EL5160, EL5161, EL5260, EL5261, EL5360 (R) Data Sheet PRELIMINARY FN7387.3 June 1, 2004 200MHz Low-Power Current Feedback Amplifiers Features The EL5160, EL5161, EL5260, EL5261, and EL5360 are current feedback amplifiers with a bandwidth of 200MHz and operate from just 0.75mA supply current. This makes these amplifiers ideal for today's high speed video and monitor applications. * 0.75mA supply current With the ability to run from a single supply voltage from 5V to 10V, these amplifiers are ideal for handheld, portable, or battery-powered equipment. * Available in SOT-23 packages * 200MHz -3dB bandwidth * 1700V/s slew rate * Single and dual supply operation, from 5V to 10V supply span * Fast enable/disable (EL5160, EL5260 & EL5360 only) * Pb-free Available as an Option Applications The EL5160 also incorporates an enable and disable function to reduce the supply current to 14A typical per amplifier. Allowing the CE pin to float or applying a low logic level will enable the amplifier. * Battery-powered equipment * Handheld, portable devices * Video amplifiers The EL5160 is available in the 6-pin SOT-23 and 8-pin SO packages, the EL5161 in 5-pin SOT-23 and SC-70 packages, the EL5260 in the 10-pin MSOP package, the EL5261 in 8-pin SO and MSOP packages, the EL5360 in 16-pin SO and QSOP packages. All operate over the industrial temperature range of -40C to +85C. * Cable drivers * RGB amplifiers * Test equipment * Instrumentation * Current to voltage converters Pinouts NC 1 IN- 2 IN+ 3 + VS- 4 8 CE OUT 1 7 VS+ VS- 2 6 OUT IN+ 3 INA+ 1 INB+ 5 OUT 1 5 CE VS- 2 4 IN- IN+ 3 EL5261 (8-PIN SO, MSOP) TOP VIEW 10 INA+ - VS- 3 CEB 4 + - 6 VS+ 5 VS+ + 4 IN- 5 NC EL5260 (10-PIN MSOP) TOP VIEW CEA 2 EL5161 (5-PIN SOT-23, SC-70) TOP VIEW EL5160 (6-PIN SOT-23) TOP VIEW EL5160 (8-PIN SO) TOP VIEW + - OUTA 1 9 OUTA INA- 2 8 VS+ INA+ 3 7 OUTB 6 INB- VS- 4 8 VS+ 7 OUTB + + 6 INB5 INB+ EL5360 (16-PIN SO, QSOP) TOP VIEW INA+ 1 CEA 2 16 INA+ VS- 3 CEB 4 14 VS+ + - INB+ 5 INC+ 8 1 13 OUTB 12 INB- NC 6 CEC 7 15 OUTA 11 NC + - 10 OUTC 9 INC- 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. EL5160, EL5161, EL5260, EL5261, EL5360 Ordering Information (Continued) Ordering Information PACKAGE TAPE & REEL PKG. DWG. # EL5160IS 8-Pin SO (0.150") - MDP0027 EL5160ISZ (See Note) 8-Pin SO (0.150") (Pb-free) - MDP0027 EL5160IS-T7 8-Pin SO (0.150") 7" MDP0027 EL5160ISZ-T7 (See Note) 8-Pin SO (0.150") (Pb-free) 7" MDP0027 EL5160IS-T13 8-Pin SO (0.150") 13" MDP0027 EL5160ISZ-T13 (See Note) 8-Pin SO (0.150") (Pb-free) 13" MDP0027 EL5160IW-T7 6-Pin SOT-23 7" (3K pcs) MDP0038 EL5160IWZ-T7 (See Note) 6-Pin SOT-23 (Pb-free) 7" (3K pcs) MDP0038 EL5160IW-T7A 6-Pin SOT-23 7" (250 pcs) MDP0038 EL5160IWZ-T7A (See Note) 6-Pin SOT-23 (Pb-free) 7" (250 pcs) MDP0038 EL5161IW-T7 5-Pin SOT-23 7" (3K pcs) MDP0038 EL5161IWZ-T7 (See Note) 5-Pin SOT-23 (Pb-free) 7" (3K pcs) MDP0038 EL5161IW-T7A 5-Pin SOT-23 7" (250 pcs) MDP0038 EL5161IWZ-T7A (See Note) 5-Pin SOT-23 (Pb-free) 7" (250 pcs) MDP0038 EL5161IC-T7 5-Pin SC-70 7" (3K pcs) P5.049 EL5161ICZ-T7 (See Note) 5-Pin SC-70 (Pb-free) 7" (3K pcs) P5.049 EL5161IC-T7A 5-Pin SC-70 7" (250 pcs) P5.049 EL5161ICZ-T7A (See Note) 5-Pin SC-70 (Pb-free) 7" (250 pcs) P5.049 EL5260IY 10-Pin MSOP - MDP0043 EL5260IY-T7 10-Pin MSOP 7" MDP0043 EL5260IY-T13 10-Pin MSOP 13" MDP0043 EL5261IY 8-Pin MSOP - MDP0043 EL5261IY-T7 8-Pin MSOP 7" MDP0043 EL5261IY-T13 8-Pin MSOP 13" MDP0043 EL5261IS 8-Pin SO (0.150") - MDP0027 EL5261IS-T7 8-Pin SO (0.150") 7" MDP0027 EL5261IS-T13 8-Pin SO (0.150") 13" MDP0027 16-Pin SO (0.150") - MDP0027 16-Pin SO (0.150") (Pb-free) - MDP0027 16-Pin SO (0.150") 7" MDP0027 16-Pin SO (0.150") (Pb-free) 7" MDP0027 PART NUMBER EL5360IS EL5360ISZ (See Note) EL5360IS-T7 EL5360ISZ-T7 (See Note) 2 PACKAGE TAPE & REEL PKG. DWG. # 16-Pin SO (0.150") 13" MDP0027 16-Pin SO (0.150") (Pb-free) 13" MDP0027 EL5360IU 16-Pin QSOP - MDP0040 EL5360IUZ (See Note) 16-Pin QSOP (Pb-free) - MDP0040 EL5360IU-T7 16-Pin QSOP 7" MDP0040 EL5360IUZ-T7 (See Note) 16-Pin QSOP (Pb-free) 7" MDP0040 EL5360IU-T13 16-Pin QSOP 13" MDP0040 EL5360IUZ-T13 (See Note) 16-Pin QSOP (Pb-free) 13" MDP0040 PART NUMBER EL5360IS-T13 EL5360ISZ-T13 (See Note) NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B. EL5160, EL5161, EL5260, EL5261, EL5360 3 Absolute Maximum Ratings (TA = 25C) Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . 13.2V Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 50mA Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 125C Pin Voltages . . . . . . . . . . . . . . . . . . . . . . . . VS- - 0.5V to VS+ + 0.5V 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 VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RL = 150, VCE, H = VS+, VCE, L = (VS+) -3V, TA = 25C, Unless Otherwise Specified. PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT AC PERFORMANCE BW -3dB Bandwidth AV = +1, RL = 500 200 MHz AV = +2, RL = 150 125 MHz 10 MHz BW1 0.1dB Bandwidth RL = 100 SR Slew Rate VO = -2.5V to +2.5V, AV = +2, RF = RG = 1k, RL = 100 SR 500 Load tS 0.1% Settling Time eN 900 1700 2500 V/s 1360 V/s 35 ns Input Voltage Noise 4 nV/Hz iN- IN- Input Current Noise 7 pA/Hz iN+ IN+ Input Current Noise 8 pA/Hz VOUT = -2.5V to +2.5V, AV = +2 HD2 5MHz, 2.5VP-P, RL = 150, AV = +2 -74 dBc HD3 5MHz, 2.5VP-P, RL = 150, AV = +2 -50 dBc dG Differential Gain Error (Note 1) AV = +2 0.1 % dP Differential Phase Error (Note 1) AV = +2 0.1 DC PERFORMANCE VOS Offset Voltage TCVOS Input Offset Voltage Temperature Coefficient Measured from TMIN to TMAX ROL Transimpedance 2.5VOUT into 150 -5 1.6 +5 mV 6 V/C 800 2000 k V INPUT CHARACTERISTICS CMIR Common Mode Input Range Guaranteed by CMRR test 3 3.3 CMRR Common Mode Rejection Ratio VIN = 3V 50 62 -ICMR - Input Current Common Mode Rejection +IIN 75 dB -1 +1 A/V + Input Current -4 +4 A -IIN - Input Current -5 +5 A RIN Input Resistance 1.5 15 M CIN Input Capacitance 3 4 1 pF EL5160, EL5161, EL5260, EL5261, EL5360 Electrical Specifications VS+ = +5V, VS- = -5V, RF = 750 for AV = 1, RL = 150, VCE, H = VS+, VCE, L = (VS+) -3V, TA = 25C, Unless Otherwise Specified. (Continued) PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT RL = 150 to GND 3.1 3.4 3.8 V RL = 1k to GND 3.8 4.0 4.2 V Output Current RL = 10 to GND 40 70 140 mA Supply Current - Enabled, per Amplifier No load, VIN = 0V (EL5160, EL5161, EL5260, EL5261) 0.6 0.75 0.85 mA No load, VIN = 0V (EL5360) 0.65 0.8 0.92 mA 0 1 25 A 0 A OUTPUT CHARACTERISTICS VO Output Voltage Swing IOUT SUPPLY ISON ISOFF+ Supply Current - Disabled, per Amplifier ISOFF- Supply Current - Disabled, per Amplifier No load, VIN = 0V -25 -14 PSRR Power Supply Rejection Ratio DC, VS = 4.75V to 5.25V 65 74 -IPSR - Input Current Power Supply Rejection DC, VS = 4.75V to 5.25V -0.5 0.1 dB 0.5 A/V ENABLE (EL5160, EL5260, EL5360 ONLY) tEN Enable Time 600 ns tDIS Disable Time 800 ns ICE, H CE Pin Input High Current CE = VS+ 1 14 25 A ICE, L CE Pin Input Low Current CE = (VS+) - 5V -1 0 1 A NOTE: 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz +2 +3 +1 +2 NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) Typical Performance Curves 0 -1 -2 -3 -4 -5 -6 VCC = +5V VEE = -5V RL = 150 AV = 2 RF = 806 RG = 806 100K 1M 10M 100M FREQENCY (Hz) FIGURE 1. FREQUENCY RESPONSE 4 1G +1 0 -1 -2 VCC = +5V -3 VEE = -5V A =1 -4 RV= 500 L -5 RF = 2800 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 2. FREQUENCY RESPONSE 1G EL5160, EL5161, EL5260, EL5261, EL5360 Typical Performance Curves (Continued) 4 4 RL = 500 RF = 2.7k AV = 1 3 2 6V VCC, VEE = 1 NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 5 0 5V 4V -1 -2 3V 2.5V -3 AV = 2 RL = 150 RF = RG = 762 3 2 1 0 -1 -2 5V 4V -3 -4 3V 2.5V -5 -4 50K 1M 100K 10M 100M 500M 50K 100K FREQUENCY (Hz) 4 3 2 1 1M 10M 100M 500M FREQUENCY (Hz) FIGURE 3. FREQUENCY RESPONSE FOR VARIOUS VCC, VEE NORMALIZED GAIN (dB) 6V VCC, VEE = FIGURE 4. FREQUENCY RESPONSE FOR VARIOUS VCC, VEE VCC = +5V VEE = -5V AV = 10 RL = 500 RF = 560 10M 1M 0 100K -1 -2 10K -3 -4 1K -5 100K 1M 10M 100M 1G 1K 10K 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) FIGURE 5. FREQUENCY RESPONSE VCC = +5V, VEE = -5V, RL = 150, AV = 2, RF = 422, RG = 422 100K OUTPUT 500mV/DIV FIGURE 6. ROL VCC = +5V, VEE = -5V, RL = 150, AV = 2, RF = 422, RG = 422 INPUT 1.00V/DIV OUTPUT OUTPUTFALL 500mV/DIV 500mV/DIV INPUT 1.00V/DIV 4ns/DIV FIGURE 7. FALL TIME 5 4ns/DIV FIGURE 8. RISE TIME 100M 500M EL5160, EL5161, EL5260, EL5261, EL5360 Typical Performance Curves (Continued) VCC = +5V, VEE = -5V VCC = +5V, VEE = -5V CE 5.00V/DIV 200mV/DIV 5.00V/DIV VOUT CE VOUT 200mV/DIV 400ns/DIV 400ns/DIV FIGURE 9. DISABLE DELAY TIME VCC = +5V, VEE = -5V VCC = +5V, VEE = -5V -20 PSSR (dB) -30 VCC -40 -50 -60 -70 VEE -80 100 OUTPUT IMPEDANCE () 0 -10 FIGURE 10. ENABLE DELAY TIME -90 10 1 100m 1K 10K 1M 100K 10M 100M 500M 100K 10K FIGURE 11. PSSR NORMALIZED GAIN (dB) 3 2 1 4 VS = 5V RF = 1.5k RG = 750 RL = 150 3 AV=+2 0 -1 AV=-2 -2 AV=-5 -3 -4 -5 -6 100K 10M 100M FIGURE 12. CLOSED LOOP OUTPUT IMPEDANCE NORMALIZED GAIN (dB) 4 1M FREQUENCY (Hz) FREQUENCY (Hz) 2 1 VS = 5V AV = -1 RG = 768 RL = 150 RF=768 RF=1k 0 -1 RF=1.2k -2 RF=1.5k -3 -4 -5 1M 10M 100M 1G FREQUENCY (Hz) FIGURE 13. FREQUENCY RESPONSE FOR VARIOUS GAIN SETTINGS 6 -6 100K 1M 10M 100M FREQUENCY (Hz) FIGURE 14. FREQUENCY RESPONSE FOR VARIOUS FEEDBACK RESISTORS, AV = -1 1G EL5160, EL5161, EL5260, EL5261, EL5360 Typical Performance Curves NORMALIZED GAIN (dB) 5 VS = 5V RG =RF = 768 RL = 500 3 2 VS = 5V AV = +1 RL = 150 4 AV=-1 1 0 AV=-5 -1 -2 AV=+5 -3 AV=+10 -4 NORMALIZED GAIN (dB) 4 (Continued) -5 3 1 0 -1 RF=2.8k -2 RF=750 -3 -4 -6 100K 1M 10M 100M -5 100K 1G 1M FREQUENCY (Hz) JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1.2 1.250W SO16 (0.150") JA=80C/W 1 0.8 909mW 0.6 SO8 JA=110C/W 0.4 0.2 0 0 25 75 85 100 50 125 1.4 1.2 1 893mW 0.8 QSOP16 JA=112C/W 0.6 0.4 0.2 0 150 0 25 75 85 100 50 125 150 AMBIENT TEMPERATURE (C) FIGURE 17. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 18. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1 JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.9 POWER DISSIPATION (W) 0.45 0.4 435mW 0.35 SOT23-5/6 0.3 JA=230C/W 0.25 0.2 0.15 0.1 870mW 0.8 MSOP8/10 0.7 JA=115C/W 0.6 0.5 0.4 0.3 0.2 0.1 0.05 0 1G JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD AMBIENT TEMPERATURE (C) 0.5 100M FIGURE 16. FREQUENCY RESPONSE FOR VARIOUS FEEDBACK RESISTORS, AV = +1 POWER DISSIPATION (W) POWER DISSIPATION (W) 1.4 10M FREQUENCY (Hz) FIGURE 15. FREQUENCY RESPONSE FOR VARIOUS GAIN SETTINGS POWER DISSIPATION (W) RF=1k 2 0 0 25 75 85 100 50 125 150 AMBIENT TEMPERATURE (C) FIGURE 19. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE 7 0 25 50 75 85 100 125 AMBIENT TEMPERATURE (C) FIGURE 20. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE EL5160, EL5161, EL5260, EL5261, EL5360 Typical Performance Curves JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD POWER DISSIPATION (W) 0.9 909mW 0.8 SO16 (0.150") JA=110C/W 0.7 0.6 1.2 POWER DISSIPATION (W) 1 (Continued) 625mW 0.5 0.4 SO8 JA=160C/W 0.3 0.2 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1 0.8 0.6 QSOP16 JA=158C/W 633mW 0.4 0.2 0.1 0 0 25 75 85 100 50 125 0 150 0 25 FIGURE 21. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE 150 0.6 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 391mW 0.35 0.3 JA 0.25 0.2 SO =2 POWER DISSIPATION (W) POWER DISSIPATION (W) 125 FIGURE 22. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.4 T2 35 6 5 -6 C /W 0.15 0.1 0.05 0 75 85 100 AMBIENT TEMPERATURE (C) AMBIENT TEMPERATURE (C) 0.45 50 0 25 75 85 100 50 125 150 AMBIENT TEMPERATURE (C) FIGURE 23. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE 8 0.5 486mW MSOP8/10 JA=206C/W 0.4 0.3 0.2 0.1 0 0 25 50 75 85 100 125 AMBIENT TEMPERATURE (C) FIGURE 24. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE EL5160, EL5161, EL5260, EL5261, EL5360 Pin Descriptions EL5160 (8-PIN SO) EL5160 EL5161 (6-PIN SOT-23) (5-PIN SOT-23) 1, 5 2 4 4 PIN NAME FUNCTION NC Not connected IN- Inverting input EQUIVALENT CIRCUIT VS+ IN+ IN- VSCircuit 1 3 3 3 IN+ Non-inverting input 4 2 2 VS- Negative supply 6 1 1 OUT Output (See circuit 1) VS+ OUT VSCircuit 2 7 6 8 5 5 VS+ Positive supply CE Chip enable VS+ CE VSCircuit 3 Applications Information Product Description The EL5160, EL5161, EL5260, EL5261, and EL5360 are low power, current-feedback operational amplifiers that offer a wide -3dB bandwidth of 200MHz and a low supply current of 4mA per amplifier. The EL5160, EL5161, EL5260, EL5261, and EL5360 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 currentfeedback topology, the EL5160, EL5161, EL5260, EL5261, and EL5360 do not have the normal gain-bandwidth product associated with voltage-feedback operational amplifiers. Instead, their -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 EL5160, EL5161, EL5260, EL5261, and EL5360 ideal choices for many low-power/high-bandwidth applications such as portable, handheld, or battery-powered equipment. 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. 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 package, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot. EL5160, EL5161, EL5260, EL5261, EL5360 Disable/Power-Down The EL5160 amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 15A. The EL5160 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 EL5160 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 EL5160 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 EL5160, EL5161, EL5260, EL5261, and EL5360 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. Feedback Resistor Values The EL5160, EL5161, EL5260, EL5261, and EL5360 have been designed and specified at a gain of +2 with RF approximately 806. This value of feedback resistor gives 200MHz of -3dB bandwidth at AV = 2 with TBDdB of peaking. With AV = -2, an RF of approximately TBD gives 200MHz of bandwidth with 1dB of peaking. Since the EL5160, EL5161, EL5260, EL5261, and EL5360 are currentfeedback 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 EL5160, EL5161, EL5260, EL5261, and EL5360 are current-feedback amplifiers, their gainbandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5160, EL5161, EL5260, EL5261, and EL5360 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 10 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. Supply Voltage Range and Single-Supply Operation The EL5160, EL5161, EL5260, EL5261, and EL5360 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 EL5160, EL5161, EL5260, EL5261, and EL5360 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 EL5160, EL5161, EL5260, EL5261, and EL5360 have an input range which extends to within 2V of either supply. So, for example, on +5V supplies, the EL5160, EL5161, EL5260, EL5261, and EL5360 have an input range which spans 3V. The output range of the EL5160, EL5161, EL5260, EL5261, and EL5360 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. 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 each EL5160, EL5161, EL5260, EL5261, and EL5360 amplifier. Special circuitry has been incorporated in the EL5160, EL5161, EL5260, EL5261, and EL5360 to reduce the variation of output impedance with current output. This results in dG and 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 EL5160 has dG and dP specifications of 0.1% and 0.1. Output Drive Capability In spite of their low 1mA of supply current, the EL5160, EL5161, EL5260, EL5261, and EL5360 are capable of providing a minimum of 50mA of output current. With a minimum of 50mA of output drive, the EL5160 is capable of driving 50 loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications. EL5160, EL5161, EL5260, EL5261, EL5360 Driving Cables and Capacitive Loads where: 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 EL5160, EL5161, EL5260, EL5261, and EL5360 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. * VS = Supply voltage * ISMAX = Maximum supply current of 0.75mA * VOUTMAX = Maximum output voltage (required) * RL = Load resistance Typical Application Circuits 0.1F +5V IN+ VS+ IN- VS- OUT 0.1F -5V 500 Current Limiting The EL5160, EL5161, EL5260, EL5261, and EL5360 have 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. 0.1F +5V IN+ VS+ IN- Power Dissipation With the high output drive capability of the EL5160, EL5161, EL5260, EL5261, and EL5360, 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 EL5160, EL5161, EL5260, EL5261, and EL5360 to remain in the safe operating area. These parameters are calculated as follows: VS- VIN 500 OUT FIGURE 25. INVERTING 200mA OUTPUT CURRENT DISTRIBUTION AMPLIFIER 500 500 0.1F +5V IN- where: 500 -5V 500 +5V VS+ VS- * JA = Thermal resistance of 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 11 5 500 IN+ * n = Number of amplifiers in the package VOUT 0.1F -5V T JMAX = T MAX + ( JA x n x PD MAX ) * TMAX = Maximum ambient temperature 5 VIN IN+ IN-5V OUT 0.1F 0.1F VS+ VS- OUT VOUT 0.1F FIGURE 26. FAST-SETTLING PRECISION AMPLIFIER EL5160, EL5161, EL5260, EL5261, EL5360 0.1F +5V IN+ VS+ IN- VS- -5V IN+ IN0.1F IN+ VS+ IN- VS- -5V VIN 500 250 OUT VS- -5V 0.1F OUT 0.1F 500 500 VOUT+ 1k 0.1F +5V VS+ OUT 500 0.1F +5V 240 250 VOUT- 0.1F +5V 0.1F IN+ 1k VS+ IN- 0.1F VS- -5V 500 500 TRANSMITTER OUT VOUT 0.1F 500 RECEIVER FIGURE 27. 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