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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 ?2003 analog devices, inc. all rights reserved. adel2020 improved second source to the el2020 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 (? db) 500 v/ s slew rate 60 ns settling time to 0.1% (v o = 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) 1 8 4 5 3 6 2 7 adel2020 v+ output bal bal ?n +in v disable v+ output bal bal ?n +in v disable nc nc nc nc nc nc nc nc nc nc nc nc nc = no connect 1 20 4 17 3 18 5 16 8 13 7 14 6 15 9 12 10 11 2 19 top view adel2020 top view 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 ? ). frequency ?hz +0.1 100k 1m 10m 100m normalized gain ?db 0 ?.1 r l = 150 15v 5v +0.1 0 ?.1 r l = 1k 15v 5v figure 1. fine-scale gain (normalized) vs. frequency for various supply voltages, r f = 750 ? , gain = +2 the adel2020 offers other significant improvements. the most important is lower power supply current (33% less than the competition) with higher output drive. impor tant 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 ?0 c to +85 c and comes in both pdip and soic packages. supply voltage ? v 0.10 515 differential gain ?% 0.08 0.06 0.04 0.02 0 0.09 0.07 0.05 0.03 0.01 67891011121314 0.20 differential phase ?degrees 0.16 0.12 0.08 0.04 0 0.18 0.14 0.10 0.06 0.02 gain = +2 r f = 750 r l = 150 f c = 3.58mhz 100 ire modulated ramp gain phase figure 2. differential gain and phase vs. supply voltage
rev. a e2e adel2020especifications adel2020a parameter conditions temperature min typ max unit input offset voltage 1.5 7.5 mv t min to t max 2.0 10.0 mv offset voltage drift 7 v/ c common-mode rejection v cm = 10 v v os t min to t max 50 64 db input current t min to t max 0.1 1.0 a/v power supply rejection v s = 4.5 v to 18 v v os t min to t max 65 72 db input current t min to t max 0.05 0.5 a/v input bias current einput t min to t max 0.5 7.5 a +input t min to t max 115 a input characteristics +input resistance 1 10 m einput resistance 40 +input capacitance 2pf open-loop transresistance v o = 10 v r l = 400 t min to t max 1 3.5 m open-loop dc voltage gain r l = 400 , v out = 10 v t min to t max 80 100 db r l = 100 , v out = 2.5 v t min to t max 76 88 db output voltage swing r l = 400 t min to t max 12.0 13.0 v short-circuit current 150 ma output current t min to t max 30 60 ma power supply operating range 3.0 18 v quiescent current t min to t max 6.8 10.0 ma power-down current t min to t max 2.1 3.0 ma disable pin current disable pin = 0 v t min to t max 290 400 a min disable pin current to disable t min to t max 30 a dynamic performance 3 db bandwidth g = +1; r fb = 820 90 mhz g = +2; r fb = 750 70 mhz g = +10; r fb = 680 30 mhz 0.1 db bandwidth g = +2; r fb = 750 25 mhz full power bandwidth v o = 20 v p-p, r l = 400 8 mhz slew rate r l = 400 , g = +1 500 v/ s settling time to 0.1% 10 v step, g = e1 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 hz hz hz hz hz
rev. a adel2020 e3e absolute maximum ratings 1 supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 v internal power dissipation 2 . . . . . . . observe derating curves output short circuit duration . . . . observe derating curves common-mode input voltage . . . . . . . . . . . . . . . . . . . . . v s differential input voltage . . . . . . . . . . . . . . . . . . . . . . . . 6 v storage temperature range pdip and soic . . . . . . . . . . . . . . . . . . . . . e65 c to +125 c operating temperature range . . . . . . . . . . . e40 c to +85 c lead temperature range (soldering 60 sec) . . . . . . . . . 300 c notes 1 stresses above those listed under absolute maximum ratings may cause perma- nent 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 = 90 c/w 20-lead soic package: ja = 150 c/w adel2020 2 + 3 4 7 6 1 5 e 0.1 f 10k +v s 0.1 f ev s figure 3. offset null configuration maximum power dissipation the maximum power that can be safely dissipated by the adel2020 is limited by the associated rise in junction tempera- ture. for the plastic packages, the maximum safe junction temperature is 145 c. if the maximum is exceeded momen- tarily, proper circuit operation will be restored as soon as the die temperature is reduced. leaving the device in the over- heated 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. ambient temperature e c 2.4 e40 100 to ta l power dissipation e w 2.0 1.6 1.2 0.8 0.4 2.2 1.8 1.4 1.0 0.6 e20 0 20 4 06080 8-lead pdip 20-lead soic figure 4. maximum power dissipation vs. temperature 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. ordering guide temperature package package model range description option adel2020an e40 c to +85 c 8-lead pdip n-8 adel2020ar-20 e40 c to +85 c 20-lead soic r-20 adel2020ar-20-reel e40 c to +85 c 20-lead soic r-20
rev. a e4e adel2020etypical performance characteristics frequency e mhz 1 1000 closed-loop gain e db 1 e1 e3 e5 0 e2 e4 10 100 0 e90 e180 e45 e135 e225 e270 phase shift e degrees gain = +1 r l = 150 gain phase v s = 15v 5v v s = 15v 5v tpc 1. closed-loop gain and phase vs. frequency, g = + 1, r l = 150 , r f = 1 k for 15 v, 910 for 5 v supply voltage e v 020 e3db bandwidth e mhz 70 50 30 10 60 40 20 gain = +1 r l = 150 v o = 250mv p-p 24681012141618 80 90 100 110 r f = 750 r f = 1k r f = 1.5k peaking < 1.0db peaking < 0.1db tpc 2. e3 db bandwidth vs. supply voltage, gain = +1, r l = 150 frequency e mhz 1 1000 closed-loop gain e db 1 e1 e3 e5 0 e2 e4 10 100 180 90 0 135 45 e45 phase shift e degrees gain = e1 r l = 150 gain phase v s = 15v 5v v s = 15v 5v tpc 3. closed-loop gain and phase vs. frequency, g = e1, r l = 150 , r f = 680 for 15 v, 620 for 5 v frequency e mhz 1 1000 closed-loop gain e db 1 e1 e3 e5 0 e2 e4 10 100 0 e90 e180 e45 e135 e225 e270 phase shift e degrees gain = +1 r l = 1k gain phase v s = 15v 5v v s = 15v 5v tpc 4. closed-loop gain and phase vs. frequency, g = +1, r l = 1 k , r f = 1 k for 15 v, 910 for 5 v supply voltage e v 020 e3db bandwidth e mhz 70 50 30 10 60 40 20 gain = e1 r l = 150 v o = 250mv p-p 24681012141618 80 90 100 110 r f = 499 r f = 681 r f = 1k peaking < 1.0db peaking < 0.1db tpc 5. e3 db bandwidth vs. supply voltage, gain = e1, r l = 150 frequency e mhz 1 1000 closed-loop gain e db 1 e1 e3 e5 0 e2 e4 10 100 180 90 0 135 45 e45 phase shift e degrees gain = e1 r l = 1k gain phase v s = 15v 5v v s = 15v 5v tpc 6. closed-loop gain and phase vs. frequency, g = e1, r l = 1 k , r f = 680 for v s = 15 v, 620 for 5 v
rev. a adel2020 e5e frequency e mhz 1 1000 closed-loop gain e db 5 3 1 6 4 2 10 100 0 e90 e180 e45 e135 e225 phase shift e degrees gain = +2 r l = 150 gain phase v s = 15v 5v v s = 15v 5v e270 7 tpc 7. closed-loop gain and phase vs. frequency, g = +2, r l = 150 , r f = 750 for 15 v, 715 for 5 v supply voltage e v 020 e3db bandwidth e mhz 70 50 30 10 60 40 20 gain = +2 r l = 150 v o = 250mv p-p 24681012141618 80 90 100 110 r f = 500 r f = 750 r f = 1k peaking < 1.0db peaking < 0.1db tpc 8. e3 db bandwidth vs. supply voltage, gain = +2, r l = 150 frequency e mhz 1 1000 closed-loop gain e db 19 17 15 20 18 16 10 100 0 e90 e180 e45 e135 e225 phase shift e degrees gain = +10 r f = 270 r l = 150 gain phase v s = 15v 5v v s = 15v 5v e270 21 tpc 9. closed-loop gain and phase vs. frequency, g = +10, r l = 150 k frequency e mhz 1 1000 closed-loop gain e db 5 3 1 6 4 2 10 100 0 e90 e180 e45 e135 e225 phase shift e degrees gain = +2 r l = 1k gain phase v s = 15v 5v v s = 15v 5v e270 7 tpc 10. closed-loop gain and phase vs. frequency, g = +2, r l = 1 k , r f = 750 for 15 v, 715 for 5 v supply voltage e v 020 e3db bandwidth e mhz 70 50 30 10 60 40 20 gain = +10 r l = 150 v o = 250mv p-p 24681012141618 80 90 100 110 r f = 232 r f = 442 r f = 1k peaking < 0.5db peaking < 0.1db tpc 11. e3 db bandwidth vs. supply voltage, gain = +10, r l = 150 frequency e mhz 1 1000 closed-loop gain e db 19 17 15 20 18 16 10 100 0 e90 e180 e45 e135 e225 phase shift e degrees gain = +10 r f = 270 r l = 1k gain phase v s = 15v 5v v s = 15v 5v e270 21 tpc 12. closed-loop gain and phase vs. fre- quency, g = +10, r l = 1 k
rev. a e6e adel2020 frequency e hz 100k 100m output voltage e v p-p 20 10 0 25 15 5 1m 10m 30 output level for 3% thd v s = 5v v s = 15v tpc 13. maximum undistorted output voltage vs. frequency frequency e hz 10k 100m power supply rejection e db 50 20 0 70 30 10 1m 10m 80 40 60 100k curves are for worst-case condition where one supply is varied while the ot her is held constant v s = 15v v s = 5v r f = 715 a v = +2 tpc 14. power supply rejection vs. frequency frequency e hz 10 100k vo ltag e noise e nv/ hz 1 10 1k 10k 100 100 current noise e pa/ hz 1 10 100 v s = 5v to 15v inverting input current vo lta ge noise noninverting input current tpc 15. input voltage and current noise vs. frequency frequency e hz 10k 100m closed-loop output resistance e 0.01 0.1 1m 10m 10 100k 1 v s = 15v v s = 5v gain = +2 r f = 715 tpc 16. closed-loop output resistance vs. frequency junction temperature e c e60 140 supply current e ma 8 6 4 9 7 5 e40 e20 0 20 40 60 80 100 120 10 v s = 15v v s = 5v tpc 17. supply current vs. junction temperature supply voltage e v 020 slew rate e v/ s 800 400 200 1000 600 300 24681012141618 1200 700 900 500 1100 r l = 400 gain = +10 gain = +2 gain = e10 tpc 18. slew rate vs. supply voltage
rev. a adel2020 e7e adel2020 2 + 3 4 6 e 0.1 f ev s r t 7 +v s 0.1 f r l v o 1k v in figure 5. connection diagram for a vcl = +1 adel2020 2 + 3 4 6 e 0.1 f ev s 7 +v s 0.1 f r l v o 681 v in 681 figure 6. connection diagram for a vcl = e1 adel2020 2 + 3 4 6 e 0.1 f ev s 7 +v s 0.1 f r l v o 750 v in 750 r t figure 7. connection diagram for a vcl = +2 adel2020 2 + 3 4 6 e 0.1 f ev s 7 +v s 0.1 f r l v o 270 v in 30 r t figure 8. connection diagram for a vcl = +10
rev. a e8e 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 e3 db bandwidth is also somewhat dependent on the power supply voltage. lowering the supplies increases the values of internal capacitances, reducing the bandwidth. to compen- sate for this, smaller values of feedback resistors are used at lower supply voltages. power supply bypassing adequate power supply bypassing can be critical when optimiz- ing 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 con- nected 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 e0.1 db bandwidth are nearly inde- pendent of supply voltage and load. for applications requiring widest 0.1 db bandwidth, it is recommended to use 715 feed- back and gain resistors. this will result in about 0.05 db of peaking and a e0.1 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 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. leaving the disable pin disconnected (floating) will leave the part in the enabled state. 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 pep. 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 pull- up 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. 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.
rev. a adel2020 e9e outline dimensions 8-lead plastic dual-in-line package [pdip] (n-8) dimensions shown in inches and (millimeters) seating plane 0.015 (0.38) min 0.180 (4.57) max 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.060 (1.52) 0.050 (1.27) 0.045 (1.14) 8 1 4 5 0.295 (7.49) 0.285 (7.24) 0.275 (6.98) 0.100 (2.54) bsc 0.375 (9.53) 0.365 (9.27) 0.355 (9.02) 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 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 compliant to jedec standards mo-095aa 20-lead standared small outline pacakge [soic] wide body (r-20) dimensions shown in millimeters and (inches) 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 compliant to jedec standards ms-013ac 0.75 (0.0295) 0.25 (0.0098) 20 11 10 1 0.32 (0.0126) 0.23 (0.0091) 8 0 45 1.27 (0.0500) 0.40 (0.0157) seating plane 0.30 (0.0118) 0.10 (0.0039) 0.51 (0.0201) 0.33 (0.0130) 2.65 (0.1043) 2.35 (0.0925) 1.27 (0.0500) bsc 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 13.00 (0.5118) 12.60 (0.4961) coplanarity 0.10
rev. a e10e 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
e11e
c03445e0e1/03(a) printed in u.s.a. e12e

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