tm 3-1 hfa1100, HFA1120 850mhz, low distortion current feedback operational ampli?rs the hfa1100, 1120 are a family of high-speed, wideband, fast settling current feedback ampli?rs built with intersil's proprietary complementary bipolar uhf-1 process. both ampli?rs operate with single supply voltages as low as 4.5v (see application information section). the hfa1100 is a basic op amp with uncommitted pins 1, 5, and 8. the HFA1120 includes inverting input bias current adjust pins (pins 1 and 5) for adjusting the output offset voltage. these devices offer a signi?ant performance improvement over the ad811, ad9617/18, the clc400-409, and the el2070, el2073, el2030. for military grade product refer to the hfa1100/883, HFA1120/883 data sheet. the op amps with fastest edges features low distortion (30mhz, hd2). . . . . . . . . . . . . . . . . -56dbc -3db bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 850mhz very fast slew rate . . . . . . . . . . . . . . . . . . . . . . 2300v/ s fast settling time (0.1%) . . . . . . . . . . . . . . . . . . . . . 11ns excellent gain flatness - (100mhz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.14db - (50mhz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.04db high output current . . . . . . . . . . . . . . . . . . . . . . . . . 60ma overdrive recovery . . . . . . . . . . . . . . . . . . . . . . . . <10ns operates with 5v single supply (see an9745) applications video switching and routing pulse and video ampli?rs rf/if signal processing flash a/d driver medical imaging systems related literature - an9420, current feedback theory - an9202, hfa11xx evaluation fixture - an9745, single 5v supply operation pinouts hfa1100 (pdip, soic) top view HFA1120 (soic) top view ordering information part number (brand) temp. range ( o c) package pkg. no. hfa1100ip -40 to 85 8 ld pdip e8.3 hfa1100ib (h1100i) -40 to 85 8 ld soic m8.15 HFA1120ib (h1120i) -40 to 85 8 ld soic m8.15 hfa11xxeval dip ev aluation board for high-speed op amps input 220mhz signal output (a v = 2) hfa1130 op amp 0ns 25ns nc -in +in v- 1 2 3 4 8 7 6 5 nc v+ out nc - + bal -in +in v- 1 2 3 4 8 7 6 5 nc v+ out bal - + data sheet may 1999 file number 2945.7 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 321-724-7143 | intersil and design is a trademark of intersil corporation. | copyright intersil corporation 2000
3-2 absolute maximum ratings t a = 25 o c thermal information voltage between v+ and v- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12v input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v supply differential input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5v output current (50% duty cycle) . . . . . . . . . . . . . . . . . . . . . . 60ma operating conditions temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . -40 o c to 85 o c thermal resistance (typical, note 1) ja ( o c/w) jc ( o c/w) pdip package . . . . . . . . . . . . . . . . . . . 130 n/a soic package . . . . . . . . . . . . . . . . . . . 170 n/a maximum junction temperature (plastic package) . . . . . . . . .150 o c maximum storage temperature range . . . . . . . . . . -65 o c to 150 o c maximum lead temperature (soldering 10s) . . . . . . . . . . . . 300 o c (soic - lead tips only) caution: stresses above those listed in ?bsolute maximum ratings may cause permanent damage to the device. this is a stress only rating and operatio n of the device at these or any other conditions above those indicated in the operational sections of this speci?ation is not implied. note: 1. ja is measured with the component mounted on an evaluation pc board in free air. electrical speci?ations v supply = 5v, a v = +1, r f = 510 ? , r l = 100 ? , unless otherwise speci?d parameter test conditions (note 2) test level temp. ( o c) min typ max units input characteristics input offset voltage (note 3) a 25 - 2 6 mv a full - - 10 mv input offset voltage drift c full - 10 - v/ o c v io cmrr ? v cm = 2v a 25 40 46 - db a full 38 - - db v io psrr ? v s = 1.25v a 25 45 50 - db a full 42 - - db non-inverting input bias current (note 3) +in = 0v a 25 - 25 40 a a full - - 65 a +i bias drift c full - 40 - na/ o c +i bias cms ? v cm = 2v a 25 - 20 40 a/v a full - - 50 a/v inverting input bias current (note 3) -in = 0v a 25 - 12 50 a a full - - 60 a -i bias drift c full - 40 - na/ o c -i bias cms ? v cm = 2v a 25 - 1 7 a/v a full - - 10 a/v -i bias pss ? v s = 1.25v a 25 - 6 15 a/v a full - - 27 a/v -i bias adj. range (HFA1120) a 25 100 200 - a non-inverting input resistance a 25 25 50 - k ? inverting input resistance c 25 - 20 30 ? input capacitance (either input) b 25 - 2 - pf input common mode range c full 2.5 3.0 - v input noise voltage (note 3) 100khz b 25 - 4 - nv/ hz +input noise current (note 3) 100khz b 25 - 18 - pa/ hz -input noise current (note 3) 100khz b 25 - 21 - pa/ hz hfa1100, HFA1120
3-3 transfer characteristics a v = +2, unless otherwise speci?d open loop transimpedance (note 3) b 25 - 300 - k ? -3db bandwidth (note 3) v out = 0.2v p-p , a v = +1 b 25 530 850 - mhz -3db bandwidth v out = 0.2v p-p , a v = +2, r f = 360 ? b 25 - 670 - mhz full power bandwidth v out = 4v p-p , a v = -1 b 25 - 300 - mhz gain flatness (note 3) to 100mhz b 25 - 0.14 - db gain flatness to 50mhz b 25 - 0.04 - db gain flatness to 30mhz b 25 - 0.01 - db linear phase deviation (note 3) dc to 100mhz b 25 - 0.6 - degrees differential gain ntsc, r l = 75 ? b 25 - 0.03 - % differential phase ntsc, r l = 75 ? b 25 - 0.05 - degrees minimum stable gain a full 1 - - v/v output characteristics a v = +2, unless otherwise speci?d output voltage (note 3) a v = -1 a 25 3.0 3.3 - v a full 2.5 3.0 - v output current r l = 50 ? , a v = -1 a 25, 85 50 60 - ma a -40 35 50 - ma dc closed loop output impedance (note 3) b 25 - 0.07 - ? 2nd harmonic distortion (note 3) 30mhz, v out = 2v p-p b 25 - -56 - dbc 3rd harmonic distortion (note 3) 30mhz, v out = 2v p-p b 25 - -80 - dbc 3rd order intercept (note 3) 100mhz b 25 20 30 - dbm 1db compression 100mhz b 25 15 20 - dbm transient response a v = +2, unless otherwise speci?d rise time v out = 2.0v step b 25 - 900 - ps overshoot (note 3) v out = 2.0v step b 25 - 10 - % slew rate a v = +1, v out =5v p-p b 25 - 1400 - v/ s slew rate a v = +2, v out =5v p-p b 25 1850 2300 - v/ s 0.1% settling (note 3) v out = 2v to 0v b 25 - 11 - ns 0.2% settling (note 3) v out = 2v to 0v b 25 - 7 - ns overdrive recovery time 2x overdrive b 25 - 7.5 10 ns power supply characteristics supply voltage range b full 4.5 - 5.5 v supply current (note 3) a 25 - 21 26 ma a full - - 33 ma notes: 2. test level: a. production tested; b. typical or guaranteed limit based on characterization; c. design typical for information only. 3. see typical performance curves for more information. electrical speci?ations v supply = 5v, a v = +1, r f = 510 ? , r l = 100 ? , unless otherwise speci?d (continued) parameter test conditions (note 2) test level temp. ( o c) min typ max units hfa1100, HFA1120
3-4 application information optimum feedback resistor (r f ) the enclosed plots of inverting and non-inverting frequency response detail the performance of the hfa1100/1120 in various gains. although the bandwidth dependency on a cl isn? as severe as that of a voltage feedback amplifier, there is an appreciable decrease in bandwidth at higher gains. this decrease can be minimized by taking advantage of the current feedback amplifier s unique relationship between bandwidth and r f . all current feedback amplifiers require a feedback resistor, even for unity gain applications, and the r f , in conjunction with the internal compensation capacitor, sets the dominant pole of the frequency response. thus, the amplifier s bandwidth is inversely proportional to r f . the hfa1100, 1120 designs are optimized for a 510 ? r f , at a gain of +1. decreasing r f in a unity gain application decreases stability, resulting in excessive peaking and overshoot (note: capacitive feedback causes the same problems due to the feedback impedance decrease at higher frequencies). at higher gains the amplifier is more stable, so r f can be decreased in a trade-off of stability for bandwidth. the table below lists recommended r f values for various gains, and the expected bandwidth. offset adjustment the HFA1120 allows for adjustment of the inverting input bias current to null the output offset voltage. -i bias ?ws through r f , so any change in bias current forces a corresponding change in output voltage. the amount of adjustment is a function of r f . with r f = 510 ? , the typical adjust range is 100mv. for offset adjustment connect a 10k ? potentiometer between pins 1 and 5 with the wiper connected to v-. 5v single supply operation these ampli?rs will operate at single supply voltages down to 4.5v. the table below details the ampli?r s performance with a single 5v supply. the dramatic supply current reduction at this operating condition (refer also to figure 23) makes these op amps even better choices for low power 5v systems. refer to application note an9745 for further information. use of die in hybrid applications these ampli?rs are designed with compensation to negate the package parasitics that typically lead to instabilities. as a result, the use of die in hybrid applications results in overcompensated performance due to lower parasitic capacitances. reducing r f below the recommended values for packaged units will solve the problem. for a v = +2 the recommended starting point is 300 ? , while unity gain applications should try 400 ? . pc board layout the frequency performance of these ampli?rs depends a great deal on the amount of care taken in designing the pc board. the use of low inductance components such as chip resistors and chip capacitors is strongly recommended, while a solid ground plane is a must! attention should be given to decoupling the power supplies. a large value (10 f) tantalum in parallel with a small value chip (0.1 f) capacitor works well in most cases. terminated microstrip signal lines are recommended at the input and output of the device. output capacitance, such as that resulting from an improperly terminated transmission line will degrade the frequency response of the ampli?r and may cause oscillations. in most cases, the oscillation can be avoided by placing a resistor in series with the output. care must also be taken to minimize the capacitance to ground seen by the amplifier s inverting input. the larger this capacitance, the worse the gain peaking, resulting in pulse overshoot and possible instability. to this end, it is recommended that the ground plane be removed under traces connected to pin 2, and connections to pin 2 should be kept as short as possible. an example of a good high frequency layout is the evaluation board shown below. evaluation board an evaluation board is available for the hfa1100 (part number hfa11xxeval). please contact your local sales of?e for information. a cl r f ( ? ) bw (mhz) +1 510 850 -1 430 580 +2 360 670 +5 150 520 +10 180 240 +19 270 125 parameter typ input common mode range 1v to 4v -3db bw (a v = +2) 267mhz gain flatness (to 50mhz, a v = +2) 0.05db output voltage (a v = -1) 1.3v to 3.8v slew rate (a v = +2) 475v/ s 0.1% settling time 17ns supply current 5.5ma hfa1100, HFA1120
3-5 the layout and schematic of the board are shown below: top layout bottom layout 1 2 3 4 8 7 6 5 +5v 10 f 0.1 f v h 50 ? gnd gnd 500 ? 500 ? -5v 0.1 f 10 f 50 ? in out v l v h +in v l v+ gnd 1 v- out typical performance curves v supply = 5v, r f = 510 ? , t a = 25 o c, r l = 100 ?, unless otherwise specified figure 1. small signal pulse figure 2. large signal pulse figure 3. non-inverting frequency response figure 4. inverting frequency response 120 time (5ns/div.) 90 60 30 0 -30 -60 -90 -120 output voltage (mv) a v = +2 output voltage (v) 1.2 0.9 0.6 0.3 0 -0.3 -0.6 -0.9 -1.2 a v = +2 time (5ns/div.) frequency (mhz) 0 -3 -6 -9 -12 normalized gain (db) 0.3 1 10 100 1k 0 -90 -180 -270 -360 phase gain a v = +1 a v = +1 a v = +11 a v = +2 a v = +6 a v = +11 a v = +2 a v = +6 phase (degrees) v out = 200mv p-p frequency (mhz) phase gain 0 -3 -6 -9 -12 normalized gain (db) 0.3 1 10 100 1k 180 90 0 -90 -180 a v = -1 a v = -1 a v = -20 a v = -5 a v = -10 a v = -20 a v = -5 a v = -10 phase (degrees) v out = 200mv p-p hfa1100, HFA1120
3-6 figure 5. frequency response for various load resistors figure 6. frequency response for various load resistors figure 7. frequency response for various output voltages figure 8. frequency response for various output voltages figure 9. frequency response for various output voltages figure 10. -3db bandwidth vs temperature typical performance curves v supply = 5v, r f = 510 ? , t a = 25 o c, r l = 100 ?, unless otherwise specified (continued) frequency (mhz) 6 3 0 -3 -6 gain (db) 0.3 1 10 100 1k 0 -90 -180 -270 -360 phase gain r l = 1k ? r l = 100 ? r l = 50 ? r l = 1k ? r l = 100 ? r l = 1k ? phase (degrees) r l = 50 ? r l = 100 ? a v = +1, v out = 200mv p-p frequency (mhz) phase gain 3 0 -3 -6 normalized gain (db) 0.3 1 10 100 1k 0 -90 -180 -270 -360 phase (degrees) r l = 100 ? r l = 1k ? r l = 50 ? r l = 100 ? r l = 1k ? r l = 50 ? r l = 100 ? r l = 1k ? a v = +2, v out = 200mv p-p frequency (mhz) 20 10 0 -10 -20 gain (db) 0.3 1 10 100 1k -30 0.160v p-p 0.500v p-p 0.920v p-p 1.63v p-p a v = +1 frequency (mhz) 20 10 0 -10 -20 normalized gain (db) 0.3 1 10 100 1k -30 0.32v p-p 1.00v p-p 1.84v p-p 3.26v p-p a v = +2 frequency (mhz) 20 10 0 -10 -20 normalized gain (db) 0.3 1 10 100 1k -30 3.89v p-p 0.96v p-p to a v = +6 temperature ( o c) 950 900 850 800 750 bandwidth (mhz) -50 -25 0 75 125 700 25 50 100 a v = +1 hfa1100, HFA1120
3-7 figure 11. open loop transimpedance figure 12. gain flatness figure 13. deviation from linear phase figure 14. settling response figure 15. closed loop output resistance figure 16. 3rd order intermodulation intercept typical performance curves v supply = 5v, r f = 510 ? , t a = 25 o c, r l = 100 ?, unless otherwise specified (continued) 250 25 2.5 0.25 0.01 0.1 1 10 100 500 180 135 90 45 0 phase (degrees) gain (k ? ) frequency (mhz) a v = -1 gain phase frequency (mhz) 0 -0.05 -0.10 gain (db) 1 10 100 -0.15 -0.20 a v = +2 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 0 15 30 45 60 75 90 105 120 135 150 frequency (mhz) deviation (degrees) a v = +2 time (ns) 0.6 0.4 0.2 0 settling error (%) -4 1 6 21 31 -0.2 11 16 26 36 41 46 -0.4 -0.6 a v = +2, v out = 2v output resistance ( ? ) 1000 100 10 1 0.1 0.3 1 10 100 1000 frequency (mhz) frequency (mhz) 40 35 30 25 20 intercept point (dbm) 0 100 200 15 300 400 10 5 0 2-tone hfa1100, HFA1120
3-8 figure 17. 2nd harmonic distortion vs p out figure 18. 3rd harmonic distortion vs p out figure 19. overshoot vs input rise time figure 20. overshoot vs input rise time figure 21. overshoot vs feedback resistor figure 22. supply current vs temperature typical performance curves v supply = 5v, r f = 510 ? , t a = 25 o c, r l = 100 ?, unless otherwise specified (continued) output power (dbm) -30 -35 -40 -45 -50 distortion (dbc) -5 3 -55 -60 -65 -70 -3 -1 1 5 7 9 11 13 15 100mhz 50mhz 30mhz output power (dbm) -30 -40 -50 -60 -70 distortion (dbc) -5 3 -80 -90 -100 -110 -3 -1 1 5 7 9 11 13 15 100mhz 50mhz 30mhz input rise time (ps) 38 36 34 32 30 overshoot (%) 100 500 28 26 24 22 200 300 400 600 700 800 900 1000 v out = 1v p-p v out = 2v p-p v out = 0.5v p-p 20 18 16 14 12 10 8 6 a v = +1 input rise time (ps) 35 30 25 20 15 overshoot (%) 100 500 10 5 0 200 300 400 600 700 800 900 1000 r f = 360 ? v out = 2v p-p r f = 360 ? v out = 1v p-p r f = 360 ? v out = 0.5v p-p r f = 510 ? v out = 0.5v p-p r f = 510 ? v out = 1v p-p r f = 510 ? v out = 2v p-p a v = +2 feedback resistor ( ? ) 36 34 32 30 overshoot (%) 360 520 28 26 24 22 400 440 480 560 600 640 680 20 18 16 14 12 10 8 6 4 a v = +2, t r = 200ps, v out = 2v p-p temperature ( o c) 25 24 23 22 21 supply current (ma) -60 20 20 19 18 -40 -20 0 40 60 80 100 120 hfa1100, HFA1120
3-9 figure 23. supply current vs supply voltage figure 24. v io and bias currents vs temperature figure 25. output voltage vs temperature figure 26. input noise vs frequency typical performance curves v supply = 5v, r f = 510 ? , t a = 25 o c, r l = 100 ?, unless otherwise specified (continued) total supply voltage (v+ - v-, v) 22 17 15 13 11 supply current (ma) 59 9 7 5 678 10 21 20 19 6 8 10 12 14 16 18 temperature ( o c) 45 42 39 36 33 bias currents ( a) -60 20 30 27 24 -40 -20 0 40 60 80 100 120 21 18 15 12 9 6 3 0 2.8 2.7 2.6 2.5 2.4 input offset voltage (mv) 2.3 2.2 2.1 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 +i bias v io -i bias temperature ( o c) 3.7 3.6 3.5 3.4 output voltage (v) -60 20 3.3 3.2 3.1 3 -40 -20 0 40 60 80 100 2.9 2.8 2.7 2.6 2.5 120 | - v out | +v out a v = -1, r l = 50 ? 300 275 250 225 200 175 150 125 100 75 50 25 0 30 25 20 15 10 5 0 100 1k 10k 100k frequency (hz) voltage noise (nv/ hz) current noise (pa/ hz) eni ini- ini+ e ni i ni - i ni + hfa1100, HFA1120
10 all intersil semiconductor products are manufactured, assembled and tested under iso9000 quality systems certi?ation. intersil semiconductor products are sold by description only. intersil corporation reserves the right to make changes in circuit design and/or spec ifications at any time with- out notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is b elieved to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of th ird parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see web site http://www.intersil.com die characteristics die dimensions: 63 mils x 44 mils x 19 mils 1600 m x 1130 m metallization: type: metal 1: alcu (2%)/tiw thickness: metal 1: 8k ? 0.4k ? type: metal 2: alcu (2%) thickness: metal 2: 16k ? 0.8k ? passivation: type: nitride thickness: 4k ? 0.5k ? transistor count: 52 substrate potential (powered up): floating (recommend connection to v-) metallization mask layout hfa1100, HFA1120 +in v- v l bal out -in bal v h v+ hfa1100, HFA1120
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