View EL5492ACL_909502.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

EL5492C, EL5492AC
(R)
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
(R)
Features
* 600MHz -3dB bandwidth * 6mA supply current (per amplifier) * Single and dual supply operation, from 5V to 10V * Fast enable/disable (EL5492AC only) * Single (EL5192C), dual (EL5292C), and triple (EL5392C) available * High speed, 1GHz product available (EL5191C) * Low power, 4mA, 300MHz product available (EL5193C, EL5293C, EL5393C, & EL5493C)
General Description
The EL5492C and EL5492AC are quad current feedback amplifiers with a very high bandwidth of 600MHz. This makes these amplifiers ideal for today's high speed video and monitor applications. With a supply current of just 6mA 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 EL5492AC 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 EL5492C is offered in the industry-standard 14-pin SO (0.150") package and the EL5492AC in the ultra-small 24-pin LPP package. Both operate over the industrial temperature range of -40C to +85C.
Applications
* * * * * * Video amplifiers Cable drivers RGB amplifiers Test equipment Instrumentation Current to voltage converters
Pin Configurations
21 OUTD
23 OUTA
NC 1
20 IND19 NC OUTA 1 14 OUTD A INA+ 3 + + D 12 IND+ 11 VS10 INC+ INB- 6 B + + C 9 INC8 OUTC EL5492CS [14-Pin SO (0.150")] 13 IND18 IND+ INA- 2 17 CED 16 VSVS+ 4 15 CEC INB+ 5 14 INC+ 13 NC
24 INA-
Ordering Information
Part No EL5492CS EL5492CS-T7 EL5492CS-T13 EL5492ACL EL5492ACL-T7 EL5492ACL-T13 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" Outline # MDP0027 MDP0027 MDP0027 MDP0046 MDP0046 MDP0046
INA+ 2 CEA 3 VS+ 4 CEB 5 INB+ 6 NC 7 NC 10 OUTC 11 OUTB 9 INC- 12 INB- 8 Thermal Pad
22 NC
OUTB 7
February 28, 2002
EL5492ACL (24-Pin LPP - Top View)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-ELANTEC or 408-945-1323 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Elantec (R) is a registered trademark of Elantec Semiconductor, Inc. Copyright (c) Intersil Americas Inc. 2002. All Rights Reserved
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Absolute Maximum Ratings (T
A
= 25C)
Values beyond absolute maximum ratings can cause the device to be prematurely damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 11V Supply Voltage between VS+ and VSMaximum Continuous Output Current 50mA
Operating Junction Temperature Power Dissipation Pin Voltages Storage Temperature Operating Temperature
125C See Curves VS- - 0.5V to VS+ +0.5V -65C to +150C -40C to +85C
Important Note: All parameters having Min/Max specifications are guaranteed. Typ 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 Characteristics
VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 375 for AV = 2, RL = 150, TA = 25C unless otherwise specified. Parameter AC Performance BW BW1 SR tS CS eN iNiN+ dG dP VOS TCVOS ROL CMIR CMRR +IIN -IIN RIN CIN VO IOUT Supply ISON ISOFF PSRR -IPSR Supply Current - Enabled 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 = 4.75 to 5.25V 55 -2 5 6 100 75 2 7.5 150 mA A dB A/V -3dB Bandwidth 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 Differential Phase Error Offset Voltage Input Offset Voltage Temperature Coefficient Transimpediance Common Mode Input Range Common Mode Rejection Ratio + Input Current - Input Current Input Resistance Input Capacitance Output Voltage Swing Output Current RL = 150 to GND RL = 1k to GND RL = 10 to GND 3.4 3.8 95 Measured from TMIN to TMAX 200 3 42 -60 -35
[1] [1]
Description AV = +1 AV = +2
Conditions
Min
Typ 600 300 25
Max
Unit MHz MHz MHz V/s ns dB nV/Hz pA/Hz pA/Hz %
VO = -2.5V to +2.5V, AV = +2 VOUT = -2.5V to +2.5V, AV = -1 f = 5MHz
2000
2300 9 60 4.1 20 50
AV = +2 AV = +2 -10
0.015 0.04 1 5 400 3.3 50 3 4 37 0.5 3.7 4.0 120 60 35 10
DC Performance mV V/C k V dB A A k pF V V mA
Input Characteristics
Output Characteristics
2
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Electrical Characteristics
VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 375 for AV = 2, RL = 150, TA = 25C unless otherwise specified. Parameter Enable (EL5492AC only) tEN tDIS IIHCE IILCE VIHCE VILCE Enable Time Disable Time [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 Description Conditions Min Typ Max Unit
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
3
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Typical Performance Curves
Non-Inverting Frequency Response (Gain) 6 AV=1 Normalized Magnitude (dB) 2 AV=2 0 90
Non-Inverting Frequency Response (Phase)
AV=1 AV=2
AV=5 -6 AV=10 -10 RF=750 RL=150 -14 1M 10M 100M Frequency (Hz) Inverting Frequency Response (Gain) 6 AV=-1 AV=-2 1G
Phase ()
-2
-90
AV=5 AV=10
-180
-270 RF=750 RL=150 -360 1M 10M 100M Frequency (Hz) Inverting Frequency Response (Phase) 90 AV=-1 1G
Normalized Magnitude (dB)
2
0
AV=-5 -6
Phase ()
-2
-90
AV=-2 AV=-5
-180
-10 RF=375 RL=150 -14 1M 10M 100M Frequency (Hz) Frequency Response for Various CIN10 2pF added 1G
-270 RF=375 RL=150 -360 1M 10M 100M Frequency (Hz) Frequency Response for Various RL 6 RL=150 Normalized Magnitude (dB) 2 RL=500 RL=100 1G
Normalized Magnitude (dB)
6 1pF added 2
-2
-2
0pF added
-6
-6
-10 1M
AV=2 RF=375 RL=150 10M 100M Frequency (Hz) 1G
-10 AV=2 RF=375 -14 1M 10M 100M Frequency (Hz) 1G
4
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Typical Performance Curves
Frequency Response for Various CL 14 6
Frequency Response for Various RF
250 Normalized Magnitude (dB) Normalized Magnitude (dB) 10 12pF added 2
375 475
6
8pF added
-2
620 750 AV=2 RG=RF RL=150 10M 100M Frequency (Hz) Frequency Response for Various Common-Mode Input Voltages 1G
2
-6
-2
AV=2 RF=375 RL=150 10M
0pF added
-10
-6 1M
100M Frequency (Hz)
1G
-14 1M
Group Delay vs Frequency 3.5 3 2.5 Group Delay (ns) 2 1.5 1 0.5 0 1M AV=1 RF=750 AV=2 RF=375 Normalized Magnitude (dB) 2 6
VCM=3V
VCM=0V
-2
VCM=-3V
-6
-10
10M
100M Frequency (Hz)
1G
-14 1M
AV=2 RF=375 RL=150 10M 100M Frequency (Hz) 1G
Transimpedance (ROL) vs Frequency 10M 0 1M Magnitude () Phase PSRR/CMRR (dB) -90 Phase () 100k -180 10k Gain 1k -360 100 1k 10k 100k 1M 10M Frequency (Hz) 100M 1G -270 0 20
PSRR and CMRR vs Frequency
PSRR+
-20 PSRR-40
-60
CMRR
-80 10k
100k
1M 10M Frequency (Hz)
100M
1G
5
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Typical Performance Curves
-3dB Bandwidth vs Supply Voltage for Non-Inverting Gains 800 RF=750 RL=150 -3dB Bandwidth (MHz) -3dB Bandwidth (MHz) 600 AV=1 350 300 250
-3dB Bandwidth vs Supply Voltage for Inverting Gains
AV=-1
AV=-2 200 AV=-5 150 100 50 0 RF=375 RL=150 5 6 7 8 9 10
400 AV=2 200 AV=5 0 5 6 7 8 9 10 Total Supply Voltage (V) Peaking vs Supply Voltage for Non-Inverting Gains 4 AV=1 3 RF=750 RL=150 AV=10
Total Supply Voltage (V) Peaking vs Supply Voltage for Inverting Gains 4 AV=-1 3 Peaking (dB) RF=375 RL=150
Peaking (dB)
2
2
AV=-2
1 AV=2 0 5 6 7 8 9 10 Total Supply Voltage (V) -3dB Bandwidth vs Temperature for Non-Inverting Gains 1400 1200 -3dB Bandwidth (MHz) 1000 800 600 400 AV=2 200 0 -40 AV=5 AV=10 AV=1 RF=750 RL=150 AV=10
1 AV=-5 0 5 6 7 8 9 10 Total Supply Voltage (V) -3dB Bandwidth vs Temperature for Inverting Gains 500 AV=-1 RF=375 RL=150
400 -3dB Bandwidth (MHz)
300
AV=-2
200 AV=-5 100
10
60
110
160
0 -40
10
60
110
160
Ambient Temperature (C)
Ambient Temperature (C)
6
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Typical Performance Curves
Peaking vs Temperature 2 RL=150 1.5 AV=1 1k Voltage and Current Noise vs Frequency
Voltage Noise (nV/Hz) Current Noise (pA/Hz)
100 in10
in+
Peaking (dB)
1 AV=-1 0.5 AV=-2
en
0 AV=2 -0.5 -50 1 100
-50
0 Ambient Temperature (C)
50
100
1k
10k 100k Frequency (Hz)
1M
10M
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
0 1k 10k 1M 100k Frequency (Hz) 10M 100M 1G 0 2 4 6 8 Supply Voltage (V) 10 12
2nd and 3rd Harmonic Distortion vs Frequency -20 -30 Harmonic Distortion (dBc) -40 -50 -60 -70 -80 -90 -100 1 10 Frequency (MHz) 100 AV=+2 VOUT=2VP-P RL=100 30 25 Input Power Intercept (dBm) 20 15 10 5 0 -5 -10
Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3) AV=+2 RL=150
2nd Order Distortion 3rd Order Distortion
AV=+2 RL=100 100 Frequency (MHz) 200
-15 10
7
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Typical Performance Curves
Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.03 0.02 0.01 dG (%) or dP () 0 dG -0.01 -0.02 -0.03 -0.04 -0.05 -1 -0.5 0 DC Input Voltage Output Voltage Swing vs Frequency THD<1% 9 8 Output Voltage Swing (VPP) 7 6 5 4 3 2 1 0 1 10 Frequency (MHz) 100 AV=2 0 RL=150 RL=500 Output Voltage Swing (VPP) 8 10 0.5 1 AV=2 RF=RG=375 RL=150 dP 0.03 0.02 0.01 dG (%) or dP () 0 -0.01 -0.02 -0.03 -0.04 -0.05
Differential Gain/Phase vs DC Input Voltage at 3.58MHz AV=1 RF=750 RL=500 dP
dG
-0.06 -1
-0.5
0 DC Input Voltage
0.5
1
Output Voltage Swing vs Frequency THD<0.1% RL=500 RL=150 6
4
2 AV=2 1 10 Frequency (MHz) 100
Small Signal Step Response VS=5V RL=150 AV=2 RF=RG=375
Large Signal Step Response VS=5V RL=150 AV=2 RF=RG=375
200mV/div
1V/div
10ns/div
10ns/div
8
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Typical Performance Curves
Settling Time vs Settling Accuracy 25 AV=2 RF=RG=375 RL=150 VSTEP=5VP-P output RoI (k) 500
Transimpedance (RoI) vs Temperature
20 Settling Time (ns)
450
15
400
10
5
350
0 0.01
0.1 Settling Accuracy (%)
1
300 -40
10
60 Die Temperature (C)
110
160
PSRR and CMRR vs Temperature 90 80 70 60 CMRR 50 40 30 20 10 -40 10 60 Die Temperature (C) Offset Voltage vs Temperature 3 60 40 2 Input Current (A) 20 110 160 ICMR/IPSR (A/V) PSRR/CMRR (dB) PSRR 2.5 2 1.5 1 0.5 0
ICMR and IPSR vs Temperature
ICMR+
IPSR
ICMR-0.5 -1 -40
10
60 Die Temperature (C)
110
160
Input Current vs Temperature
VOS (mV)
1
IB0 -20 -40 -60 IB+
0
-1
-2 -40
10
60 Die Temperature (C)
110
160
-80 -40
10
60 Temperature (C)
110
160
9
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Typical Performance Curves
Positive Input Resistance vs Temperature 50 45 40 Supply Current (mA) 35 RIN+ (k) 30 25 20 15 10 5 0 -40 10 60 Temperature (C) 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 -4.1 -3.5 -3.6 110 160 8 7 6 5 4 3 2 1
Supply Current vs Temperature
0 -40
10
60 Temperature (C)
110
160
Negative Output Swing vs Temperature for Various Loads
150
1k
10
50 Temperature (C)
110
160
-4.2 -40
10
60 Temperature (C)
110
160
Output Current vs Temperature 135 4600 4400 130 IOUT (mA) Sink Slew Rate (V/S) 4200 4000 3800 3600 3400 3200 115 -40 10 60 Die Temperature (C) 110 160
Slew Rate vs Temperature AV=2 RF=RG=375 RL=150
125 Source 120
3000 -40
10
60 Die Temperature (C)
110
160
10
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Typical Performance Curves
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
Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity (Single Layer) Test Board 833mW 0.8 Power Dissipation (W)
500mV/div
714mW 0.6 LPP24 140C/W SO14 (0.150") 120C/W
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 2.703W Power Dissipation (W)
LP
2
37
4 P2 W
/ C
1.5 1.136W 1 0.5 0 0 25
SO1 4 (0 .150 ") 88 C /W
50
75 85
100
125
150
Ambient Temperature (C)
11
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Pin Descriptions
EL5492CS 14-Pin SO (0.150") 1 EL5492ACL 24-Pin LPP 23 Pin Name OUTA Output, channel A Function 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 5 6 7 8 9 10 11 12 13 14
4 5 6 8 9 11 12 14 15 16 17 18 20 21 1, 7, 10, 13, 19, 22
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)
12
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Applications Information
Product Description
The EL5492C is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 600MHz and a low supply current of 6mA per amplifier. The EL5492C 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 currentfeedback topology, the EL5492C does not have the normal gain-bandwidth product associated with voltagefeedback 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 EL5492C the ideal choice for many low-power/highbandwidth applications such as portable, handheld, or battery-powered equipment. For varying bandwidth needs, consider the EL5191C with 1GHz on a 9mA supply current or the EL5193C with 300MHz on a 4mA supply current. Versions include single, dual, and triple amp packages with 5-pin SOT23, 16-pin QSOP, and 8-pin or 16-pin SO (0.150") outlines. 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.
Disable/Power-Down
The EL5492AC amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 600 A. The EL5492AC 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 EL5492AC 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 EL5492AC 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 currentfeedback 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 openloop response. The use of large-value feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing the possibility of oscillation.) The EL5492C has been optimized with a 375 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
13
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Feedback Resistor Values
The EL5492C has been designed and specified at a gain of +2 with RF approximately 375. This value of feedback resistor gives 300MHz of -3dB bandwidth at AV=2 with 2dB of peaking. With AV=-2, an RF of 375 gives 275MHz of bandwidth with 1dB of peaking. Since the EL5492C 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 EL5492C is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5492C 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 375 and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain.
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 6mA supply current of each EL5492C amplifier. Special circuitry has been incorporated in the EL5492C to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.015% 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 EL5492C has dG and dP specifications of 0.03% and 0.05, respectively.
Output Drive Capability
In spite of its low 6mA of supply current, the EL5492C is capable of providing a minimum of 95mA of output current. With a minimum of 95mA of output drive, the EL5492C is capable of driving 50 loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications.
Supply Voltage Range and Single-Supply Operation
The EL5492C 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 EL5492C will operate on dual supplies ranging from 2.5V to 5V. With single-supply, the EL5492C 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 EL5492C has an input range which extends to within 2V of either supply. So, for example, on 5V supplies, the EL5492C has an input range which spans 3V. The output range of the EL5492C 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.
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 EL5492C 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.
14
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
EL5492C, EL5492AC
Current Limiting
The EL5492C 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.
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 O U TMA X PDMA X = ( 2 x V S x I S MA X ) + ( V S - V OU TMA X ) x ------------------------RL
Power Dissipation
With the high output drive capability of the EL5492C, 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 (T JMAX) for the application to determine if power supply voltages, load conditions, or package type need to be modified for the EL5492C to remain in the safe operating area. These parameters are calculated as follows:
T JM A X = T M AX + ( JA x n x PD M AX )
where: VS = Supply voltage ISMAX = Maximum supply current of 1A VOUTMAX = Maximum output voltage (required) RL = Load resistance
15
EL5492C, EL5492AC
EL5492C, EL5492AC
Quad 600MHz Current Feedback Amplifier with Enable
Effective May 15, 2002, Elantec, a leader in high performance analog products, is now a part of Intersil Corporation. 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
February 28, 2002
(R)
Sales Office Headquarters
NORTH AMERICA Intersil Corporation 7585 Irvine Center Drive Suite 100 Irvine, CA 92618 TEL: 949-341-7000 FAX: 949-341-7123 Elantec 675 Trade Zone Blvd. Milpitas, CA 95035 TEL: 408-945-1323 800: 888-ELANTEC FAX: 408-945-9305 EUROPE Intersil Europe Sarl Avenue William Fraisse 3 1006 Lausanne Switzerland TEL: +41-21-6140560 FAX: +41-21-6140579 ASIA Intersil Corporation Unit 1804 18/F Guangdong Water Bldg. 83 Austin Road TST, Kowloon Hong Kong TEL: +852-2723-6339 FAX: +852-2730-1433
Printed in U.S.A.
16

▲Up To Search▲

Price & Availability of EL5492ACL

	To Download EL5492ACL Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .