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EL5493, EL5493A
Data Sheet April, 2003 FN7202.1
Quad 300MHz Current Feedback Amplifier with Enable
The EL5493 and EL5493A are quad 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 EL5493A 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 EL5493 is offered in the industry-standard 14-pin SO (0.150") package and the EL5493A in the ultra-small 24-pin LPP package. Both 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 (EL5493A only) * Single (EL5193), dual (EL5293), and triple (EL5393) available * High speed, 1GHz product available (EL5191) * High speed, 6mA, 600MHz product available (EL5192, EL5292, EL5392 & EL5492)
Applications
* Battery-powered equipment * Hand-held, portable devices * Video amplifiers * Cable drivers * RGB amplifiers
Pinouts
EL5493A (24-PIN LPP) TOP VIEW EL5493 [14-PIN SO (0.150")] TOP VIEW
* Test equipment * Instrumentation * Current to voltage converters
23 OUTA
21 OUTD
24 INA-
20 IND-
22 NC
Ordering Information
19 NC 18 IND+ 17 CED OUTA 1 INA- 2 INA+ 3 VS+ 4 INB+ 5 INB- 6 OUTB 7 -+ B +C A -+ D +12 IND+ 11 VS10 INC+ 9 INC8 OUTC 14 OUTD
NC 1 INA+ 2 CEA 3 VS+ 4 CEB 5 INB+ 6 NC 7 NC 10 OUTC 11 OUTB 9 INC- 12 INB- 8 Thermal Pad
PART NUMBER
13 IND-
PACKAGE 14-Pin SO (0.150") 14-Pin SO (0.150") 14-Pin SO (0.150") 24-Pin LPP 24-Pin LPP 24-Pin LPP
TAPE & REEL 7" 13" 7" 13"
PKG. NO. MDP0027 MDP0027 MDP0027 MDP0046 MDP0046 MDP0046
EL5493CS EL5493CS-T7 EL5493CS-T13 EL5493ACL EL5493ACL-T7 EL5493ACL-T13
16 VS15 CEC 14 INC+ 13 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.
EL5493, EL5493A
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 PSRR -IPSR Supply Current - Enabled (per amplifier) Supply Current - Disabled Power Supply Rejection Ratio - Input Current Power Supply Rejection No load, VIN = 0V No load, VIN = 0V DC, VS = 4.75V to 5.25V DC, VS = 4.75V to 5.25V 55 -2 3 4 100 75 2 5 150 mA A dB A/V Output Current RL = 10 to GND 3.4 3.8 95 3.7 4.0 120 V V mA
2
EL5493, EL5493A
Electrical Specifications
PARAMETER ENABLE (EL5493A ONLY) tEN tDIS IIHCE IILCE VIHCE VILCE NOTES: 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz 2. Measured from the application of CE logic signal until the output voltage is at the 50% point between initial and final values Enable Time Disable Time (Note 2) 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 VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 375 for AV = 2, RL = 150, TA = 25C unless otherwise specified. (Continued) DESCRIPTION CONDITIONS MIN TYP MAX UNIT
3
EL5493, EL5493A Typical Performance Curves
Non-Inverting Frequency Response (Gain) 6 AV=1 Normalized Magnitude (dB) 2 AV=2 Phase () -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 Frequency (Hz) 1G -90 AV=5 AV=10 0 AV=2 90 AV=1 Non-Inverting Frequency Response (Phase)
-180
Inverting Frequency Response (Gain) 6 90
Inverting Frequency Response (Phase)
Normalized Magnitude (dB)
2
AV=-1
AV=-2
AV=-1 0
Phase ()
-2 AV=-3 -6
-90
AV=-2 AV=-3
-180
-10 RF=500 RL=150 -14 1M 10M 100M Frequency (Hz) 1G
-270 RF=500 RL=150 -360 1M 10M 100M Frequency (Hz) 1G
Frequency Response for Various CIN10 6
Frequency Response for Various RL
Normalized Magnitude (dB)
2pF added 1pF added
Normalized Magnitude (dB)
6
2
RL=100
RL=150
2
-2
RL=500
-2
0pF added
-6
-6
AV=2 RF=500 RL=150 10M 100M Frequency (Hz) 1G
-10 AV=2 RF=500 -14 1M 10M 100M Frequency (Hz) 1G
-10 1M
4
EL5493, EL5493A Typical Performance Curves
Frequency Response for Various CL 14 AV=2 RL=150 RF=RG=500 33pF Normalized Magnitude (dB) 2 620 -2 750 -6 1.2k -10 AV=2 RG=RF RL=150 10M 100M Frequency (Hz) 1G 6 340 475
(Continued)
Frequency Response for Various RF
Normalized Magnitude (dB)
10
6
22pF
2
15pF
-2
8pF 0pF
-6 1M
10M
100M Frequency (Hz)
1G
-14 1M
Group Delay vs Frequency 3.5 3 2.5 Delay (ns) 2 1.5 1 0.5 0 1M AV=1 RF=750 AV=2 RF=500 Normalized Magnitude (dB) 2 6
Frequency Response for Various Common-Mode Input Voltages
VCM=3V
VCM=0V
-2
VCM=-3V
-6
-10
AV=2 RF=500 RL=150 10M 100M Frequency (Hz) 1G
10M
100M Frequency (Hz)
1G
-14 1M
Transimpedance (ROL) vs Frequency 10M Phase 1M PSRR/CMRR (dB) -90 Magnitude () Phase () 100k -180 10k Gain 1k -360 100 1k -270 0 0 20
PSRR and CMRR vs Frequency
PSRR+
-20 PSRR-40
-60
CMRR
10k
100k
1M Frequency (Hz)
10M
100M
1G
-80 10k
100k
1M
10M
100M
1G
Frequency (Hz)
5
EL5493, EL5493A 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=1 200 -3dB Bandwidth (MHz) 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 RF=500 RL=150
Total Supply Voltage (V)
Total Supply Voltage (V)
Peaking vs Supply Voltage for Non-Inverting Gains 4 3.5 3 Peaking (dB) 2.5 2 1.5 AV=2 1 0.5 0.5 AV=10 0 5 6 7 8 9 10 AV=1 Peaking (dB) RF=750 RL=150 2 2.5
Peaking vs Supply Voltage for Inverting Gains
RF=500 RL=150
1.5
AV=-1
1
AV=-2
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) -3dB Bandwidth (MHz) AV=1 300 200 250
-3dB Bandwidth vs Temperature for Inverting Gains
AV=-1 AV=-2 150
200
AV=2
100 AV=-5 50 RF=500 RL=150
100
AV=5
0 -40
AV=10 10 60 Ambient Temperature (C) 110 160
0 -40
10
60 Ambient Temperature (C)
110
160
6
EL5493, EL5493A Typical Performance Curves
Peaking vs Temperature 2.5 RL=150 2 Voltage Noise (nV/Hz) Current Noise (pA/Hz) AV=1 1.5 Peaking (dB) 1k
(Continued)
Voltage and Current Noise vs Frequency
100
i n+ in-
1
0.5 AV=-1 0
10
en
-0.5 -40
10
60 Ambient Temperature (C)
110
160
1 100
1k
10k
100k
1M
10M
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
0 0 2 4 6 Supply Voltage (V) 8 10 12
Frequency (Hz)
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 Input Power Intercept (dBm) 15 10 5 0 -5
Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3) AV=+2 RL=150
AV=+2 RL=100 100 Frequency (MHz)
-10 10
7
EL5493, EL5493A Typical Performance Curves
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 -0.5 0 DC Input Voltage 0.5 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 -0.04 -1 -0.5 0 DC Input Voltage 0.5 1 dG AV=1 RF=750 RL=500
(Continued)
Differential Gain/Phase vs DC Input Voltage at 3.58MHz
dP
Output Voltage Swing vs Frequency THD<1% 10 RL=500 Output Voltage Swing (VPP) Output Voltage Swing (VPP) 8 RL=150 6 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
EL5493, EL5493A Typical Performance Curves
Settling Time vs Settling Accuracy 25 AV=2 RF=RG=500 RL=150 VSTEP=5VP-P output 625
(Continued)
Transimpedance (RoI) vs Temperature
20 Settling Time (ns)
600
15 RoI (k) 0.1 Settling Accuracy (%) 1 575
10
550 5
0 0.01
525 -40
10
60 Die Temperature (C)
110
160
PSRR and CMRR vs Temperature 90 80 70 60 50 40 30 0 20 10 -40 CMRR ICMR/IPSR (A/V) PSRR/CMRR (dB) 1 2
ICMR and IPSR vs Temperature
PSRR
1.5
ICMR+
IPSR 0.5
ICMR-
10
60 Die Temperature (C)
110
160
-0.5 -40
10
60 Die Temperature (C)
110
160
Offset Voltage vs Temperature 2 60
Input Current vs Temperature
40 1 Input Current (A) 20 IB0
VOS (mV)
0
-20
IB+
-1 -40
-2 -40
10
60 Die Temperature (C)
110
160
-60 -40
10
60 Temperature (C)
110
160
9
EL5493, EL5493A Typical Performance Curves
(Continued)
Positive Input Resistance vs Temperature 60 5
Supply Current vs Temperature
50 Supply Current (mA)
4
40 RIN+ (k)
3
30
2
20
10
1
0 -40
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) VOUT (V) 3.9 3.8 3.7 3.6 3.5 -40 150 -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 Slew Rate (V/S) 125 IOUT (mA) 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
EL5493, EL5493A Typical Performance Curves
(Continued)
Channel-to-Channel Isolation vs Frequency 0
Enable Response
-20
Gain (dB)
-40
500mV/div
-60 5V/div -80
-100 100k
1M
10M Frequency (Hz)
100M
400M
20ns/div
Disable Response 1
Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity (Single Layer) Test Board
833mW 0.8 Power Dissipation (W) 714mW 0.6 SO14 (0.150") 120C/W LPP24 140C/W
500mV/div
0.4
0.2 5V/div 0 400ns/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 (4 layer) Test Board - LPP exposed diepad soldered to PCB per JESD51-5 3
2.5 Power Dissipation (W)
2.703W
4 P2 LP /W C 37
2
1.5 1.136W 1
SO 14 (0 88 C/
.15 0")
W
0.5
0 0 25 50 75 85 100 125 150
Ambient Temperature (C)
11
EL5493, EL5493A Pin Descriptions
14-PIN SO (0.150") 1 24-PIN LPP 23 PIN NAME OUTA FUNCTION Output, channel A EQUIVALENT CIRCUIT
VS+
OUT
VSCircuit 1
2
24
INA-
Inverting input, channel A
VS+
IN+
IN-
VSCircuit 2
3
2 3
INA+ CEA
Non-inverting input, channel A Chip enable, channel A
(see circuit 2)
VS+
CE
VSCircuit 3
4
4 5
VS+ CEB INB+ INBOUTB OUTC INCINC+ CEC VSCED IND+ INDOUTD NC
Positive supply Chip enable, channel B Non-inverting input, channel B Inverting input, channel B Output, channel B Output, channel C Inverting input, channel C Non-inverting input, channel C Chip enable, channel C Negative supply Chip enable, channel D Non-inverting input, channel D Inverting input, channel D Output, channel D No connection (see circuit 3) (see circuit 2) (see circuit 1) (see circuit 1) (see circuit 3) (see circuit 2) (see circuit 2) (see circuit 1) (see circuit 1) (see circuit 2) (see circuit 2) (see circuit 3)
5 6 7 8 9 10
6 8 9 11 12 14 15
11
16 17
12 13 14
18 20 21 1, 7, 10, 13, 19, 22
12
EL5493, EL5493A Applications Information
Product Description
The EL5493 is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 300MHz and a low supply current of 4mA per amplifier. The EL5493 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 its current-feedback topology, the EL5493 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 EL5493 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 also include single, dual, triple, and quad amp packages. above 4V. Although the logic levels are not standard TTL, this choice of logic voltages allows the EL5493A to be enabled by tying CE to ground, even in 5V single supply applications. The CE pin can be driven from CMOS outputs.
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 EL5493 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.
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. 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 (0.150") package, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot.
Feedback Resistor Values
The EL5493 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 EL5493 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, bandwidth and peaking can be easily modified by varying the value of the feedback resistor. Because the EL5493 is a current-feedback amplifier, its gainbandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5493 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 EL5493A amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 600A. The EL5493A 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 EL5493A amplifier will be enabled when CE is 2V or less, and disabled when CE is
Supply Voltage Range and Single-Supply Operation
The EL5493 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 EL5493 will operate on dual supplies ranging from 2.5V to 5V. With singlesupply, the EL5493 will operate from 5V to 10V. As supply voltages continue to decrease, it becomes necessary to provide input and output voltage ranges that
13
EL5493, EL5493A
can get as close as possible to the supply voltages. The EL5493 has an input range which extends to within 2V of either supply. So, for example, on +5V supplies, the EL5493 has an input range which spans 3V. The output range of the EL5493 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. possible to simply increase the value of the feedback resistor (RF) to reduce the peaking.
Current Limiting
The EL5493 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 EL5493, 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 EL5493 to remain in the safe operating area. These parameters are calculated as follows:
T JMAX = T MAX + ( JA x n x PD MAX )
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 EL5493 amplifier. Special circuitry has been incorporated in the EL5493 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.03% and 0.04C, 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 EL5493 has dG and dP specifications of 0.03% and 0.04C.
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 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 --------------------------RL
Output Drive Capability
In spite of its low 4mA of supply current, the EL5493 is capable of providing a minimum of 95mA of output current. With a minimum of 95mA of output drive, the EL5493 is capable of driving 50 loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications.
where: VS = Supply voltage ISMAX = Maximum supply current of 1A VOUTMAX = Maximum output voltage (required) RL = Load resistance
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 EL5493 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
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