View EL5462ISZ-T7_1236613.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
EL5462
Data Sheet February 14, 2005 FN7492.0
500MHz Low Power Current Feedback Amplifier
The EL5462 is a current feedback amplifier with a bandwidth of 500MHz which makes this amplifier ideal for today's high speed video and monitor applications. With a supply current of just 1.5mA per amplifier and the ability to run from a single supply voltage from 5V to 12V, the EL5462 is also ideal for handheld, portable or batterypowered equipment. The EL5462 is available in a 14-pin SO package and operates over the industrial temperature range of -40C to +85C.
Features
* 500MHz -3dB bandwidth * 4000V/s slew rate * 1.5mA supply current per amplifier * Single and dual supply operation, from 5V to 12V supply span * High speed, 1.4GHz product available (EL5167 & EL5167) * High speed, 4mA, 630MHz product available (EL5164 & EL5165) * Pb-free available (RoHS compliant)
Pinout
EL5462 (14-PIN SO) TOP VIEW
OUTA 1 INA- 2 INA+ 3 VS+ 4 INB+ 5 INB- 6 OUTB 7 -+ B +C A -+ D +14 OUTD 13 IND12 IND+ 11 VS10 INC+ 9 INC8 OUTC
Applications
* Battery-powered equipment * Handheld, portable devices * Video amplifiers * Cable drivers * RGB amplifiers * Test equipment * Instrumentation * Current-to-voltage converters
Ordering Information
PART NUMBER EL5462IS EL5462IS-T7 EL5462IS-T13 EL5462ISZ (See Note) EL5462ISZ-T7 (See Note) EL5462ISZ-T13 (See Note) PACKAGE 14-Pin SO 14-Pin SO 14-Pin SO 14-Pin SO (Pb-Free) 14-Pin SO (Pb-Free) 14-Pin SO (Pb-Free) TAPE & REEL 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027
NOTE: Intersil Pb-free 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 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
EL5462
Absolute Maximum Ratings (TA = 25C)
Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . Maximum Voltage between IN+ and IN-, Disabled . . . . . . . . . Current into IN+, IN-, CE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slew Rate from VS+ to VS- . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V 50mA 1.5V 5mA 1V/s Pin Voltages. . . . . . . . . . . . . . . . . . . . . . . . .VS- - 0.5V to VS+ +0.5V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +125C 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 = 400 for AV = 2, RL = 150, TA = 25C unless otherwise specified. CONDITIONS MIN TYP MAX UNIT
DESCRIPTION
AV = +1, RL = 500, RF = 598 AV = +2, RL = 150, RF = 422
500 233 30
MHz MHz MHz 5000 V/s ns nV/Hz pA/Hz pA/Hz %
BW1 SR tS eN iNiN+ dG dP
0.1dB Bandwidth Slew Rate 0.1% Settling Time 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, RL = 100 VOUT = -2.5V to +2.5V, AV = +1 2500
4000 25 3 10 6.5 0.05 0.15
DC PERFORMANCE VOS TCVOS ROL Offset Voltage Input Offset Voltage Temperature Coefficient Transimpedance Measured from TMIN to TMAX 500 -5 1.5 6 1000 +5 mV V/C k
INPUT CHARACTERISTICS CMIR CMRR -ICMR +IIN -IIN RIN CIN Common Mode Input Range Common Mode Rejection Ratio - Input Current Common Mode Rejection + Input Current - Input Current Input Resistance Input Capacitance Guaranteed by CMRR test VIN = 3V 3 50 -1 -8 -10 0.8 3.3 62 0.22 0.5 2 1.6 1 75 +1 +8 +10 3 V dB A/V A A M pF
OUTPUT CHARACTERISTICS VO Output Voltage Swing RL = 150 to GND RL = 1k to GND IOUT Output Current RL = 10 to GND 3.35 3.75 60 3.6 3.9 100 3.75 4.15 V V mA
2
FN7492.0 February 14, 2005
EL5462
Electrical Specifications
PARAMETER SUPPLY ISON PSRR -IPSR NOTE: 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz Supply Current - Enabled, per Amplifier Power Supply Rejection Ratio - Input Current Power Supply Rejection No load, VIN = 0V DC, VS = 4.75V to 5.25V DC, VS = 4.75V to 5.25V 1.3 65 -0.5 1.5 76 0.1 +0.5 1.7 mA dB A/V VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 400 for AV = 2, RL = 150, TA = 25C unless otherwise specified. (Continued) CONDITIONS MIN TYP MAX UNIT
DESCRIPTION
Typical Performance Curves
4 AV=+1 VCC=+5V 2 VEE=-5V RL=500 RF=598 0 4 AV=+4.6 VCC=+5V 2 VEE=-5V RF=375 0
NORMALIZED GAIN (dB)
-2
NORMALIZED GAIN (dB) 1M 10M 100M 1G
-2
-4
-4
-6 10K
100K
-6 100K
1M
10M FREQUENCY (Hz)
100M
1G
FREQUENCY (Hz)
FIGURE 1. FREQUENCY RESPONSE FOR AV=+1
2
FIGURE 2. FREQUENCY RESPONSE FOR AV=+4.6
3
NORMALIZED GAIN (dB)
-2
NORMALIZED GAIN (dB)
0
1
-1
-4 AV=+10 VCC=+5V -6 VEE=-5V RL=150 RF=375 -8 100K 1M
-3 AV=+2 VCC=+5V -5 VEE=-5V RL=150 RF=422 -7 100K 1M
10M FREQUENCY (Hz)
100M
1G
10M FREQUENCY (Hz)
100M
1G
FIGURE 3. FREQUENCY RESPONSE FOR AV=+10
FIGURE 4. FREQUENCY RESPONSE FOR AV=+2
3
FN7492.0 February 14, 2005
EL5462 Typical Performance Curves
3
(Continued)
5
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
1
AV=+1 RL=150 3 RF=698 VCC,VEE=6V 1 VCC,VEE=5V VCC,VEE=4V -3 VCC,VEE=3V VCC,VEE=2.5V 1M 10M FREQUENCY (Hz) 100M 1G
-1
-3 AV=+4 VCC=+5V -5 VEE=-5V RL=150 RF=422 -7 100K 1M
-1
10M FREQUENCY (Hz)
100M
1G
-5 100K
FIGURE 5. FREQUENCY RESPONSE FOR AV=+4
100 OUTPUT IMPEDANCE ()
FIGURE 6. FREQUENCY RESPONSE FOR VARIOUS VCC, VEE
10
AV=+2 VCC=+5V VEE=-5V
INPUT RISE TIME 1.028ns
1V/DIV
1 OUTPUT RISE TIME 2.218ns 2V/DIV AV=+2 VCC=+5V VEE=-5V RL=150
0.1
0.01 10K
100K
1M FREQUENCY (Hz)
10M
100M
4ns/DIV
FIGURE 7. CLOSED LOOP OUTPUT IMPEDANCE
FIGURE 8. OUTPUT RISE TIME
INPUT FALL TIME 1.036ns
1V/DIV
AV=+2 VCC=+5V VEE=-5V RL=150
CH1
CH1=5V CH2=200mV M=100ns
OUTPUT FALL TIME 2.21ns
2V/DIV CH2
4ns/DIV
100ns/DIV
FIGURE 9. OUTPUT FALL TIME
FIGURE 10. TURN ON TIME
4
FN7492.0 February 14, 2005
EL5462 Typical Performance Curves
CH1=5V CH2=200mV M=100ns PSRR (dB) CH1
(Continued)
0
AV=+2 VCC=+5V -20 VEE=-5V RL=150 -40
-60
CH2
-80
100ns/DIV
-100 10
100
1K
10K
100K
1M
10M
100M
FREQUENCY (Hz)
FIGURE 11. TURN OFF TIME
FIGURE 12. PSRR (VCC)
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
POWER DISSIPATION (W)
AV=+2 VCC=+5V -20 VEE=-5V RL=150 PSRR (dB) -40
0
1.4
1.2 1.136W 1 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150
JA =
SO C
88
14
-60
/W
-80
-100 10
100
1K
10K
100K
1M
10M
100M
FREQUENCY (Hz)
AMBIENT TEMPERATURE (C)
FIGURE 13. PSRR (VEE)
FIGURE 14. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
1 POWER DISSIPATION (W)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
0.9 833mW 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 25 50 75 85 100 125 150
SO JA =1 14 2 0 C /W
AMBIENT TEMPERATURE (C)
FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
5
FN7492.0 February 14, 2005
EL5462 Pin Descriptions
EL5462 2, 6, 9, 13 PIN NAME INInverting input FUNCTION EQUIVALENT CIRCUIT
VS+
IN+
IN-
VSCircuit 1
3, 5, 10, 12 11 1, 7, 8, 14
IN+ VSOUT
Non-inverting input Negative supply Output
(See circuit 1)
VS+
OUT
VSCircuit 2
4
VS+
Positive supply
Applications Information
Product Description
The EL5462 is a low power, current-feedback operational amplifier that offers a wide -3dB bandwidth of 500MHz and a low supply current of 1.5mA per amplifier. The EL5462 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 EL5462 does not have the normal gainbandwidth 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 makes the EL5462 the ideal choice for many low-power/high-bandwidth applications such as portable, handheld, or battery-powered equipment.
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.
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 EL5462 has been optimized with a 600 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, a 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
6
FN7492.0 February 14, 2005
EL5462
Feedback Resistor Values
The EL5462 has been designed and specified at a gain of +1 with RF approximately 606. This value of feedback resistor gives 500MHz of -3dB bandwidth at AV = 1 with 0.5dB of peaking. With AV = -2, an RF of approximately 600 gives 300MHz of bandwidth with 1dB of peaking. Since the EL5462 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 EL5462 is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closedloop gains. This feature actually allows the EL5462 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 TBD and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain. dP specifications of 0.1% and 0.1, 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 EL5462 has dG and dP specifications of 0.1% and 0.1.
Output Drive Capability
In spite of its low 1.5mA of supply current, the EL5462 is capable of providing a minimum of 50mA of output current. With a minimum of 50mA of output drive, the EL5462 is capable of driving 50 loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications.
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 EL5462 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.
Supply Voltage Range and Single-Supply Operation
The EL5462 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 they will operate on dual supplies ranging from 2.5V to 5V. With single-supply, the EL5462 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 EL5462 has an input range which extends to within 2V of either supply. So, for example, on +5V supplies, the EL5462 has an input range which spans 3V. The output range of the EL5462 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.
Current Limiting
The EL5462 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 EL5462, 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 EL5462 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 1mA supply current of the EL5462 amplifier. Special circuitry has been incorporated in the EL5462 to reduce the variation of output impedance with current output. This results in dG and
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
7
FN7492.0 February 14, 2005
EL5462
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
where: * VS = Supply voltage * ISMAX = Maximum supply current of 1.5mA * VOUTMAX = Maximum output voltage (required) * RL = Load resistance
Typical Application Circuits
+5V IN+ IN-5V 500 VS+ VS0.1F
OUT 0.1F 5
+5V IN+ IN-5V VIN 500 500 VS+ VS-
0.1F
VOUT 5
OUT 0.1F
FIGURE 16. INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER
500 +5V IN+ IN500 -5V
500 0.1F VS+ VS-
OUT 0.1F
500 VIN
+5V IN+ IN-5V VS+ VS-
0.1F
OUT 0.1F
VOUT
FIGURE 17. FAST-SETTLING PRECISION AMPLIFIER
8
FN7492.0 February 14, 2005
EL5462 SO Package Outline Drawing
NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at
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 9
FN7492.0 February 14, 2005

▲Up To Search▲

Price & Availability of EL5462ISZ-T7

	To Download EL5462ISZ-T7 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .