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NEW F OR DED , EL5263 N 60 MME ECO EE EL52 OT R S N
IGNS DES
EL5293, EL5293A
September 30, 2005 FN7193.2
Data Sheet
Dual 300MHz Current Feedback Amplifier with Enable
The EL5293 and EL5293A represent dual current feedback amplifiers with a bandwidth of 300MHz. This makes these amplifiers ideal for today's high speed video and monitor applications. With a supply current of just 4mA per amplifier and the ability to run from a single supply voltage from 5V to 10V, these amplifiers are also ideal for hand held, portable or battery powered equipment. The EL5293A also incorporates an enable and disable function to reduce the supply current to 100A typical per amplifier. Allowing the CE pin to float or applying a low logic level will enable the amplifier. The EL5293 is offered in the industry-standard 8-pin SO package and the space-saving 8-pin MSOP package. The EL5293A is available in a 10-pin MSOP package and all operate over the industrial temperature range of -40C to +85C.
Features
* 300MHz -3dB bandwidth * 4mA supply current (per amplifier) * Single and dual supply operation, from 5V to 10V * Fast enable/disable (EL5293A only) * Single (EL5193) and triple (EL5393) available * High speed, 1GHz product available (EL5191) * High speed, 6mA, 600MHz product available (EL5192, EL5292, and EL5392) * Pb-free plus anneal available (RoHS compliant)
Applications
* Battery-powered equipment * Hand-held, portable devices * Video amplifiers * Cable drivers * RGB amplifiers
Ordering Information
PART PART NUMBER MARKING EL5293CS EL5293CS-T7 EL5293CS-T13 EL5293CSZ (See Note) EL5293CSZ-T7 (See Note) 5293CS 5293CS 5293CS 5293CSZ 5293CSZ PACKAGE 8-Pin SO 8-Pin SO 8-Pin SO 8-Pin SO (Pb-free) 8-Pin SO (Pb-free) 8-Pin SO (Pb-free) 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP 10-Pin MSOP 10-Pin MSOP 10-Pin MSOP TAPE & REEL 7" 13" 7" 13" 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0043 MDP0043 MDP0043 MDP0043 MDP0043 MDP0043
* Test equipment * Instrumentation * Current to voltage converters
Pinouts
EL5293 (8-PIN SO, MSOP) TOP VIEW
OUTA 1 INA- 2 INA+ 3 VS- 4 + + 8 VS+ 7 OUTB 6 INB5 INB+
EL5293CSZ-T13 5293CSZ (See Note) EL5293CY EL5293CY-T7 EL5293CY-T13 EL5293ACY EL5293ACY-T7 V V V Y Y
EL5293A (10-PIN MSOP) TOP VIEW
INA+ 1 CEA 2 VS- 3 CEB 4 INB+ 5 + + 10 INA9 OUTA 8 VS+ 7 OUTB 6 INB-
EL5293ACY-T13 Y
NOTE: Intersil Pb-free plus anneal 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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2003, 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
EL5293, EL5293A
Absolute Maximum Ratings (TA = 25C)
Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . .11V Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 50mA Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 125C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Pin Voltages. . . . . . . . . . . . . . . . . . . . . . . . .VS- - 0.5V to VS+ +0.5V Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C Ambient Operating Temperature . . . . . . . . . . . . . . . .-40C to +85C
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
Electrical Specifications
PARAMETER AC PERFORMANCE BW -3dB Bandwidth
VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 375 for AV = 2, RL = 150, TA = 25C unless otherwise specified. CONDITIONS MIN TYP MAX UNIT
DESCRIPTION
AV = +1 AV = +2
300 200 20
MHz MHz MHz V/s ns dB nV/Hz pA/Hz pA/Hz %
BW1 SR tS CS eN iNiN+ dG dP
0.1dB Bandwidth Slew Rate 0.1% Settling Time Channel Separation Input Voltage Noise IN- Input Current Noise IN+ Input Current Noise Differential Gain Error (Note 1) Differential Phase Error (Note 1) AV = +2 AV = +2 VO = -2.5V to +2.5V, AV = +2 VOUT = -2.5V to +2.5V, AV = -1 f = 5MHz 1900
2200 12 60 4.4 17 50 0.03 0.04
DC PERFORMANCE VOS TCVOS ROL Offset Voltage Input Offset Voltage Temperature Coefficient Transimpediance Measured from TMIN to TMAX 300 -10 1 5 600 10 mV V/C k
INPUT CHARACTERISTICS CMIR CMRR +IIN -IIN RIN CIN Common Mode Input Range Common Mode Rejection Ratio + Input Current - Input Current Input Resistance Input Capacitance 3 42 -60 -35 3.3 50 1 1 45 0.5 80 35 V dB A A k pF
OUTPUT CHARACTERISTICS VO Output Voltage Swing RL = 150 to GND RL = 1k to GND IOUT SUPPLY ISON ISOFF Supply Current - Enabled (per amplifier) Supply Current - Disabled (per amplifier) No load, VIN = 0V No load, VIN = 0V 3 4 100 5 150 mA A Output Current RL = 10 to GND 3.4 3.8 95 3.7 4.0 120 V V mA
2
EL5293, EL5293A
Electrical Specifications
PARAMETER PSRR -IPSR VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 375 for AV = 2, RL = 150, TA = 25C unless otherwise specified. (Continued) DESCRIPTION Power Supply Rejection Ratio - Input Current Power Supply Rejection CONDITIONS DC, VS = 4.75V to 5.25V DC, VS = 4.75V to 5.25V MIN 55 -2 TYP 75 2 MAX UNIT dB A/V
ENABLE (EL5293A ONLY) tEN tDIS IIHCE IILCE VIHCE VILCE NOTE: 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz Enable Time Disable Time CE Pin Input High Current CE Pin Input Low Current CE Input High Voltage for Power-down CE Input Low Voltage for Power-down CE = VS+ CE = VSVS+ - 1 VS+ - 3 40 600 0.8 0 6 -0.1 ns ns A A V V
3
EL5293, EL5293A Typical Performance Curves
Non-Inverting Frequency Response (Gain) 6 AV=1 Normalized Magnitude (dB) 2 AV=2 -2 AV=5 -6 AV=10 -10 RF=750 RL=150 -14 1M 10M 100M Frequency (Hz) 1G -360 1M -270 RF=750 RL=150 10M 100M 1G Phase () -90 AV=5 AV=10 0 AV=2 90 AV=1 Non-Inverting Frequency Response (Phase)
-180
Frequency (Hz)
Inverting Frequency Response (Gain) 6 Normalized Magnitude (dB) AV=-1 AV=-2 90
Inverting Frequency Response (Phase)
AV=-1 0
2
-2 AV=-3 -6
Phase ()
-90
AV=-2 AV=-3
-180
-10 RF=500 RL=150 -14 1M 10M 100M 1G
-270 RF=500 RL=150 -360 1M 10M 100M 1G
Frequency (Hz)
Frequency (Hz)
Frequency Response for Various CIN10 Normalized Magnitude (dB) Normalized Magnitude (dB) 6
Frequency Response for Various RL
6
2pF added 1pF added
2
RL=100
RL=150
2
-2
RL=500
-2
0pF added
-6
-6
AV=2 RF=500 RL=150 10M 100M 1G
-10 AV=2 RF=500 -14 1M 10M 100M 1G
-10 1M
Frequency (Hz)
Frequency (Hz)
4
EL5293, EL5293A Typical Performance Curves
(Continued)
Frequency Response for Various CL 14 Normalized Magnitude (dB) Normalized Magnitude (dB) AV=2 RL=150 RF=RG=500 33pF 2 6
Frequency Response for Various RF
340
475
10
620 -2 750 -6 1.2k -10 AV=2 RG=RF RL=150 10M 100M 1G
6
22pF
2
15pF
-2
8pF 0pF
-6 1M
10M
100M
1G
-14 1M
Frequency (Hz)
Frequency (Hz)
Group Delay vs Frequency 3.5 Normalized Magnitude (dB) 3 2.5 Delay (ns) 2 1.5 1 0.5 0 1M AV=1 RF=750 AV=2 RF=500 6
Frequency Response for Various Common-Mode Input Voltages VCM=3V 2 VCM=0V
-2
VCM=-3V
-6
-10
AV=2 RF=500 RL=150 10M 100M 1G
10M
100M
1G
-14 1M
Frequency (Hz)
Frequency (Hz)
Transimpedance (ROL) vs Frequency 10M Phase 1M PSRR/CMRR (dB) Magnitude () -90 Phase () 100k -180 10k Gain 1k -360 100 1k 10k 100k 1M 10M 100M 1G -270 0 0 20
PSRR and CMRR vs Frequency
PSRR+
-20 PSRR-40
-60
CMRR
-80 10k
100k
1M
10M
100M
1G
Frequency (Hz)
Frequency (Hz)
5
EL5293, EL5293A Typical Performance Curves
(Continued)
-3dB Bandwidth vs Supply Voltage for Non-Inverting Gains 400 350 -3dB Bandwidth (MHz) 300 250 200 150 100 50 0 5 AV=5 AV=2 RF=750 RL=150 AV=1 -3dB Bandwidth (MHz) 200 250
-3dB Bandwidth vs Supply Voltage for Inverting Gains
AV=-1
150
AV=-2 AV=-5
100
50 AV=10 0 6 7 8 9 10 5 6 7 8 9 10 Total Supply Voltage (V) Total Supply Voltage (V) RF=500 RL=150
Peaking vs Supply Voltage for Non-Inverting Gains 4 3.5 3 Peaking (dB) 2.5 2 1.5 1 0.5 AV=10 0 5 6 7 8 9 10 AV=2 Peaking (dB) 1.5 AV=1 RF=750 RL=150 2 2.5
Peaking vs Supply Voltage for Inverting Gains
RF=500 RL=150
AV=-1
1 AV=-2
0.5
0 5
6
7
8
9
10
Total Supply Voltage (V)
Total Supply Voltage (V)
-3dB Bandwidth vs Temperature for Non-Inverting Gains 500 RF=750 RL=150 400 -3dB Bandwidth (MHz) AV=1 300 AV=2 -3dB Bandwidth (MHz) 200 250
-3dB Bandwidth vs Temperature for Inverting Gains
AV=-1 AV=-2
150
200
100
AV=-5
100
AV=5 AV=10 10 60 110 160
50 RF=500 RL=150 0 -40 10 60 110 160
0 -40
Ambient Temperature (C)
Ambient Temperature (C)
6
EL5293, EL5293A Typical Performance Curves
Peaking vs Temperature 2.5 RL=150 2 AV=1 Peaking (dB) 1.5 1 0.5 AV=-1 0 -0.5 -40 1 100 Voltage Noise (nV/Hz) Current Noise (pA/Hz) 100 in10 en in+ 1k
(Continued)
Voltage and Current Noise vs Frequency
10
60
110
160
1k
10k
100k
1M
10M
Ambient Temperature (C)
Frequency (Hz)
Closed Loop Output Impedance vs Frequency 100 10
Supply Current vs Supply Voltage
10 Output Impedance () Supply Current (mA)
8
1
6
0.1
4
0.01
2
0.001 100 1k 10k 100k 1M 10M 100M 1G Frequency (Hz)
0 0 2 4 6 8 10 12 Supply Voltage (V)
2nd and 3rd Harmonic Distortion vs Frequency -20 -30 Harmonic Distortion (dBc) -40 -50 -60 -70 -80 -90 1 10 Frequency (MHz) 100 2nd Order Distortion 3rd Order Distortion AV=+2 VOUT=2VP-P RL=100 25 20 15 10 5 0 -5
Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3) AV=+2 RL=150
Input Power Intercept (dBm)
AV=+2 RL=100 100 Frequency (MHz)
-10 10
7
EL5293, EL5293A Typical Performance Curves
(Continued)
Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.03 0.02 0.01 dG (%) or dP () 0 -0.01 -0.02 -0.03 -0.04 -0.05 -1 dG (%) or dP () dG AV=2 RF=RG=500 RL=150 dP 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03
Differential Gain/Phase vs DC Input Voltage at 3.58MHz AV=1 RF=750 RL=500
dP
dG
-0.5
0 DC Input Voltage
0.5
1
-0.04 -1
-0.5
0 DC Input Voltage
0.5
1
Output Voltage Swing vs Frequency THD<1% 10 RL=500 Output Voltage Swing (VPP) 8 RL=150 6 Output Voltage Swing (VPP) 8 10
Output Voltage Swing vs Frequency THD<0.1%
RL=500 6 RL=150 4
4
2 AV=2 0 1 10 Frequency (MHz) 100
2 AV=2 0 1 10 Frequency (MHz) 100
Small Signal Step Response
Large Signal Step Response
VS=5V RL=150 AV=2 RF=RG=500
VS=5V RL=150 AV=2 RF=RG=500
200mV/div
1V/div
10ns/div
10ns/div
8
EL5293, EL5293A Typical Performance Curves
(Continued)
Settling Time vs Settling Accuracy 25 AV=2 RF=RG=500 RL=150 VSTEP=5VP-P output RoI (k) 625
Transimpedance (RoI) vs Temperature
20 Settling Time (ns)
600
15
575
10
550 5
0 0.01
0.1 Settling Accuracy (%)
1
525 -40
10
60 Die Temperature (C)
110
160
PSRR and CMRR vs Temperature 90 80 70 60 50 40 30 20 10 -40 CMRR ICMR/IPSR (A/V) PSRR/CMRR (dB) 1 PSRR 2
ICMR and IPSR vs Temperature
1.5
ICMR+
IPSR 0.5 ICMR-
0
10
60 Die Temperature (C)
110
160
-0.5 -40
10
60 Die Temperature (C)
110
160
Offset Voltage vs Temperature 2 60 40 1 Input Current (A) 20 VOS (mV)
Input Current vs Temperature
IB0 -20 -40 IB+
0
-1
-2 -40
10
60 Die Temperature (C)
110
160
-60 -40
10
60 Temperature (C)
110
160
9
EL5293, EL5293A Typical Performance Curves
(Continued)
Positive Input Resistance vs Temperature 60 50 40 RIN+ (k) 30 20 10 0 -40 Supply Current (mA) 5
Supply Current vs Temperature
4
3
2
1
10
60 Temperature (C)
110
160
0 -40
10
60 Temperature (C)
110
160
Positive Output Swing vs Temperature for Various Loads 4.2 4.1 1k 4 VOUT (V) 3.9 3.8 3.7 3.6 3.5 -40 150 VOUT (V) -3.7 -3.8 -3.9 -4 -3.5 -3.6
Negative Output Swing vs Temperature for Various Loads
150
1k -4.1 -4.2 -40
10
60 Temperature (C)
110
160
10
60 Temperature (C)
110
160
Output Current vs Temperature 130 4000
Slew Rate vs Temperature
Sink 125 IOUT (mA) Slew Rate (V/S) 3500
Source 120
3000 AV=2 RF=RG=500 RL=150
115 -40
10
60 Die Temperature (C)
110
160
2500 -40
10
60 Die Temperature (C)
110
160
10
EL5293, EL5293A Typical Performance Curves
(Continued)
Channel-to-Channel Isolation vs Frequency 0
Enable Response
-20 500mV/div
Gain (dB)
-40
-60 5V/div -80
-100 100k
1M
10M Frequency (Hz)
100M
400M
20ns/div
Disable Response 1 0.9 Power Dissipation (W) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 400ns/div
Package Power Dissipation vs Ambient Temperature - JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board
500mV/div
625mW 486mW SO8 JA=160C/W
MSOP8/10 JA=206C/W
5V/div
0
25
50
75 85 100
125
150
Ambient Temperature (C) Package Power Dissipation vs Ambient Temperature - JEDEC JESD51-7 High Effective Thermal Conductivity Test Board 1 909mW Power Dissipation (W) 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150 Ambient Temperature (C) MSOP8/10 JA=115C/W 870mW SO8 JA=110C/W
11
EL5293, EL5293A Pin Descriptions
8-PIN SO & MSOP 1 10-PIN MSOP 9 PIN NAME OUTA FUNCTION Output, channel A EQUIVALENT CIRCUIT
VS+
OUT
VSCircuit 1
2
10
INA-
Inverting input, channel A
VS+
IN+
IN-
VSCircuit 2
3
1 2
INA+ CEA
Non-inverting input, channel A Chip enable, channel A
(see circuit 2)
VS+
CE
VSCircuit 3
4
3 4
VSCEB INB+ INBOUTB VS+
Negative supply Chip enable, channel B Non-inverting input, channel B Inverting input, channel B Output, channel B Positive supply (see circuit 3) (see circuit 2) (see circuit 2) (see circuit 1)
5 6 7 8
5 6 7 8
Applications Information
Product Description
The EL5293 is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 300MHz and a low supply current of 4mA per amplifier. The EL5293 works with supply voltages ranging from a single 5V to 10V and they are also capable of swinging to within 1V of either supply on the output. Because of their current-feedback topology, the EL5293 does not have the normal gain-bandwidth product associated with voltage-feedback operational amplifiers. Instead, 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 EL5293 the ideal choice for many low-power/highbandwidth applications such as portable, handheld, or battery-powered equipment.
For varying bandwidth needs, consider the EL5191 with 1GHz on a 9mA supply current or the EL5192 with 600MHz on a 6mA supply current. Versions include single, dual, and triple amp packages with 5-pin SOT23, 16-pin QSOP, and 8pin or 16-pin SO outlines.
Power Supply Bypassing and Printed Circuit Board Layout
As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Low impedance ground plane construction is essential. Surface mount components are recommended, but if leaded components are used, 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 0.01F capacitor has been shown to work well when placed at each supply pin.
12
EL5293, EL5293A
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) Even when ground plane construction is used, 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 additional series inductance. Use of sockets, particularly for the SO package, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot. bandwidth and peaking can be easily modified by varying the value of the feedback resistor. Because the EL5293 is a current-feedback amplifier, its gainbandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5293 to maintain about the same -3dB bandwidth. As 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 475 and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain.
Disable/Power-Down
The EL5293A amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 300A. The EL5293A is disabled when its CE pin is pulled up to within 1V of the positive supply. Similarly, the amplifier is enabled by floating or pulling its CE pin to at least 3V below the positive supply. For 5V supply, this means that an EL5293A amplifier will be enabled when CE is 2V or less, and disabled when CE is above 4V. Although the logic levels are not standard TTL, this choice of logic voltages allows the EL5293A to be enabled by tying CE to ground, even in 5V single supply applications. The CE pin can be driven from CMOS outputs.
Supply Voltage Range and Single-Supply Operation
The EL5293 has been designed to operate with supply voltages having a span of greater than 5V and less than 10V. In practical terms, this means that the EL5293 will operate on dual supplies ranging from 2.5V to 5V. With singlesupply, the EL5293 will operate from 5V to 10V. 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 EL5293 has an input range which extends to within 2V of either supply. So, for example, on +5V supplies, the EL5293 has an input range which spans 3V. The output range of the EL5293 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 larger because of the increased negative swing due to the external pull-down resistor to ground.
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 largevalue feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing the possibility of oscillation.) The EL5293 has been optimized with a 475 feedback resistor. With the high bandwidth of these amplifiers, these resistor values might cause stability problems when combined with parasitic capacitance, thus ground plane is not recommended around the inverting input pin of the amplifier.
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. Previously, 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 4mA supply current of each EL5293 amplifier. Special circuitry has been incorporated in the EL5293 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.03% and 0.04, 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 EL5293 has dG and dP specifications of 0.03% and 0.04.
Feedback Resistor Values
The EL5293 has been designed and specified at a gain of +2 with RF approximately 500. This value of feedback resistor gives 200MHz of -3dB bandwidth at AV=2 with 2dB of peaking. With AV=-2, an RF of approximately 500 gives 175MHz of bandwidth with 0.2dB of peaking. Since the EL5293 is a current-feedback 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, 13
Output Drive Capability
In spite of its low 4mA of supply current, the EL5293 is capable of providing a minimum of 95mA of output current. With a minimum of 95mA of output drive, the EL5293 is capable of driving 50 loads to both rails, making it an
EL5293, EL5293A
excellent choice for driving isolation transformers in telecommunications applications. 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
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 EL5293 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.
where: VS = Supply voltage ISMAX = Maximum supply current of 1A VOUTMAX = Maximum output voltage (required) RL = Load resistance
Current Limiting
The EL5293 has no internal current-limiting circuitry. If the output is shorted, it is possible to exceed the Absolute Maximum Rating for output current or power dissipation, potentially resulting in the destruction of the device.
Power Dissipation
With the high output drive capability of the EL5293, it is possible to exceed the 125C 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 modified for the EL5293 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
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 14

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