Improved Second Source to the EL2020 ADEL2020 FEATURES Ideal for Video Applications 0.02% Differential Gain 0.04 Differential Phase 0.1 dB Bandwidth to 25 MHz (G = +2) High Speed 90 MHz Bandwidth (-3 dB) 500 V/s Slew Rate 60 ns Settling Time to 0.1% (VO = 10 V Step) Low Noise 2.9 nV/Hz Input Voltage Noise Low Power 6.8 mA Supply Current 2.1 mA Supply Current (Power-Down Mode) High Performance Disable Function Turn-Off Time of 100 ns Input to Output Isolation of 54 dB (Off State) CONNECTION DIAGRAMS 8-Lead PDIP (N) 20-Lead SOIC (R) 8 DISABLE BAL 1 NC 1 BAL 2 20 NC 19 DISABLE -IN 2 7 V+ +IN 3 6 OUTPUT NC 3 5 BAL -IN 4 17 V+ NC 5 16 NC +IN 6 15 OUTPUT NC 7 14 NC V- 8 13 BAL NC 9 12 NC NC 10 11 NC V- 4 ADEL2020 TOP VIEW ADEL2020 TOP VIEW 18 NC NC = NO CONNECT GENERAL DESCRIPTION The ADEL2020 is an improved second source to the EL2020. This op amp improves on all the key dynamic specifications while offering lower power and lower cost. The ADEL2020 offers 50% more bandwidth and gain flatness of 0.1 dB to beyond 25 MHz. In addition, differential gain and phase are less than 0.05% and 0.05 while driving one back terminated cable (150 ). The ADEL2020 offers other significant improvements. The most important is lower power supply current (33% less than the competition) with higher output drive. Important specifications like voltage noise and offset voltage are less than half of those for the EL2020. The ADEL2020 also provides an improved disable feature. The disable time (to high output impedance) is 100 ns with guaranteed break before make. The ADEL2020 is offered for the industrial temperature range of -40C to +85C and comes in both PDIP and SOIC packages. +0.1 DIFFERENTIAL GAIN - % NORMALIZED GAIN - dB 0.08 5V +0.1 RL = 1k 15V -0.1 5V 100k 1M 10M FREQUENCY - Hz GAIN = +2 RF = 750 RL = 150 fC = 3.58MHz 100 IRE MODULATED RAMP 0.09 -0.1 0 0.20 0.10 15V 100M Figure 1. Fine-Scale Gain (Normalized) vs. Frequency for Various Supply Voltages, RF = 750 , Gain = +2 0.07 0.18 0.16 0.14 0.06 0.12 0.05 0.10 0.04 0.08 GAIN PHASE 0.03 0.06 0.02 0.04 0.01 0.02 0 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE - V 13 14 DIFFERENTIAL PHASE - Degrees RL = 150 0 0 15 Figure 2. Differential Gain and Phase vs. Supply Voltage REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved. ADEL2020-SPECIFICATIONS (@ T = 25C, V = 15 V dc, R = 150 , unless otherwise noted.) A Parameter S Conditions L Temperature Min ADEL2020A Typ INPUT OFFSET VOLTAGE 1.5 2.0 7 TMIN to TMAX Offset Voltage Drift COMMON-MODE REJECTION VOS Input Current VCM = 10 V POWER SUPPLY REJECTION VOS Input Current VS = 4.5 V to 18 V INPUT BIAS CURRENT -Input +Input TMIN to TMAX TMIN to TMAX 50 TMIN to TMAX TMIN to TMAX 65 TMIN to TMAX TMIN to TMAX INPUT CHARACTERISTICS +Input Resistance -Input Resistance +Input Capacitance Max Unit 7.5 10.0 mV mV V/C 64 0.1 1.0 dB A/V 72 0.05 0.5 dB A/V 0.5 1 7.5 15 A A 1 10 40 2 M pF VO = 10 V RL = 400 TMIN to TMAX 1 3.5 M OPEN-LOOP DC VOLTAGE GAIN RL = 400 , VOUT = 10 V RL = 100 , VOUT = 2.5 V TMIN to TMAX TMIN to TMAX 80 76 100 88 dB dB OUTPUT VOLTAGE SWING Short-Circuit Current Output Current RL = 400 TMIN to TMAX 12.0 TMIN to TMAX 30 13.0 150 60 V mA mA OPEN-LOOP TRANSRESISTANCE POWER SUPPLY Operating Range Quiescent Current Power-Down Current Disable Pin Current Min Disable Pin Current to Disable DYNAMIC PERFORMANCE 3 dB Bandwidth 3.0 TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX Disable Pin = 0 V 6.8 2.1 290 30 18 10.0 3.0 400 V mA mA A A G = +1; RFB = 820 G = +2; RFB = 750 G = +10; RFB = 680 G = +2; RFB = 750 VO = 20 V p-p, RL = 400 RL = 400 , G = +1 10 V Step, G = -1 f = 3.58 MHz f = 3.58 MHz 90 70 30 25 MHz MHz MHz MHz 8 500 60 0.02 0.04 MHz V/s ns % Degree INPUT VOLTAGE NOISE f = 1 kHz 2.9 nV/Hz INPUT CURRENT NOISE -IIN, f = 1 kHz +IIN, f = 1 kHz 13 1.5 pA/Hz pA/Hz OUTPUT RESISTANCE Open Loop (5 MHz) 15 0.1 dB Bandwidth Full Power Bandwidth Slew Rate Settling Time to 0.1% Differential Gain Differential Phase Specifications subject to change without notice. -2- REV. A ADEL2020 ABSOLUTE MAXIMUM RATINGS 1 MAXIMUM POWER DISSIPATION Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Internal Power Dissipation2 . . . . . . . Observe Derating Curves Output Short Circuit Duration . . . . Observe Derating Curves Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . 6 V Storage Temperature Range PDIP and SOIC . . . . . . . . . . . . . . . . . . . . . -65C to +125C Operating Temperature Range . . . . . . . . . . . -40C to +85C Lead Temperature Range (Soldering 60 sec) . . . . . . . . . 300C The maximum power that can be safely dissipated by the ADEL2020 is limited by the associated rise in junction temperature. For the plastic packages, the maximum safe junction temperature is 145C. If the maximum is exceeded momentarily, proper circuit operation will be restored as soon as the die temperature is reduced. Leaving the device in the overheated condition for an extended period can result in device burnout. To ensure proper operation, it is important to observe the derating curves in figure 4. While the ADEL2020 is internally short circuit protected, this may not be sufficient to guarantee that the maximum junction temperature is not exceeded under all conditions. NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 8-Lead PDIP: JA = 90C/W 20-Lead SOIC Package: JA = 150C/W 2.4 TOTAL POWER DISSIPATION - W 2.2 +VS 0.1F 10k 7 2 1 - 5 ADEL2020 3 + 4 6 0.1F 2.0 1.8 20-LEAD SOIC 1.6 1.4 1.2 8-LEAD PDIP 1.0 0.8 0.6 0.4 -40 -VS -20 Figure 3. Offset Null Configuration 0 20 40 60 AMBIENT TEMPERATURE - C 80 100 Figure 4. Maximum Power Dissipation vs. Temperature ORDERING GUIDE Model Temperature Range Package Description Package Option ADEL2020AN ADEL2020AR-20 ADEL2020AR-20-REEL -40C to +85C -40C to +85C -40C to +85C 8-Lead PDIP 20-Lead SOIC 20-Lead SOIC N-8 R-20 R-20 CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADEL2020 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. REV. A -3- ADEL2020-Typical Performance Characteristics GAIN = +1 RL = 1k 0 -90 VS = 15V -135 1 0 -180 5V -225 -1 GAIN -270 -2 VS = 15V CLOSED-LOOP GAIN - dB PHASE PHASE SHIFT - Degrees -3 -90 1 -135 5V -180 0 -225 -1 GAIN -270 -2 VS = 15V 5V -4 -5 -5 10 100 FREQUENCY - MHz 1 1000 10 100 FREQUENCY - MHz 1 TPC 1. Closed-Loop Gain and Phase vs. Frequency, G = + 1, RL = 150 , RF = 1 k for 15 V, 910 for 5 V 1000 TPC 4. Closed-Loop Gain and Phase vs. Frequency, G = +1, RL = 1 k, RF = 1 k for 15 V, 910 for 5 V 110 110 GAIN = +1 100 RL = 150 VO = 250mV p-p GAIN = -1 100 RL = 150 VO = 250mV p-p PEAKING < 1.0dB 90 90 RF = 750 80 -3dB BANDWIDTH - MHz -3dB BANDWIDTH - MHz VS = 15V PHASE -3 5V -4 70 60 RF = 1k 50 PEAKING < 0.1dB 40 30 RF = 499 80 PEAKING < 1.0dB 70 60 RF = 681 50 PEAKING < 0.1dB 40 30 RF = 1.5k RF = 1k 20 20 10 10 0 2 4 6 8 10 12 14 SUPPLY VOLTAGE - V 16 18 20 0 TPC 2. -3 dB Bandwidth vs. Supply Voltage, Gain = +1, RL = 150 GAIN = -1 RL = 150 2 4 6 8 10 12 14 SUPPLY VOLTAGE - V 16 GAIN = -1 RL = 1k 180 45 0 0 -45 -1 GAIN -2 VS = 15V CLOSED-LOOP GAIN - dB 90 1 5V 20 180 135 PHASE SHIFT - Degrees PHASE VS = 15V 18 TPC 5. -3 dB Bandwidth vs. Supply Voltage, Gain = -1, RL = 150 135 CLOSED-LOOP GAIN - dB 0 -45 -3 PHASE VS = 15V 90 45 1 0 5V 0 -45 -1 GAIN -2 VS = 15V PHASE SHIFT - Degrees CLOSED-LOOP GAIN - dB -45 PHASE SHIFT - Degrees GAIN = +1 RL = 150 -3 5V -4 5V -4 -5 -5 1 10 100 FREQUENCY - MHz 1000 1 TPC 3. Closed-Loop Gain and Phase vs. Frequency, G = -1, RL = 150 , RF = 680 for 15 V, 620 for 5 V 10 100 FREQUENCY - MHz 1000 TPC 6. Closed-Loop Gain and Phase vs. Frequency, G = -1, RL = 1 k, RF = 680 for VS = 15 V, 620 for 5 V -4- REV. A ADEL2020 GAIN = +2 RL = 1k 0 0 -90 VS = 15V -135 7 -180 6 5V -225 5 GAIN -270 4 VS = 15V CLOSED-LOOP GAIN - dB PHASE -45 PHASE SHIFT - Degrees CLOSED-LOOP GAIN - dB -45 3 -90 VS = 15V -135 7 -180 6 5V -225 5 GAIN -270 4 VS = 15V 3 5V 2 5V 2 1 1 10 100 FREQUENCY - MHz 1 1000 10 100 FREQUENCY - MHz 1 TPC 7. Closed-Loop Gain and Phase vs. Frequency, G = +2, RL = 150 , RF = 750 for 15 V, 715 for 5 V 1000 TPC 10. Closed-Loop Gain and Phase vs. Frequency, G = +2, RL = 1 k, RF = 750 for 15 V, 715 for 5 V 110 110 GAIN = +2 100 RL = 150 VO = 250mV p-p GAIN = +10 100 RL = 150 VO = 250mV p-p PEAKING < 1.0dB 90 90 RF = 500 -3dB BANDWIDTH - MHz -3dB BANDWIDTH - MHz PHASE PHASE SHIFT - Degrees GAIN = +2 RL = 150 80 70 60 RF = 750 50 PEAKING < 0.1dB 40 RF = 1k 80 70 PEAKING < 0.5dB 60 RF = 232 50 RF = 442 40 30 30 20 20 PEAKING < 0.1dB RF = 1k 10 10 2 4 6 8 10 12 14 SUPPLY VOLTAGE - V 16 18 0 20 TPC 8. -3 dB Bandwidth vs. Supply Voltage, Gain = +2, RL = 150 GAIN = +10 RF = 270 RL = 150 2 4 6 8 10 12 14 SUPPLY VOLTAGE - V 16 GAIN = +10 RF = 270 RL = 1k 0 VS = 15V 21 -135 20 -180 -225 5V GAIN -270 VS = 15V CLOSED-LOOP GAIN - dB -90 0 -45 PHASE SHIFT - Degrees CLOSED-LOOP GAIN - dB PHASE 18 20 TPC 11. -3 dB Bandwidth vs. Supply Voltage, Gain = +10, RL = 150 -45 19 18 17 PHASE -90 VS = 15V 21 -135 20 -180 -225 19 5V GAIN -270 18 VS = 15V 17 5V 16 5V 16 15 15 1 10 100 FREQUENCY - MHz 1000 1 TPC 9. Closed-Loop Gain and Phase vs. Frequency, G = +10, RL = 150 k REV. A 10 100 FREQUENCY - MHz 1000 TPC 12. Closed-Loop Gain and Phase vs. Frequency, G = +10, RL = 1 k -5- PHASE SHIFT - Degrees 0 ADEL2020 10 30 CLOSED-LOOP OUTPUT RESISTANCE - VS = 15V OUTPUT VOLTAGE - V p-p 25 20 OUTPUT LEVEL FOR 3% THD 15 10 VS = 5V 5 0 100k 1M TPC 13. Maximum Undistorted Output Voltage vs. Frequency 80 70 VS = 5V 1 VS = 15V 0.1 0.01 10k 100M 10M FREQUENCY - Hz GAIN = +2 RF = 715 100k 1M FREQUENCY - Hz 10M 100M TPC 16. Closed-Loop Output Resistance vs. Frequency 10 RF = 715 AV = +2 POWER SUPPLY REJECTION - dB 9 SUPPLY CURRENT - mA 60 VS = 15V 50 VS = 5V 40 30 20 CURVES ARE FOR WORST-CASE CONDITION WHERE ONE SUPPLY IS VARIED WHILE THE OTHER IS HELD CONSTANT VS = 15V 8 VS = 5V 7 6 5 10 0 10k 100k 1M FREQUENCY - Hz 10M 4 -60 100M TPC 14. Power Supply Rejection vs. Frequency 100 -20 0 20 40 60 80 100 JUNCTION TEMPERATURE - C 120 140 TPC 17. Supply Current vs. Junction Temperature 100 VS = 5V TO 15V -40 1200 RL = 400 1100 10 10 VOLTAGE NOISE SLEW RATE - V/s INVERTING INPUT CURRENT GAIN = -10 CURRENT NOISE - pA/ Hz VOLTAGE NOISE - nV/ Hz 1000 900 800 GAIN = +10 700 600 500 GAIN = +2 400 NONINVERTING INPUT CURRENT 1 10 100 1k FREQUENCY - Hz 10k 300 1 100k 200 0 2 4 6 8 10 12 14 16 18 20 SUPPLY VOLTAGE - V TPC 15. Input Voltage and Current Noise vs. Frequency TPC 18. Slew Rate vs. Supply Voltage -6- REV. A ADEL2020 750 1k +VS 2 - 3 + 750 7 ADEL2020 VIN +VS 0.1F 4 - 3 + VIN 0.1F 270 +VS - 3 + +VS 0.1F 30 7 ADEL2020 - 0.1F 7 ADEL2020 RL 4 2 VO 6 VIN 0.1F 3 + VO 6 RL 4 RT 0.1F -VS -VS Figure 6. Connection Diagram for AVCL = -1 REV. A 0.1F Figure 7. Connection Diagram for AVCL = +2 681 2 4 -VS Figure 5. Connection Diagram for AVCL = +1 681 VO 6 RL RT -VS VIN 7 ADEL2020 VO 6 RL RT 2 0.1F Figure 8. Connection Diagram for AVCL = +10 -7- ADEL2020 GENERAL DESIGN CONSIDERATIONS DISABLE MODE The ADEL2020 is a current feedback amplifier optimized for use in high performance video and data acquisition systems. Since it uses a current feedback architecture, its closed-loop bandwidth depends on the value of the feedback resistor. The -3 dB bandwidth is also somewhat dependent on the power supply voltage. Lowering the supplies increases the values of internal capacitances, reducing the bandwidth. To compensate for this, smaller values of feedback resistors are used at lower supply voltages. By pulling the voltage on Pin 8 to common (0 V), the ADEL2020 can be put into a disabled state. In this condition, the supply current drops to less than 2.8 mA, the output becomes a high impedance, and there is a high level of isolation from input to output. In the case of a line driver, for example, the output impedance will be about the same as that for a 1.5 k resistor (the feedback plus gain resistors) in parallel with a 13 pF capacitor (due to the output), and the input to output isolation will be better than 50 dB at 10 MHz. POWER SUPPLY BYPASSING Leaving the disable pin disconnected (floating) will leave the part in the enabled state. Adequate power supply bypassing can be critical when optimizing the performance of a high frequency circuit. Inductance in the power supply leads can contribute to resonant circuits that produce peaking in the amplifier's response. In addition, if large current transients must be delivered to the load, then bypass capacitors (typically greater than 1 F) will be required to provide the best settling time and lowest distortion. Although the recommended 0.1 F power supply bypass capacitors will be sufficient in most applications, more elaborate bypassing (such as using two paralleled capacitors) may be required in some cases. In cases where the amplifier is driving a high impedance load, the input to output isolation will decrease significantly if the input signal is greater than about 1.2 V p-p. The isolation can be restored to the 50 dB level by adding a dummy load (say 150 ) at the amplifier output. This will attenuate the feedthrough signal. (This is not an issue for multiplexer applications where the outputs of multiple ADEL2020s are tied together as long as at least one channel is in the ON state.) The input impedance of the disable pin is about 35 k in parallel with a few pF. When grounded, about 50 A flows out of the disable pin for 5 V supplies. Break-before-make operation is guaranteed by design. If driven by standard CMOS logic, the disable time (until the output is high impedance) is about 100 ns and the enable time (to low impedance output) is about 160 ns. Since it has an internal pullup resistor of about 35 k, the ADEL2020 can be used with open drain logic as well. In that case, the enable time increases to about 1 s. CAPACITIVE LOADS When used with the appropriate feedback resistor, the ADEL2020 can drive capacitive loads exceeding 1000 pF directly without oscillation. Another method of compensating for large load capacitance is to insert a resistor in series with the loop output. In most cases, less than 50 is all that is needed to achieve an extremely flat gain response. If there is a nonzero voltage present on the amplifier's output at the time it is switched to the disabled state, some additional decay time will be required for the output voltage to relax to zero. The total time for the output to go to zero will normally be about 250 ns; it is somewhat dependent on the load impedance. OFFSET NULLING A 10 k pot connected between Pins 1 and 5, with its wiper connected to V+, can be used to trim out the inverting input current (with about 20 A of range). For closed-loop gains above about 5, this may not be sufficient to trim the output offset voltage to zero. Tie the pot's wiper to ground through a large value resistor (50 k for 5 V supplies, 150 k for 15 V supplies) to trim the output to zero at high closed-loop gains. OPERATION AS A VIDEO LINE DRIVER The ADEL2020 is designed to offer outstanding performance at closed-loop gains of 1 or greater. At a gain of 2, the ADEL2020 makes an excellent video line driver. The low differential gain and phase errors and wide -0.1 dB bandwidth are nearly independent of supply voltage and load. For applications requiring widest 0.1 dB bandwidth, it is recommended to use 715 feedback and gain resistors. This will result in about 0.05 dB of peaking and a -0.1 dB bandwidth of 30 MHz on 15 V supplies. -8- REV. A ADEL2020 OUTLINE DIMENSIONS 8-Lead Plastic Dual-in-Line Package [PDIP] (N-8) Dimensions shown in inches and (millimeters) 0.375 (9.53) 0.365 (9.27) 0.355 (9.02) 8 5 1 4 0.295 (7.49) 0.285 (7.24) 0.275 (6.98) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.100 (2.54) BSC 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.015 (0.38) MIN 0.180 (4.57) MAX 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) SEATING PLANE 0.060 (1.52) 0.050 (1.27) 0.045 (1.14) COMPLIANT TO JEDEC STANDARDS MO-095AA CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 20-Lead Standared Small Outline Pacakge [SOIC] Wide Body (R-20) Dimensions shown in millimeters and (inches) 13.00 (0.5118) 12.60 (0.4961) 20 11 7.60 (0.2992) 7.40 (0.2913) 1 2.65 (0.1043) 2.35 (0.0925) 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 10.65 (0.4193) 10.00 (0.3937) 10 1.27 (0.0500) BSC 8 0 0.51 (0.0201) SEATING 0.32 (0.0126) PLANE 0.33 (0.0130) 0.23 (0.0091) 0.75 (0.0295) 45 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-013AC CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN REV. A -9- ADEL2020 Revision History Location Page 1/03--Data Sheet changed from REV. 0 to REV. A. Format updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal 8-Lead PDIP (N) and 20-Lead SOIC (R) updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal OUTLINE DIMENSIONS updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 -10- REV. A -11- -12- PRINTED IN U.S.A. C03445-0-1/03(A)