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EL8108
Data Sheet June 7, 2004 FN7417
PRELIMINARY
Video Distribution Amplifier
The EL8108 is a dual current feedback operational amplifier designed for video distribution solutions. This device features a high drive capability of 450mA while consuming only 5mA of supply current per amplifier and operating from a single 5V to 12V supply. The EL8108 is available in the industry standard 8-pin SO as well as the thermally-enhanced 16-pin QFN package. Both are specified for operation over the full -40C to +85C temperature range. The EL8108 has control pins C0 and C1 for controlling the bias and enable/disable of the outputs. The EL8108 is ideal for driving multiple video loads while maintaining linearity.
Features
* Drives up to 450mA from a +12V supply * 20VP-P differential output drive into 100 * -85dBc typical driver output distortion at full output at 150kHz * -70dBc typical driver output distortion at 3.75MHz * Low quiescent current of 5mA per amplifier * 300MHz bandwidth
Applications
* Video distribution amplifiers
Pinouts
EL8108 (8-PIN SO) TOP VIEW
Ordering Information
PART NUMBER EL8108IS EL8108IS-T7 EL8108IS-T13 EL8108IL EL8108IL-T7 EL8108IL-T13 PACKAGE 8-Pin SO 8-Pin SO 8-Pin SO 16-Pin QFN 16-Pin QFN 16-Pin QFN TAPE & REEL 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0046 MDP0046 MDP0046
OUTA 1 INA- 2 INA+ 3 GND 4
8 VS + + 7 OUTB 6 INB5 INB+
EL8108 (16-PIN QFN) TOP VIEW
16 OUTA 13 OUTB NC INBINB+ C1 C0 8 14 VS+ VS- 7
TABLE 1.
15 NC NC 6
150 1 1 2 2 3 3 2 3 4 5 6
150 0 1 1 2 2 3 0 0 0 0 0
DIFF GAIN 0.03 0.03 0.05 0.06 0.08 0.11 0.04 0.05 0.07 0.08 0.10
DIFF PHASE 0.01 0.01 0.02 0.03 0.03 0.03 0.01 0.02 0.02 0.03 0.03
NC 1 INA- 2 INA+ 3 GND 4
AMP A +
12 AMP B 11 + 10 POWER CONTROL 9 LOGIC
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. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
NC 5
EL8108
Absolute Maximum Ratings (TA = 25C)
VS+ Voltage to Ground . . . . . . . . . . . . . . . . . . . . . . -0.3V to +13.2V VIN+ Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS+ Current into any Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8mA Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA Ambient Operating Temperature Range . . . . . . . . . .-40C to +85C Storage Temperature Range . . . . . . . . . . . . . . . . . .-60C to +150C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
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
VS = 12V, RF = 750, RL = 100 connected to mid supply, TA = 25C, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP MAX UNIT
-3dB Bandwidth
RF = 500, AV = +2 RF = 500, AV = +4
200 150 -72 -83 -70 -60 -50 600 800 1100
MHz MHz dBc dBc dBc dBc V/s
HD
Total Harmonic Distortion, Differential
f = 200kHz, VO = 16VP-P, RL = 50 f = 4MHz, VO = 2VP-P, RL = 100 f = 8MHz, VO = 2VP-P, RL = 100 f = 16MHz, VO = 2VP-P, RL = 100
SR DC PERFORMANCE VOS VOS ROL
Slew Rate, Single-ended
VOUT from -3V to +3V
Offset Voltage VOS Mismatch Transimpedance VOUT from -4.5V to +4.5V
-25 -3 0.7 1.4
+25 +3 2.5
mV mV M
INPUT CHARACTERISTICS IB+ IBIBeN iN Non-Inverting Input Bias Current Inverting Input Bias Current IB- Mismatch Input Noise Voltage -Input Noise Current -5 -20 -18 5 0 6 13 5 +20 +18 A A A nV Hz pA/ Hz
OUTPUT CHARACTERISTICS VOUT Loaded Output Swing (single ended) VS = 6V, RL = 100 to GND VS = 6V, RL = 25 to GND IOUT SUPPLY VS IS (EL8108IS only) Supply Voltage Supply Current, Maximum Setting Single supply All outputs at mid supply 4.5 11 14.3 13 18 V mA Output Current RL = 0 4.8 5 4.7 450 V V mA
SUPPLY (EL8108IL ONLY) IS+ (full power) Positive Supply Current per Amplifier All outputs at 0V, C0 = C1 = 0V All outputs at 0V, C0 = 5V, C1 = 0V All outputs at 0V, C0 = 0V, C1 = 5V All outputs at 0V, C0 = C1 = 5V C0, C1 = 5V C0, C1 = 0V 90 -5 11 7 3.7 14.3 8.9 4.5 0.1 125 18 11 5.5 0.5 160 +5 mA mA mA mA A A
IS+ (medium power) Positive Supply Current per Amplifier IS+ (low power) IS+ (power down) IINH, C0 or C1 IINL, C0 or C1 Positive Supply Current per Amplifier Positive Supply Current per Amplifier C0, C1 Input Current, High C0, C1 Input Current, Low
2
EL8108 Typical Performance Curves
22 VS = 6V, AV = 5 20 RL = 100 DIFF 18 16 GAIN (dB) 14 12 10 8 6 4 2 100K 1M 10M FREQUENCY (Hz) 100M 500M RF = 750 RF = 1k RF = 500 GAIN (dB) RF = 243 22 VS = 6V, AV = 5 20 RL = 100 DIFF 18 16 14 12 10 8 6 4 2 100K 1M 10M FREQUENCY (Hz) 100M 500M RF = 750 RF = 1k RF = 500 RF = 243
FIGURE 1. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (FULL POWER MODE)
FIGURE 2. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (3/4 POWER MODE)
22
VS = 6V, AV = 5 20 RL = 100 DIFF 18 16 GAIN (dB) 14 12 10 8 6 4 2 100K 1M
28 RF = 500
VS = 6V, AV = 10 26 RL = 100 DIFF 24 RF = 243 22 GAIN (dB) 20 18 16 14 12 10 RF = 750 RF = 1k RF = 243
RF = 500
RF = 750 RF = 1k
10M FREQUENCY (Hz)
100M
500M
8 100K
1M
10M FREQUENCY (Hz)
100M
500M
FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (1/2 POWER MODE)
FIGURE 4. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (FULL POWER MODE)
28
VS = 6V, AV = 10 26 RL = 100 DIFF 24 22 GAIN (dB) 20 18 16 14 12 10 8 100K 1M 10M FREQUENCY (Hz) 100M 500M RF = 750 RF = 1k RF = 243 RF = 500 GAIN (dB)
28
VS = 6V, AV = 10 26 RL = 100 DIFF 24 22 20 18 16 14 12 10 8 100K 1M 10M FREQUENCY (Hz) 100M 500M RF = 1k RF = 243 RF = 500 RF = 750
FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (3/4 POWER MODE)
FIGURE 6. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (1/2 POWER MODE)
3
EL8108 Typical Performance Curves
VS=6V 14 A =2 V 12 RL=100 DIFF 10 GAIN (dB) 8 6 4 2 0 -2 100K 1M 10M FREQUENCY (Hz) 100M 500M RF=1k RF=750
(Continued)
VS=6V 8 A =2 V 6 RF=500 4 2 0 -2 -4 -6 -8 100K 1M 10M FREQUENCY (Hz) 100M 500M RL=25 RL=50 RL=150
RF=248 RF=500
FIGURE 7. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF
-50
NORMALIZED GAIN (dB) EL8108IL EL8108IS
FIGURE 8. FREQUENCY RESPONSE FOR VARIOUS RLOAD
VS=6V A =5 -55 V RL=50 DIFF RF=750 -60 HD (dB) -65 -70 -75 -80 -85 3rd HD
-50
VS=6V AV=5 -55 R =50 DIFF L RF=750 -60 HD (dB) -65 -70 -75 3rd HD
EL8108IL EL8108IS
2nd HD 1 2 3 4 5 6 VOP-P (V) 7 8 9
2nd HD -80 1 2 3 4 5 6 VOP-P (V) 7 8 9
FIGURE 9. DISTORTION BETWEEN EL8108IL vs EL8108IS AT 2MHz
FIGURE 10. DISTORTION BETWEEN EL8108IL vs EL8108IS AT 3MHz
-40
VS=6V AV=5 -45 RL=50 DIFF RF=750 -50 HD (dB) -55 -60 -65 -70 -75 1 2 3 4 5 6 VOP-P (V) 3rd HD
-40 EL8108IL EL8108IS
VS=6V AV=5 -45 RL=50 DIFF RF=750 3rd HD HD (dB) -50
EL8108IL EL8108IS
-55 2nd HD -60
2nd HD 7 8 9 -65 1 2 3 4 5 6 VOP-P (V) 7 8 9
FIGURE 11. DISTORTION BETWEEN EL8108IL vs EL8108IS AT 5MHz
FIGURE 12. DISTORTION BETWEEN EL8108IL vs EL8108IS AT 10MHz
4
EL8108 Typical Performance Curves
-70 VS=6V AV=5 -75 R =750 F VOPP=4V -80 HD (dB) -85 3rd HD -90 -95 -100 50 2nd HD HD (dB)
(Continued)
-60 VS=6V AV=5 -65 R =750 F VOPP=4V -70 -75 -80 2nd HD -85 -90 50
3rd HD
60
70
80
90 100 110 RLOAD ()
120
130
140
150
60
70
80
90 100 110 RLOAD ()
120
130
140
150
FIGURE 13. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD @ 2MHz (EL8108IL)
FIGURE 14. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD @ 3MHz (EL8108IL)
-50
VS=6V -55 AV=5 RF=750 -60 VOPP=4V -65 HD (dB) 3rd HD -70 -75 -80 -85 -90 50 60 70 80 90 100 110 RLOAD () 120 130 140 150 2nd HD HD (dB)
-40 -45 -50 -55 -60 -65 -70 -75 -80 50 60 70 80 90 100 110 RLOAD () 120 2nd HD 3rd HD
VS=6V AV=5 RF=750 VOPP=4V
130
140
150
FIGURE 15. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD @ 5MHz (EL8108IL)
FIGURE 16. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD @ 10MHz (EL8108IL)
VS = 6V, AV = 5 22 R = 50 L 20 RF = 750 18 GAIN (dB) 16 14 12 10 8 6 0 100K 1M CL = 0pF CL = 22pF CL = 47pF CL = 33pF
24
VS = 6V, AV = 5 22 RL = 50 20 RF = 750 18 GAIN (dB) 16 14 12 10 8 6 100M 500M 4 100K 1M CL = 12pF CL = 0pF 10M FREQUENCY (Hz) 100M 500M CL = 47pF CL = 39pF
10M FREQUENCY (Hz)
FIGURE 17. FREQUENCY RESPONSE WITH VARIOUS CL
FIGURE 18. FREQUENCY RESPONSE vs VARIOUS CL (3/4 POWER MODE)
5
EL8108 Typical Performance Curves
24 VS = 6V, AV = 5 22 RL = 50 20 RF = 750 18 GAIN (dB) 16 14 12 10 8 6 4 100K 1M 10M FREQUENCY (Hz) 100M 500M -110 10K 100K 1M FREQUENCY (Hz) 10M 100M CL = 12pF CL = 0pF CL = 47pF CL = 37pF
(Continued)
-10 CHANNEL SEPARATION (dB)
-30
-50
-70
A
B B A
-90
FIGURE 19. FREQUENCY RESPONSE WITH VARIOUS CL (1/2 POWER MODE)
FIGURE 20. CHANNEL SEPARATION vs FREQUENCY
-10
10M 3M 200 150 PHASE GAIN 100 PHASE () 50 0 -50 -100 -150 -200
-30
PSRR+ MAGNITUDE () PSRR-
300K 100K 30K 10K 3K 1K
PSRR (dB)
-50
-70
-90
-110 100K
1M
10M FREQUENCY (Hz)
10M
100M 200M
-110
1K
10K
100K 1M FREQUENCY (Hz)
10M
100M
FIGURE 21. PSRR vs FREQUENCY
FIGURE 22. TRANSIMPEDANCE (ROL) vs FREQUENCY
VOLTAGE/CURRENT NOISE (nV/Hz)(nA/Hz)
1000 100 10 1 0.1 IN0.01 0.001 0.0001 10 100 IN+ 1K 10K 100K FREQUENCY (Hz) 1M 10M EN OUTPUT IMPEDANCE () 10
VS = 6V, AV = 1 RF = 750
1
0.1
10K
100K
1M FREQUENCY (Hz)
10M
100M
FIGURE 23. VOLTAGE AND CURRENT NOISE vs FREQUENCY
FIGURE 24. OUTPUT IMPEDANCE vs FREQUENCY
6
EL8108 Typical Performance Curves
150 130 120 110 BW (MHz) 100 90 80 70 60 50 3 3.5 4 1/2 POWER MODE 4.5 VS (V) 5 5.5 6 FULL POWER MODE 3/4 POWER MODE AV = 5, RF = 750, RLOAD = 100 DIFF DIFFERENTIAL GAIN (%)
(Continued)
0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 1 FULL POWER MODE 3/4 POWER MODE 1/2 POWER MODE VS=6V
2 # OF 150 LOADS
3
4
FIGURE 25. DIFFERENTIAL BANDWIDTH vs SUPPLY VOLTAGE
FIGURE 26. DIFFERENTIAL GAIN
0.09 DIFFERENTIAL PHASE (%) 0.08 0.07
16 VS=6V 14 12 FULL POWER MODE IS (mA) 10 8 6 3/4 POWER MODE 4 2 0 1 2 # OF 150 LOADS 3 4 1 2 3 VS (V) 4 5 +IS -IS 6 1/2 POWER MODE 3/4 POWER MODE FULL POWER MODE
0.06 0.05 0.04 0.03 0.02 0.01 1/2 POWER MODE
FIGURE 27. DIFFERENTIAL PHASE
FIGURE 28. SUPPLY CURRENT vs SUPPLY VOLTAGE
1 0 SLEW RATE (V/s) IB+ -1 -2 IB-3 -4 -5
1.8K 1.7K 1.6K 1.5K 1.4K 1.3K 1.2K -50
INPUT BIAS CURRENT (A)
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
150
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 29. INPUT BIAS CURRENT vs TEMPERATURE
FIGURE 30. SLEW RATE vs TEMPERATURE
7
EL8108 Typical Performance Curves
5 4 OFFSET VOLTAGE (mV) 3 2 1 0 -1 -50
(Continued)
3 2.5 2 1.5 1 0.5 0 -50
TRANSIMPEDANCE (M)
-25
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
150
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 31. OFFSET VOLTAGE vs TEMPERATURE
FIGURE 32. TRANSIMPEDANCE vs TEMPERATURE
RLOAD=100 5.05 VS=6V SUPPLY CURRENT (mA) 25 50 75 TEMPERATURE (C) 100 125 150 OUTPUT VOLTAGE (V) 5 4.95 4.9 4.85 4.8 4.75 -50 -25 0
5.1
16 15.5 15 14.5 14 13.5 13 12.5 12 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 150
FIGURE 33. OUTPUT VOLTAGE vs TEMPERATURE
FIGURE 34. SUPPLY CURRENT vs TEMPERATURE
3
AV=5 RF=750 RL=100 DIFF
2 PEAKING (dB)
1
0
-1 2.5
3
3.5
4
4.5
5
5.5
6
VS (V)
FIGURE 35. DIFFERENTIAL PEAKING vs SUPPLY VOLTAGE
8
EL8108 Typical Performance Curves
3.5 POWER DISSIPATION (W) 3 2.5 2 1.5 1 0.5 0 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (C) 1.136W
S O8 110 C /W
(Continued)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (C) 781mW
J SO 60 8
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY (4-LAYER) TEST BOARD
POWER DISSIPATION (W)
A =1
C /W
FIGURE 36. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD - LPP EXPOSED DIEPAD SOLDERED TO PCB PER JESD51-5 4.5 4 POWER DISSIPATION (W)
FIGURE 37. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
1.2 POWER DISSIPATION (W) 1 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
3.5 3 2.5 2 1.5 1 0.5 0
3.125W QFN16 JA=40C/W
833mW QFN16 JA=150C/W
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
FIGURE 38. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
FIGURE 39. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Applications Information
Product Description
The EL8108 is a dual current feedback operational amplifier designed for video distribution solutions. It is a dual current mode feedback amplifier with low distortion while drawing moderately low supply current. It is built using Intersil's proprietary complimentary bipolar process and is offered in industry standard pinouts. Due to the current feedback architecture, the EL8108 closed-loop 3dB bandwidth is dependent on the value of the feedback resistor. First the desired bandwidth is selected by choosing the feedback resistor, RF, and then the gain is set by picking the gain resistor, RG. The curves at the beginning of the Typical Performance Curves section show the effect of varying both RF and RG. The 3dB bandwidth is somewhat dependent on the power supply voltage. 9
Power Supply Bypassing and Printed Circuit Board Layout
As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible, below 1/4". The power supply pins must be well bypassed to reduce the risk of oscillation. A 4.7F tantalum capacitor in parallel with a 0.1F ceramic capacitor is adequate for each supply pin. For good AC performance, parasitic capacitances should be kept to a minimum, especially at the inverting input. This implies keeping the ground plane away from this pin. Carbon resistors are acceptable, while use of wire-wound resistors should not be used because of their parasitic inductance. Similarly, capacitors should be low inductance for best performance.
EL8108
Capacitance at the Inverting Input
Due to the topology of the current feedback amplifier, stray capacitance at the inverting input will affect the AC and transient performance of the EL8108 when operating in the non-inverting configuration. In the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a virtual ground and stray capacitance is therefore not "seen" by the amplifier.
Supply Voltage Range
The EL8108 has been designed to operate with supply voltages from 2.5V to 6V. Optimum bandwidth, slew rate, and video characteristics are obtained at higher supply voltages. However, at 2.5V supplies, the 3dB bandwidth at AV = +5 is a respectable 200MHz.
Single Supply Operation
If a single supply is desired, values from +5V to +12V can be used as long as the input common mode range is not exceeded. When using a single supply, be sure to either 1) DC bias the inputs at an appropriate common mode voltage and AC couple the signal, or 2) ensure the driving signal is within the common mode range of the EL8108.
Feedback Resistor Values
The EL8108 has been designed and specified with RF = 500 for AV = +2. This value of feedback resistor yields extremely flat frequency response with little to no peaking out to 200MHz. As is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. Inversely, larger values of feedback resistor will cause rolloff to occur at a lower frequency. See the curves in the Typical Performance Curves section which show 3dB bandwidth and peaking vs. frequency for various feedback resistors and various supply voltages.
Driving Cables and Capacitive Loads
The EL8108 was designed with driving multiple coaxial cables in mind. With 450mA of output drive and low output impedance, driving six, 75 double terminated coaxial cables to 11V with one EL8108 is practical. 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 EL8108 from the capacitive cable and allow extensive capacitive drive. Other applications may have high capacitive loads without termination resistors. In these applications, an additional small value (5-50) resistor in series with the output will
+5V
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently 3dB bandwidth drop off at high temperature, the EL8108 was designed to have little supply current variations with temperature. An immediate benefit from this is that the 3dB bandwidth does not drop off drastically with temperature.
EL8108
-5V 750 750
10
EL8108 SO Package Outline Drawing
11
EL8108 QFN 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 12

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