1 ? fn7426 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 321-724-7143 | intersil (and design) is a registered trademark of intersil americas inc. copyright ? intersil americas inc. 2004. all rights reserved. elantec is a registered trademark of elantec semiconductor, inc. all other trademarks mentioned are the property of their respective owners. preliminary el5027 dual 2.5mhz rail-to-rail input-output buffer the el5027 is a dual, low power, high voltage rail-to-rail input-output buffer. operating on supplies ranging from 5v to 15v, while consuming only 110a per channel, the el5027 has a bandwidth of 2.5mhz - (-3db). the el5027 also provides rail-to-rail input and output ability, giving the maximum dynamic range at any supply voltage. the el5027 also features fast slewing and settling times, as well as a high output drive capability of 30ma (sink and source). these features make the el5027 ideal for use as voltage reference buffers in thin film transistor liquid crystal displays (tft-lcd). other applications include battery power, portable devices, and anywhere low power consumption is important. the el5027 is available in space-saving 6-pin tsot package and operates over a temperature range of -40c to +85c. features ? 2.5mhz -3db bandwidth ? unity gain buffer ? supply voltage = 4.5v to 16.5v ? low supply current (per buffer) = 110a ? high slew rate = 1.2v/s ? rail-to-rail operation ? pb-free available applications ? tft-lcd drive circuits ? electronics notebooks ? electronics games ? personal communication devices ? personal digital assistants (pda) ? portable instrumentation ? wireless lans ? office automation ? active filters ? adc/dac buffer pinout el5027 (6-pin tsot) top view ordering information part number package tape & reel pkg. dwg. # EL5027IWTZ (see note) 6-pin tsot (pb-free) - mdp0049 EL5027IWTZ-t7 (see note) 6-pin tsot (pb-free) 7? mdp0049 EL5027IWTZ-t7a (see note) 6-pin tsot (pb-free) 7? mdp0049 note: intersil pb-free products em ploy special pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both snpb and pb-free soldering operations. intersil pb-free products are msl classified at pb-free peak reflow te mperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020b. 1 2 3 6 4 5 vina vs- vinb vouta vs+ voutb data sheet june 24, 2004
2 absolute maxi mum ratings (t a = 25c) supply voltage between v s + and v s - . . . . . . . . . . . . . . . . . . . .+18v input voltage . . . . . . . . . . . . . . . . . . . . . . . . . v s - - 0.5v, v s + +0.5v maximum continuous output current . . . . . . . . . . . . . . . . . . . 30ma maximum die temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +125c storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c ambient operating temperature . . . . . . . . . . . . . . . .-40c to +85c power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see curves caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. important note: all parameters having min/max specifications are guaranteed. typical values are for information purposes only. u nless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a electrical specifications v s + = +5v, v s - = -5v, r l = 10k ? and c l = 10pf to 0v, t a = 25c unless otherwise specified. parameter description condition min typ max unit input characteristics v os input offset voltage v cm = 0v 1 15 mv tcv os average offset voltage drift (note 1) 5 v/c i b input bias current v cm = 0v 2 50 na r in input impedance 1g ? c in input capacitance 1.35 pf a v voltage gain -4.5v v out 4.5v 0.995 1.005 v/v output characteristics v ol output swing low i l = -5ma -4.92 -4.85 v v oh output swing high i l = 5ma 4.85 4.92 v i sc short circuit current short to gnd 120 ma power supply performance psrr power supply rejection ratio v s is moved from 2.25v to 7.75v 55 80 db i s supply current (per buffer) no load 110 160 a dynamic performance sr slew rate (note 2) -4.0v v out 4.0v, 20% to 80% 0.7 1.2 v/s t s settling to +0.1% v o = 2v step 900 ns bw -3db bandwidth r l = 10k ? , c l = 10pf 2.5 mhz cs channel separation f = 5mhz 75 db notes: 1. measured over the operating temperature range 2. slew rate is measured on rising and falling edges el5027
3 electrical specifications v s + = +5v, v s - = 0v, r l = 10k ? and c l = 10pf to 2.5v, t a = 25c unless otherwise specified. parameter description condition min typ max unit input characteristics v os input offset voltage v cm = 2.5v 1 15 mv tcv os average offset voltage drift (note 1) 5 v/c i b input bias current v cm = 2.5v 2 50 na r in input impedance 1g ? c in input capacitance 1.35 pf a v voltage gain 0.5 v out 4.5v 0.995 1.005 v/v output characteristics v ol output swing low i l = -5ma 80 150 mv v oh output swing high i l = 5ma 4.85 4.92 v i sc short circuit current short to gnd 120 ma power supply performance psrr power supply rejection ratio v s is moved from 4.5v to 15.5v 55 80 db i s supply current (per buffer) no load 110 160 a dynamic performance sr slew rate (note 2) 1v v out 4v, 20% to 80% 0.7 1.2 v/s t s settling to +0.1% v o = 2v step 900 ns bw -3db bandwidth r l = 10k ? , c l = 10pf 2.5 mhz cs channel separation f = 5mhz 75 db notes: 1. measured over the operating temperature range 2. slew rate is measured on rising and falling edges el5027
4 electrical specifications v s + = +15v, v s - = 0v, r l = 10k ? and c l = 10pf to 7.5v, t a = 25c unless otherwise specified. parameter description condition min typ max unit input characteristics v os input offset voltage v cm = 7.5v 1 15 mv tcv os average offset voltage drift (note 1) 5 v/c i b input bias current v cm = 7.5v 2 50 na r in input impedance 1g ? c in input capacitance 1.35 pf a v voltage gain 0.5 v out 14.5v 0.995 1.005 v/v output characteristics v ol output swing low i l = -5ma 80 150 mv v oh output swing high i l = 5ma 14.85 14.92 v i sc short circuit current short to gnd 120 ma power supply performance psrr power supply rejection ratio v s is moved from 4.5v to 15.5v 55 80 db i s supply current (per buffer) no load 110 160 a dynamic performance sr slew rate (note 2) 1v v out 14v, 20% to 80% 0.7 1.2 v/s t s settling to +0.1% v o = 2v step 900 ns bw -3db bandwidth r l = 10k ? , c l = 10pf 2.5 mhz cs channel separation f = 5mhz 75 db notes: 1. measured over the operating temperature range 2. slew rate is measured on rising and falling edges el5027
5 typical performance curves figure 1. frequency response for various r l figure 2. frequency response for various c l figure 3. output impedance vs frequency f igure 4. maximum output swing vs frequency figure 5. input voltage noise spectral density vs frequency figure 6. total harmonic distortion + noise vs frequency 20 10 0 -10 -20 -30 1k 10k 100k 1m 10m frequency (hz) normalized magnitude (db) 1k ? 10k ? 562 ? 150 ? c l = 10pf v s = 5v 20 10 0 -10 -20 -30 1k 10k 100k 1m 10m frequency (hz) normalized magnitude (db) 12pf 1nf 100pf r l = 10k ? v s = 5v 47pf 2000 1600 1200 800 400 0 1k 10k 100k 1m frequency (hz) output impedance ( ? ) t a = 25c v s = 5v 12 10 8 6 4 0 10k 100k 1m 10m frequency (hz) maximum output swing (v p-p ) 2 v s = 5v r l = 10k ? c l = 12pf t a = 25c 300 100 10 1k 10k 100k 10m 100m frequency (hz) voltage noise (nv/ hz) 1m 0.12 0.1 0.08 0.06 0.04 0.02 0 1k 10k 100k frequency (hz) thd + noise (%) el5027
6 figure 7. small signal overshoot vs load capacitance figure 8. input offset voltage distribution figure 9. input bias current vs temperature fi gure 10. output high voltage vs temperature figure 11. output low voltage vs temperat ure figure 12. voltage gain vs temperature typical performance curves (continued) 100 30 20 0 10 100 1k capacitance (pf) overshoot (%) 90 70 50 80 60 40 v s = 5v r l = 10k ? v in = 50mv t a = 25c 18 16 14 12 10 8 6 4 2 0 -10 -8 -6 -4 -2 0 2 4 6 8 10 input offset voltage (mv) % of buffers 3.5 3 2.5 2 1.5 1 85 temperature (c) input bias current (na) -35-15 5 254565 v s = 5v 4.955 4.95 4.945 4.94 4.935 4.925 85 temperature (c) output high voltage (v) -35-15 5 254565 4.93 v s = 5v i out = 5ma -4.938 -4.958 85 temperature (c) output low voltage (v) -35-15 5 254565 v s = 5v i out = -5ma -4.942 -4.946 -4.95 -4.954 1.0045 1.004 1.003 1.0025 1.002 1.001 85 temperature (c) voltage gain (v/v) -35 -15 5 25 45 65 1.0015 1.0035 v s = 5v el5027
7 figure 13. slew rate vs temperature figure 14. supply current per channel vs temperature figure 15. supply current per channel vs suppy voltage figure 16. large signal transient response figure 17. small signal transient response typical performance curves (continued) 2.255 2.245 2.235 2.225 2.215 80 temperature (c) slew rate (v/s) -40 v s =5v 40 0 -20 60 20 0.185 0.18 0.175 0.17 0.16 85 temperature (c) supply current (ma) -35 -15 5 25 45 65 0.165 v s = 5v 0.195 0.19 0.185 0.175 0.165 18 supply voltage (v) supply current (ma) 4 6 8 12 14 16 0.17 t a = 25c 0.18 10 4s/div 1v/div 1s/div 20mv/div el5027
8 applications information product description the el5027 unity gain buffer is fabricated using a high voltage cmos process. it exhibits rail-to-rail input and output capability and has low power consumption (500a per buffer). these features make the el5027 ideal for a wide range of general-purpose applications. when driving a load of 10k ? and 12pf, the el5027 has a -3db bandwidth of 2.5mhz and exhibits 2.2v/s slew rate. operating voltage, input, and output the el5027 is specified with a single nominal supply voltage from 5v to 15v or a split supply with its total range from 5v to 15v. correct operation is gua ranteed for a supply range of 4.5v to 16.5v. most el5027 sp ecifications are stable over both the full supply range and operating temperatures of -40c to +85c. parameter variations with operating voltage and/or temperature are shown in the typical performance curves. the output swings of the el502 7 typically extend to within 80mv of positive and negative supply rails with load currents of 5ma. decreasing load cu rrents will extend the output voltage range even closer to the supply rails. figure 1 shows the input and output waveforms for the device. operation is from 5v supply with a 10k ? load connected to gnd. the input is a 10v p-p sinusoid. the output voltage is approximately 9.985v p-p . figure 18. operation with rail-to-rail input and output short circuit current limit the el5027 will limit the short circuit current to 120ma if the output is directly shorted to the positive or the negative supply. if an output is shorted indefinitely, the power dissipation could easily increase such that the device may be damaged. maximum reliability is maintained if the output continuous current never exceeds 30ma. this limit is set by the design of the internal metal interconnects. output phase reversal the el5027 is immune to phase reversal as long as the input voltage is limited from v s - -0.5v to v s + +0.5v. figure 2 shows a photo of the output of the device with the input pin descriptions 6-pin tsot pin name function equivalent circuit 1 vina buffer a input circuit 1 2 vs- negative supply voltage 3 vinb buffer b input (reference circuit 1) 4 voutb buffer b output circuit 2 5 vs+ positive supply voltage 6 vouta buffer a output (reference circuit 2) v s + v s - v s + gnd v s - output input 5v 5v 10s v s =5v t a =25c v in =10v p-p el5027
9 voltage driven beyond the supply rails. although the device's output will not change phase, the input's overvoltage should be avoided. if an input voltage exceeds supply voltage by more than 0.6v, electrostatic protection diodes placed in the input stage of the device begin to conduct and overvoltage damage could occur. figure 19. operation with beyond-the-rails input power dissipation with the high-output drive capabi lity of the el5027 buffer, it is possible to exceed the 125c 'absolute-maximum junction temperature' under certain load current conditions. therefore, it is important to calculate the maximum junction temperature for the application to determine if load conditions need to be modified for the buffer to remain in the safe operating area. the maximum power dissipation allowed in a package is determined according to: where: t jmax = maximum junction temperature t amax = maximum ambient temperature ja = thermal resistance of the package p dmax = maximum power dissipation in the package the maximum power dissipation actually produced by an ic is the total quiescent supply current times the total power supply voltage, plus the power in the ic due to the loads, or: when sourcing, and: when sinking. where: i = 1 to 2 for dual buffer v s = total supply voltage i smax = maximum supply current per channel v out i = maximum output voltage of the application i load i = load current if we set the two p dmax equations equal to each other, we can solve for r load i to avoid device overheat. figure 20 and figure 21 provide a convenient way to see if the device will overheat. the maximum safe power dissipation can be found graphically, based on the package type and the ambient temperature. by using th e previous equation, it is a simple matter to see if p dmax exceeds the device's power derating curves. unused buffers it is recommended that any unused buffer have the input tied to the ground plane. driving capacitive loads the el5027 can drive a wide range of capacitive loads. as load capacitance increases, however, the -3db bandwidth of the device will decrease and the peaking increase. the buffers drive 10pf loads in parallel with 10k ? with just 1.5db of peaking, and 100pf with 6.4db of peaking. if less peaking is desired in these applicatio ns, a small series resistor (usually between 5 ? and 50 ? ) can be placed in series with the output. however, this wi ll obviously reduce the gain slightly. another method of reducing peaking is to add a "snubber" circuit at the output . a snubber is a shunt load consisting of a resistor in series with a capacitor. values of 150 ? and 10nf are typical. the advantage of a snubber is that it does not draw any dc load current or reduce the gain. power supply bypassing and printed circuit board layout the el5027 can provide gain at high frequency. as with any high frequency device, good printed circuit board layout is necessary for optimum performance. ground plane construction is highly recommended, lead lengths should be as short as possible, and the power supply pins must be well bypassed to reduce the risk of oscillation. for normal single supply operation, where the v s - pin is connected to ground, a 0.1f ceramic capacitor should be placed from v s + to pin to v s - pin. a 4.7f tantalum capacitor should then be connected in parallel, placed in the region of the buffer. one 4.7f capacitor may be used for multiple devices. this same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. 1v 1v 10s v s =2.5v t a =25c v in =6v p-p p dmax t jmax - t amax ja -------------------------------------------- - = p dmax iv [ s i smax v s + ( - v out i ) i load i ] + = p dmax iv [ s i smax v ( out i - v s - ) i load i + ] = el5027
10 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts 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 intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com el5027
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