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SGM9121 8mhz, 5th-order video driver with 6db gain product description the SGM9121 is a single rail-to-rail 5th-order output reconstruction filter with a -3db bandwidth of 8mhz and 34.8v/s slew rate. operating from single power supply ranging from 3.0v to 5.5v and sinking an ultra-low 7ma quiescent current, the SGM9121 is ideally suited for low power, battery-operated applications. SGM9121 employs an internal level shift circuit that avoids sync-pulse clipping and allows dc-coupled output. if ac coupling is preferred, the SGM9121 offers a sag-correction feature that significantly reduces the size of the output coupling capacitor. SGM9121 has a power-down disable feature that reduces the supply current to 0.72 a, dramatically reducing power consumption and prolonging battery life. it is specified over the extended -40c to +85c temperature range. block diagram out sag 5th-order filter SGM9121 6db level shifter in v cc gnd v cc = 3.0v to 5.5v disable 10k to external power supply or control i/o features ? excellent video performance ? 5th-order reconstruction filter ? internal gain: 6db ? rail-to-rail output ? sag correction reduces ac coupling capacitor size ? input voltage range includes ground ? ac-coupled input ? single power supply: 3.0v to 5.5v ? low power 7ma typical supply current 0.72 a supply current when disabled ? available in green sc70-6 package applications video amplifiers cable and satellite set-top boxes communication devices video on demand portable and handheld products personal video recorders dvd players hdtv notes: 1. a 10k ? resistor must be serially connected to disable pin. 2. power supply v cc must be sequenced on first before input video signals. rev. a. 3 sg micro corp www.sg-micro.com
8mhz, 5th-order video driver with 6db gain 2 SGM9121 sg micro corp www.sg-micro.com package/ordering information order number package description temperature range package option marking information SGM9121yc6g/tr sc70-6 -40 to +85 tape and reel, 3000 s0axx note: order number and package mark ing are defined as the follow: order number SGM9121 x x g / tr package type tape and reel c6 sc70-6 operating temperature range y -40 to +85 green product marking information for example: s0a9a (2009, january) s0a x x date code - year ("9" = 2009, "a" = 2010 ) date code - month ("a" = jan. "b" = feb. "l" = dec.) chip i.d. absolute maximum ratings supply voltage, v cc to gnd...................................................6v input voltage..... .............. ................... g nd - 0.3v to v cc + 0.3v storage temperature range..............................-65 to +150 junction temperature ...................................................... 150 operating temperature range .................. ......... -40 to +85 lead temperature range (solderi ng 10 sec)................... 260 esd susceptibility hbm.................... ..................... ...................... .................. 8000v mm......................................................................................400v note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the s pecifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. caution this integrated circuit can be damaged by esd if you don?t pay attention to esd protection. sgmicro recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. sgmicro reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. please contact sgmicro sales office to get the latest datasheet.
8mhz, 5th-order video driver with 6db gain 3 sg micro corp www.sg-micro.com SGM9121 pin configuration (top view) in 3 4 5 6 1 2 gnd sag v cc disable out s0axx sc70-6 pin description pin name function 1 in signal input. 2 gnd ground. 3 sag sag correction. 4 out signal output. 5 disable shutdown input. 6 v cc power supply.
8mhz, 5th-order video driver with 6db gain 4 sg micro corp www.sg-micro.com SGM9121 electrical characteristics: v cc = 5.0v (at r l = 150 ? connected to gnd, v in = 1v pp and c in = 0.1 f, all outputs ac-coupled, referenc ed to 400khz, unless otherwise noted.) parameter conditions temp min typ max units input characteristics +25c 344 480 output level shift voltage (v ols ) v in = 0v, no load -40c to +85c 587 mv +25c -180 -111 input voltage clamp (v clamp ) i in = - 3.5ma -40c to +85c -269 mv +25c -6.0 -4.8 clamp charge current v in = v clamp - 100mv -40c to +85c -6.4 ma +25c 1.9 3 clamp discharge current v in = 500mv -40c to +85c 7 a +25c 5.6 6 6.4 voltage gain (a v ) r l = 150 ? -40c to +85c 5.5 6.5 db output characteristics +25c 4.60 4.79 output voltage high swing v in = 3.0v, r l = 150 ? to gnd -40c to +85c 4.57 v +25c 90 122 v in = 0.5v, out shorted to gnd through 10 ? -40c to +85c 80 ma +25c -131 -100 output short-circuit current (i sc ) v in = 1.5v, out shorted to v cc through 10 ? -40c to +85c -89 ma power supply operating voltage range (v cc ) +25c 3.0 5.5 v +25c 45 52 power supply rejection ratio (psrr) v cc = 3.5v to 5.0v -40c to +85c 44 db +25c 7.0 9.5 quiescent current (i q ) v in = 0.5v, disable = v cc , r l = 0 -40c to +85c 11 ma +25c 0.72 10 supply current when disabled disable = 0v -40c to +85c 13 a dynamic performance -0.1db bandwidth +25c 5.56 mhz -3db bandwidth +25c 7.76 mhz filter response (normalized gain) f in = 27mhz +25c 42.4 db slew rate 2v output step, 80% to 20% +25c 34.8 v/s pal dc-coupled +25c 0.53 % differential gain error (dg) pal ac-coupled +25c 0.27 % pal dc-coupled +25c 1.30 differential phase error (dp) pal ac-coupled +25c 1.09 group delay variation (d/dt) difference between 400khz and 6.5mhz +25c 30.3 ns fall time 2v output step, 80% to 20% +25c 34.5 ns rise time 2v output step, 80% to 20% +25c 35.7 ns power-down disable disable (logic-low threshold) v cc = 5v +25c 0.4 v disable (logic-high threshold) v cc = 5v +25c 1.2 v
8mhz, 5th-order video driver with 6db gain 5 sg micro corp www.sg-micro.com SGM9121 typical performance characteristics at v cc = 5v, t a = +25 , r l = 150 ? , all outputs ac-coupled, unless otherwise noted. frequency response -15 -12 -9 -6 -3 0 3 0.1 1 10 100 frequency (mhz) normalized gain (db) large signal step response -0.75 -0.5 -0.25 0 0.25 0.5 0.75 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 time ( s) output voltage (v) group delay vs. frequency -100 -50 0 50 100 0.1 1 10 100 frequency (mhz) group delay (ns) phase vs. frequency -270 -180 -90 0 90 180 270 0.1 1 10 100 frequency (mhz) phase (degree) small signal step response -0.3 -0.2 -0.1 0 0.1 0.2 0.3 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 time ( s) output voltage (v) quiescent current vs. supply voltage 4 5 6 7 8 33.544.555.5 supply voltage (v) quiescent current (ma)
8mhz, 5th-order video driver with 6db gain 6 sg micro corp www.sg-micro.com SGM9121 typical performance characteristics at v cc = 5v, t a = +25 , r l = 150 ? , all outputs ac-coupled, unless otherwise noted. quiescent current vs. temperature 4 5 6 7 8 9 10 -40 -15 10 35 60 85 temperature ( ) quiescent current (ma ) output voltage swing to the positive rail vs. output current 3.5 3.75 4 4.25 4.5 4.75 5 0 20 406080100 output current (ma) output voltage (v) + 85 -4 0 +25 gain error vs. temperature 0 0.2 0.4 0.6 0.8 1 1.2 -40 -15 10 35 60 85 temperature ( ) gain error (%) output voltage swi ng to the negative rai l vs. ou tp ut cu rren t 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 20406080100 output current (ma) output voltage (v) +85
8mhz, 5th-order video driver with 6db gain 7 sg micro corp www.sg-micro.com SGM9121 application information the SGM9121 low cost, integrated, 5th-order video filter is intended to replace passive lc filters and drivers in low voltage portable video applications. the SGM9121 input must be ac-coupled because the input capacitor stores the clamp voltage. it needs a typical value of 0.1f for the input clamp to meet the line droop specification. the SGM9121 output can drive an ac- or dc-coupled doubly terminated coax (150 ? ) load (see figure 1). dc coupling the output removes the need for an expensive and large output coupling capacitor (see figure 2). if an ac-coupled output is needed, the sag correction circuit can be used to reduce the ac output coupling capacitor value. offering sag correction, fixed gain of 6db, and a 5th- order low pass filter in a tiny space saving package makes the SGM9121 well suited for space sensitive applications such as digital cameras, cellular phones and other portable devices. enable/shutdown the SGM9121 has a shutdown feature that disables the output and reduces the quiescent current to 0.72 a. this feature is particularly useful in portable applications, such as video cameras, hand held gaming devices and cellular phones, where video filtering and driving capability are required. internal sync clamp the typical embedded video dac operates from a ground referenced single supply. this becomes an issue because the lower level of the sync pulse output may be at a 0v reference level to some positive level. the problem is that presenting a 0v input to most single supply driven amplifiers will sa turate the output stage of the amplifier, resulting in a clipped sync tip and degrading the video image. a larger positive reference may offset the input above its positive range. the SGM9121 features an internal sync clamp and offset function to level shift the entire video signal to the best level before it reaches the in put of the amplifier stage. these features are also helpful to avoid saturation of the output stage of the amplifier by setting the signal closer to the optimal voltage range. the typical application diagram of the SGM9121 in figure 1 is divided into four sections. the first, section a is the sync clamp. the ac-coupled video sync signal is pulled negative by a current source at the input of the comparator amplifier. when the sync tip goes below the comparator threshold, the comparator output is driven negative, and the pmos device turns on, clamping sync tip to near ground level. the network triggers on the sync tip of video signal. out sag SGM9121 5th-order filter 6db level shifter in v cc gnd v cc = 3.0v to 5.5v r in c in 0.1 f disable 22f 47f r out c out c s r l 75 75 10k to external power supply or control i/o figure 1. ac-coupled input/ac-coupled output
8mhz, 5th-order video driver with 6db gain 8 sg micro corp www.sg-micro.com SGM9121 application information out sag SGM9121 5th-order filter 6db level shifter in v cc gnd v cc = 3.0v to 5.5v r in c in 0.1 f disable r out r l 75 75 10k to external power supply or control i/o figure 2. ac-coupled input/dc-coupled output sag correction the SGM9121 can use the sag configuration if an ac-coupled output video signal is needed. sag correction refers to the low-frequency compensation for the high pass filter formed by the 150 ? load and the output capacitor. in video applications, 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 220f. in sag configuration, the SGM9121 removes the need for large coupling capacitors, and instead only requires one 22f and one 47f capacitors (figure 1) to achieve the same performance as the large capacitor. the sallen key low pass filter the sallen key in a classic low pass configuration is illustrated in figure 1. the filter provides a very stable low pass function, and in the case of the SGM9121, a 5th-order roll-off at around 8mhz. the 5th-order function is accomplished with an rc low pass network placed in series with and before the sallen key. one pole provided by the rc network and poles two and three provided by the sallen key produce a nice 5th-order roll-off at around 8mhz. layout and power-supply bypassing the SGM9121 operates from single 3.0v to 5.5v supply. bypass the supply with a 0.1f capacitor as close to the pin as possible. it is recommended to use microstrip and stripline techniques to obtain full bandwidth. to ensure that the pc board does not degrade the device?s 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 ic sockets; they increase parasitic capacitance and inductance. do not use wire-wrap boards; they are too inductive. use surface-mount instead of through-hole components 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.
8mhz, 5th-order video driver with 6db gain 9 sg micro corp www.sg-micro.com SGM9121 package outline dimensions sc70-6 e e1 e1 e d b a a2 a1 l c 0.20 l1 0.65 0.75 1.3 0.4 1.9 recommended land pattern (unit: mm) dimensions in millimeters dimensions in inches symbol min max min max a 0.900 1.100 0.035 0.043 a1 0.000 0.100 0.000 0.004 a2 0.900 1.000 0.035 0.039 b 0.150 0.350 0.006 0.014 c 0.080 0.150 0.003 0.006 d 2.000 2.200 0.079 0.087 e 1.150 1.350 0.045 0.053 e1 2.150 2.450 0.085 0.096 e 0.65 typ 0.026 typ e1 1.300 bsc 0.051 bsc l 0.525 ref 0.021 ref l1 0.260 0.460 0.010 0.018 0 8 0 8
8mhz, 5th-order video driver with 6db gain 10 sg micro corp www.sg-micro.com SGM9121 tape and reel information note: the picture is only for reference. please make the object as the standard. key parameter list of tape and reel package type reel diameter reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p0 (mm) p1 (mm) p2 (mm) w (mm) pin1 quadrant sc70-6 7 9.5 2.4 2.5 1.2 4.0 4.0 2.0 8.0 q3 reel width (w1) reel diameter reel dimensions tape dimensions direction of feed p2 p0 w p1 a0 k0 b0 q1 q2 q4 q3 q3 q4 q2 q1 q3 q4 q2 q1
8mhz, 5th-order video driver with 6db gain 11 sg micro corp www.sg-micro.com SGM9121 carton box dimensions note: the picture is only for reference. please make the object as the standard. key parameter list of carton box reel type length (mm) width (mm) height (mm) pizza/carton 7 (option) 368 227 224 8 7 442 410 224 18

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