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EL2030
FN7028
120MHz Current Feedback Amplifier
The EL2030 is a very fast, wide bandwidth amplifier optimized for gains between -10 and +10. Built using the Elantec monolithic Complementary Bipolar process, this amplifier uses current mode feedback to achieve more bandwidth at a given gain than a conventional voltage feedback operational amplifier. Due to its wide operating supply range (15V) and extremely high slew rate of 2000V/s, the EL2030 drives 10V into 200 at a frequency of 30MHz, while achieving 110MHz of small signal bandwidth at AV = +2. This bandwidth is still 95MHz for a gain of +10. On 5V supplies the amplifier maintains a 90MHz bandwidth for AV = +2. When used as a unity gain buffer, the EL2030 has a 120MHz bandwidth with the gain precision and low distortion of closed loop buffers. The EL2030 features extremely low differential gain and phase, a low noise topology that reduces noise by a factor of 2 over competing amplifiers, and settling time of 40ns to 0.25% for a 10V step. The output is short circuit protected. In addition, datasheet limits are guaranteed for 5V and 15V supplies. Elantec's products and facilities comply with applicable quality specifications. See Elantec document, QRA-1: Processing, Monolithic Integrated Circuits.
Features
* -3dB bandwidth = 120MHz, AV = 1 * -3dB bandwidth = 110MHz, AV = 2 * 0.01% differential gain and 0.01 differential phase (NTSC, PAL) * 0.05% differential gain and 0.02 differential phase (HDTV) * Slew rate 2000V/s * 65mA output current * Drives 10V into 200 load * Characterized at 5V and 15V * Low voltage noise * Current mode feedback * Settling time of 40ns to 0.25% for a 10V step * Output short circuit protected * Low cost
Applications
* Video gain block * Video distribution amplifier * HDTV amplifier * Residue amplifiers in ADC
Ordering Information
PART NUMBER EL2030CN EL2030CM TEMP. RANGE -40C to +85C -40C to +85C PACKAGE 8-Pin PDIP 20-Pin SOL PKG. NO. MDP0031 MDP0027
* Current to voltage converter * Coax cable driver
Pinouts
EL2030 (8-PIN PDIP) TOP VIEW EL2030 (20-PIN SOL) TOP VIEW
NOTE: Non-Designated pins are no connects and are not electrically connected internally. Manufactured under U.S. Patent No. 4,893,091.
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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.
EL2030
Absolute Maximum Ratings (TA = 25C)
VS VIN VIN PD IIN IOP Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 18V or 36V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V or VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .6V Maximum Power Dissipation . . . . . . . . . . . . . . . . See Curves Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Peak Output Current . . . . . . . . . . . . . .Short Circuit Protected Output Short Circuit Duration . . . . . . . . . . . . . . . . . . . . . Continuous
A heat sink is required to keep the junction temperature below absolute maximum when the output is shorted.
TA TJ TST
Operating Temperature Range . . . . . . . . . . . .-40C to +85C Operating Junction Temperature Plastic Packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Storage Temperature . . . . . . . . . . . . . . . . . .-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 VS = 15V, RL = 200, unless otherwise specified
PARAMETER VOS DESCRIPTION Input Offset Voltage CONDITION VS = 15V TEMP 25C TMIN, TMAX VS = 5V 25C TMIN, TMAX VOS/T +IIN Offset Voltage Drift +Input Current VS = 5V, 15V 25C TMIN, TMAX -IIN -Input Current VS = 5V, 15V 25C TMIN, TMAX +RIN CIN CMRR -ICMR +Input Resistance Input Capacitance Common Mode Rejection Ratio (Note 1) Input Current Common Mode Rejection (Note 1) VS = 5V, 15V Full 25C Full 25C TMIN, TMAX PSRR +IPSR Power Supply Rejection Ratio (Note 2) +Input Current Power Supply Rejection (Note 2) Full 25C TMIN, TMAX -IPSR -Input Current Power Supply Rejection (Note 2) 25C TMIN, TMAX ROL Transimpedance (VOUT/(-IIN)) VOUT = 10V VOUT = 2.5V (Note 3) VS = 15V 25C TMIN, TMAX VS = 5V 25C TMIN, TMAX AVOL Open Loop DC Voltage Gain VOUT = 10V VOUT = 2.5V (Note 3) VO Output Voltage Swing (Note 3) VS = 15V Full 60 88 75 80 120 70 70 150 0.5 60 70 0.1 0.5 1.0 5.0 8.0 50 1.1 2.0 1 60 5 10 20 10 25 5 15 25 40 50 5 MIN TYP 10 MAX 20 30 10 15 UNITS mV mV mV mV V/C A A A A M pF dB A/V A/V dB A/V A/V A/V A/V V/mA V/mA V/mA V/mA dB
VS = 5V VS = 15V VS = 5V
Full Full Full Full Full
56 12 3 60 30
65 13 3.5 65 35
dB V V mA mA
IOUT
Output Current (Note 4)
VS = 15V VS = 5V
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EL2030
Open Loop DC Electrical Specifications VS = 15V, RL = 200, unless otherwise specified (Continued)
PARAMETER ROUT IS ISC NOTES: 1. VCM = 10V for VS = 15V. For VS = 5V, VCM = 2.5V. 2. VOS is measured at VS = 4.5V and at VS = 18V. Both supplies are changed simultaneously. 3. RL = 100. 4. For VS = 15V, VOUT = 10V. For VS 5V, VOUT = 2.5V. DESCRIPTION Output Resistance Quiescent Supply Current Short Circuit Current CONDITION TEMP 25C Full 25C MIN TYP 5 15 85 21 MAX UNITS mA mA
Closed Loop AC Electrical Characteristics
PARAMETER SR FPBW tR, tF tS G DESCRIPTION Slew Rate (Note 1) Full Power Bandwidth (Note 2) Rise Time. Fall Time
VS = 15V, AV = +2, RF = 820, RG = 820 and RL = 200 CONDITION TEMP 25C 25C VPP = 250mV 25C 25C 25C 25C 25C MIN 1200 19 TYP 2000 31.8 3 40 0.01 0.01 4 MAX UNITS V/s MHz ns ns % p-p p-p nV Hz
Settling Time to 0.25% for 10V step (Note 3) Differential Gain (Note 4) Differential Phase (Note 4)
eN NOTES:
Input Spot Noise at 1kHz RG = 101; RF = 909
1. VO = 10V, tested at VO = 5. See test circuit. 2. Full Power Bandwidth is specified based on Slew Rate measurement FPBW = SR/2VP. 3. Settling Time measurement techniques are shown in: "Take The Guesswork Out of Settling Time Measurements', EDN, September 19, 1985. Available from the factory upon request. 4. NTSC (3.58MHz) and PAL (4.43MHz).
3
EL2030 Typical Performance Curves
FIGURE 1. NTSC VIDEO DIFFERENTIAL GAIN AND PHASE TEST SET-UP
Differential Gain and Phase vs Load Resistance, Gain = +1
Differential Gain and Phase vs Load Capacitance, Gain = +1
Differential Gain and Phase vs Supply Voltage, Gain = +1
Differential Gain and Phase vs Load Resistance, Gain = +2
Differential Gain and Phase vs Load Capacitance, Gain = +2
Differential Gain and Phase vs Supply Voltage, Gain = +2
4
EL2030 Typical Performance Curves
(Continued)
FIGURE 2. HDTV AND WIDEBAND VIDEO DIFFERENTIAL GAIN AND PHASE TEST SET-UP
Differential Gain Error vs Frequency for Various DC Output Levels
Differential Phase Error vs Frequency for Various DC Output Levels
Risetime and Overshoot vs RF for AV = +1
Bandwidth and Peaking vs RF for AV = +1
Slew Rate vs Supply Voltage
5
EL2030 Typical Performance Curves
Risetime and Overshoot vs RF for AV = +2
(Continued)
Bandwidth and Peaking vs RF for AV = +2
-3dB Bandwidth vs Supply Voltage
Risetime and Overshoot vs RF for AV = +10
Bandwidth and Peaking vs RF for AV = +10
Voltage Gain vs Frequency for AV = +2, Various Capacitive Loads
Risetime and Overshoot vs RF for AV = +2, VS = 5V
Bandwidth and Peaking vs RF for AV = +2, VS = +5V
Output Settling Error vs Time
6
EL2030 Typical Performance Curves
(Continued)
Output Settling Error vs Time, VS = 5V
Input Offset Voltage vs Temperature
Input Bias Current vs Temperature
Output Swing vs Supply Voltage
Transimpedance (ROL)
Supply Current vs Supply Voltage
Current Limit vs Temperature
Power Supply Rejection vs Frequency
Common Mode Rejection vs Frequency
7
EL2030 Typical Performance Curves
(Continued)
Equivalent Input Noise
Long-Term Output Settling Error vs Time
Long-Term Output Settling Error vs Time, VS = 5V
8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature
20-Pin SOL Maximum Power Dissipation vs Ambient Temperature
Large Signal Response
Large Signal Response
AV = +1, RF = 1 k, RL = 200, VS = 15V
AV = +2, RF = RG = 820, RL = 200, VS = 15V
Large Signal Response
Large Signal Response
AV = +10, RF = 750, RG = 82, RL = 200, VS = 15V
AV = +2, RF = RG = 750, RL = 200, VS = 15V
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EL2030 Burn-In Circuit
In addition, the EL2030 will be destroyed or damaged in the same way for momentary power supply voltage reversals. This could happen, for example, during a power turn on transient, or if the power supply voltages were oscillating and the positive rail were instantaneously negative with respect to the negative rail or vice versa.
Differential Gain and Differential Phase
Composite video signals contain intensity, color, hue, timing and audio information in AM, FM, and Phase Modulation. These video signals pass through many stages during their production, processing, archiving and transmission. It is important that each stage not corrupt these signals to provide a "high fidelity" image to the end viewer. An industry standard way of measuring the distortion of a video component (or system) is to measure the amount of differential gain and phase error it introduces. A 100mV peak to peak sine wave at 3.58MHz for NTSC (4.3MHz for PAL), with 0V DC component serves as the reference. The reference signal is added to a DC offset, shifting the sine wave from 0V to 0.7V which is then applied to the device under test (DUT). The output signal from the DUT is compared to the reference signal. The Differential Gain is a measure of the change in amplitude of the sine wave and is measured in percent. The Differential Phase is a measure of the change in the phase of the sine wave and is measured in degrees. Typically, the maximum positive and negative deviations are summed to give peak differential gain and differential phase errors. The test setup in Figure 1 was used to characterize the EL2030. For higher than NTSC and PAL frequencies, an alternate Differential Gain and Phase measurement can be made using an HP3577A Network Analyzer and the setup shown in Figure 2. The frequency response is normalized to gain or phase with 0V DC at the input. From the normalized value a DC offset voltage is introduced and the Differential Gain or Phase is the deviation from the normalized value.
ALL PACKAGES USE THE SAME SCHEMATIC
Test Circuit
Application Information
Product Description
The EL2030 is a current mode feedback amplifier similar to the industry standard EL2020, but with greatly improved AC characteristics. Most significant among these are the extremely wide bandwidth and very low differential gain and phase. In addition, the EL2030 is fully characterized and tested at 5V and 15V supplies.
Power Supply Bypassing/Pin Dressing
It is important to bypass the power supplies of the EL2030 with 0.1F ceramic disc capacitors. Although the pin length is not critical, it should not be more the 1/2 inch from the IC pins. Failure to do this will result in oscillation, and possible destruction of the part. Another important detail is the pin length of the inputs. The inputs should be designed with minimum stray capacitance and short pin lengths to avoid ringing and distortion.
Video Applications
The video signals that must be transmitted for modest distances are usually amplified by a device such as the EL2030 and carried via coax cable. There are at least two ways to drive cables, single terminated and double terminated. When driving a cable, it is important to terminate it properly to avoid unwanted signal reflections. Single termination (75 to ground at receive end) may be sufficient for less demanding applications. In general, a double terminated cable (75 in series at drive end and 75 to ground at receive end) is preferred since the impedance match at both ends of the line will absorb signal reflections. However, when double termination is used (a total impedance of 150), the received signal is reduced by half; therefore, the amplifier is usually set at a gain of 2 or higher to compensate for attenuation.
Latch Mode
The EL2030 can be damaged in certain circumstances resulting in catastrophic failure in which destructive supply currents flow in the device. Specifically, an input signal greater than 5 volts at currents greater than 5mA is applied to the device when the power supply voltages are zero will result in failure of the device.
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EL2030
Video signals are 1V peak-peak in amplitude, from sync tip to peak white. There are 100 IRE (0.714V) of picture (from black to peak white of the transmitted signal) and 40 IRE (0.286V) of sync in a composite video signal (140 IRE = 1V). For video applications where a gain of two is used (double termination), the output of the video amplifier will be a maximum of 2V peak-peak. With 5V power supply, the EL2030 output swing of 3.5V is sufficient to satisfy the video output swing requirements. The EL2030 can drive two double terminated coax cables under these conditions. With 15V supplies, driving four double terminated cables is feasible. Although the EL2030's video characteristics (differential gain and phase) are impressive with 5V supplies at NTSC and PAL frequencies, it can be optimized when the supplies are increased to 15V, especially at 30MHz HDTV applications. This is primarily due to a reduction in internal parasitic junction capacitance with increased power supply voltage. The following table summarizes the behavior of the EL2030 at 5V and 15V for NTSC. In addition, 30MHz HDTV data is included. Refer to the differential gain and phase typical performance curves for more data.
VS 15V 15V 5V 15V 15V 5V 15V
RLOAD 75 150 150 75 150 150 150
AV 1 1 1 2 2 2 2
GAIN 0.02% 0.02% 0.05% 0.02% 0.01% 0.03% 0.05%
PHASE 0.03 0.02 0.02 0.08 0.02 0.09 0.02
COMMENTS Single terminated Double terminated Double terminated Single terminated Double terminated Double terminated HDTV, Double terminated
Equivalent Circuit
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EL2030 EL2030 Macromodel
* Revision A. March 1992 * Enhancements include PSRR, CMRR, and Slew Rate Limiting * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt M2030 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 50 l1 11 12 48nH iinp 3 0 5A iinm 2 0 10A 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 0.5H c5 17 0 1pF r5 17 0 500 * * Transimpedance Stage * g1 0 18 17 0 1.0 rol 18 0 150K cdp 18 0 2.8pF * * 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 2.5mA ios2 20 4 2.5mA * * Supply Current * ips 7 4 9mA * * Error Terms * ivos 0 23 5mA
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EL2030 EL2030 Macromodel
(Continued)
vxx 23 0 0V e4 24 3 1.0 e5 25 0 7 0 1.0 e6 26 0 4 0 1.0 r9 24 23 3K r10 25 23 1K r11 26 23 1K * * Models * .model qn npn (is=5e-15 bf=100 tf=0.1nS) .model qp pnp (is=5e-15 bf=100 tf=0.1nS) .model dclamp d(is=1e-30 ibv=0.266 bv=3.7 n=4) .ends
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