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EL5164, EL5165, EL5364
Data Sheet August 10, 2005 FN7389.5
600MHz Current Feedback Amplifiers with Enable
The EL5164, EL5165, and EL5364 are 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 5mA and the ability to run from a single supply voltage from 5V to 12V, the amplifiers are also ideal for hand held, portable or battery-powered equipment. The EL5164 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 EL5165 is offered in the 5-pin SOT-23 package, EL5164 is available in the 6-pin SOT-23 and the industry-standard 8-pin SO packages, and the EL5364 in a 16-pin SO and 16-pin QSOP packages. All operate over the industrial temperature range of -40C to +85C.
Features
* 600MHz -3dB bandwidth * 4700V/s slew rate * 5mA supply current * Single and dual supply operation, from 5V to 12V supply span * Fast enable/disable (EL5164 & EL5364 only) * Available in SOT-23 packages * Dual (EL5264 & EL5265) and triple (EL5362 & EL5363) also available * High speed, 1GHz product available (EL5166 & EL5167) * 300MHz product available (EL5162 family) * Pb-Free plus anneal available (RoHS compliant)
Applications
* Video amplifiers * Cable drivers * RGB amplifiers * Test equipment * Instrumentation * Current to voltage converters
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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. 2004, 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
EL5164, EL5165, EL5364 Ordering Information
PART NUMBER EL5164IS EL5164IS-T7 EL5164IS-T13 EL5164ISZ (See Note) EL5164ISZ-T7 (See Note) EL5164ISZ-T13 (See Note) EL5164IW-T7 EL5164IW-T7A EL5164IWZ-T7 (See Note) EL5164IWZ-T7A (See Note) EL5165IC-T7 EL5165IC-T7A EL5165IW-T7 EL5165IW-T7A EL5165IWZ-T7 (See Note) EL5165IWZ-T7A (See Note) EL5364IS EL5364IS-T7 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) 6-Pin SOT-23 6-Pin SOT-23 6-Pin SOT-23 (Pb-free) 6-Pin SOT-23 (Pb-free) 5-Pin SC-70 5-Pin SC-70 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 (Pb-free) 5-Pin SOT-23 (Pb-free) 16-Pin SO (0.150") 16-Pin SO (0.150") TAPE & REEL 7" 13" 7" 13" 7" (3K pcs) 7" (250 pcs) 7" (3K pcs) 7" (250 pcs) 7" (3K pcs) 7" (250 pcs) 7" (3K pcs) 7" (250 pcs) 7" (3K pcs) 7" (250 pcs) 7" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0038 MDP0038 MDP0038 MDP0038 P5.049 P5.049 MDP0038 MDP0038 MDP0038 MDP0038 MDP0027 MDP0027
Ordering Information (Continued)
PART NUMBER EL5364IS-T13 EL5364ISZ (See Note) EL5364ISZ-T7 (See Note) EL5364ISZ-T13 (See Note) EL5364IU EL5364IU-T7 EL5364IU-T13 EL5364IUZ (See Note) EL5364IUZ-T7 (See Note) EL5364IUZ-T13 (See Note) EL5364IUZA (See Note) EL5364IUZA-T7 (See Note) EL5364IUZA-T13 (See Note) PACKAGE 16-Pin SO (0.150") 16-Pin SO (0.150") (Pb-free) 16-Pin SO (0.150") (Pb-free) 16-Pin SO (0.150") (Pb-free) 16-Pin QSOP 16-Pin QSOP 16-Pin QSOP 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) TAPE & REEL 13" 7" 13" 7" 13" 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040
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.
Pinouts
EL5164 (8-PIN SO) TOP VIEW
NC 1 IN- 2 IN+ 3 VS- 4 + 8 CE 7 VS+ 6 OUT 5 NC
EL5364 (16-PIN SO, QSOP) TOP VIEW
INA+ 1 CEA 2 VS- 3 CEB 4 INB+ 5 + + 16 INA15 OUTA 14 VS+ 13 OUTB 12 INB11 NC + 10 OUTC 9 INC-
EL5165 (5-PIN SOT-23, SC-70) TOP VIEW
OUT 1 VS- 2 IN+ 3 +4 IN5 VS+
NC 6 CEC 7 INC+ 8
EL5164 (6-PIN SOT-23) TOP VIEW
OUT 1 VS- 2 IN+ 3 +6 VS+ 5 CE 4 IN-
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364
Absolute Maximum Ratings (TA = 25C)
Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . 13.2V Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 50mA Pin Voltages . . . . . . . . . . . . . . . . . . . . . . . . . VS- -0.5V to VS+ +0.5V Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 125C Supply Slewrate between VS+ and VS- . . . . . . . . . . . . . 1V/s (Max) Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves 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, VENABLE = VS+ - 1V, TA = 25C unless otherwise specified. CONDITIONS MIN TYP MAX UNIT
DESCRIPTION
AV = +1, RL = 500, RF = 510 AV = +2, RL = 150, RF = 412
600 450 50 3500 3000 4700 4200 15 2.1 13 13 -81 -74 0.01 0.01 7000 6000
MHz MHz MHz V/s V/s ns nV/Hz pA/Hz pA/Hz dBc dBc %
BW1 SR
0.1dB Bandwidth Slew Rate
AV = +2, RL = 150, RF = 412 VOUT = -3V to +3V, AV = +2, RL = 100 (EL5164, EL5165) VOUT = -3V to +3V, AV = +2, RL = 100 (EL5364)
tS eN iNiN+ HD2 HD3 dG dP
0.1% Settling Time Input Voltage Noise IN- Input Current Noise IN+ Input Current Noise
VOUT = -2.5V to +2.5V, AV = +2, RF = RG = 1k f = 1MHz f = 1MHz f = 1MHz 5MHz, 2.5VP-P 5MHz, 2.5VP-P
Differential Gain Error (Note 1) Differential Phase Error (Note 1)
AV = +2 AV = +2
DC PERFORMANCE VOS TCVOS ROL Offset Voltage Input Offset Voltage Temperature Coefficient Transimpedance Measured from TMIN to TMAX 1.1 -5 1.5 6 3 +5 mV V/C M
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 + Input Guaranteed by CMRR test VIN = 3V 3 50 -1 -10 -10 300 3.3 62 0.1 2 2 650 1 75 +1 +10 +10 1200 V dB A/V A A k pF
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364
Electrical Specifications
PARAMETER VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RF = 375 for AV = 2, RL = 150, VENABLE = VS+ - 1V, TA = 25C unless otherwise specified. (Continued) DESCRIPTION CONDITIONS MIN TYP MAX UNIT
OUTPUT CHARACTERISTICS VO Output Voltage Swing RL = 150 to GND RL = 1k to GND IOUT SUPPLY ISON ISOFF+ ISOFFPSRR -IPSR Supply Current - Enabled Supply Current - Disabled, per Amplifier Supply Current - Disabled, 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 No load, VIN = 0V 3.2 0 -25 65 -1 -14 79 0.1 +1 3.5 4.2 +25 0 mA A A dB A/V Output Current RL =10 to GND 3.6 3.9 100 3.8 4.1 140 4.0 4.2 190 V V mA
ENABLE (EL5164 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 = (VS+) -5V 1 -1 VS+ - 1 VS+ - 3 200 800 10 0 +25 +1 ns ns A A V V
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364 Typical Performance Curves
5 4 NORMALIZED GAIN (dB) 3 2 1 0 -1 -2 -3 -4 -5 100K 1M 10M FREQUENCY (Hz) 100M 1G RF=1.5K, CL=0.8pF RF=1.8K, CL=0.8pF RF=2.2K, CL=0.8pF VCC, VEE = 5V AV = +2
RF=1.2K, CL=5pF RF=1.2K, CL=3.5pF RF=1.2K, CL=2.5pF RF=1.2K, CL=0.8pF NORMALIZED GAIN (dB)
5 4 3 2 1 0 -1 -2 -3 -4 -5 100K 1M RF=300, RG=75 RF=360, RG=87 RF=397, RG=97 RF=412, RG=100 RF=560, RG=135 10M FREQUENCY (Hz) 100M 1G VCC, VEE=5V CL=2.5pF AV=+5
RF=220, RG=55 RF=160, RG=41
FIGURE 1. FREQUENCY RESPONSE FOR VARIOUS RF AND CL
FIGURE 2. FREQUENCY RESPONSE FOR VARIOUS RF
6 5 NORMALIZED GAIN (dB) 4 3 2 1 0 -1 -2 -3 -4 100K 1M RF=750 RF=909 RF=1201 10M FREQUENCY (Hz) 100M 1G RF=681 NORMALIZED GAIN (dB) VCC, VEE=5V CL=2.5pF AV=+1 RF=510
6 5 4 3 2 1 0 -1 -2 -3 -4 100K 1M RF=681 RF=866 RF=1.2k RF=1.5k 10M FREQUENCY (Hz) 100M 1G VCC=+5V VEE=-5V CL=5pF AV=+2 RL=150
RF=412 RF=562
FIGURE 3. FREQUENCY RESPONSE FOR VARIOUS RF
FIGURE 4. FREQUENCY RESPONSE FOR VARIOUS RF
5 4 NORMALIZED GAIN (dB) 3 2 1 0 -1 -2 -3 -4 -5 100K 1M 10M VCC, VEE= 6V 5V 4V 3V 2.5V 100M 1G ns RL=150 RF=422 RG=422
AMPLITUDE (V)
INPUT
2V/DIV
OUTPUT
1V/DIV VCC, VEE = 5 V AV = +2 RL = 150
FREQUENCY (Hz)
FIGURE 5. FREQUENCY RESPONSE FOR VARIOUS POWER SUPPLY VOLTAGES
FIGURE 6. RISE TIME (ns)
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364 Typical Performance Curves
(Continued)
0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70
VCC=+5V VEE=-5V AV=+1 DISTORTION (dB)
0 -10 -20 -30 -40 -50 -60 -70 -80 SECOND HARMONIC THIRD HARMONIC THD VCC=+5 V VEE=-5 V AV=+1 VOUT=2VP-P RL=100
VEE VCC
-80 10K
100K
1M
10M
100M
1G
-90
0
10
FREQUENCY (Hz)
20 30 40 FREQUENCY (MHz)
50
60
FIGURE 7. PSRR
FIGURE 8. DISTORTION vs FREQUENCY (AV = +1)
0 -20 DISTORTION (dB) -30 -40 -50 -60 -70 -80 -90 -100 0 THIRD HARMONIC SECOND HARMONIC 10 20 30 40 FREQUENCY (MHz) 50 60 10K THD OUTPUT IMPEDANCE () -10 VCC=+5 V VEE=-5 V AV=+2 VOUT=2VP-P, RL=100 10 1
VCC=+5 V VEE=-5 V AV=+2
0.1 0.01
100K
1M FREQENCY (Hz)
10M
100M
FIGURE 9. DISTORTION vs FREQUENCY (AV = +2)
FIGURE 10. OUTPUT IMPEDANCE
1M VOLTAGE NOISE (nV/Hz)
VCC, VEE=5V
100K VCC, VEE= 6V ROL () 10K 5V 4V 1K 3V 2.5V
10
1
100
0 10 10K 100K 1M 10M 100M 1G 100 1K 10K FREQENCY (Hz) 100K 1M
FREQUENCY (Hz)
FIGURE 11. ROL FOR VARIOUS VCC, VEE
FIGURE 12. VOLTAGE NOISE
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364 Typical Performance Curves
(Continued)
VCC=+5V VEE=-5V CURRENT NOISE (pA) 100
VCC = +5V, VEE = -5V AV = +2 RL = 150
CH1 10 CH2
1 100
1K
10K
100K
FREQUENCY (Hz)
FIGURE 13. CURRENT NOISE
FIGURE 14. TURN ON DELAY
0.003 DIFFERENTIAL GAIN (%) 0.002 0.001 0 -0.001 -0.002 -0.003
PHASE 0.002 0.001 0.00 GAIN -0.001 -0.002 -0.003 VCC = +5V, VEE = -5V AV = +2 TEST FREQUENCY, 3.58MHz -0.004 -0.005 -1V DIFFERENTIAL PHASE ()
CH1
CH2
VCC = +5V VEE = -5V AV = +2 RL = 150
1V
0 DC INPUT
FIGURE 15. TURN OFF DELAY
FIGURE 16. DIFFERENTIAL GAIN/PHASE vs DC INPUT VOLTAGE AT 3.58MHz
-30 -40 NORMALIZED GAIN (dB) -50 -60 -70 -80 -90 -100 -110 -120 -130 10K 100K 1M 10M 100M 1G VCC=+5V VEE=-5V RL=100 RF=860 RG=860 CL=5pF B A
-30 -40 C CROSSTALK (dB) -50 -60 -70 -80 -90 -100 -110 -120 -130 10K 100K 1M 10M 100M 1G A TO B A TO C VCC=+5V VEE=-5V RL=100 RF=422 RG=422
C TO B
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 17. FREQUENCY RESPONSE FOR VARIOUS CHANNELS
FIGURE 18. CHANNEL CROSSTALK BETWEEN CHANNELS
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364 Typical Performance Curves
(Continued)
1.4 POWER DISSIPATION (W) 1.2 1
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.250W SO16 (0.150") JA=80C/W
1.4 POWER DISSIPATION (W) 1.2 1
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
0.8 909mW 0.6 0.4 0.2 0 0 SOT23-5/6 JA=230C/W 25 50 75 85 100 125 150 435mW SO8 JA=110C/W
0.8 893mW 0.6 0.4 0.2 0 0 25 50
QSOP16 JA=112C/W
75 85 100
125
150
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
FIGURE 19. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
FIGURE 20. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
1 0.9 POWER DISSIPATION (W) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
1.2 POWER DISSIPATION (W)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
1 909mW 0.8 0.6 0.4 0.2 0
625mW
SO8 JA=160C/W
633mW
391mW SOT23-5/6 JA=256C/W 0 25 50 75 85 100 125 150
16 =1 (0.1 10 50 C " ) /W QS OP J 16 A =1 58 C /W
JA
SO
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
FIGURE 21. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
FIGURE 22. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364 Pin Descriptions
EL5164 (8-PIN SO) 1, 5 2 4 4 EL5164 (6-PIN SOT-23) EL5165 (5-PIN SOT-23) PIN NAME NC INFUNCTION Not connected Inverting input
VS+
EQUIVALENT CIRCUIT
IN+
IN-
VSCircuit 1
3 4 6
3 2 1
3 2 1
IN+ VSOUT
Non-inverting input Negative supply Output
(See circuit 1)
VS+
OUT
VSCircuit 2
7 8
6 5
5
VS+ CE
Positive supply Chip enable, allowing the pin to float or applying a low logic level will enable the amplifier.
CE VS+
VSCircuit 3
Applications Information
Product Description
The EL5164, EL5165, and EL5364 are current-feedback operational amplifiers that offers a wide -3dB bandwidth of 600MHz and a low supply current of 5mA per amplifier. The EL5164, EL5165, and EL5364 work 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 EL5164, EL5165, and EL5364 do 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 EL5164, EL5165, and EL5364 ideal choices for many low-power/high-bandwidth applications such as portable, handheld, or battery-powered equipment. For varying bandwidth needs, consider the EL5166 and EL5167 with 1GHz on a 8.5mA supply current or the EL5162 and EL5163 with 300MHz on a 1.5mA supply current.
Versions include single, dual, and triple amp packages with 5-pin SOT-23, 16-pin QSOP, and 8-pin 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. 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
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364
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. allows the EL5164, EL5165, and EL5364 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.
Disable/Power-Down
The EL5164 amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 150A. The EL5164 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 EL5164 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 EL5164 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 EL5164, EL5165, and EL5364 have 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 EL5164, EL5165, and EL5364 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 EL5164, EL5165, and EL5364 have an input range which extends to within 2V of either supply. So, for example, on 5V supplies, the EL5164, EL5165, and EL5364 have an input range which spans 3V. The output range of the EL5164, EL5165, and EL5364 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 EL5164, EL5165, and EL5364 have been optimized with a TBD 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 5.5mA supply current of each EL5164, EL5165, and EL5364 amplifiers. Special circuitry has been incorporated in the EL5164, EL5165, and EL5364 to reduce the variation of output impedance with current output. This results in dG and dP specifications of TBD% and TBD, 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 EL5164, EL5165, and EL5364 have dG and dP specifications of 0.01% and 0.01, respectively.
Feedback Resistor Values
The EL5164, EL5165, and EL5364 have been designed and specified at a gain of +2 with RF approximately 412. This value of feedback resistor gives 300MHz of -3dB bandwidth at AV = 2 with 2dB of peaking. With AV = -2, an RF of 300 gives 275MHz of bandwidth with 1dB of peaking. Since the EL5164, EL5165, and EL5364 are current-feedback amplifiers, 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 EL5164, EL5165, and EL5364 are currentfeedback amplifiers, their gain-bandwidth product is not a constant for different closed-loop gains. This feature actually 10
Output Drive Capability
In spite of their low 5.5mA of supply current, the EL5164, EL5165, and EL5364 are capable of providing a minimum of 75mA of output current. With a minimum of 75mA of output drive, the EL5164, EL5165, and EL5364 are capable of driving 50 loads to both rails, making it an excellent
FN7389.5 August 10, 2005
EL5164, EL5165, EL5364
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 EL5164, EL5165, and EL5364 from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a backtermination 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.
Typical Application Circuits
+5V IN+ IN-5V 375 VS+ VS0.1F
OUT 0.1F 5
Current Limiting
The EL5164, EL5165, and EL5364 have no internal currentlimiting 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.
+5V IN+ IN-5V VIN 375 375 VS+ VS-
0.1F
VOUT 5
OUT 0.1F
Power Dissipation
With the high output drive capability of the EL5164, EL5165, and EL5364, 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 EL5164, EL5165, and EL5364 to remain in the safe operating area. These parameters are calculated as follows:
T JMAX = T MAX + ( JA x n x PD MAX )
FIGURE 23. INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER
375 +5V IN+ IN375 -5V
375 0.1F VS+ VS-
OUT 0.1F
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 --------------------------R
L
375 VIN
+5V IN+ IN-5V VS+ VS-
0.1F
OUT 0.1F
VOUT
FIGURE 24. FAST-SETTLING PRECISION AMPLIFIER
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FN7389.5 August 10, 2005
EL5164, EL5165, EL5364
0.1F VS+ VS0.1F VS+ VS-
+5V IN+ IN-5V 375
+5V IN+
OUT IN0.1F 162 0.1F VOUT+ 1k 240 +5V OUT 0.1F 162 0.1F VOUT1k IN+ IN-5V 375 375 -5V
OUT 0.1F
375
+5V IN+ IN-5V VIN 375 375 VS+ VS-
0.1F
0.1F VS+ VS-
OUT 0.1F
VOUT
375 RECEIVER
TRANSMITTER
FIGURE 25. DIFFERENTIAL LINE DRIVER/RECEIVER
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 12
FN7389.5 August 10, 2005

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