Analog Devices ADEL2020AR-20-REEL, ADEL2020AR-20, ADEL2020AN Datasheet

Improved Second Source
1
8
4
5
3
6
2
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ADEL2020
TOP VIEW
V+ OUTPUT
BAL
BAL
–IN +IN
V–
DISABLE
V+
OUTPUT
BAL
BAL
–IN
+IN
V–
DISABLE
NCNC
NCNC
NCNC
NCNC
NCNC NCNC
NC = NO CONNECT
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19
ADEL2020
TOP VIEW
a
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% (V
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

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). The ADEL2020 offers other significant improvements. The
most important of these is lower power supply current, 33% less
= 10 V Step)
O
to the EL2020
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP (N) 20-Pin Small Outline Package
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 –40°C to +85°C in both plastic DIP and SOIC package.
+0.1
0
–0.1
+0.1
0
NORMALIZED GAIN – dB
–0.1
100k
1M 100M10M
RL = 150
RL= 1k
FREQUENCY – Hz
±15V
±5V
±15V
±5V
Fine-Scale Gain (Normalized) vs. Frequency for Various Supply Voltages. R
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.
= 750 Ω, Gain = +2
F
0.10
0.09
0.08
0.07
0.06
0.05
0.04
DIFFERENTIAL GAIN – %
0.03
0.02
0.01
0
GAIN
6
5
SUPPLY VOLTAGE – ± Volts
GAIN = +2
= 750
R
F
= 150
R
L
= 3.58MHz
f
C
100 IRE MODULATED RAMP
PHASE
Differential Gain and Phase vs. Supply Voltage
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
DIFFERENTIAL PHASE – Degrees
0.02 0
15
1413121110987
ADEL2020–SPECIFICATIONS
(@ TA = +258C and VS = 615 V dc, RL = 150 unless otherwise noted)
ADEL2020A
Parameter Conditions Temperature Min Typ Max Units
INPUT OFFSET VOLTAGE 1.5 7.5 mV
T
MIN–TMAX
2.0 10.0 mV
Offset Voltage Drift 7 µV/°C
COMMON-MODE REJECTION V
V
OS
±Input Current T
POWER SUPPLY REJECTION V
V
OS
±Input Current T
INPUT BIAS CURRENT –Input T
= ±10 V
CM
= ±4.5 V to ±18 V
S
+Input T
T
MIN–TMAX MIN–TMAX
T
MIN–TMAX MIN–TMAX
MIN–TMAX MIN–TMAX
50 64 dB
0.1 1.0 µA/V
65 72 dB
0.05 0.5 µA/V
0.5 7.5 µA 115µA
INPUT CHARACTERISTICS
+Input Resistance 1 10 M –Input Resistance 40 +Input Capacitance 2pF
OPEN-LOOP TRANSRESISTANCE V
OPEN-LOOP DC VOLTAGE GAIN R
OUTPUT VOLTAGE SWING R
= ±10 V
O
R
= 400 T
L
= 400 , V
L
R
= 100 , V
L
= 400 T
L
= ±10 V T
OUT
= ±2.5 V T
OUT
MIN–TMAX
MIN–TMAX MIN–TMAX
MIN–TMAX
1 3.5 M
80 100 dB 76 88 dB
±12.0 ±13.0 V
Short-Circuit Current 150 mA Output Current T
MIN–TMAX
30 60 mA
POWER SUPPLY
Operating Range ±3.0 ±18 V Quiescent Current T Power-Down Current T Disable Pin Current Disable Pin = 0 V T Min Disable Pin Current to Disable T
MIN–TMAX MIN–TMAX MIN–TMAX MIN–TMAX
6.8 10.0 mA
2.1 3.0 mA 290 400 µA 30 µA
DYNAMIC PERFORMANCE
3 dB Bandwidth G = +1; R
G = +2; R G = +10; R
0.1 dB Bandwidth G = +2; R Full Power Bandwidth V
Slew Rate R
= 20 V p-p,
O
R
= 400 8 MHz
L
= 400 , G = +1 500 V/µs
L
= 820 90 MHz
FB
= 750 70 MHz
FB
= 680 30 MHz
FB
= 750 25 MHz
FB
Settling Time to 0.1% 10 V Step, G = –1 60 ns Differential Gain f = 3.58 MHz 0.02 % Differential Phase f = 3.58 MHz 0.04 Degree
INPUT VOLTAGE NOISE f = 1 kHz 2.9 nV/Hz
INPUT CURRENT NOISE –I
, f = 1 kHz 13 pA/Hz
IN
+I
, f = 1 kHz 1.5 pAHz
IN
OUTPUT RESISTANCE Open Loop (5 MHz) 15
Specifications subject to change without notice.
–2–
REV. A
ADEL2020

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation
2
. . . . . . . Observe Derating Curves
1
Output Short Circuit Duration . . . . Observe Derating Curves
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . ±V
S
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
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
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.
+V
S
0.1µF
10k
7
1
5
ADEL2020
323
4
6
0.1µF

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 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.
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
TOTAL POWER DISSIPATION – Watts
0.6
0.4 –40
8-PIN MINI-DIP
0
–20
AMBIENT TEMPERATURE – °C
20-PIN SOIC
100
80604020
Maximum Power Dissipation vs. Temperature
REV. A
–V
S

Offset Null Configuration

ORDERING GUIDE

Temperature Package Package
Model Range Description Option
ADEL2020AN –40°C to +85°C 8-Pin Plastic DIP N-8 ADEL2020AR-20 –40°C to +85°C 20-Pin Plastic SOIC R-20 ADEL2020AR-20-REEL –40°C to +85°C 20-Pin Plastic SOIC R-20
–3–
ADEL2020
0
–5
–1 –2 –3
–4
1
CLOSED-LOOP GAIN – dB
0 –45 –90
–135
–180
–225
–270
PHASE SHIFT – Degrees
GAIN = +1 R
L
= 1k
PHASE
GAIN
VS = ±15V
±5V
VS = ±15V
±5V
FREQUENCY – MHz
10 1001 1000
+V
1k
7
S
0.1µF
V
IN
323
R
T
Figure 1. Connection Diagram for A
PHASE
1 0
–1
–2 –3 –4
CLOSED-LOOP GAIN – dB
–5
GAIN
VS = ±15V
1
±5V
10 100
FREQUENCY – MHz
GAIN = +1 R
= 150
L
VS = ±15V
±5V
0
–45
–90
–135 –180
–225
–270
1000
Figure 2. Closed-Loop Gain and Phase vs. Frequency, G = + 1, R
= 150 Ω, RF = 1 kΩ for ±15 V, 910 Ω for ±5 V
L
ADEL2020
4
–V
S
PHASE SHIFT – Degrees
6
0.1µF
Figure 3. Closed-Loop Gain and Phase vs. Frequency, G = +1, R
V
O
R
L
= +1
VCL
= 1 kΩ, RF = 1 kΩ for ±15 V, 910 Ω for ±5 V
L
110
G = +1
100
90
80
70
60
50
40
–3dB BANDWIDTH – MHz
30
20
= 150
R
L
V
= 250mV p-p
O
2
RF = 750
RF = 1k
RF = 1.5k
SUPPLY VOLTAGE – ±Volts
PEAKING 1dB
PEAKING 0.1dB
1816141210864
Figure 4. –3 dB Bandwidth vs. Supply Voltage, Gain = +1, R
= 150
L
–4–
REV. A
681
+V
ADEL2020
S
0.1µF
681
V
IN
ADEL2020
323
Figure 5. Connection Diagram for A
180 135
90
45 0
–45
PHASE SHIFT – Degrees
PHASE
1 0
–1
–2 –3 –4
CLOSED-LOOP GAIN – dB
–5
GAIN
VS = ±15V
GAIN = –1
= 150
R
L
VS = ±15V
±5V
±5V
10 1001 1000
FREQUENCY – MHz
Figure 6. Closed-Loop Gain and Phase vs. Frequency, G = –1, R
±
5 V
= 150 Ω, RF = 680 Ω for ±15 V, 620 Ω for
L
–V
7
6
4
0.1µF
S
1 0
–1 –2 –3
–4
CLOSED-LOOP GAIN – dB
–5
VCL
PHASE
GAIN
V
O
R
L
= –1
GAIN = –1 R
VS = ±15V
VS = ±15V
±5V
10 1001 1000
FREQUENCY – MHz
L
±5V
= 1k
Figure 7. Closed-Loop Gain and Phase vs. Frequency, G = –1, R
= 1 kΩ, RF = 680 Ω for VS = ±15 V, 620
L
for ±5 V
180 135
90
45 0
PHASE SHIFT – Degrees
–45
G = –1
100
R
= 150
L
90
80
70
60
50
40
–3dB BANDWIDTH – MHz
30
20
= 250mV p-p
V
O
2
PEAKING 1.0dB
RF = 499
RF = 681
RF = 1k
SUPPLY VOLTAGE – ± Volts
PEAKING 0.1dB
1816141210864
Figure 8. –3 dB Bandwidth vs. Supply Voltage, Gain = –1, R
= 150
L
REV. A
–5–
ADEL2020
750
+V
S
0.1µF
750
ADEL2020
V
IN
323
R
T
Figure 9. Connection Diagram for A
1000
0
–45
–90
–135
–180
–225
PHASE SHIFT – Degrees
–270
PHASE
7 6 5
4 3 2
CLOSED-LOOP GAIN – dB
1
1
GAIN
VS = ±15V
±5V
10 100
FREQUENCY – MHz
GAIN = +2
= 150
R
L
VS = ±15V
±5V
Figure 10. Closed-Loop Gain and Phase vs. Frequency, G = +2, R
= 150 Ω, RF = 750 Ω for ±15 V, 715 Ω for ±5 V
L
7
4
0.1µF
–V
S
7 6 5
4 3 2
CLOSED-LOOP GAIN – dB
1
6
VCL
PHASE
GAIN
1
V
O
R
L
= +2
VS = ±15V
10 100
FREQUENCY – MHz
±5V
GAIN = +2 R
= 1k
L
VS = ±15V
±5V
Figure 11. Closed-Loop Gain and Phase vs. Frequency, G = +2, R
= 1 kΩ, RF = 750 Ω for ±15 V, 715 Ω for ±5 V
L
1000
0
–45
–90
–135
–180
–225
PHASE SHIFT – Degrees
–270
110
G = +2
100
90
80
70
60
50
40
–3dB BANDWIDTH – MHz
30
20
R
= 150
L
VO = 250mV p-p
2
PEAKING 1.0dB
RF = 500
PEAKING 0.1dB
RF = 750
RF = 1k
SUPPLY VOLTAGE – ±Volts
1816141210864
Figure 12. –3 dB Bandwidth vs. Supply Voltage,
= 150
Gain = +2, R
L
–6–
REV. A
270
20
15
19
18 17 16
21
CLOSED-LOOP GAIN – dB
0 –45 –90
–135
–180
–225
–270
PHASE SHIFT – Degrees
FREQUENCY – MHz
10 100
1
1000
GAIN = +10 R
F
= 270
RL = 1k
PHASE
GAIN
VS = ±15V
±5V
VS = ±15V
±5V
+V
ADEL2020
S
0.1µF
30
V
IN
323
R
T
Figure 13. Connection Diagram for A
0
–45
–90
–135 –180
–225
PHASE SHIFT – Degrees
–270
1000
PHASE
21
20
19
18 17 16
CLOSED-LOOP GAIN – dB
15
GAIN
1
VS = ±15V
±5V
10 100
FREQUENCY – MHz
GAIN = +10 R
= 270
F
R
= 150
L
VS = ±15V
±5V
Figure 14. Closed-Loop Gain and Phase vs. Frequency, G = +10, R
= 150 k
L
7
ADEL2020
4
–V
S
R
L
= +10
V
O
6
0.1µF
VCL
Figure 15. Closed-Loop Gain and Phase vs. Frequency,
= 1 k
G = +10, R
L
REV. A
100
G = +10 R
= 150
L
90
VO = 250mV p-p
80
70
60
50
40
–3dB BANDWIDTH – MHz
30
20
2
Figure 16. –3 dB Bandwidth vs. Supply Voltage, Gain = +10, R
RF = 232
RF = 442
RF = 1k
SUPPLY VOLTAGE – ±Volts
= 150
L
PEAKING 0.5dB
PEAKING 0.1dB
1816141210864
–7–
ADEL2020
10
4
140
7
5
–40
6
–60
9
8
120806040 100200
–20
SUPPLY CURRENT – mA
JUNCTION TEMPERATURE – °C
VS = ±15V
VS = ±5V
1200
200
2
400
800
600
1000
181614121086
4
SLEW RATE – V/µs
SUPPLY VOLTAGE – ±Volts
RL = 400
GAIN = –10
GAIN = +10
GAIN = +2
30
25
20
OUTPUT LEVEL FOR 3% THD
15
10
OUTPUT VOLTAGE – Volts p-p
5
0 100k 1M 100M10M
VS = ±15V
VS = ±5V
FREQUENCY – Hz
Figure 17. Maximum Undistorted Output Voltage vs. Frequency
80
RF = 715
70
60
50
40
VS = ±15V
VS = ±5V
= +2
A
V
10.0
GAIN = 2
R
= 715
CLOSED-LOOP OUTPUT RESISTANCE –
0.01
1.0
0.1
10k
F
100k
VS = ±5V
FREQUENCY – Hz
VS = ±15V
100M10M1M
Figure 20. Closed-Loop Output Resistance vs. Frequency
POWER SUPPLY REJECTION – dB
Figure 18. Power Supply Rejection vs. Frequency
100
Hz
10
VOLTAGE NOISE – nV/
1
10
Figure 19. Input Voltage and Current Noise vs. Frequency
30
CURVES ARE FOR WORST CASE
20
CONDITION WHERE ONE SUPPLY IS VARIED WHILE THE OTHER IS
10
HELD CONSTANT
10k
VS = ±5V TO ±15V
100k
100
FREQUENCY – Hz
FREQUENCY – Hz
INVERTING INPUT CURRENT
VOLTAGE NOISE
NONINVERTING INPUT CURRENT
1k
10k
100M10M1M
100
10
CURRENT NOISE – pA/ Hz
1
100k
Figure 21. Supply Current vs. Junction Temperature
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

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 suffi- cient 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.
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 µA 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 µs.
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.

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 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 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/µs
BUFFERS
AD9630 BUF-03
Ultralow Distortion
AD9620
FET INPUT
AD845 OP44
Fast
AD843
LOW NOISE (< 10 nV/Hz)
AD810 AD811 AD829
AD844 OP64 OP467 (Quad)
VIDEO
AD810 AD811 AD817 AD818
AD829 AD830 OP160 ADEL2020
LOW POWER (I
High Slew Rate
( 1000 V/µs)
AD810 AD844
General Purpose
AD817 AD818 AD847 AD848
Precision
AD846
Low Voltage Noise
AD810 AD829 OP64 OP467 (Quad)
FET Input
OP44
SUPPLY
< 10 mA)
OP160 OP260 (Dual)
AD849 AD827 (Dual) OP467 (Quad) ADEL2020
HIGH SLEW RATE ( 1000 V/µs)
AD810 AD811 AD844 AD9617 AD9618 OP160 OP260 (Dual)
ADEL2020
SPECIFIED 0.01% SETTLING
AD811 AD817 AD818 AD840 AD841 AD842
AD843 AD845 AD846 AD847 OP467 (Quad)
DIFFERENCE AMPLIFIER
AD830
DISABLE FEATURE
AD810 OP64 OP160 ADEL2020
–10–
REV. A
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Plastic Mini-DIP (N) Package
ADEL2020
0.300 (7.60)
0.292 (7.40) PIN 1
0.011 (0.28)
0.004 (0.10)
PIN 1
0.165 ±0.01 (4.19 ±0.25)
0.125
(3.18)
MIN
0.018 ±0.003 (0.46 ±0.08)
8
1
0.39 (9.91) MAX
0.10
(2.54)
BSC
4
0.033
(0.84)
NOM
5
0.25
(6.35)
(7.87)
0.035 ±0.01 (0.89 ±0.25)
0.18 ±0.03 (4.57 ±0.76)
SEATING PLANE
0.31
20-Lead Wide Body SOIC (R) Package
20
1
0.512 (13.00)
0.496 (12.60)
BSC
0.450 (11.43)
0.019 (0.48)
0.014 (0.36)
0.050 (1.27)
11
10
0.419 (10.65)
0.394 (10.00)
0.104 (2.64)
0.093 (2.36)
0.30 (7.62)
0.011 ±0.003 (0.28 ±0.08)
15
0.020 (0.51) x 45
0.010
(0.254)
0
REF
°
°
8
°
0
°
CHAMF
°
0.050 (1.27)
0.016 (0.40)
All brand or product names mentioned are trademarks or registered trademarks of their respective holders.
REV. A
–11–
C1727–24–10/92
PRINTED IN U.S.A.
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