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general description the max4090 3v/5v, 6db video buffer with sync-tip clamp, and low-power shutdown mode is available in tiny sot23 and sc70 packages. the max4090 is designed to drive dc-coupled, 150 ? back-terminated video loads in portable video applications such as digi- tal still cams, portable dvd players, digital camcorders, pdas, video-enabled cell phones, portable game sys- tems, and notebook computers. the input clamp posi- tions the video waveform at the output and allows the max4090 to be used as a dc-coupled output driver. the max4090 operates from a single 2.7v to 5.5v sup- ply and consumes only 6.5ma of supply current. the low-power shutdown mode reduces the supply current to 150na, making the max4090 ideal for low-voltage, battery-powered video applications. the max4090 is available in tiny 6-pin sot23 and sc70 packages and is specified over the extended -40 c to +85 c temperature range. applications portable video/game systems/dvd players digital camcorders/televisions/still cameras pdas video-enabled cell phones notebook computers portable/flat-panel displays features ? single-supply operation from 2.7v to 5.5v ? input sync-tip clamp ? dc-coupled output ? low-power shutdown mode reduces supply current to 150na ? available in space-saving sot23 and sc70 packages max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current ________________________________________________________________ maxim integrated products 1 part temp range pin- package top mark max4090ext-t -40? to +85? 6 sc70-6 abm MAX4090EUT-T -40? to +85? 6 sot23-6 abox ordering information gnd v cc in 16 fb 5 shdn out max4090 sc70/sot23 top view 2 34 pin configuration 19-2813; rev 2; 8/04 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. max4090 clamp 1.2k ? 2.3k ? 580 ? 780 ? in out fb shdn gnd v cc top view block diagram
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = 3.0v, gnd = 0v, c in = 0.1? from in to gnd, r l = infinity to gnd, fb shorted to out, shdn = 3.0v, t a = -40? to +85?. typical values are at t a = +25?, unless otherwise noted.) (note 2) 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. note 1: v clp is the input clamp voltage as defined in the dc electrical characteristics table. v cc to gnd ............................................................. -0.3v to +6v out, fb, shdn to gnd............................ -0.3v to (v cc + 0.3v) in to gnd (note 1) ................................... v clp to (v cc + 0.3v) in short-circuit duration from -0.3v to v clp ........................1min output short-circuit duration to v cc or gnd .......... continuous continuous power dissipation (t a = +70 c) 6-pin sot23 (derate 8.7mw/? above +70?) ...........695mw 6-pin sc70 (derate 3.1mw/? above +70?) .............245mw operating temperature range ..........................-40? to +85? junction temperature .....................................................+150? storage temperature range ............................-65? to +150? lead temperature (soldering, 10s) ................................+300? parameter symbol conditions min typ max units supply voltage range v cc guaranteed by psrr 2.7 5.5 v v cc = 3v 6.5 10 quiescent supply current i cc v in = v clp v cc = 5v 6.5 10 ma shutdown supply current i shdn shdn = 0v 0.15 1a input clamp voltage v clp input referred 0.27 0.38 0.47 v input voltage range v in inferred from voltage gain (note 3) v clp 1.45 v input bias current i bias v in = 1.45v 22.5 35 ? input resistance v clp + 0.5v < v in < v clp + 1v 3 m ? voltage gain a v r l = 150 ? , 0.5v < v in < 1.45v (note 4) 1.9 2 2.1 v/v power-supply rejection ratio psrr 2.7v < v cc < 5.5v 60 80 db v cc = 3v 2.55 2.7 output voltage high swing v oh r l = 150 ? to gnd v cc = 5v 4.3 4.6 v output voltage low swing v ol r l = 150 ? to gnd v clp 0.47 v sourcing, r l = 20 ? to gnd 45 85 output current i out sinking, r l = 20 ? to v cc 40 85 ma output short-circuit current i sc out shorted to v cc or gnd 110 ma shdn logic-low threshold v il v cc x 0.3 v shdn logic-high threshold v ih v cc x 0.7 v shdn input current i ih 0.003 1a at dc 4 shutdown output impedance r out ( disabled ) shdn = 0v at 3.58mhz or 4.43mhz 2 k ?
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current _______________________________________________________________________________________ 3 note 2: all devices are 100% production tested at t a = +25?. specifications over temperature limits are guaranteed by design. note 3: voltage gain (a v ) is referenced to the clamp voltage, i.e., an input voltage of v in = v clp + vi would produce an output volt- age of v out = v clp + a v x vi. note 4: droop is guaranteed by the input bias current specification. ac electrical characteristics (v cc = 3.0v, gnd = 0v, fb shorted to out, c in = 0.1?, r in = 75 ? to gnd, r l = 150 ? to gnd, shdn = v cc , t a = +25?, unless otherwise noted.) parameter symbol conditions min typ max units small-signal -3db bandwidth bw ss v out = 100mv p-p 55 mhz large-signal -3db bandwidth bw ls v out = 2v p-p 45 mhz small-signal 0.1db gain flatness bw 0.1dbss v out = 100mv p-p 25 mhz large-signal 0.1db gain flatness bw 0.1dbls v out = 2v p-p 17 mhz slew rate sr v out = 2v step 275 v/? settling time to 0.1% t s v out = 2v step 25 ns power-supply rejection ratio psrr f = 100khz 50 db output impedance z out f = 5mhz 2.5 ? v cc = 3v 1 differential gain dg ntsc v cc = 5v 0.5 % v cc = 3v 0.8 differential phase dp ntsc v cc = 5v 0.5 degrees group delay d/dt f = 3.58mhz or 4.43mhz 20 ns peak signal to rms noise snr v in = 1v p-p , 10mhz bw 65 db droop c in = 0.1? (note 4) 2 3 % shdn enable time t on v in = v clp + 1v, shdn = 3v, v out settled to within 1% of the final voltage 250 ns shdn disable time t off v in = v clp + 1v, shdn = 0v, v out settled to below 1% of the output voltage 50 ns
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current 4 _______________________________________________________________________________________ t ypical operating characteristics (v cc = 3.0v, gnd = 0v, fb shorted to out, c in = 0.1?, r in = 75 ? to gnd, r l = 150 ? to gnd, shdn = v cc , t a = +25?, unless otherwise noted.) small-signal gain vs. frequency max4090 toc01 frequency (hz) gain (db) 10m 1m -5 -4 -3 -2 -1 0 1 2 3 -6 100k 100m a v = 2 v cc = 3v v out = 100mv p-p small-signal gain flatness vs. frequency max4090 toc02 frequency (hz) gain (db) 10m 1m -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 -0.6 100k 100m a v = 2 v cc = 3v v out = 100mv p-p small-signal gain vs. frequency max4090 toc03 frequency (hz) gain (db) 10m 1m -5 -4 -3 -2 -1 0 1 2 3 -6 100k 100m a v = 2 v cc = 5v v out = 100mv p-p small-signal gain flatness vs. frequency max4090 toc04 frequency (hz) gain (db) 10m 1m -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 -0.6 100k 100m a v = 2 v cc = 5v v out = 100mv p-p large-signal gain vs. frequency max4090 toc05 frequency (hz) gain (db) 10m 1m -5 -4 -3 -2 -1 0 1 2 3 -6 100k 100m a v = 2 v cc = 3v v out = 2v p-p large-signal gain flatness vs. frequency max4090 toc06 frequency (hz) gain (db) 10m 1m -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 -0.6 100k 100m a v = 2 v cc = 3v v out = 2v p-p large-signal gain vs. frequency max4090 toc07 frequency (hz) gain (db) 10m 1m -5 -4 -3 -2 -1 0 1 2 3 -6 100k 100m a v = 2 v cc = 5v v out = 2v p-p large-signal gain flatness vs. frequency max4090 toc08 frequency (hz) gain (db) 10m 1m -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 -0.6 100k 100m a v = 2 v cc = 5v v out = 2v p-p power-supply rejection ratio vs. frequency max4090 toc09 frequency (hz) psrr (db) 10m 1m 100k -70 -60 -50 -40 -30 -20 -10 0 -80 10k 100m v cc = 3v
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current _______________________________________________________________________________________ 5 power-supply rejection ratio vs. frequency max4090 toc10 frequency (hz) psrr (db) 10m 1m 100k -70 -60 -50 -40 -30 -20 -10 0 -80 10k 100m v cc = 5v quiescent supply current vs. temperature max4090 toc11 temperature ( c) supply current (ma) 75 50 25 0 -25 6.35 6.40 6.45 6.50 6.55 6.60 6.65 6.70 6.75 6.80 6.30 -50 100 v cc = 3v v cc = 5v clamp voltage vs. temperature max4090 toc12 temperature ( c) v clamp (v) 75 50 -25 0 25 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.20 -50 100 v cc = 3v clamp voltage vs. temperature max4090 toc13 temperature ( c) v clamp (v) 75 50 -25 0 25 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.20 -50 100 v cc = 5v voltage gain vs. temperature max4090 toc14 temperature ( c) gain (v/v) 75 50 25 0 -25 1.95 2.00 2.05 2.10 1.90 -50 100 v cc = 3v voltage gain vs. temperature max4090 toc15 temperature ( c) gain (v/v) 75 50 25 0 -25 1.95 2.00 2.05 2.10 1.90 -50 100 v cc = 5v output voltage high swing vs. temperature max4090 toc16 temperature ( c) output voltage high (v) 75 50 25 0 -25 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 2.0 -50 100 v cc = 3v output voltage high swing vs. temperature max4090 toc17 temperature ( c) output voltage high (v) 75 50 25 0 -25 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 4.0 -50 100 v cc = 5v large-signal pulse response max4090 toc18 v out 1v/div v in 500mv/div 10ns/div t ypical operating characteristics (continued) (v cc = 3.0v, gnd = 0v, fb shorted to out, c in = 0.1?, r in = 75 ? to gnd, r l = 150 ? to gnd, shdn = v cc , t a = +25?, unless otherwise noted.)
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current 6 _______________________________________________________________________________________ small-signal pulse response max4090 toc19 v out 50mv/div v in 25mv/div 10ns/div t ypical operating characteristics (continued) (v cc = 3.0v, gnd = 0v, fb shorted to out, c in = 0.1?, r in = 75 ? to gnd, r l = 150 ? to gnd, shdn = v cc , t a = +25?, unless otherwise noted.) differential gain and phase -1.0 -2.0 0 1.0 2.0 differential phase ( ) differential gain (%) max4090 toc20 0123456 0123456 -0.5 -1.0 0 0.5 1.0 pin description t ypical application circuit max4090 clamp in out fb gnd v cc shdn r l r in pin name function 1 out video output 2 gnd ground 3i n video input 4v cc power-supply voltage. bypass with a 0.1? capacitor to ground as close to pin as possible. 5 shdn shutdown. pull shdn low to place the max4090 in low-power shutdown mode. 6f b feedback. connect to out.
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current _______________________________________________________________________________________ 7 detailed description the max4090 3v/5v, 6db video buffer with sync-tip clamp and low-power shutdown mode is available in tiny sot23 and sc70 packages. the max4090 is designed to drive dc-coupled, 150 ? back-terminated video loads in portable video applications such as digital still cams, portable dvd players, digital camcorders, pdas, video- enabled cell phones, portable game systems, and note- book computers. the input clamp positions the video waveform at the output and allows the max4090 to be used as a dc-coupled output driver. the max4090 operates from a single 2.7v to 5.5v sup- ply and consumes only 6.5ma of supply current. the low-power shutdown mode reduces the supply current to 150na, making the max4090 ideal for low-voltage, battery-powered video applications. the input signal to the max4090 is ac-coupled through a capacitor into an active sync-tip clamp cir- cuit, which places the minimum of the video signal at approximately 0.38v. the output buffer amplifies the video signal while still maintaining the 0.38v clamp volt- age at the output. for example, if v in = 0.38v, then v out = 0.38v. if v in = (0.38v + 1v) = 1.38v, then v out = (0.38v + 2 x (1v)) = 2.38v. the net result is that a 2v video output signal swings within the usable output voltage range of the output buffer when v cc = 3v. shutdown mode the max4090 features a low-power shutdown mode (i shdn = 150na) for battery-powered/portable applica- tions. pulling the shdn pin high enables the output. connecting the shdn pin to ground (gnd) disables the output and places the max4090 into a low-power shutdown mode. applications information input coupling the max4090 the max4090 input must be ac-coupled because the input capacitor stores the clamp voltage. the max4090 requires a typical value of 0.1? for the input clamp to meet the line droop specification. a minimum of a ceramic capacitor with an x7r temperature coefficient is recommended to avoid temperature-related prob- lems with line droop. for extended temperature opera- tion, such as outdoor applications, or where the impressed voltage is close to the rated voltage of the capacitor, a film dielectric is recommended. increasing the capacitor value slows the clamp capture time. values above 0.5f should be avoided since they do not improve the clamp? performance. the active sync-tip clamp also requires that the input impedance seen by the input capacitor be less than 100 ? typically to function properly. this is easily met by the 75 ? input resistor prior to the input-coupling capacitor and the back termination from a prior stage. insufficient input resistance to ground causes the max4090 to appear to oscillate. never operate the max4090 in this mode. using the max4090 with the reconstruction filter in most video applications, the video signal generated from the dac requires a reconstruction filter to smooth out the signal and attenuate the sampling aliases. the max4090 is a direct dc-coupled output driver, which can be used after the reconstruction filter to drive the video signal. the driving load from the video dac can be varied from 75 ? to 300 ? . a low input impedance (<100 ? ) is required by the max4090 in normal opera- tion, special care must be taken when a reconstruction filter is used in front of the max4090. for standard video signal, the video passband is about 6mhz and the system oversampling frequency is at 27mhz. normally, a 9mhz bw lowpass filter can be used for the reconstruction filter. this section demon- strates the methods to build simple 2nd- and 3rd-order passive butterworth lowpass filters at the 9mhz cutoff frequency and the techniques to use them with the max4090 (figures 1 and 4). 2nd-order butterworth lowpass filter realization table 1 shows the normalized 2nd-order butterworth lpf component values at 1rad/s with a source/load impedance of 1 ? . with the following equations, the l and c can be calcu- lated for the cutoff frequency at 9mhz. table 2 shows the appropriated l and c values for different source/ load impedance, the bench measurement values for the -3db bw and attenuation at 27mhz. there is approximately 20db attenuation at 27mhz, which effec- tively attenuates the sampling aliases. the max4090 requires low input impedance for stable operation and it does not like the reactive input impedance. for r1/r2 greater than 100 ? , a series resistor r is (figure 1) r n 1 = r n 2 ( ? )c n 1 (f) l n 1 (h) 1 1.414 1.414 table 1. 2nd order butterworth lowpass filter normalized values
max4090 between 20 ? to 100 ? is needed to isolate the input capacitor (c4) to the filter to prevent the oscillation problem. figure 2 shows the frequency response for r1 = r2 = 150 ? . at 6mhz, the attenuation is about 1.4db. the attenuation at 27mhz is about 20db. figure 3 shows the multiburst response for r1 = r2 = 150 ? . 3rd-order butterworth lowpass filter realization if more flat passband and more stopband attenuation are needed, a 3rd-order lpf can be used. the design procedures are similar to the 2nd-order butterworth lpf. table 3 shows the normalized 3rd-order butterworth lowpass filter with the cutoff frequency at 1 rad/s and the stopband frequency at 3 rad/s. table 4 shows the appropriated l and c values for different source/load impedance and the bench measurement values for -3db bw and attenuation at 27mhz. the attenuation is over 40db at 27mhz. at 6mhz, the attenuation is approximately 0.6db for r1 = r2 = 150 ? (figure 5). c c fr l lr f n cl nl c == 22 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current 8 _______________________________________________________________________________________ 0.1 1 10 100 frequency response frequency (mhz) gain (db) 0 -60 -50 -40 -30 -20 -10 r2 150 ? r1 150 ? c1 150pf l1 3.9 h c4 0.1 f r3 75 ? c7 1 f in out gnd fb shdn v cc v cc v cc v out 4 2 3 56 1 video current dac r is 49.9 ? 2-pole reconstruction lpf max4090 figure 1. 2nd-order butterworth lpf with max4090 figure 2. frequency response v out 500mv/div 10 s/div v in 500mv/div figure 3. multiburst response
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current _______________________________________________________________________________________ 9 r1 = r2 ( ? ) c1 (p f ) l1 (h) r is ( ? ) 3db bw (mhz) a t t en u a t i o n at 27mhz (db) 75 330 1.8 0 8.7 20 150 150 3.9 50 9.0 20 200 120 4.7 50 9.3 22 300 82 8.2 100 8.7 20 table 2. bench measurement values rn1 = rn2 ( ? ) cn1 (f) cn2 (f) cn3 (f) ln1 (h) 1 0.923 0.923 0.06 1.846 table 3. 3rd-order butterworth lowpass filter normalized values r2 150 ? r1 150 ? c1 120pf c2 120pf l1 4.7 h c3 6.8pf c4 0.1 f r3 75 ? c7 1 f in out gnd fb shdn v cc v cc v cc v out 4 2 3 56 1 video current dac r is 49.9 ? 3-pole reconstruction lpf max4090 figure 4. 3rd-order butterworth lpf with max4090 r1 = r2 ( ? ) c1 (pf) c2 (pf) c3 (pf) l (h) r is ( ? ) 3db bw (mhz) attenuation at 27mhz (db) 75 220 220 15.0 2.2 0 9.3 43 150 120 120 6.8 4.7 50 8.9 50 300 56 56 3.3 10.0 100 9.0 45 table 4. bench measurement values sag correction in a 5v application, the max4090 can use the sag con- figuration if an ac-coupled output video signal is required. sag correction refers to the low-frequency compensation for the highpass filter formed by the 150 ? load and the output capacitor. in video applica- tions, the cutoff frequency must be low enough to pass the vertical sync interval to avoid field tilt. this cutoff frequency should be less than 5hz, and the coupling capacitor must be very large in normal configuration, typically > 220?. in sag configuration, the max4090 eliminates the need for large coupling capacitors, and instead requires two 22? capacitors (figure 6) to reach the same performance as the large capacitor. bench experiments show that increasing the output coupling capacitor c5 beyond 47? does not improve the performance. if the supply voltage is less than 4.5v, the sag correction is not recommended for the max4090.
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current 10 ______________________________________________________________________________________ 0.1 1 10 100 frequency response frequency (mhz) gain (db) 0 -60 -50 -40 -30 -20 -10 figure 5. frequency response for r1 = r2 = 150 ? r2 150 ? r1 150 ? c1 120pf c2 120pf l1 4.7 h c3 6.8pf c4 0.1 f r3 75 ? c5 22 f c6 22 f c7 1 f in out gnd fb shdn v cc v cc v cc v out 4 2 3 56 1 video current dac r is 49.9 ? 3-pole reconstruction lpf max4090 figure 6. sag correction configuration layout and power-supply bypassing the max4090 operates from single 2.7v to 5.5v sup- ply. bypass the supply with a 0.1? capacitor as close to the pin as possible. maxim recommends using microstrip and stripline techniques to obtain full band- width. to ensure that the pc board does not degrade the device? performance, design it for a frequency greater than 1ghz. pay careful attention to inputs and outputs to avoid large parasitic capacitance. whether or not you use a constant-impedance board, observe the following design guidelines: do not use wire-wrap boards; they are too inductive. do not use ic sockets; they increase parasitic capacitance and inductance. use surface-mount instead of through-hole compo- nents for better, high-frequency performance. use a pc board with at least two layers; it should be as free from voids as possible. keep signal lines as short and as straight as possible. do not make 90 turns; round all corners.
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current ______________________________________________________________________________________ 11 figure 7. typical operating circuit max4090 clamp in out fb gnd v cc shdn r l 75 ? r in 75 ? c byp 0.1 f r out 75 ? v cc = 2.7v to 5.5v c in 0.1 f r source 75 ? e signal e out chip information transistor count: 755 process: bicmos
max4090 3v/5v, 6db video buffer with sync-tip clamp and 150na shutdown current 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 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) (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 .) 6lsot.eps f 1 1 21-0058 package outline, sot-23, 6l

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