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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) PRODUCT DESCRIPTION
BAL -IN +IN V-
1 2 3 4
Improved Second Source to the EL2020 ADEL2020
CONNECTION DIAGRAMS 8-Pin Plastic Mini-DIP (N)
DISABLE V+ OUTPUT BAL
20-Pin Small Outline Package
1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13
8 7 6
NC BAL NC -IN NC +IN NC V- NC NC
NC DISABLE NC V+ NC OUTPUT NC BAL NC NC
ADEL2020
TOP VIEW
5
ADEL2020
TOP VIEW
12 11
NC = NO CONNECT
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 of these is lower power supply current, 33% less
+0.1 0
NORMALIZED GAIN - dB
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. 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 -40C to +85C in both plastic DIP and SOIC package.
0.10 0.20 GAIN = +2 RF = 750 RL = 150 fC = 3.58MHz 100 IRE MODULATED RAMP 0.18 0.16 0.14 0.12 0.10 GAIN PHASE 0.08 0.06 0.04 0.02 0 15
RL = 150 15V 5V
0.09
-0.1
DIFFERENTIAL GAIN - %
0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 5 6 7
+0.1 RL= 1k 0 -0.1 15V 5V
100k
1M
10M FREQUENCY - Hz
100M
8 9 10 11 12 SUPPLY VOLTAGE - Volts
13
14
Fine-Scale Gain (Normalized) vs. Frequency for Various Supply Voltages. RF = 750 , Gain = +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 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
DIFFERENTIAL PHASE - Degrees
ADEL2020-SPECIFICATIONS (@ T = +25 C and V =
A S
15 V dc, RL = 150 unless otherwise noted)
Min ADEL2020A Typ Max Units
Parameter
Conditions
Temperature
INPUT OFFSET VOLTAGE TMIN-TMAX Offset Voltage Drift COMMON-MODE REJECTION VOS Input Current POWER SUPPLY REJECTION VOS Input Current INPUT BIAS CURRENT INPUT CHARACTERISTICS +Input Resistance -Input Resistance +Input Capacitance OPEN-LOOP TRANSRESISTANCE OPEN-LOOP DC VOLTAGE GAIN OUTPUT VOLTAGE SWING Short-Circuit Current Output Current POWER SUPPLY Operating Range Quiescent Current Power-Down Current Disable Pin Current Min Disable Pin Current to Disable DYNAMIC PERFORMANCE 3 dB Bandwidth VO = 10 V RL = 400 RL = 400 , VOUT = 10 V RL = 100 , VOUT = 2.5 V RL = 400 TMIN-TMAX TMIN-TMAX TMIN-TMAX TMIN-TMAX TMIN-TMAX VCM = 10 V TMIN-TMAX TMIN-TMAX VS = 4.5 V to 18 V TMIN-TMAX TMIN-TMAX -Input +Input TMIN-TMAX TMIN-TMAX 1 65 50
1.5 2.0 7 64 0.1 72 0.05 0.5 1 10 40 2 3.5 100 88 13.0 150 60
7.5 10.0
mV mV V/C dB A/V dB A/V A A M pF M dB dB V mA mA
1.0
0.5 7.5 15
1 80 76 12.0 30 3.0
Disable Pin = 0 V
TMIN-TMAX TMIN-TMAX TMIN-TMAX TMIN-TMAX
6.8 2.1 290 30 90 70 30 25 8 500 60 0.02 0.04 2.9 13 1.5 15
18 10.0 3.0 400
V mA mA A A MHz MHz MHz MHz MHz V/s ns % Degree nV/Hz pA/Hz pAHz
0.1 dB Bandwidth Full Power Bandwidth Slew Rate Settling Time to 0.1% Differential Gain Differential Phase INPUT VOLTAGE NOISE INPUT CURRENT NOISE OUTPUT RESISTANCE
Specifications subject to change without notice.
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 f = 1 kHz -IIN, f = 1 kHz +IIN, f = 1 kHz Open Loop (5 MHz)
-2-
REV. A
ADEL2020
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 . . . . . . . . . . . . . . . -65C to +125C Operating Temperature Range . . . . . . . . . . -40C to +85C Lead Temperature Range (Soldering 60 sec) . . . . . . +300C
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: JA = 90C/Watt 20-Pin SOIC Package: JA = 150C/Watt
ABSOLUTE MAXIMUM RATINGS 1
MAXIMUM POWER DISSIPATION
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 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.
2.4 2.2
TOTAL POWER DISSIPATION - Watts
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 -40 8-PIN MINI-DIP 20-PIN SOIC
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.
+VS 0.1F 10k 7 1 2 5 6
-20
0 20 40 60 AMBIENT TEMPERATURE - C
80
100
Maximum Power Dissipation vs. Temperature
ADEL2020
3 4 0.1F
-VS
Offset Null Configuration
ORDERING GUIDE Temperature Range Package Description Package Option
Model
ADEL2020AN ADEL2020AR-20 ADEL2020AR-20-REEL
-40C to +85C -40C to +85C -40C to +85C
8-Pin Plastic DIP 20-Pin Plastic SOIC 20-Pin Plastic SOIC
N-8 R-20 R-20
REV. A
-3-
ADEL2020
1k +VS 0.1F
7 2
ADEL2020
VIN RT -VS 3 4 0.1F
6 RL
VO
Figure 1. Connection Diagram for AVCL = +1
PHASE SHIFT - Degrees
-45 PHASE -90
CLOSED-LOOP GAIN - dB
-45 -90 -135 -180 -225
PHASE VS = 15V
CLOSED-LOOP GAIN - dB
1 0
VS = 15V 5V
-135 -180 -225 -270
1 0 -1 GAIN -2 -3 -4 -5 1 10 5V VS = 15V
5V
-1 GAIN -2 -3 5V -4 -5 1 VS = 15V
-270
10
100 FREQUENCY - MHz
1000
100 FREQUENCY - MHz
1000
Figure 2. Closed-Loop Gain and Phase vs. Frequency, G = + 1, RL = 150 , RF = 1 k for 15 V, 910 for 5 V
110 100 90
-3dB BANDWIDTH - MHz
Figure 3. Closed-Loop Gain and Phase vs. Frequency, G = +1, RL = 1 k, RF = 1 k for 15 V, 910 for 5 V
G = +1 RL = 150 VO = 250mV p-p RF = 750
PEAKING 1dB
80 70 60 50 40 30 20 2 4
PEAKING 0.1dB RF = 1k
RF = 1.5k
6 8 10 12 14 SUPPLY VOLTAGE - Volts
16
18
Figure 4. -3 dB Bandwidth vs. Supply Voltage, Gain = +1, RL = 150
-4-
REV. A
PHASE SHIFT - Degrees
GAIN = +1 RL = 150
0
GAIN = +1 RL = 1k
0
ADEL2020
681 +VS 0.1F 681 VIN 2
7
ADEL2020
3 4 0.1F
6 RL
VO
-VS
Figure 5. Connection Diagram for AVCL = -1
180
GAIN = -1
PHASE SHIFT - Degrees
180 135 90
GAIN = -1 PHASE RL = 150 135 90
RL = 1k PHASE VS = 15V 5V
CLOSED-LOOP GAIN - dB
1 0 -1 GAIN -2 -3 -4 -5 1 10 100 FREQUENCY - MHz 5V VS = 15V
45 0 -45
CLOSED-LOOP GAIN - dB
VS = 15V 5V
1 0 -1 GAIN -2 -3 -4 -5 1 5V VS = 15V
45 0 -45
1000
10 100 FREQUENCY - MHz
1000
Figure 6. Closed-Loop Gain and Phase vs. Frequency, G = -1, RL = 150 , RF = 680 for 15 V, 620 for 5 V
Figure 7. Closed-Loop Gain and Phase vs. Frequency, G = -1, RL = 1 k, RF = 680 for VS = 15 V, 620 for 5 V
100 90
-3dB BANDWIDTH - MHz
G = -1 RL = 150 VO = 250mV p-p PEAKING 1.0dB
80 70 60 50 40 30 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE - Volts 16 18 RF = 1k RF = 681 PEAKING 0.1dB RF = 499
Figure 8. -3 dB Bandwidth vs. Supply Voltage, Gain = -1, RL = 150
REV. A
-5-
PHASE SHIFT - Degrees
ADEL2020
750 +VS 0.1F
750 2
7
ADEL2020
VIN RT -VS 3 4 0.1F
6 RL
VO
Figure 9. Connection Diagram for AVCL = +2
0 RL = 150 -45 -90
PHASE SHIFT - Degrees
-45 -90
PHASE
PHASE
CLOSED-LOOP GAIN - dB
6 5 GAIN 4 VS = 15V 3 2 1 1 5V 5V
-180 -225 -270
CLOSED-LOOP GAIN - dB
7
VS = 15V
-135
7 6 5 GAIN 4 3 2 1 1 5V 10 100 FREQUENCY - MHz VS = 15V
VS = 15V 5V
-135 -180 -225 -270
10
100 FREQUENCY - MHz
1000
1000
Figure 10. Closed-Loop Gain and Phase vs. Frequency, G = +2, RL = 150 , RF = 750 for 15 V, 715 for 5 V
Figure 11. Closed-Loop Gain and Phase vs. Frequency, G = +2, RL = 1 k, RF = 750 for 15 V, 715 for 5 V
110 100 90
-3dB BANDWIDTH - MHz
G = +2 RL = 150 VO = 250mV p-p RF = 500
PEAKING 1.0dB
80 70 60 50 40 30 20
RF = 750
PEAKING 0.1dB
RF = 1k
2
4
6 8 10 12 14 SUPPLY VOLTAGE - Volts
16
18
Figure 12. -3 dB Bandwidth vs. Supply Voltage, Gain = +2, RL = 150
-6-
REV. A
PHASE SHIFT - Degrees
GAIN = +2
GAIN = +2 RL = 1k
0
ADEL2020
270 +VS 0.1F 30 2
7
ADEL2020
VIN RT -VS 3 4 0.1F
6 RL
VO
Figure 13. Connection Diagram for AVCL = +10
PHASE SHIFT - Degrees
-45 -90
-45 -90
PHASE
PHASE
CLOSED-LOOP GAIN - dB
VS = 15V
CLOSED-LOOP GAIN - dB
21 20 19 GAIN 18 17 5V 16 15 VS = 15V
-135 -180 -225
21 VS = 15V 20 19 GAIN 18 17 5V 16 15 1 VS = 15V 5V
-135 -180 -225 -270
5V -270
1
10
100 FREQUENCY - MHz
1000
10
100 FREQUENCY - MHz
1000
Figure 14. Closed-Loop Gain and Phase vs. Frequency, G = +10, RL = 150 k
Figure 15. Closed-Loop Gain and Phase vs. Frequency, G = +10, RL = 1 k
100 90
G = +10 RL = 150 VO = 250mV p-p
-3dB BANDWIDTH - MHz
80 70 60 50 40 30 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE - Volts 16 18 RF = 442 RF = 1k PEAKING 0.1dB PEAKING 0.5dB RF = 232
Figure 16. -3 dB Bandwidth vs. Supply Voltage, Gain = +10, RL = 150
REV. A
-7-
PHASE SHIFT - Degrees
GAIN = +10 RF = 270 RL = 150
0
GAIN = +10 RF = 270 RL = 1k
0
ADEL2020
30 VS = 15V 25
10.0
CLOSED-LOOP OUTPUT RESISTANCE -
OUTPUT VOLTAGE - Volts p-p
GAIN = 2 RF = 715 1.0
VS = 5V
20 OUTPUT LEVEL FOR 3% THD 15
VS = 15V 0.1
10
VS = 5V
5
0 100k
1M 10M FREQUENCY - Hz
100M
0.01 10k
100k
1M FREQUENCY - Hz
10M
100M
Figure 17. Maximum Undistorted Output Voltage vs. Frequency
80 70 60 50 VS = 5V 40 30 20 10 CURVES ARE FOR WORST CASE CONDITION WHERE ONE SUPPLY IS VARIED WHILE THE OTHER IS HELD CONSTANT RF = 715 AV = +2
Figure 20. Closed-Loop Output Resistance vs. Frequency
10
POWER SUPPLY REJECTION - dB
9
SUPPLY CURRENT - mA
VS = 15V
VS = 15V 8
7
VS = 5V
6
5
10k
100k
1M FREQUENCY - Hz
10M
100M
4 -60
-40
-20
0 20 40 60 80 100 JUNCTION TEMPERATURE - C
120
140
Figure 18. Power Supply Rejection vs. Frequency
Figure 21. Supply Current vs. Junction Temperature
100 VS = 5V TO 15V
Hz
100
1200 RL = 400
Hz
1000 GAIN = -10
VOLTAGE NOISE - nV/
SLEW RATE - V/s
INVERTING INPUT CURRENT 10 10
CURRENT NOISE - pA/
800 GAIN = +10
600
VOLTAGE NOISE NONINVERTING INPUT CURRENT 1 10 100 1k FREQUENCY - Hz 10k 1 100k
GAIN = +2 400
200 2 4 6 8 10 12 14 SUPPLY VOLTAGE - Volts 16 18
Figure 19. Input Voltage and Current Noise vs. Frequency
Figure 22. Slew Rate vs. Supply Voltage
-8-
REV. A
ADEL2020
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
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 ) 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 this case, the enable time is increased to about 1 s. 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.
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.
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.
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 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 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 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. 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/s
BUFFERS
AD9630 BUF-03
LOW POWER (ISUPPLY < 10 mA) High Slew Rate ( 1000 V/s)
AD810 AD844 OP160 OP260 (Dual)
HIGH SLEW RATE ( 1000 V/s)
ADEL2020 AD810 AD811 AD844 AD9617 AD9618 OP160 OP260 (Dual)
Ultralow Distortion
AD9620
FET INPUT
AD845 OP44
General Purpose
AD817 AD818 AD847 AD848 AD849 AD827 (Dual) OP467 (Quad) ADEL2020
SPECIFIED 0.01% SETTLING
AD811 AD817 AD818 AD840 AD841 AD842 AD843 AD845 AD846 AD847 OP467 (Quad)
Fast
AD843
Precision
AD846
LOW NOISE (< 10 nV/Hz)
AD810 AD811 AD829 AD844 OP64 OP467 (Quad)
DIFFERENCE AMPLIFIER Low Voltage Noise
AD810 AD829 OP64 OP467 (Quad) AD830
DISABLE FEATURE
AD810 OP64 OP160 ADEL2020
VIDEO
AD810 AD811 AD817 AD818 AD829 AD830 OP160 ADEL2020
FET Input
OP44
-10-
REV. A
ADEL2020
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Plastic Mini-DIP (N) Package
8 PIN 1 1
5 0.25 (6.35) 0.31 (7.87) 4 0.30 (7.62) REF 0.035 0.01 (0.89 0.25)
0.39 (9.91) MAX
0.165 0.01 (4.19 0.25) 0.125 (3.18) MIN 0.018 0.003 (0.46 0.08) 0.10 (2.54) BSC 0.033 (0.84) NOM
0.18 0.03 (4.57 0.76)
0.011 0.003 (0.28 0.08) 15 0
SEATING PLANE
20-Lead Wide Body SOIC (R) Package
20
11
0.300 (7.60) 0.292 (7.40) PIN 1 1 10
0.419 (10.65) 0.394 (10.00)
0.512 (13.00) 0.496 (12.60) 0.104 (2.64) 0.093 (2.36) 0.011 (0.28) 0.004 (0.10) 0.019 (0.48) 0.014 (0.36)
0.020 (0.51) x 45 CHAMF
0.050 (1.27) BSC
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

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