Voltage vs Die Temperature
Transimpedance (ROL) vs Die Temperature
Input Current vs Die Temperature
PSRR & CMRR vs Die Temperature
Offset Voltage vs Die Temperature (4 Samples)
6
EL2099 Typical Performance Curves
(Continued)
Differential Gain vs DC Input Voltage for Various RLs
Differential Phase vs DC Input Voltage for Various RLs
Supply Current vs Supply Voltage
Slew Rate vs Supply Voltage
+Input Resistance vs Input Voltage
+Input Bias Current vs Input Voltage
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EL2099 Typical Performance Curves
(Continued)
-3dB Bandwidth vs RF
Peaking vs RF
Overshoot vs RF
Rise Time vs RF
5-Pin TO-220 Maximum Power Dissipation vs Ambient Temperature
Small Signal Pulse Response
Large Signal Pulse Response
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EL2099 Simplified Schematic
Burn-In Circuit
smaller values will work under some circumstances. All tests listed in this datasheet are performed with 50 in the +Input pin, as well as all typical performance curves. The 50 resistor along with the +Input bias current creates an additional typical Offset Voltage of only 250V at T = 25C, and a maximum of 1.25mV over temperature variations.
Feedback Resistor Values
The EL2099 has been designed and specified with RF = 510 and AV = +2. This value of feedback resistor yields extremely flat frequency response with little to no peaking. However, 3dB bandwidth is reduced somewhat because of this. Wider bandwidth, at the expense of slight peaking, can be accomplished by reducing the value of the feedback resistor. For example, at a gain of +2, reducing the feedback resistor to 330 increases the -3dB bandwidth to 70MHz with 3dB of peaking. Inversely, larger values of feedback resistor will cause roll off to occur at a lower frequency. There is essentially no peaking with RF > 510.
Applications Information
Product Description
The EL2099 is a current mode feedback amplifier that has high output current drive capability. It is built using Elantec's proprietary dielectric isolation process that produces NPN and PNP complimentary transistors. The high output current can be useful to drive many standard video loads in parallel, as well as digital sync pulses that are 8V or greater.
Power Supplies
The EL2099 may be operated with single or split supplies as low as 5V (10V total) to as high as 18V (36V total). Bandwidth and slew rate are almost constant from VS = 10V to 18V, and decrease slightly as supplies are reduced to 5V, as shown in the characteristic curves. It is not necessary to use equal value split supplies. For example, -5V and -12V would be fine for 0V to 1V video signals.
+Input Resistor Value
A small value resistor located in the +Input pin is necessary to keep the EL2099 from oscillating under certain conditions. A 50 resistor is recommended for all applications, although
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EL2099
Good power supply bypassing should be used to reduce the risk of oscillation. A 1F to 10F tantalum capacitor in parallel with a 0.1F ceramic capacitor is recommended for bypassing each supply pin. They should be kept as close as possible to the device pins. Due to the internal construction of the TO-220 package, the tab of the EL2099 is connected to the VS- pin. Therefore, care must be taken to avoid connecting the tab to the ground plane of the system.
Driving Cables and Capacitive Loads
The EL2099 was designed with driving multiple coaxial cables in mind. With 440mA of output drive and low output impedance, driving six, 75 double terminated coaxial cables to 11V with one EL2099 is practical. 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 EL2099 from the capacitive cable and allow extensive capacitive drive. For a discussion on some of the other ways to drive cables, see the application section on driving cables in the EL2003 data sheet. Other applications may have high capacitive loads without termination resistors. In these applications, an additional small value (5-50) resistor in series with the output will eliminate most peaking. The schematic below shows the EL2099 driving 6 double terminated cables, each of average length of 50 feet. This represents driving an effective load of 25 to over 10V. The resulting performance is shown in the scope photo. Notice that double termination results in reflection free performance.
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. Pin lengths should be as short as possible. For good AC performance, parasitic capacitances should be kept to a minimum, especially at the inverting input, which is sensitive to stray capacitance. This implies keeping the ground plane away from this pin. Metal film and carbon resistors are both acceptable, while use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low inductance for best performance.
5V / div
20ns/div
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EL2099 EL2099 Macromodel
* Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt M2099 4 5 1 3 2 * * Input Stage * e1 10 0 4 0 1.0 vis 10 9 0V h2 9 12 vxx 1.0 r1 5 11 50 l1 11 12 48nH iinp 4 0 5A iinm 5 0 -8A * * 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 0.001667 13 30 17 1.5H c5 17 0 1pF r5 17 0 500 * * Transimpedance Stage * g1 0 18 17 0 1.0 ro1 18 0 150K cdp 18 0 8pF * * Output Stage * q1 3 18 19 qp q2 1 18 20 qn q3 1 19 21 qn q4 3 20 22 qp r7 21 2 1 r8 22 2 1 ios1 1 19 5mA ios2 20 3 5mA * * Supply Current * ips 1 3 19mA * * Error Terms * ivos 0 23 5mA vxx 23 0 0V e4 24 0 2 0 1.0 e5 25 0 1 0 1.0
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EL2099 EL2099 Macromodel
e6 26 0 3 0 1.0 r9 24 23 3K r10 25 23 1K r11 26 23 1K * Models * .model qn npn (is=5e-15 bf=200 tf=0.1nS) .model qp pnp (is=5e-15 bf=200 tf=0.1nS) .model dclamp d (is=1e-30 ibv=0.266 bv=5 n=4) .ends
(Continued)
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