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max4278 v in 75 ? 75 ? v out 75 ? video/rf cable driver dip/so/ max top view out in n.c. v ee 1 2 8 7 n.c. v cc gnd n.c. MAX4178 max4278 3 4 6 5 v ee gnd in 15 v cc out sot23-5 2 34 MAX4178 max4278 19-0468; rev 2; 11/99 general description the MAX4178/max4278 are ?v, wide-bandwidth, fast- settling, closed-loop buffers featuring high slew rate, high precision, high output current, low noise, and low differen- tial gain and phase errors. the MAX4178, with a -3db bandwidth of 330mhz, is preset for unity voltage gain (0db). the max4278 is preset for a voltage gain of +2 (6db) and has a 310mhz -3db bandwidth. the MAX4178/max4278 feature the high slew rate and low power that are characteristic of current-mode feed- back amplifiers. however, unlike conventional current- mode feedback amplifiers, these devices have a unique input stage that combines the benefits of cur- rent-feedback topology with those of the traditional volt- age-feedback topology. this combination results in low input offset voltage and bias current, low noise, and high gain precision and power-supply rejection. the MAX4178/max4278 are ideally suited for driving 50 ? or 75 ? loads. they are the perfect choice for high- speed cable-driving applications, such as video routing. the MAX4178/max4278 are available in dip, so, space-saving ?ax, and sot23 packages. ________________________applications broadcast and high-definition tv systems video switching and routing high-speed cable drivers communications medical imaging precision high-speed dac/adc buffers ____________________________features high speed 330mhz -3db bandwidth (MAX4178) 310mhz -3db bandwidth (max4278) 250mhz full-power bandwidth (v out = 2vp-p) 150mhz 0.1db flatness bandwidth 1300v/s slew rate (MAX4178) 1600v/s slew rate (max4278) low differential phase/gain error: 0.01?0.04% 8ma supply current 1a input bias current 0.5mv input offset voltage 5nv/ h h z z input-referred voltage noise 2pa/ h h z z input-referred current noise 1.0% max gain error with 100 ? load short-circuit protected 8000v esd protection available in space-saving sot23 package MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers ________________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part MAX4178 epa MAX4178esa MAX4178eua -40? to +85? -40? to +85? -40? to +85? temp. range pin- package 8 plastic dip 8 so 8 ?ax evaluation kit available ordering information ordering information continued at end of data sheet. pin configurations typical operating circuit MAX4178mja -55? to +125? 8 cerdip MAX4178euk-t -40? to +85? 5 sot23-5 sot top mark abyx
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers 2 ______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +5v, v ee = -5v, v out = 0, r l = , t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v cc to v ee ) ..................................................12v input voltage....................................(v cc + 0.3v) to (v ee - 0.3v) output short-circuit duration (to gnd) .....................continuous continuous power dissipation (t a = +70?) sot23 (derate 7.10mw/? above +70?) ..................571mw plastic dip (derate 9.09mw/? above +70?) ...........727mw so (derate 5.88mw/? above +70?) ........................471mw ?ax (derate 4.10mw/? above +70?) ...................330mw cerdip (derate 8.00mw/? above +70?) ................640mw operating temperature ranges (note 1) MAX4178e_a/max4278e_a ...........................-40? to +85? MAX4178euk/max4278euk .........................-40? to +85? MAX4178mja/max4278mja .......................-55? to +125? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? conditions units min typ max symbol parameter MAX4178 ?.5 ?.0 max4278 v ?.25 ?.5 v in input voltage range 0.5 2.0 ?/? 2 tcv os input offset voltage drift 13 ? i b input bias current m ? 1 r in input resistance v s = ?.5v to ?.5v db 70 90 psrr power-supply rejection ratio +0.990 +1.000 MAX4178 (note 2) +0.985 +1.000 +1.98 +2.01 max4278 (note 3) v/v +1.97 +2.01 a v voltage gain v out = ?mv to ?v % 0.01 a v(lin) gain linearity f = dc ? 0.1 r out output resistance short to gnd ma 150 i sc short-circuit output current r l = 100 ? ?.5 ?.0 t a = +25? r l = 100 ? r l = 50 ? r l = 100 ? r l = 50 ? r l = 50 ? v ?.0 ?.5 v out output voltage swing t a = +25? 810 12 ma 14 t a = t min to t max i sy quiescent supply current max4_78e_ _ max4_78mja t a = -40? to +85? ma 70 100 i out minimum output current 3.0 t a = t min to t max 5 note 2: voltage gain = (v out - v os ) / v in measured at v in = ?.5v. note 3: voltage gain = (v out - v os ) / v in measured at v in = ?.25v. t a = +25? 0.5 3.0 t a = t min to t max 5.0 mv v os input offset voltage max4_78esa/epa/eua/mja max4_78euk max4_78esa/epa/eua/mja max4_78euk note 1: specifications for the max4_78euk (sot23 packages) are 100% tested at t a = +25?, and guaranteed by design over temperature.
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers ________________________________________________________________________________________ 3 ac electrical characteristics (v cc = +5v, v ee = -5v, r l = 100 ? , t a = +25?, unless otherwise noted.) note 4: tested with a 3.58mhz video test signal with an amplitude of 40ire superimposed on a linear ramp (0 to 100ire). an ire is a unit of video signal amplitude developed by the institute of radio engineers; 140ire = 1v in color systems. conditions v out = 2v step ns 2 t r , t f rise/fall times f = 10mhz nv/ hz 5 e n input voltage noise density f = 10mhz pa/ hz 2 i n input current noise density 0.04 f = 3.58mhz % 0.04 dg differential gain (note 4) f = 5mhz, v out = 2vp-p db c -81 sfdr spurious-free dynamic range 36 f c = 10mhz, v out = 2vp-p dbm 31 ip3 third-order intercept units min typ max parameter max4278 330 v out 0.1vp-p mhz 310 bw small-signal, -3db bandwidth MAX4178 to 0.01% 10 v out = 2v step ns 12 t s settling time to 0.1% MAX4178 max4278 0.01 max4278 MAX4178 f = 3.58mhz degrees 0.01 dp differential phase (note 4) -58 max4278 MAX4178 f c = 10mhz, v out = 2vp-p db -59 thd total harmonic distortion MAX4178 max4278 pf 1 c in input capacitance MAX4178 max4278 -74 symbol 150 MAX4178 150 max4278 mhz v out 0.1vp-p bw (0.1db) small-signal, ?.1db bandwidth 1600 1300 MAX4178 max4278 250 v out = 2vp-p v/? mhz 250 fpbw v out = ?vp-p max4278 full-power bandwidth MAX4178 sr slew rate
__________________________________________typical operating characteristics (v cc = +5v, v ee = -5v, r l = 100 ? , c l = 0pf, t a = +25?, unless otherwise noted.) MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers 4 ______________________________________________________________________________________ 2 -8 1m 10m 100m 1g MAX4178 small-signal gain vs. frequency -5 -6 -7 0 -1 -2 -3 -4 1 MAX4178/4278-01 frequency (hz) gain (db) -0.7 1m 10m 100m 1g MAX4178 gain flatness vs. frequency -0.4 -0.5 -0.6 -0.8 0.1 0 -0.1 -0.2 -0.3 0.2 MAX4178/4278-02 frequency (hz) gain (db) -6 1m 10m 100m 1g MAX4178 large-signal gain vs. frequency -3 -4 -5 -7 2 1 0 -1 -2 3 MAX4178/4278-03 frequency (hz) gain (db) v o = 2vp-p -1 1m 10m 100m 1g max4278 small-signal gain vs. frequency 2 1 0 -2 7 6 5 4 3 8 MAX4178/4278-04 frequency (hz) gain (db) 5.3 1m 10m 100m 1g max4278 gain flatness vs. frequency 5.6 5.5 5.4 5.2 6.1 6.0 5.9 5.8 5.7 6.2 MAX4178/4278-05 frequency (hz) gain (db) -6 1m 10m 100m 1g max4278 large-signal gain vs. frequency 0 -2 -4 -8 10 8 6 4 2 12 MAX4178/4278-06 frequency (hz) gain (db) v o = 2vp-p MAX4178 large-signal pulse response (c l = 0pf) MAX4178/4278-08 time (10ns/div) voltage (2v/div) in out gnd gnd max4278 small-signal pulse response (c l = 0pf) MAX4178/4278-09 time (10ns/div) voltage in (50mv/ div) out (100mv/ div) gnd gnd MAX4178 small-signal pulse response (c l = 0pf) MAX4178/4278-07 time (10ns/div) voltage (100mv/div) in out gnd gnd
typical operating characteristics (continued) (v cc = +5v, v ee = -5v, r l = 100 ? , c l = 0pf, t a = +25?, unless otherwise noted.) MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers _______________________________________________________________________________________ 5 max4278 large-signal pulse response (c l = 0pf) MAX4178/4278-10 time (10ns/div) voltage in (1v/div) out (2v/div) gnd gnd MAX4178 small-signal pulse response (c l = 50pf) MAX4178/4278-11 time (20ns/div) voltage (100mv/div) in out gnd gnd MAX4178 large-signal pulse response (c l = 50pf) MAX4178/4278-12 time (20ns/div) voltage (2v/div) in out gnd gnd MAX4178 small-signal pulse response (c l = 100pf) MAX4178/4278-13 time (20ns/div) voltage (100mv/div) in out gnd gnd MAX4178 large-signal pulse response (c l = 100pf) MAX4178/4278-14 time (20ns/div) voltage (2v/div) in out gnd gnd max4278 small-signal pulse response (c l = 50pf) MAX4178/4278-15 time (20ns/div) voltage in (50mv/ div) out (100mv/ div) gnd gnd max4278 large-signal pulse response (c l = 50pf) MAX4178/4278-16 time (20ns/div) voltage in (1v/div) out (2v/div) gnd gnd max4278 small-signal pulse response (c l = 100pf) MAX4178/4278-17 time (20ns/div) voltage in (50mv/ div) out (100mv/ div) gnd gnd max4278 large-signal pulse response (c l = 100pf) MAX4178/4278-18 time (20ns/div) voltage in (1v/div) out (2v/div) gnd gnd
typical operating characteristics (continued) (v cc = +5v, v ee = -5v, r l = 100 ? , c l = 0pf, t a = +25?, unless otherwise noted.) MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers 6 ______________________________________________________________________________________ 0.00 -0.02 0.02 -0.010 0 100 100 MAX4178 differential phase/gain -0.006 -0.008 -0.04 -0.06 ire ire diff phase (deg) diff gain (%) 0.002 0.000 -0.004 -0.002 MAX4178/4278-19 0 r l = 150 ? r l = 150 ? 0.00 0.01 -0.02 -0.03 -0.01 0.02 -0.006 0 100 100 max4278 differential phase/gain -0.004 -0.04 -0.05 -0.06 ire ire diff phase (deg) diff gain (%) 0.002 -0.002 0.000 MAX4178/4278-20 0 r l = 150 ? r l = 150 ? -20 -100 1k 10k 1m 10m 100k 100m MAX4178 harmonic distortion vs. frequency -80 MAX4178/4278-21 frequency (hz) distortion (db) -60 -40 total harmonic distortion second harmonic third harmonic -40 -100 10k 1m 10m 100k 100m max4278 harmonic distortion vs. frequency -90 MAX4178/4278-22 frequency (hz) distortion ( d b) -80 -70 -60 -50 second harmonic total harmonic distortion third harmonic -50 input offset voltage (v os ) vs. temperature MAX4178/4278-25 temperature (?c) input offset voltage (?) -200 -300 -100 0 100 200 300 400 -25 0 25 50 75 125 100 v in = 0v -30 -20 -110 -50 -70 -90 30k 100k 1m 10m 100m power-supply rejection vs. frequency -100 MAX4178/4278-23 frequency (hz) power-supply rejection ( db ) -80 -60 -40 max4278 MAX4178 1k 0.1 100k 1m 10m 100m 500m output impedance vs. frequency 1 MAX4178/4278-24 frequency (hz) output impedance ( ? ) 10 100 max4278 MAX4178 -50 quiescent supply current (i sy ) vs. temperature MAX4178/4278-26 temperature ( ? c) quiescent supply current (ma) 2 0 4 6 8 10 12 14 -25 0 25 50 75 125 100 -50 input bias current (i b ) vs. temperature MAX4178/4278-27 temperature ( ? c) input bias current (a) 0.5 0 1.0 1.5 2.0 2.5 3.0 3.5 -25 0 25 50 75 125 100 v in = 0v
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers ________________________________________________________________________________________ 7 detailed description the MAX4178/max4278 are ?v, wide-bandwidth, fast-settling, closed-loop buffers featuring high slew rate, high precision, high output current, low noise, and low differential gain and phase errors. the MAX4178, with a -3db bandwidth of 330mhz, is preset for unity volt- age gain (0db). the max4278 is preset for a voltage gain of +2 (6db) and has a 310mhz -3db bandwidth. these devices have a unique input stage that com- bines the benefits of a current-mode-feedback topolo- gy (high slew rate and low power) with those of a traditional voltage-feedback topology. this combination of architectures results in low input offset voltage and bias current, and high gain precision and power-supply rejection. under short-circuit conditions, the output current is typ- ically limited to 150ma. this is low enough that a short to ground of any duration will not cause permanent damage to the chip. however, a short to either supply will create double the allowable power dissipation and may cause permanent damage if allowed to exist for longer than approximately 10 seconds. the high out- put-current capability is an advantage in systems that transmit a signal to several loads. see the high- performance video distribution amplifier section. -50 output voltage swing vs. temperature MAX4178/4278-28 temperature ( ? c) output voltage swing (v) 3.0 2.5 3.5 4.0 -25 0 25 50 75 125 100 r l = r l = 100 ? r l = 50 ? 8 -50 input voltage range vs. temperature MAX4178/4278-29 temperature ( ? c) input voltage range (v) 2.0 3.5 3.0 2.5 1.5 1.0 4.0 4.5 MAX4178 max4278 -25 0 25 50 75 125 100 typical operating characteristics (continued) (v cc = +5v, v ee = -5v, r l = 100 ? , c l = 0pf, t a = +25?, unless otherwise noted.) pin description 1 5 2 3 4 output 6 positive power supply. connect to +5v. 7 negative power supply. connect to -5v. 4 input 3 ground 2 no connection 1, 5, 8 pin out v cc v ee in gnd n.c. name sot23 so/max/dip function
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers 8 ______________________________________________________________________________________ applications information grounding, bypassing, and pc board layout in order to obtain the MAX4178/max4278s?full 330mhz/ 310mhz bandwidths, microstrip and stripline tech- niques are recommended in most cases. to ensure that the pc board does not degrade the amplifier? per- formance, it? a good idea to design the board for a fre- quency greater than 1ghz. even with very short traces, it? good practice to use these techniques at critical points, such as inputs and outputs. whether you use a constant-impedance board or not, observe the follow- ing guidelines when designing the board: ? do not use wire-wrap boards. they are too inductive. ? do not use ic sockets. they increase parasitic capaci- tance and inductance. ? in general, surface-mount components have shorter leads and lower parasitic reactance, giving better high-frequency performance than through-hole com- ponents. ? the pc board should have at least two layers, with one side a signal layer and the other a ground plane. ? keep signal lines as short and straight as possible. do not make 90 turns; round all corners. ? the ground plane should be as free from voids as possible. on maxim? evaluation kit, the ground plane has been removed from areas where keeping the trace capaci- tance to a minimum is more important than maintaining ground continuity. driving capacitive loads the MAX4178/max4278 provide maximum ac perfor- mance with no output load capacitance. this is the case when the MAX4178/max4278 are driving a cor- rectly terminated transmission line (e.g., a back-termi- nated 75 ? cable). however, the MAX4178/max4278 are capable of driving capacitive loads up to 100pf without oscillations, but with reduced ac performance. driving large capacitive loads increases the chance of oscillations in most amplifier circuits. this is especially true for circuits with high loop gains, such as voltage followers. the amplifier? output resistance and the load capacitor combine to add a pole and excess phase to the loop response. if the frequency of this pole is low enough and if phase margin is degraded sufficiently, oscillations may occur. a second problem when driving capacitive loads results from the amplifier? output impedance, which looks inductive at high frequency. this inductance forms an l-c resonant circuit with the capacitive load, which causes peaking in the frequency response and degrades the amplifier? gain margin. the MAX4178/max4278 drive capacitive loads up to 100pf without oscillation. however, some peaking (in the frequency domain) or ringing (in the time domain) may occur. this is shown in figures 2a and 2b and the in the small- and large-signal pulse response graphs in the typical operating characteristics . to drive larger-capacitance loads or to reduce ringing, add an isolation resistor between the amplifier? output and the load, as shown in figure 1. the value of r iso depends on the circuit? gain and the capacitive load. figures 3a and 3b show the bode plots that result when a 20 ? isolation resistor is used with a voltage follower driving a range of capacitive loads. at the higher capacitor values, the bandwidth is dominated by the rc network, formed by r iso and c l ; the bandwidth of the amplifier itself is much higher. note that adding an isolation resistor degrades gain accuracy. the load and isolation resistor form a divider that decreases the voltage delivered to the load. MAX4178 max4278 v in r iso v out c l r l figure 1. capacitive-load driving circuit
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers ________________________________________________________________________________________ 9 8 7 6 -2 1m 100m 1g and isolation resistor 1 0 -1 5 4 3 2 MAX4178/4278-3b frequency (hz) gain (db) 10m r iso = 20 ? c l = 100pf c l = 47pf c l = 22pf c l = 0pf figure 3b. max4278 small-signal gain vs. frequency with capacitive load and isolation resistor (r iso ) 20 15 10 -30 1m 100m 1g frequency with capacitive load -15 -20 -25 5 0 -5 -10 MAX4178/4278-2a frequency (hz) gain (db) 10m r iso = 0 ? c l = 100pf c l = 47pf c l = 22pf c l = 0pf figure 2a. MAX4178 small-signal gain vs. frequency with capacitive load 26 21 16 -24 1m 100m 1g max4278 small signal gain vs. frequency with capacitive load -9 -14 -19 11 6 1 -4 MAX4178/4278-2b frequency (hz) gain (db) 10m r iso = 0 ? c l = 100pf c l = 47pf c l = 22pf c l = 0pf figure 2b. max4278 small-signal gain vs. frequency with capacitive load 2 1 0 -8 1m 100m 1g and isolation resistor -5 -6 -7 -1 -2 -3 -4 MAX4178/4278-3a frequency (hz) gain (db) 10m r iso = 20 ? c l = 100pf c l = 47pf c l = 22pf c l = 0pf figure 3a. MAX4178 small-signal gain vs. frequency with capacitive load and isolation resistor (r iso )
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers 10 _____________________________________________________________________________________ flash adc preamp the MAX4178/max4278s?high current-drive capability makes them well suited for buffering the low-imped- ance input of a high-speed flash adc. with their low output impedance, these buffers can drive the inputs of the adc with no loss of accuracy. figure 4 shows a preamp for digitizing video, using the 250msps max100 and the 500msps max101 flash adcs. both of these adcs have a 50 ? input resistance and a 1.2ghz input bandwidth. high-performance video distribution amplifier the max4278 (a v = +2) makes an excellent driver for multiple back-terminated 75 ? video coaxial cables (figure 5). the high current-output capability allows the attachment of up to six ?vp-p, 150 ? loads to the max4278 at +25?. with the output limited to ?vp-p, the number of loads may double. for multiple gain-of-2 video line drivers in a single package, refer to the max496/max497data sheet. MAX4178 max4278 video in flash adc (max100/max101) figure 4. preamp for video digitizer max4278 video in 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? out1 out2 outn figure 5. high-performance video distribution amplifier ___________________chip information transistor count: 175 substrate connected to v ee ordering information (continued) part max4278 epa max4278esa max4278eua -40? to +85? -40? to +85? -40? to +85? temp. range pin- package 8 plastic dip 8 so 8 ?ax max4278mja -55? to +125? 8 cerdip max4278euk-t -40? to +85? 5 sot23-5 sot top mark abyy
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers _______________________________________________________________________________________ 11 pdipn.eps soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0 -8 l 1 variations: package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
MAX4178/max4278 330mhz, gain of +1/gain of +2 closed-loop buffers ___________________________________________package information (continued) 8lumaxd.eps package outline, 8l umax/usop 1 1 21-0036 j rev. document control no. approval proprietary information title: max 0.043 0.006 0.014 0.120 0.120 0.198 0.026 0.007 0.037 0.0207 bsc 0.0256 bsc a2 a1 c e b a l front view side view e h 0.60.1 0.60.1 ? 0.500.1 1 top view d 8 a2 0.030 bottom view 1 6 s b l h e d e c 0 0.010 0.116 0.116 0.188 0.016 0.005 8 4x s inches - a1 a min 0.002 0.95 0.75 0.5250 bsc 0.25 0.36 2.95 3.05 2.95 3.05 4.78 0.41 0.65 bsc 5.03 0.66 6 0 0.13 0.18 max min millimeters - 1.10 0.05 0.15 dim sot5l.eps maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 1999 maxim integrated products printed usa is a registered trademark of maxim integrated products. (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)

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