a Improved Second Source to the EL2020 ADEL2020 CONNECTION DIAGRAMS FEATURES Ideal for Video Applications 0.02% Differential Gain 0.048 Differential Phase 0.1 dB Bandwidth to 25 MHz (G = +2) High Speed 90 MHz Bandwidth (–3 dB) 500 V/ms 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) 8-Pin Plastic Mini-DIP (N) BAL 1 8 DISABLE –IN 2 7 V+ +IN 3 6 V– 4 5 ADEL2020 TOP VIEW 20-Pin Small Outline Package NC 1 20 BAL 2 19 DISABLE OUTPUT NC 3 18 NC BAL –IN 4 17 V+ NC 5 16 NC +IN 6 15 OUTPUT NC 7 14 NC V– 8 13 BAL 12 NC 11 NC NC 9 NC 10 ADEL2020 TOP VIEW NC NC = NO CONNECT PRODUCT DESCRIPTION The ADEL2020 offers other significant improvements. The most important of these is lower power supply current, 33% less 0.20 0.10 RL = 150 Ω 0.09 ±15V 0 NORMALIZED GAIN – dB The ADEL2020 also features an improved disable feature. The disable time (to high output impedance) is 100 ns with guaranteed break before make. Finally the ADEL2020 is offered in the industrial temperature range of –40°C to +85°C in both plastic DIP and SOIC package. –0.1 DIFFERENTIAL GAIN – % +0.1 than the competition while offering higher output drive. Important specs like voltage noise and offset voltage are less than half of those for the EL2020. ±5V +0.1 RL= 1k 0 ±15V –0.1 ±5V 0.18 GAIN = +2 RF = 750 Ω RL = 150 Ω fC = 3.58MHz 100 IRE MODULATED RAMP 0.08 0.07 0.16 0.14 0.12 0.06 0.10 0.05 GAIN 0.04 0.08 PHASE 0.03 0.06 0.02 0.04 0.01 0.02 0 100k 1M 10M FREQUENCY – Hz 100M Fine-Scale Gain (Normalized) vs. Frequency for Various Supply Voltages. RF = 750 Ω, Gain = +2 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE – ± Volts 13 14 DIFFERENTIAL PHASE – Degrees 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 Ω). 0 15 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 ADEL2020–SPECIFICATIONS (@ T = +258C and V = 615 V dc, R = 150 Ω unless otherwise noted) A Parameter S Conditions Temperature L Min ADEL2020A Typ INPUT OFFSET VOLTAGE 1.5 2.0 7 TMIN–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–TMAX TMIN–TMAX 50 TMIN–TMAX TMIN–TMAX 65 TMIN–TMAX TMIN–TMAX INPUT CHARACTERISTICS +Input Resistance –Input Resistance +Input Capacitance Max Units 7.5 10.0 mV mV µV/°C 64 0.1 1.0 dB µA/V 72 0.05 0.5 dB µA/V 0.5 1 7.5 15 µA µA 1 10 40 2 MΩ Ω pF VO = ± 10 V RL = 400 Ω TMIN–TMAX 1 3.5 MΩ OPEN-LOOP DC VOLTAGE GAIN RL = 400 Ω, VOUT = ± 10 V RL = 100 Ω, VOUT = ± 2.5 V TMIN–TMAX TMIN–TMAX 80 76 100 88 dB dB OUTPUT VOLTAGE SWING Short-Circuit Current Output Current RL = 400 Ω TMIN–TMAX ± 12.0 TMIN–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–TMAX TMIN–TMAX TMIN–TMAX TMIN–TMAX Disable Pin = 0 V 6.8 2.1 290 30 ± 18 10.0 3.0 400 V mA mA µA µA G = +1; RFB = 820 G = +2; RFB = 750 G = +10; RFB = 680 G = +2; RFB = 750 VO = 20 V p-p, RL = 400 Ω RL = 400 Ω, 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/µs 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 Ω 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 Plastic DIP and SOIC . . . . . . . . . . . . . . . –65°C to +125°C Operating Temperature Range . . . . . . . . . . –40°C to +85°C Lead Temperature Range (Soldering 60 sec) . . . . . . +300°C 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 145°C. 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 below. 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-Pin Plastic Package: θJA = 90°C/Watt 20-Pin SOIC Package: θJA = 150°C/Watt 2.4 TOTAL POWER DISSIPATION – Watts 2.2 ESD SUSCEPTIBILITY ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the ADEL2020 features ESD protection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality. 2.0 20-PIN SOIC 1.8 1.6 1.4 8-PIN MINI-DIP 1.2 1.0 0.8 0.6 0.4 –40 +VS –20 0.1µF 0 20 40 60 AMBIENT TEMPERATURE – °C 80 100 Maximum Power Dissipation vs. Temperature 10kΩ 7 1 2 5 ADEL2020 3 4 6 0.1µF –VS Offset Null Configuration ORDERING GUIDE REV. A Model Temperature Range Package Description Package Option ADEL2020AN ADEL2020AR-20 ADEL2020AR-20-REEL –40°C to +85°C –40°C to +85°C –40°C to +85°C 8-Pin Plastic DIP 20-Pin Plastic SOIC 20-Pin Plastic SOIC N-8 R-20 R-20 –3– ADEL2020 1kΩ +VS 0.1µF 7 2 ADEL2020 3 VIN 6 VO RL 0.1µF 4 RT –VS Figure 1. Connection Diagram for AVCL = +1 VS = ±15V –135 –180 0 ±5V –225 –1 GAIN –2 VS = ±15V 0 –45 PHASE VS = ±15V CLOSED-LOOP GAIN – dB CLOSED-LOOP GAIN – dB –90 PHASE SHIFT – Degrees PHASE 1 GAIN = +1 RL = 1k Ω 0 –45 –270 –3 ±5V –4 1 –90 –135 ±5V –180 0 –225 –1 GAIN VS = ±15V –2 PHASE SHIFT – Degrees GAIN = +1 RL = 150 Ω –270 –3 ±5V –4 –5 –5 1 10 1 1000 100 FREQUENCY – MHz Figure 2. Closed-Loop Gain and Phase vs. Frequency, G = + 1, RL = 150 Ω, RF = 1 kΩ for ± 15 V, 910 Ω for ± 5 V 10 100 FREQUENCY – MHz 1000 Figure 3. Closed-Loop Gain and Phase vs. Frequency, G = +1, RL = 1 kΩ, RF = 1 kΩ for ± 15 V, 910 Ω for ± 5 V 110 100 –3dB BANDWIDTH – MHz 90 G = +1 RL = 150Ω VO = 250mV p-p 80 PEAKING ≤ 1dB RF = 750 Ω 70 60 PEAKING ≤ 0.1dB 50 RF = 1kΩ 40 30 RF = 1.5kΩ 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE – ±Volts 16 18 Figure 4. –3 dB Bandwidth vs. Supply Voltage, Gain = +1, RL = 150 Ω –4– REV. A ADEL2020 681Ω +VS 0.1µF 681Ω 7 VIN 2 6 ADEL2020 3 4 VO RL 0.1µF –VS GAIN = –1 180 135 RL = 1kΩ 135 CLOSED-LOOP GAIN – dB 90 VS = ±15V 1 0 45 0 ±5V –45 –1 GAIN –2 PHASE 90 CLOSED-LOOP GAIN – dB RL = 150Ω PHASE PHASE SHIFT – Degrees 180 GAIN = –1 VS = ±15V –3 ±5V –4 VS = ±15V 1 0 ±5V 45 0 PHASE SHIFT – Degrees Figure 5. Connection Diagram for AVCL = –1 –45 –1 GAIN –2 VS = ±15V –3 ±5V –4 –5 –5 1 10 100 FREQUENCY – MHz 1 1000 –3dB BANDWIDTH – MHz 90 G = –1 RL = 150 Ω VO = 250mV p-p PEAKING ≤ 1.0dB 80 RF = 499 Ω 70 60 RF = 681 Ω 50 PEAKING ≤ 0.1dB 40 30 RF = 1k Ω 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE – ± Volts 16 18 Figure 8. –3 dB Bandwidth vs. Supply Voltage, Gain = –1, RL = 150 Ω REV. A 1000 Figure 7. Closed-Loop Gain and Phase vs. Frequency, G = –1, RL = 1 kΩ, RF = 680 Ω for VS = ± 15 V, 620 Ω for ± 5 V Figure 6. Closed-Loop Gain and Phase vs. Frequency, G = –1, RL = 150 Ω, RF = 680 Ω for ± 15 V, 620 Ω for ±5 V 100 10 100 FREQUENCY – MHz –5– ADEL2020 750Ω +VS 0.1µF 7 750Ω 2 6 ADEL2020 VIN 3 4 VO RL 0.1µF RT –VS Figure 9. Connection Diagram for AVCL = +2 CLOSED-LOOP GAIN – dB –90 7 –135 VS = ±15V –180 6 ±5V 5 –225 –90 GAIN –270 4 VS = ±15V 3 2 ±5V 7 1 10 100 FREQUENCY – MHz 1000 VS = ±15V –135 –180 6 ±5V 5 GAIN –225 –270 4 VS = ±15V 3 2 1 1 0 –45 PHASE CLOSED-LOOP GAIN – dB RL = 150Ω PHASE GAIN = +2 RL = 1k Ω PHASE SHIFT – Degrees –45 PHASE SHIFT – Degrees 0 GAIN = +2 ±5V 1 10 100 FREQUENCY – MHz 1000 Figure 11. Closed-Loop Gain and Phase vs. Frequency, G = +2, RL = 1 kΩ, RF = 750 Ω for ± 15 V, 715 Ω for ± 5 V Figure 10. Closed-Loop Gain and Phase vs. Frequency, G = +2, RL = 150 Ω, RF = 750 Ω for ± 15 V, 715 Ω for ± 5 V 110 100 –3dB BANDWIDTH – MHz 90 G = +2 RL = 150 Ω PEAKING ≤ 1.0dB VO = 250mV p-p RF = 500 Ω 80 70 60 RF = 750 Ω 50 PEAKING ≤ 0.1dB 40 RF = 1k Ω 30 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE – ±Volts 16 18 Figure 12. –3 dB Bandwidth vs. Supply Voltage, Gain = +2, RL = 150 Ω –6– REV. A ADEL2020 270Ω +VS 0.1µF 30Ω 7 2 ADEL2020 VIN 3 4 VO 6 RL 0.1µF RT –VS Figure 13. Connection Diagram for AVCL = +10 21 –135 VS = ±15V 20 –180 19 –225 GAIN 18 ±5V PHASE 17 ±5V 16 15 21 10 100 FREQUENCY – MHz 1000 20 –3dB BANDWIDTH – MHz 90 –180 19 –225 ±5V GAIN 18 VS = ±15V 17 ±5V 16 1 10 G = +10 RL = 150 Ω VO = 250mV p-p 80 70 PEAKING ≤ 0.5dB 60 RF = 232Ω 50 40 RF = 442Ω 30 PEAKING ≤ 0.1dB RF = 1k Ω 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE – ±Volts 16 18 Figure 16. –3 dB Bandwidth vs. Supply Voltage, Gain = +10, RL = 150 Ω REV. A –270 100 FREQUENCY – MHz 1000 Figure 15. Closed-Loop Gain and Phase vs. Frequency, G = +10, RL = 1 kΩ Figure 14. Closed-Loop Gain and Phase vs. Frequency, G = +10, RL = 150 kΩ 100 –135 VS = ±15V 15 1 0 –45 –90 –270 VS = ±15V GAIN = +10 RF = 270 Ω RL = 1k Ω PHASE SHIFT – Degrees CLOSED-LOOP GAIN – dB –90 CLOSED-LOOP GAIN – dB PHASE –45 PHASE SHIFT – Degrees 0 GAIN = +10 RF = 270 Ω RL = 150 Ω –7– ADEL2020 10.0 30 CLOSED-LOOP OUTPUT RESISTANCE – Ω OUTPUT VOLTAGE – Volts p-p VS = ±15V 25 20 OUTPUT LEVEL FOR 3% THD 15 10 VS = ±5V 5 0 100k 1M 10M FREQUENCY – Hz GAIN = 2 RF = 715Ω 1.0 VS = ±15V 0.1 0.01 10k 100M 1M FREQUENCY – Hz 10M 100M 10 80 RF = 715 Ω AV = +2 70 60 9 SUPPLY CURRENT – mA POWER SUPPLY REJECTION – dB 100k Figure 20. Closed-Loop Output Resistance vs. Frequency Figure 17. Maximum Undistorted Output Voltage vs. Frequency VS = ±15V 50 VS = ±5V 40 30 CURVES ARE FOR WORST CASE CONDITION WHERE ONE SUPPLY IS VARIED WHILE THE OTHER IS HELD CONSTANT 20 10 10k 100k 1M FREQUENCY – Hz VS = ±15V 8 7 VS = ±5V 6 5 10M 4 –60 100M –20 0 20 40 60 80 100 JUNCTION TEMPERATURE – °C 120 140 1200 100 100 –40 Figure 21. Supply Current vs. Junction Temperature Figure 18. Power Supply Rejection vs. Frequency VS = ±5V TO ±15V RL = 400Ω 1000 Hz Hz 10 10 VOLTAGE NOISE GAIN = –10 SLEW RATE – V/µs INVERTING INPUT CURRENT CURRENT NOISE – pA/ VOLTAGE NOISE – nV/ VS = ±5V 800 GAIN = +10 600 GAIN = +2 400 NONINVERTING INPUT CURRENT 1 10 100 1k FREQUENCY – Hz 10k 200 1 100k 2 4 6 8 10 12 14 SUPPLY VOLTAGE – ±Volts 16 18 Figure 22. Slew Rate vs. Supply Voltage Figure 19. Input Voltage and Current Noise vs. Frequency –8– REV. A ADEL2020 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 peak to peak. The isolation can be restored to the 50 dB level by adding a dummy load (say 150 Ω) 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 kΩ in parallel with a few pF. When grounded, about 50 µA flows out of the disable pin for ± 5 V supplies. GENERAL DESIGN CONSIDERATIONS 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 resistor are used at lower supply voltages. POWER SUPPLY BYPASSING 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 kΩ, the ADEL2020 can be used with open drain logic as well. In this case, the enable time is increased to about 1 µs. 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 µF) will be required to provide the best settling time and lowest distortion. Although the recommended 0.1 µF 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. 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 generally be about 250 ns and is somewhat dependent on the load impedance. 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 Ω is all that is needed to achieve an extremely flat gain response. OFFSET NULLING A 10 kΩ 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 µA 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 kΩ for ± 5 V supplies, 150 kΩ 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 one 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 Ω 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. DISABLE MODE 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 for a 1.5 kΩ 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. Leaving the disable pin disconnected (floating) will leave the part in the enabled state. REV. A –9– ADEL2020 OPERATIONAL AMPLIFIERS HIGH SPEED Slew Rate ≥ 100 V/µs LOW POWER (ISUPPLY < 10 mA) BUFFERS AD9630 BUF-03 Ultralow Distortion AD9620 FET INPUT High Slew Rate ( ≥ 1000 V/µs) AD810 AD844 General Purpose AD817 AD818 AD847 AD848 AD845 OP44 OP160 OP260 (Dual) AD849 AD827 (Dual) OP467 (Quad) ADEL2020 Fast AD843 Precision HIGH SLEW RATE ( ≥ 1000 V/µs) ADEL2020 AD810 AD811 AD844 AD9617 AD9618 OP160 OP260 (Dual) SPECIFIED 0.01% SETTLING AD811 AD817 AD818 AD840 AD841 AD842 AD843 AD845 AD846 AD847 OP467 (Quad) AD846 LOW NOISE (< 10 nV/√Hz) AD810 AD811 AD829 AD844 OP64 OP467 (Quad) VIDEO AD810 AD811 AD817 AD818 DIFFERENCE AMPLIFIER Low Voltage Noise AD810 AD829 OP64 OP467 (Quad) DISABLE FEATURE AD810 OP64 OP160 ADEL2020 FET Input AD829 AD830 OP160 ADEL2020 AD830 OP44 –10– REV. A ADEL2020 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic Mini-DIP (N) Package 8 5 0.25 (6.35) 0.31 (7.87) PIN 1 1 4 0.30 (7.62) REF 0.39 (9.91) MAX 0.035 ±0.01 (0.89 ±0.25) 0.165 ±0.01 (4.19 ±0.25) 0.011 ±0.003 (0.28 ±0.08) 0.18 ±0.03 (4.57 ±0.76) 0.125 (3.18) MIN 0.018 ±0.003 (0.46 ±0.08) 0.10 (2.54) BSC 15° 0° 0.033 (0.84) NOM SEATING PLANE 20-Lead Wide Body SOIC (R) Package 20 11 0.300 (7.60) 0.292 (7.40) PIN 1 0.419 (10.65) 0.394 (10.00) 10 1 0.020 (0.51) x 45° CHAMF 0.512 (13.00) 0.496 (12.60) 0.104 (2.64) 0.093 (2.36) 0.011 (0.28) 0.004 (0.10) 0.050 (1.27) BSC 0.019 (0.48) 0.014 (0.36) 0.010 (0.254) 8° 0° 0.050 (1.27) 0.016 (0.40) 0.450 (11.43) All brand or product names mentioned are trademarks or registered trademarks of their respective holders. REV. A –11– PRINTED IN U.S.A. C1727–24–10/92