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general description operating from a 1.8v single power supply, the max9509/ max9510 amplify standard-definition video signals and only consume 5.8mw quiescent power and 11.7mw average power. the max9509/max9510 leverage maxim? directdrive technology to generate a clean, internal negative supply. combining the internal nega- tive power supply with the external positive 1.8v sup- ply, the max9509/max9510 are able to drive a 2v p-p video signal into a 150 ? load. besides increasing the output voltage range, maxim? directdrive technology eliminates large output-coupling capacitors and sets the output video black level near ground. directdrive requires an integrated charge pump and an internal linear regulator to create a clean negative power supply so that the amplifier can pull the sync below ground. the charge pump injects little noise into the video output, making the picture visibly flawless. the max9509/max9510 are designed to operate from the 1.8v digital power supply. the high power-supply rejec- tion ratio (49db at 100khz) allows the max9509/ max9510 to reject the noise from the digital power supply. the max9509 features an internal reconstruction filter that smoothes the steps and reduces the spikes on the video signal from the video digital-to-analog converter (dac). the reconstruction filter typically has ?db passband flatness of 8.1mhz and 46db attenuation at 27mhz. the large-signal, ?db passband flatness of the max9510 video amplifier is typically 8.4mhz, and the large signal -3db frequency is typically 11.4mhz. the input of the max9509/max9510 can be directly connected to the output of a video dac. the max9509/ max9510 also feature a transparent input sync-tip clamp, allowing ac-coupling of input signals with differ- ent dc biases. the max9509/max9510 have an inter- nal fixed gain of 8. the input full-scale video signal is nominally 0.25v p-p , and the output full-scale video sig- nal is nominally 2v p-p . the devices operate from a 1.8v or 2.5v single supply and feature a 10na low-power shutdown mode. the max9509 is offered in an 8-pin tdfn package and the max9510 is offered in an 8-pin ?ax package. features 5.8mw quiescent power consumption 11.7mw average power consumption 1.8v or 2.5v single-supply operation reconstruction filter with 8.1mhz passband and 46db attenuation at 27mhz (max9509) directdrive sets video output black level near ground dc-coupled input/output transparent input sync-tip clamp internal fixed gain of 8 10na shutdown supply current max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers ________________________________________________________________ maxim integrated products 1 0v 2v p-p video max9509 max9510 a v = 8v/v linear regulator charge pump transparent clamp out in *for max9509 250mv p-p video lpf* shdn block diagram ordering information part reconstruction filter pin-package top mark package code max9509 ata+t yes 8 tdfn-ep* aaz t822-1 max9510 aua+t no 8 ?ax-8 u8-1 19-0727; rev 1; 4/07 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. pin configurations appear at end of data sheet. note: all devices are specified over the -40? to +125? operating temperature range. + denotes lead-free package. * ep = exposed pad. ?ax is a registered trademark of maxim integrated products, inc. evaluation kit available digital still cameras (dsc) digital video cameras (dvc) portable media players (pmp) mobile phones security/cctv cameras automotive applications applications
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = shdn = 1.8v, gnd = 0v, out has r l = 150 ? connected to gnd, c1 = c2 = 1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) 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. (voltages with respect to gnd.) v dd ..........................................................................-0.3v to +3v in ................................................................-0.3v to (v dd + 0.3v) out .......................(the greater of v ss and -1v) to (v dd + 0.3v) shdn ........................................................................-0.3v to +4v c1p ............................................................-0.3v to (v dd + 0.3v) c1n ............................................................(v ss - 0.3v) to +0.3v v ss ...........................................................................-3v to +0.3v duration of out short circuit to v dd , gnd, and v ss .........................................................continuous continuous current in, shdn .......................................................................?0ma continuous power dissipation (t a = +70?) 8-pin tdfn (derate 11.9mw/? above +70?) .........953.5mw 8-pin ?ax (derate 4.5mw/? above +70?) ..............362mw operating temperature range ........................-40? to +125? 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 dd guaranteed by psrr 1.700 2.625 v max9509 3.1 5.3 supply current i dd no load max9510 2.9 4.9 ma shutdown supply current i shdn shdn = gnd 0.01 10 ? output level in = 80mv -75 +5 +75 mv dc-coupled input 1.7v v dd 2.625v 0 262.5 input voltage range guaranteed by output voltage swing 2.375v v dd 2.625v 0 325 mv input current i b in = 130mv 2 3.2 ? input resistance r in 10mv in 250mv 280 k ? ac-coupled input sync-tip clamp level v clp c in = 0.1? -8 0 +11 mv 1.7v v dd 2.625v 252.5 input-voltage swing guaranteed by output voltage swing 2.375v v dd 2.625v 325 mv p-p sync crush percentage reduction in sync pulse at output, r source = 37.5 ? , c in = 0.1? 1.6 % input clamping current in = 130mv 2 3.2 ? line time distortion c in = 0.1? 0.2 % minimum input source resistance 25 ?
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v dd = shdn = 1.8v, gnd = 0v, out has r l = 150 ? connected to gnd, c1 = c2 = 1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units dc characteristics dc voltage gain a v guaranteed by output voltage swing (note 2) 7.84 7.95 8.16 v/v 0v v in 262.5mv, dc-coupled input 2.058 2.1 2.142 1.7v v dd 2.625v 0v v in 252.5mv p-p , ac-coupled input 1.979 2.02 2.061 output voltage swing 2.375v v dd 2.625v 0v v in 325mv 2.548 2.6 2.652 v p-p power-supply rejection ratio psrr 1.7v v dd 2.625v, measured between 75 ? load resistors 46 60 db shutdown input resistance 0v in v dd , shdn = gnd 25 m ? output resistance r out out = 0v, -5ma i load +5ma 0.1 ? shutdown output resistance 0v out v dd , shdn = gnd 32 m ? out leakage current shdn = gnd 1 a sourcing 82 output short-circuit current sinking 32 ma ac characteristics (max9509) ?db passband flatness 8.1 mhz f = 5.5mhz +0.15 f = 10mhz -3 standard-definition reconstruction filter out = 2v p-p , reference frequency is 100khz f = 27mhz -46 db f = 3.58mhz 1.04 differential gain dg f = 4.43mhz 1.16 % f = 3.58mhz 0.54 differential phase dp f = 4.43mhz 0.52 degrees group-delay distortion 100khz f 5mhz, out = 2v p-p 14 ns peak signal to rms noise 100khz f 5mhz 64 db power-supply rejection ratio psrr f = 100khz, 100mv p-p 49 db 2t pulse-to-bar k rating 2t = 200ns, bar time is 18?, the beginning 2.5% and the ending 2.5% of the bar time are ignored 0.1 k% 2t pulse response 2t = 200ns 0.3 k% 2t bar response 2t = 200ns, bar time is 18?, the beginning 2.5% and the ending 2.5% of the bar time are ignored 0.1 k% nonlinearity 5-step staircase 0.2 % output impedance f = 5mhz, in = 80mv 6.4 ?
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 4 _______________________________________________________________________________________ parameter symbol conditions min typ max units out-to-in isolation shdn = gnd, f 5.5mhz 102 db in-to-out isolation shdn = gnd, f 5.5mhz 99 db ac characteristics (max9510) small-signal -3db bandwidth out = 100mv p-p 42.1 mhz large-signal -3db bandwidth out = 2v p-p 11.4 mhz small-signal 1db flatness out = 100mv p-p 36.1 mhz large-signal 1db flatness out = 2v p-p 8.4 mhz slew rate out = 2v step 43 v/? settling time to 0.1% out = 2v step 124 ns f = 3.58mhz 0.70 differential gain dg f = 4.43mhz 0.93 % f = 3.58mhz 0.69 differential phase dp f = 4.43mhz 0.83 degrees group-delay distortion 100khz f 5mhz, out = 2v p-p 6ns peak signal to rms noise 100khz f 5mhz 67 db power-supply rejection ratio psrr f = 100khz, 100mv p-p 45 db 2t pulse-to-bar k rating 2t = 200ns, bar time is 18?, the beginning 2.5% and the ending 2.5% of the bar time are ignored 0.2 k% 2t pulse response 2t = 200ns 0.2 k% 2t bar response 2t = 200ns, bar time is 18?, the beginning 2.5% and the ending 2.5% of the bar time are ignored 0.1 k% nonlinearity 5-step staircase 0.1 % output impedance f = 5mhz, in = 80mv 7.3 ? out-to-in isolation shdn = gnd, f 5mhz 98 db in-to-out isolation shdn = gnd, f 5mhz 94 db charge pump switching frequency 325 625 1150 khz shdn input logic-low threshold v il v dd = 1.7v to 2.625v 0.5 v logic-high threshold v ih v dd = 1.7v to 2.625v 1.4 v logic input current i il , i ih 10 ? electrical characteristics (continued) (v dd = shdn = 1.8v, gnd = 0v, out has r l = 150 ? connected to gnd, c1 = c2 = 1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) note 1: all devices are 100% production tested at t a = +25?. specifications over temperature limits are guaranteed by design. note 2: voltage gain (a v ) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing.
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers _______________________________________________________________________________________ 5 small-signal gain vs. frequency max9509/10 toc01 frequency (hz) gain (db) 100m 10m 1m -80 -60 -40 -20 0 20 -100 100k 1g max9510 max9509 v out = 100mv p-p small-signal gain flatness vs. frequency max9509/10 toc02 frequency (hz) gain (db) 10m 1m -2 -1 0 1 2 -3 100k 100m max9510 max9509 v out = 100mv p-p large-signal gain vs. frequency max9509/10 toc03 frequency (hz) gain (db) 100m 10m 1m -80 -60 -40 -20 0 20 -100 100k 1g max9510 v out = 2v p-p max9509 large-signal gain flatness vs. frequency max9509/10 toc04 frequency (hz) gain (db) 10m 1m -2 -1 0 1 2 -3 100k 100m max9510 max9509 v out = 2v p-p group delay vs. frequency (max9509) max9509/10 toc05 frequency (hz) delay (ns) 10m 1m 10 20 30 40 50 60 70 80 90 100 0 100k 100m group delay vs. frequency (max9510) max9509/10 toc06 frequency (hz) delay (ns) 100m 10m 1m 8 16 24 32 40 0 100k 1g v out = 2v p-p v out = 100mv p-p typical operating characteristics (v dd = shdn = 1.8v, gnd = 0v, dc?oupled input, video output has r l = 150 ? connected to gnd, t a = +25?, unless otherwise noted.) power-supply rejection ratio vs. frequency max9509/10 toc07 frequency (hz) psrr (db) 10m 1m 100k -60 -40 -20 0 -80 10k 100m max9510 max9509 quiescent supply current vs. temperature max9509/10 toc08 temperature ( c) quiescent supply current (ma) 100 75 50 25 0 -25 3.5 3.0 2.5 4.0 2.0 -50 125 max9509 max9510
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v dd = shdn = 1.8v, gnd = 0v, dc?oupled input, video output has r l = 150 ? connected to gnd, t a = +25?, unless otherwise noted.) output voltage vs. input voltage max9509/10 toc10 input voltage (mv) output voltage (v) 350 300 250 200 150 100 50 0 -50 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -1.5 -100 400 differential gain and phase (max9509) max9509/10 toc11 dc input level (mv) differential gain (%) differential phase (deg) 200 232 168 136 104 0.2 0 0.6 0.4 0.8 -0.4 0 0.8 0.4 1.2 1.6 -0.2 71 dc input level (mv) 200 232 168 136 104 71 frequency = 3.58mhz in = 71mv p-p differential gain and phase (max9509) max9509/10 toc12 dc input level (mv) differential gain (%) differential phase (deg) 0.2 0 0.6 0.4 0.8 -0.4 0 0.8 0.4 1.2 1.6 -0.2 dc input level (mv) frequency = 4.43mhz in = 71mv p-p 200 232 168 136 104 71 200 232 168 136 104 71 differential gain and phase (max9510) max9509/10 toc13 dc input level (mv) differential gain (%) differential phase (deg) 0.2 0 0.6 0.4 0.8 -0.4 0 0.8 0.4 1.2 1.6 -0.2 dc input level (mv) frequency = 3.58mhz in = 71mv p-p 200 232 168 136 104 71 200 232 168 136 104 71 differential gain and phase (max9510) max9509/10 toc14 dc input level (mv) differential gain (%) differential phase (deg) 0.2 0 0.6 0.4 0.8 -0.4 0 0.8 0.4 1.2 1.6 -0.2 dc input level (mv) frequency = 4.43mhz in = 71mv p-p 200 232 168 136 104 71 200 232 168 136 104 71 2t response max9509/10 toc15 200ns/div in 100mv/div 0v 0v out 500mv/div 12.5t response max9509/10 toc16 400ns/div in 100mv/div 0v 0v out 500mv/div voltage gain vs. temperature max9509/10 toc09 temperature ( c) voltage gain (v/v) 100 75 50 25 0 -25 8.20 7.80 7.85 7.90 7.95 8.00 8.05 8.10 8.15 -50 125
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers _______________________________________________________________________________________ 7 output response to ntc-7 video test signal max9509/10 toc17 10 s/div in 100mv/div 0v 0v out 500mv/div pal multiburst response max9509/10 toc18 10 s/div in 100mv/div out 1v/div 0v 0v pal color bars max9509/10 toc19 10 s/div in 100mv/div out 1v/div 0v 0v field square-wave response (ac-coupled input) max9509/10 toc20 2ms/div in 100mv/div 0v 0v out 500mv/div small-signal pulse response (max9510) max9509/10 toc21 200ns/div 125mv 360mv input 6.25mv/div output 50mv/div large-signal pulse response (max9510) 200ns/div 125mv 360mv input 125mv/div output 1v/div max9509/10 toc22 typical operating characteristics (continued) (v dd = shdn = 1.8v, gnd = 0v, dc?oupled input, video output has r l = 150 ? connected to gnd, t a = +25?, unless otherwise noted.) _______________________________________________________________________________________ 7 enable response max9509/10 toc23 100 s/div v ss 1v/div out 250mv/div shdn 1v/div 0v 0v in = 0v disable response max9509/10 toc24 100 s/div v ss 1v/div out 250mv/div shdn 1v/div 0v 0v in = 0v
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 8 _______________________________________________________________________________________ 8 _______________________________________________________________________________________ detailed description the max9509/max9510 represent maxim? second generation of directdrive video amplifiers that meet the requirements of current and future portable equipment: 1.8v operation. engineers want to eliminate the 3.3v supply in favor of lower supply voltages. lower power consumption. the max9509/max9510 reduce average power consumption by up to 75% compared to the 3.3v first generation (max9503/ max9505). internal fixed gain of 8. as the supply voltages drop for system chips on deep submicron processes, the video dac can no longer create a 1v p-p signal at its output, and the gain of 2 found in the previous gen- eration of video filter amplifiers is not enough. directdrive technology is necessary for a voltage mode amplifier to output a 2v p-p video signal from a 1.8v supply. the integrated inverting charge pump creates a negative supply that increases the output range and gives the video amplifier enough headroom to drive a 2v p-p video signal with a 150 ? load. directdrive background integrated video filter amplifier circuits operate from a single supply. the positive power supply usually cre- ates video output signals that are level-shifted above ground to keep the signal within the linear range of the output amplifier. for applications where the positive dc level is not acceptable, a series capacitor can be inserted in the output connection in an attempt to elimi- nate the positive dc level shift. the series capacitor cannot truly level-shift a video signal because the aver- age level of the video varies with picture content. the series capacitor biases the video output signal around ground, but the actual level of the video signal can vary significantly depending upon the rc time constant and the picture content. the series capacitor creates a highpass filter. since the lowest frequency in video is the frame rate, which can be from 24hz to 30hz, the pole of the highpass filter should ideally be an order of magnitude lower in frequency than the frame rate. therefore, the series capacitor must be very large, typically from 220? to 3000?. for space- constrained equipment, the series capacitor is unac- ceptable. changing from a single series capacitor to a sag network that requires two smaller capacitors only reduces space and cost slightly. the series capacitor in the usual output connection also prevents damage to the output amplifier if the con- nector is shorted to a supply or to ground. while the output connection of the max9509/max9510 does not have a series capacitor, the max9509/max9510 will not be damaged if the connector is shorted to a supply or to ground (see the short-circuit protection section). pin description pin max9509 max9510 name function 11v ss charge-pump negative power supply. bypass with a 1? capacitor to gnd. 2 2 c1n charge-pump flying capacitor negative terminal. connect a 1? capacitor from c1p to c1n. 3 3 gnd ground 4 4 c1p charge-pump flying capacitor positive terminal. connect a 1? capacitor from c1p to c1n. 55v dd positive power supply. bypass with a 0.1? capacitor to gnd. 6 6 in video input 77 shdn active-low shutdown. connect to v dd for normal operation. 8 8 out video output ep ep exposed paddle. ep is internally connected to gnd. connect ep to gnd.
video amplifier if the full-scale video signal from a video dac is 250mv, the black level of the video signal created by the video dac is approximately 75mv. the max9509/max9510 shift the black level to near ground at the output so that the active video is above ground and the sync is below ground. the amplifier needs a negative supply for its out- put stage to remain in its linear region when driving sync below ground. the max9509/max9510 have an integrated charge pump and linear regulator to create a low-noise nega- tive supply from the positive supply voltage. the charge pump inverts the positive supply to create a raw negative voltage that is then fed into the linear regulator filtering out the charge-pump noise. comparison between directdrive output and ac-coupled output the actual level of the video signal varies less with a directdrive output than an ac-coupled output. the average video signal level can change greatly depend- ing upon the picture content. with an ac-coupled out- put, the average level will change according to the time constant formed by the series capacitor and series resistance (usually 150 ? ). for example, figure 1 shows an ac-coupled video signal alternating between a completely black screen and a completely white screen. notice the excursion of the video signal as the screen changes. with the directdrive amplifier, the black level is held at ground. the video signal is constrained between -0.3v and +0.7v. figure 2 shows the video signal from a directdrive amplifier with the same input signal as the ac-coupled system. video reconstruction filter (max9509) the max9509 includes an internal five-pole, butterworth lowpass filter to condition the video signal. the recon- struction filter smoothes the steps and reduces the spikes created whenever the dac output changes value. in the frequency domain, the steps and spikes cause images of the video signal to appear at multiples of the sampling clock frequency. the reconstruction fil- ter typically has ?db passband flatness of 8.1mhz and 46db attenuation at 27mhz. transparent sync-tip clamp the max9509/max9510 contain an integrated, trans- parent sync-tip clamp. when using a dc-coupled input, the sync-tip clamp does not affect the input sig- nal, as long as it remains above ground. when using an ac-coupled input, the transparent sync-tip clamp auto- matically clamps the input signal to ground, preventing it from going lower. a small current of 2? pulls down on the input to prevent an ac-coupled signal from drift- ing outside the input range of the part. using an ac-coupled input will result in some addition- al variation of the black level at the output. applying a voltage above ground to the input pin of the device always produces the same output voltage, regardless of whether the input is dc- or ac-coupled. however, since the sync-tip clamp level (v clp ) can vary over a small range, the video black level at the output of the device when using an ac-coupled input can vary by an additional amount equal to the v clp multiplied by the dc voltage gain (a v ). max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers _______________________________________________________________________________________ 9 input output 2ms/div figure 1. ac-coupled output input output 2ms/div 0v 0v figure 2. directdrive output
max9509/max9510 short-circuit protection the max9509/max9510 functional diagram/typical application circuit includes a 75 ? back-termination resistor that limits short-circuit current if an external short is applied to the video output. the max9509/max9510 also feature internal output short-circuit protection to prevent device damage in prototyping and applications where the amplifier output can be directly shorted. shutdown the max9509/max9510 feature a low-power shutdown mode for battery-powered/portable applications. shutdown reduces the quiescent current to less than 10na. connecting shdn to ground (gnd) disables the output and places the max9509/max9510 into a low- power shutdown mode. in shutdown mode, the sync-tip clamp, filter (max9509), amplifier, charge pump, and linear regulator are turned off and the video output is high impedance. applications information power consumption the quiescent power consumption and average power consumption of the max9509/max9510 are remarkably low because of 1.8v operation and directdrive technolo- gy. quiescent power consumption is defined when the max9509/max9510 are operating without load. in this case, the max9509/max9510 consume approximately 5.8mw. average power consumption, which is defined when the max9509/max9510 drive a 150 ? load to ground with a 50% flat field, is about 11.7mw. table 1 shows the power consumption with different video sig- nals. the supply voltage is 1.8v. out drives a 150 ? load to ground. table 1. power consumption of max9509/ max9510 with different video signals notice that the two extremes in power consumption occur with a video signal that is all black and a video signal that is all white. the power consumption with 75% color bars and 50% flat field lies in between the extremes. interfacing to video dacs that produce video signals larger than 0.25v p-p devices designed to generate 1v p-p video signals at the output of the video dac can still work with the max9509/max9510. most video dacs source current into a ground-referenced resistor, which converts the current into a voltage. figure 3 shows a video dac that creates a video signal from 0 to 1v across a 150 ? resistor. the following video filter amplifier has a gain of 2v/v so that the output is 2v p-p . the max9509/max9510 expect input signals that are 0.25v p-p nominally. the same video dac can be made to work with the max9509/max9510 by scaling down the 150 ? resistor to a 37.5 ? resistor, as shown in figure 4. the 37.5 ? resistor is 1/4 the size of the 150 ? resistor, resulting in a video signal that is 1/4 the amplitude. 1.8v, ultra-low power, directdrive video filter amplifiers 10 ______________________________________________________________________________________ video signal max9509 power consumption (mw) max9510 power consumption (mw) all black screen 6.7 6.2 all white screen 18.2 17.9 75% color bars 11.6 11.0 50% flat field 11.7 11.3 150 ? 0 to 1v lpf dac image processor asic 75 ? 2v p-p 2v/v 37.5 ? *for max9509 only. 0 to 0.25v lpf* dac image processor asic max9509 max9510 75 ? 2v p-p 8v/v figure 3. the video dac generates a 1v p-p signal across a 150 ? resistor connected to ground. figure 4. the video dac generates a 0.25v p-p signal across a 37.5 ? resistor connected to ground.
anti-alias filter the max9509 can also provide anti-alias filtering with a buffer before an adc, which would be present in a ntsc/pal video decoder, for example. figure 5 shows an example application circuit. an external composite video signal is applied to vidin, which is terminated with a total of 74 ? (56 ? and 18 ? resistors) to ground. the signal is attenuated by four, and then ac-coupled to in. the normal 1v p-p video signal must be attenuat- ed because with a 1.8v supply, the max9509 can only handle a video signal of approximately 0.25v p-p at in. ac-couple the video signal to in because the dc level of an external video signal is usually not well specified, although it is reasonable to expect that the signal is between -2v and +2v. the 10 ? series resistor increas- es the equivalent source resistance to approximately 25 ? , which is the minimum necessary for a video source to drive the internal sync-tip clamp. for external video signals larger than 1v p-p , operate the max9509 from a 2.5v supply so that in can accom- modate a 0.325v p-p video signal, which is equivalent to a 1.3v p-p video signal at vidin. max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers ______________________________________________________________________________________ 11 max9509 shutdown circuit video decoder linear regulator charge pump v dd dc-level shift 75 ? 75 ? out gnd c1p c1n v ss c1 1 f 0.1 f c2 1 f v dd vidin c3 0.1 f in v dd = 1.8v shdn clamp lpf 10 ? 18 ? 56 ? v dd a v = 8v/v figure 5. max9509 used as an anti-alias filter with buffer
max9509/max9510 video source with a positive dc bias in some applications, the video source generates a sig- nal with a positive dc voltage bias, i.e., the sync tip of the signal is well above ground. figure 6 shows an example in which the outputs of the luma (y) dac and the chroma (c) dac are connected together. since the dacs are current-mode, the output currents sum togeth- er into the resistor, which converts the resulting current into a voltage representing a composite video signal. if the chroma dac has an independent output resistor to ground, then the chroma signal, which is a carrier at 3.58mhz for ntsc or at 4.43mhz for pal, has a posi- tive dc bias to keep the signal above ground at all times. if the luma dac has an independent output resistor to ground, then the luma signal usually does not have a positive dc bias, and the sync tip is at approximately ground. when the chroma and luma sig- nals are added together, the resulting composite video signal still has a positive dc bias. therefore, the signal must be ac-coupled into the max9509/max9510 because the composite video signal is above the nomi- nal, dc-coupled input range of 0 to 0.25v. video signal routing minimize the length of the pcb trace between the out- put of the video dac and the input of the max9509/ max9510 to reduce coupling of external noise into the video signal. if possible, shield the pcb trace. 1.8v, ultra-low power, directdrive video filter amplifiers 12 ______________________________________________________________________________________ figure 6. luma (y) and chroma (c) signals are added together to create a composite video signal, which is ac-coupled into the max9509/max9510. max9509 max9510 shutdown circuit linear regulator charge pump v dd dc-level shift out gnd c1p c1n v ss c1 1 f c2 1 f v dd dac video asic c3 0.1 f in v dd = 1.8v c y shdn clamp lpf* *for max9509 only. dac 75 ? 75 ? a v = 8v/v v dd 0.1 f
power-supply bypassing and ground management the max9509/max9510 operate from a 1.7v to 2.625v single supply and require proper layout and bypassing. for the best performance, place the components as close to the device as possible. proper grounding improves performance and prevents any switching noise from coupling into the video signal. bypass the analog supply (v dd ) with a 0.1? capacitor to gnd, placed as close to the device as possible. bypass v ss with a 1? capacitor to gnd as close to the device as possible. the total system bypass capac- itance on v dd should be at least 10? or ten times the capacitance between c1p and c1n. using a digital supply the max9509/max9510 were designed to operate from noisy digital supplies. the high psrr (49db at 100khz) allows the max9509/max9510 to reject the noise from the digital power supplies (see the typical operating characteristics ). if the digital power supply is very noisy and stripes appear on the television screen, increase the supply bypass capacitance. an additional, smaller capacitor in parallel with the main bypass capacitor can reduce digital supply noise because the smaller capacitor has lower equivalent series resistance (esr) and equivalent series induc- tance (esl). max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers ______________________________________________________________________________________ 13 functional diagram/typical application circuit max9509 max9510 dc-coupled input shutdown circuit linear regulator charge pump a v = 8v/v v dd dc-level shift 75 ? 75 ? out gnd c1p c1n v ss v dd c1 1 f c2 1 f v dd video asic c3 0.1 f in v dd = 1.8v shdn transparent clamp lpf* *for max9509 only. dac
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 14 ______________________________________________________________________________________ pin configurations 134 8 ep* *ep = exposed pad. 65 out in v dd max9509 2 7 shdn v ss gnd c1p c1n tdfn top view max + + 1 2 3 4 8 7 6 5 out in v dd c1p gnd c1n v ss shdn max9510 chip information process: bicmos
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers ______________________________________________________________________________________ 15 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 .) package outline 21-0168 2 1 d 6 & 8l tdfn exposed pad, 2x2x0.80mm 8l tdfn exposed pads.eps
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 16 ______________________________________________________________________________________ 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 .) symbol common dimensions 2.10 1.90 0.80 max. 0.70 min. 0.20 ref. 0.40 0.05 2.10 0.20 0.00 1.90 d a l a1 e a2 k 1.600.10 1.30 ref [(n/2)-1] x e 0.300.05 b 0.65 typ. e package variations pkg. code 0.900.10 e2 d2 6 n t622-1 0.25 min. package outline 21-0168 2 2 d 6 & 8l tdfn exposed pad, 2x2x0.80mm 1.300.10 1.50 ref 0.250.05 0.50 typ. 0.700.10 8 t822-1 0.150 r 0.125 1.200.10 1.50 ref 0.250.05 0.50 typ. 0.800.10 8 t822-2 0.125
max9509/max9510 1.8v, ultra-low power, directdrive video filter amplifiers 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 17 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. springer 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 .) 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 revision history pages changed at rev 1: 1, 2, 7, 9, 13, 15?7

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