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? semiconductor components industries, llc, 2011 august, 2018 ? rev. 4 1 publication order number: ncs2561/d ncs2561, ncv2561 3.3v single channel video driver with recontruction filter and sag correction the ncs2561 is a single high speed video driver including a 2?pole reconstruction filter and sag corr ection capability. the ncs2561 is available in a space saving sc?88 package optimized for low voltage, portable applications. it is designed to be compatible with digital?to?analog converters (dac) embedded in most video processors. the ncs2561 internally integrates an 8 mhz 2?pole video dac reconstruction filter with a fixed gain of 2. the ncs2561 also has a built?in sag correction circuit when used at the output in an ac?coupled mode. to further reduce power consumption, an enable pin is provided. features ? internal 8 mhz 2?pole reconstruction filter ? internal fixed gain: 6 db ? integrated level shifter ? sag correction circuit for reducing coupling capacitor size ? low quiescent current: 6 ma typ ? shutdown current < 5 a ? wide input voltage range ? capability to drive 2 cvbs video signals together (2x150 loads) ? excellent video performance ? operating supply voltage range: +2.7 v to +3.3 v ? ncv prefix for automotive and other applications requiring unique site and control change requirements; aec?q100 qualified and ppap capable ? these devices are pb?free and are rohs compliant applications ? portable video, digital cameras & camera phones ? set?top box video filters ? ntsc and pal figure 1. block diagram level shifter + gnd ? enable ncs2561 vcc in out sag 5 6 4 3 2 1 2?pole filter 2.7v to 3.3v www. onsemi.com yg1 = specific device code m = date code* = pb?free package marking diagrams device package shipping ? ordering information ncs2561sqt1g sc?88 (pb?free) 3000 / tape & ree l sc?88 sq suffix case 419b enable v cc out sag gnd in 3 2 1 4 5 6 top view ? for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specification s brochure, brd8011/d. pin connections 1 yg1 m 1 6 (note: microdot may be in either location) *date code orientation and/or position may vary depending upon manufacturing location. related resource: refer to application note and8457/d for details regarding sag correction NCV2561SQT1G sc?88 (pb?free) 3000 / tape & ree l
ncs2561, ncv2561 www. onsemi.com 2 pin function and description pin name type description 1 in input video input 2 gnd ground ground 3 sag output sag compensation 4 out output video output 5 enable input enable / disable function: high = enable, low = disable. when left open the default state is high. 6 v cc power power supply / 2.7 v v cc 3.3 v attributes characteristic value esd protection (note 1) human body model machine model 2 kv 200 v latch?up current (note 2) 75 ma moisture sensitivity (note 3) level 1 flammability rating oxygen index: 28 to 34 ul 94 v?0 @ 0.125 in 1. this device series incorporates esd protection and is tested by the following methods: esd human body model tested per jedec standard js?001?2017 (aec?q100?002) esd charged device model tested per jedec standard js?002?2014 (aec?q100?011). 2. latch?up current tested per jedec standard jesd78e (aec?q100?004). 3. for additional moisture sensitivity information, refer to application note and8003/d. maximum ratings rating symbol value unit power supply voltages v cc 3.6 vdc input voltage range v i ?0.5 to v cc + 0.5 vdc output short?circuit to gnd thru 75 i sc continuous ? maximum junction temperature (note 4) t j 150 c operating ambient temperature ncs2561 ncv2561 (note 5) t a ?40 to +125 ?40 to +125 c storage temperature range t stg ?60 to +150 c thermal resistance, junction?to?air r ja 250 c/w stresses exceeding those listed in the maximum ratings table may damage the device. if any of these limits are exceeded, device function ality should not be assumed, damage may occur and reliability may be affected. 4. power dissipation must be considered to ensure maximum junction temperature (t j ) is not exceeded. 5. ncv prefix is for automotive and other applications requiring site and change control. maximum power dissipation the maximum power that can be safely dissipated is limited by the associated rise in junction temperature. for the plastic packages, the maximum safe junction temperature is 150 c. if the maximum is exceeded momentarily, proper circuit operation will be restored as soon as the die temperature is reduced. leaving the device in the ?overheated? condition for an extended period can result in device burnout. to ensure proper operation, it is important to observe the de?rating curves.
ncs2561, ncv2561 www. onsemi.com 3 dc electrical characteristics with v cc = 2.7 v to 3.3 v (t a = +25 c, r l = 150 to gnd, unless otherwise specified) symbol characteristic conditions min typ max unit dc performance v ols offset level?shift output voltage t a = ?40 c to +125 c (note 6) v cc = 3.3 v, v in = 0 v 10 60 60 80 mv i ib input bias current 3 pa v in input voltage range (note 7) v cc = 3.3 v gnd v cc ? 1.5 v a v voltage gain v cc = 3.3 v, 0 < v in < 1.5 v 40 ire sync, 100 ire white level 5.8 6.0 6.2 db v ih enable input high level voltage 1.6 v cc v v il enable input low level voltage gnd 0.8 v output characteristics v oh output high level voltage r l = 150 to gnd r l = 75 to gnd v cc ? 0.3 v cc ? 0.1 v cc ? 0.3 v v ol output low level voltage (note 8) 60 mv i o output current v cc = 3.3 v 50 ma power supply v cc operating voltage range 2.7 3.3 v i cc, on power supply current ? enabled t a = ?40 c to +125 c (note 6) v in = 0 v, v cc = 3.3 v, i o = 0 ma 6.0 7.5 9.0 ma i cc, off power supply current ? disabled v in = 0 v, v cc = 3.3 v, i o = 0 ma 1.5 5.0 a psrr power supply rejection ratio v cc = 2.7 v to 3.3 v 80 v/v 6. guaranteed by design and/or characterization. 7. limited by output swing and internal gain. 8. output low voltage level is limited by the internal level shift circuitry. ac electrical characteristics with v cc = 2.7 v to 3.3 v (t a = +25 c, r l = 150 to gnd, unless otherwise specified) symbol characteristic conditions min typ max unit frequency domain performance an normalized passband gain (note 9) v cc =3.3 v, f=1.0 mhz , v o =2 v p?p v cc =3.3 v, f=4.5 mhz , v o =2 v p?p f = 27 mhz, v o = 2 v p?p ?0.4 ?0.2 ?18 0 +0.4 ?22 +0.4 +0.8 db dg differential gain v cc = 3.3 v, a v = +2, r l = 150 f = 3.58 mhz, 4.43 mhz 0.5 % dp differential phase v cc = 3.3 v, a v = +2, r l = 150 , f = 3.58 mhz, 4.43 mhz 1.0 snr signal to noise ratio v cc = 3.3 v, 100% white signal 70 db time domain response t g group delay variation v cc = 3.3 v, 100 khz to 5.0 mhz 15 ns t on turn on time 1.5 s t off turn off time 50 ns 9. the normalized gain is guaranteed by design and characterization. the max normalized gain of +0.8 db is the result of smooth peaking (pre?emphasis, see figure 2) taking into account the increase of the losses at the highest frequencies into connectors and cable at the output . for frequencies lower than 2 mhz the max normalized gain is 0.4 db.
ncs2561, ncv2561 www. onsemi.com 4 typical characteristics (at t a = +25 c and r l = 150 , unless otherwise specified) figure 2. frequency response figure 3. group delay vs. frequency figure 4. differential gain figure 5. differential phase figure 6. psrr vs. frequency figure 7. quiescent current vs. supply voltage
ncs2561, ncv2561 www. onsemi.com 5 figure 8. quiescent current vs. temperature (v cc = 3.0 v) figure 9. signal?to?noise ratio vs. temperature
ncs2561, ncv2561 www. onsemi.com 6 applications information the ncs2561 is a single video driver optimized for portable applications with low power consumption in a space saving sc?88 package. it includes sag correction circuitry allowing significant reduction of the ac?coupled output capacitor. internal level shift the input common mode voltage range (see specifications v in ) of the ncs2561 includes the lower rail (gnd) and extends to v cc ? 1.5v on a power supply range of 2.7 v to 3.3 v. many video processors operate with a supply ranging from 0 v to a positive supply (typically 3.3 v), so the lowest voltage of the video signal provided by the dac is 0 v. although a 0 v (gnd) signal is within the input common?mode range of the ncs2561, the output signal will be limited, specifically at the lower rail. op amps use transistors with saturation voltage (vsat) higher than 0 v. if the lowest level of the input voltage is lower than vsat the signal will be clipped at the output. to ensure the output signal is not clipped due to the lower rail limit, the ncs2561 has built?in level shift circuitry. the role of this circuitry is to avoid clipping of the sync signal at the output by shifting up the video signal by about 60 mv. the level shift circuitry level shifts the sync signal above the internal op amp transistor saturation limit. this function is particularly useful when the video signal is dc?c oupled at the output. built?in 2?pole reconstruction filter the ncs2561 has a 2?pole reconstruction filter with a ?3 db cut?off frequency at 8 mhz. the filter serves as an anti?alias filter removing the unwanted over?sampling effects produced by the video dac. the 27 mhz over?sampling frequency from the video dac is attenuated by 22 db typical. in order to improve the stop?band attenuation a small capacitor (cs) of a few tenths pico farads can be added in parallel with the source resistor (rs) (see figure 10). gnd enable ncs2561 out sag + cs: optional figure 10. block diagram showing filter and sag correction circuits video dac in 47 f / 67 f 22 f 75 75 325 528 650 ? v cc 2.7v to 3.3v tv 845 12 pf 1.4 k 1.1 k 10 pf cs rs 1 v 0 v 1 vpp shutdown mode if the enable pin is left open by default the circuit will be enabled. the enable pin offers a shutdown function, so the ncs2561 can consequently be disabled when not used. this is particularly important for digital still cameras or cell phones with camera having a video output feature. indeed this video output is not permanently used and actually used in very specific period of time when pictures or small movies want to be displayed on a bigger screen. the device?s quiescent current drops typically down to 2.7 a when the device is in the shutdown mode.
ncs2561, ncv2561 www. onsemi.com 7 sag correction video drivers that do not incorporate sag compensation traditionally recommend a large coupling capacitor (220 f) on the output of the video driver. larger output coupling capacitors ( 470 f) are often chosen by design engineers when the application allows this (set?top box). a larger output coupling capacitor allows a lower cut?off frequency to avoid field tilt effects; however in portable applications there is a trade?off between large and expensive coupling capacitors, and a coupling configuration to saving space. the sag compensation circuitry allows the reduction of this output coupling capacitor value by inducing peaking at the lower cutoff frequency of the high pass filter. the high?pass filter is created by the coupling capacitor and the load resistor (1/(2 r l cout), and this peaking lowers the cutoff frequency. simulation results provided in figure 11 show the effect of the sag compensation at the low cut?off frequency. gain vs frequency ?30 ?25 ?20 ?15 ?10 ?5 0 5 10 15 20 1 10 100 1000 10000 100000 1000000 10000000 1e+08 frequency (hz) gain (db) cout = 22uf cout = 47uf cout = 67uf cout = 100uf cout = 220uf figure 11. simulation results with csag = 22 f and variable cout calculations show that a 220 f output capacitor produces a low cutoff frequency of 5 hz, and a 470 f capacitor will give a low cutoff frequency at 2.6 hz. the cutoff frequency (?3 db) is defined by the equation: 1/(2 r l cout). in the case where no sag is used (figure 14), a low cout value can adversely affect the low cutoff frequency; the cut?off frequency will be in the critical 50 hz or 60 hz frequencies. this undesirable affect will manifest itself as field tilt. due to the sag correction the lar ge output capacitor is reduced without degrading the video performances by the use of two smaller and cheaper output capacitors. figure 12. sag correction configuration 1 v 0 v 1 vpp level shifter + gnd ? enable ncs2561 vcc in 2?pole filter 2.7v to 3.3v out sag video dac 47 f / 67 f 22 f 75 75 tv rs enable vcc
ncs2561, ncv2561 www. onsemi.com 8 the csag value has no significant impact on the coupling even as the value increases. a value of 22 f is recommended for optimal performance. to achieve similar behavior to an output coupling capacitor value cout = 220 f (no sag) the nominal equivalent sag combination is csag = 22 f and cout = 67 f. a value of 47 f for cout will yield equivalent results. if we consider a coupling cap of 470 f, the best compromise for sag combination is csag = 22 f and cout = 100 f. a value of 67 f for cout will yield equivalent results. figures 13 and 14 show the impact of the output coupling capacitor on a video signal corresponding to a worst case situation regarding the low frequency bandwidth. the video signal used is a 50 hz 1/2 black ? 1/2 white video pattern. this signal is obtained using the pal flat field square wave signal option available with the video generator tg700 from tektronix. these measurements show how the sag function can help to reduce the field tilt problem using lower value coupling capacitor than traditional approach. figure 13. no sag, cout = 220 f (top : input, bottom : output) figure 14. csag = 22 f, cout = 47 f (top : input, bottom : output) figure 15. ncs2561 in an ac?coupled configuration with no sag 1 v 0 v 1 vpp level shifter + gnd ? enable ncs2561 vcc in 2?pole filter 2.7v to 3.3v out sag video dac 220 f / 470 f 75 75 tv rs enable vcc
ncs2561, ncv2561 www. onsemi.com 9 dc?coupled output having efficient output ac?coupled capability thanks to the sag correction option, with the built?in level shifter, the ncs2561 can also be dc?coupled to a 150 load. this has the advantage of eliminating the ac?coupling capacitors at the output by reducing the number of external components and saving space on the board. this can be a key advantage for some portable applications with limited space. the problems of field tilt effects on the video signal are also eliminated providing the best video quality with optimal dynamic or peak?to?peak amplitude of the video signal allowing operating at the lower power supply voltage (2.7 v) without risk of signal clipping. in this coupling configuration the average output voltage is higher than 0 v and the power consumption can be a little higher than with an ac?coupled configuration. figure 16. dc?coupled input and output configuration 1 v 0 v 1 vpp level shifter + gnd ? enable ncs2561 vcc in 2?pole filter 2.7v to 3.3v out sag video dac 75 75 tv rs enable vcc video driving capability with an output current capability of 50 ma the nsc2561 was designed to be able to drive at least 2 video display loads in parallel (2 different display or 1 display + 1 vcr). this applications is illustrated in the figure 17. figure 18 (multiburst) and figure 19 (linearity) show that the video signal can efficiently drive a 75 equivalent load and not degrade the video performance. figure 17. ncs2561 driving 2 video display (two 150 loads) 1 v 0 v 1 vpp level shifter + gnd ? enable ncs2561 vcc in 2?pole filter 2.7v to 3.3v out sag video dac 47 f / 67 f 22 f 75 75 tv rs enable vcc 75 75 other vide o display
ncs2561, ncv2561 www. onsemi.com 10 figure 18. multiburst test with two 150 loads figure 19. linearity test with two 150 loads esd protection all the device pins are protected against electrostatic discharge at a level of 2 kv hbm. the output has been considered with a particular attention with esd structure able to sustain typically more than 2 kv hbm. actually more than 4 kv has been measured on this specific output pin. this feature is particularly important for video driver which usually constitutes the last stage in the video chain before the video output connector.
ncs2561, ncv2561 www. onsemi.com 11 package dimensions sc?88/sc70?6/sot?363 case 419b?02 issue y notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: millimeters. 3. dimensions d and e1 do not include mold flash, protrusions, or gate burrs. mold flash, protru- sions, or gate burrs shall not exceed 0.20 per end. 4. dimensions d and e1 at the outermost extremes of the plastic body and datum h. 5. datums a and b are determined at datum h. 6. dimensions b and c apply to the flat section of the lead between 0.08 and 0.15 from the tip. 7. dimension b does not include dambar protrusion. allowable dambar protrusion shall be 0.08 total in excess of dimension b at maximum material condi- tion. the dambar cannot be located on the lower radius of the foot. c ddd m 123 a1 a c 654 e b 6x dim min nom max millimeters a ??? ??? 1.10 a1 0.00 ??? 0.10 ddd b 0.15 0.20 0.25 c 0.08 0.15 0.22 d 1.80 2.00 2.20 ??? ??? 0.043 0.000 ??? 0.004 0.006 0.008 0.010 0.003 0.006 0.009 0.070 0.078 0.086 min nom max inches 0.10 0.004 e1 1.15 1.25 1.35 e 0.65 bsc l 0.26 0.36 0.46 2.00 2.10 2.20 0.045 0.049 0.053 0.026 bsc 0.010 0.014 0.018 0.078 0.082 0.086 *for additional information on our pb?free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint* 0.65 0.66 6x dimensions: millimeters 0.30 pitch 2.50 6x recommended top view side view end view bbb h b seating plane detail a e a2 0.70 0.90 1.00 0.027 0.035 0.039 l2 0.15 bsc 0.006 bsc aaa 0.15 0.006 bbb 0.30 0.012 ccc 0.10 0.004 a-b d aaa c 2x 3 tips d e1 d e a 2x aaa h d 2x d l plane detail a h gage l2 c ccc c a2 6x ncs2561/d on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent?marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. p ublication ordering information n. american technical support : 800?282?9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303?675?2175 or 800?344?3860 toll free usa/canada fax : 303?675?2176 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loc al sales representative ?

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