general description the max9502g dual-package evaluation kit (ev kit) is aconvenient platform for evaluating the performance of the max9502g or max9502m video filter amplifiers in both ?fn and sc70 packages. the input and output (i/o) signals from the max9502g dual-package ev kit are dc-coupled. the max9502g dual-package ev kit? input terminal has a 75 termination to ground, and the output has a 75 back-termination resistor. the max9502g has a gain of 2v/v (+6db) and themax9502m has a gain of 4v/v (+12db). the max9502g dual-package ev kit operates from a single 2.5v to 3.6v power supply. the max9502g/max9502m is a small, low-power, video filter amplifier that operates from a supply voltage as low as 2.5v. the filter passband is set for standard definition video. the small size and low minimum sup- ply voltage make the max9502g/max9502m ideal for portable applications such as mobile phones, digital still cameras, and camcorders. the max9502g/max9502m does not require coupling capacitors or bias networks, resulting in an extremely small footprint solution. the max9502g/max9502m input can be directly connected to the output of a video digital-to-analog converter (dac). the reconstruction filter is implemented as a 4th-order chebyshev and has + 1db passband flatness to 5.5mhz, 3db attenuation at 8mhz, and 55db attenuation at 27mhz.the output amplifier drives a 2v p-p video signal into a 150 load to ground. the output signal is level-shifted so the sync tip is typically 110mv above ground.the max9502g/max9502m consumes only 5.3ma qui- escent supply current. an active-low shutdown mode reduces the supply current to 10na. the max9502g dual-package ev kit is available in tiny 6-pin ?fn (1mm x 1.5mm x 0.72mm) and 5-pin sc70 (2mm x 2.2mm x 0.95mm) packages. the device is specified over the -40? to +85? extended temperature range and -40? to +125? automotive temperature range. the max9502g dual-package ev kit can also be used to evaluate the max9502m by replacing the ic. features ? tiny 5-pin sc70 and 6-pin dfn packages ? dc-coupled i/o saves board space ? 4-pole chebyshev filter ? 5.5mhz passband ? 55db attenuation at 27mhz ? 10na low-current shutdown mode ? 2.5v to 3.6v single-supply operation ? preset gains: +6db (max9502g),+12db (max9502m) ? evaluates the max9502m (ic replacementrequired) ? fully assembled and tested evaluates: max9502g/max9502m max9502g dual-package evaluation kit ________________________________________________________________ maxim integrated products 1 19-0694; rev 1; 10/07 component list for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642,or visit maxim? website at www.maxim-ic.com. ordering information component supplier designation qty description c1, c3 2 0.1? ?0%, 6.3v x7r ceramiccapacitors (0603) tdk c1608x7r1e104k c2, c4 0 not installed, capacitor (0.01? to1?, depending on application requirements) c5 1 10? ?0%, 6.3v x5r ceramiccapacitor (0805) tdk c2012x5r0j106m j1, j2 2 bnc connectors, vertical, pcba j3, j4 2 wire loops ju1?u4 4 3-pin headers r1?4 4 75 ?% resistors (r603) u1 1 max9502gelt+t (6-pin ?fn) u2 1 max9502gexk+t (5-pin sc70) ? pcb: max9502g dual packageevaluation kit su ppl ier ph on ef a x websit e td k c or p . 847- 803- 6100 w ww .com ponent.td k.com part type MAX9502GEVKIT ev kit note: indicate that you are using the max9502g when contacting this component supplier. downloaded from: http:///
evaluates: max9502g/max9502m max9502g dual-package evaluation kit 2 _______________________________________________________________________________________ figure 1. 100 ire multiburst signal?ync tip at ground quick start recommended equipment 2.5v to 3.6v, 500ma dc power supply for vcc video signal generator (cvbs) video measurement equipment (e.g., tektronix vm700t) two bnc/bnc 75 cables the max9502g dual-package ev kit is fully assembledand tested. follow these steps to verify board opera- tion. do not turn on the power supply until all con- nections are completed. 1) to test u1 (?fn package), place a shunt across pins 1-2 of jumper ju2, pins 1-2 of jumper ju1, and pins 1-2 of jumper ju4. to test u2 (sc70 package),place a shunt across pins 1-2 of jumper ju3, pins 2-3 of jumper ju1, and pins 2-3 of jumper ju4. ju2 sets the shdn pin high to enable the ?fn part, and ju3 sets the shdn pin high to enable the sc70 part. ju1 applies the input signal to therespective part, and ju4 selects the respective out- put signal (see tables 1 and 2). 2) connect the output of the video signal generator to the bnc in connector (j1) using one of the bnccables. note the video signal generator should be biased so that the sync tip is at ground, not below ground. downloaded from: http:///
evaluates: max9502g/max9502m max9502g dual-package evaluation kit _______________________________________________________________________________________ 3 figure 2. 100 ire multiburst signal?ync tip below ground 3) connect the bnc out connector (j2) to the tv monitor. 4) set the power supplies to 3v and then turn off power. 5) connect the negative terminal of the power supply to the gnd loop (j4) on the max9502g dual-packageev kit. 6) connect the positive terminal to the v cc pad (j3) on the max9502g dual-package ev kit. 7) turn on the power supply. 8) turn on the video signal generator and the vm700t. detailed description the max9502g dual-package ev kit is a fully assem-bled and tested surface-mount printed-circuit board (pcb) that contains a max9502gelt+t (?fn pack- age) and a max9502gexk+t (sc70 package). the max9502g/max9502m is a complete solution to inter- face a video dac to a tv monitor. the max9502g dual-package ev kit is self-contained, requiring only a 3v external power supply. the max9502g/max9502m drive a long video cable without loss of quality. the max9502g dual-package ev kit provides a shutdown pin that reduces current consumption to a minimum for power-saving features. two jumpers (ju1 and ju4) at the bnc in and bnc out connectors allow switching between the different packages. downloaded from: http:///
4 ______________________________________________________________________________________ evaluates: max9502g/max9502m jumper ju2 controls the shutdown pin ( shdn ) of the max9502gelt ic, and jumper ju3 controls the shut-down pin ( shdn ) of the max9502gexk ic. the ics are also controlled by an external logic signal connected tothe jumpers. remove the shunt from the jumper before connecting the external logic signal. connect the logic signal to the center pin of the jumper (pin 2) and the logic signal return pin to gnd (pin 3). when the logic signal is low, the max9502g/max9502m shuts down. when the logic signal is high, the max9502g/ max9502m is in normal operation. refer to the max9502 data sheet for additional information. the max9502g/max9502m feature an internal recon- struction filter that has 3db attenuation at 8mhz, 55db attenuation at 27mhz, and ?db passband flatness to 5.5mhz. the max9502g has +6db gain, while the max9502m has +12db gain. the max9502g dual- package ev kit? video input and output signals are dc-coupled, eliminating large dc-blocking capacitors. the ev kit? input terminal has a 75 termination to ground, and the output has a 75 back-termination resistor.the max9502g dual-package ev kit also evaluates the max9502m by replacing the ic. see evaluating the max9502m section for additional information. cvbs signal source the input video signal to the max9502g must beapproximately within the range of 0 to 1v for the max9502g and 0 to 0.6v for the max9502m, as the max9502g/max9502m were designed to interface to video dacs, which output a video signal in those ranges. if the video signal source used to evaluate the max9502g creates a signal with the sync pulse below ground, then the signal must be level-shifted up, such that the sync tip is at ground. note in the two cvbs waveforms shown in figures 1 and 2 that one is correctly level-shifted and the other is not. figure 1 shows the correct input signal for the max9502g ic, typically from a video dac. marker 1 in the photograph indicates ground and the cursors indi- cate a 1v p-p signal. figure 2 shows the incorrect input signal for the max9502g ic, as the signal swingsbelow ground. marker 1 in the photograph indicates ground and the cursors indicate a 1v p-p signal. level-shift circuit the level-shift circuit, as shown in figure 3, changesthe dc bias of a video signal. if the video source can- not supply a video signal with the sync tip at ground, the following circuit level-shifts the video signal. simply apply the video signal to j1 and adjust r10 so that the sync tip waveform at j2 is at ground. evaluating the max9502m to evaluate the max9502m 6-pin ?fn package,replace u1 with a max9502melt+t. to evaluate the max9502m 5-pin sc70 package, replace u2 with a max9502mexk+t. the max9502m has identical pinout and internal fea- tures as the max9502g, except the amplifier gain is +12db. refer to the max9502 data sheet for additional information. ju1/ju4 jumper selection?/o signals jumpers ju1 and ju4 control the i/o signal selection.only one max9502g/max9502m ic can be tested at a time. see table 1 for shunt positions. ju2/ju3 jumper selection?hutdown mode ( shdn ) jumpers ju2 and ju3 control the shutdown mode( shdn ) of the max9502g/max9502m ics. in the shut- down mode, the quiescent current of the ic is typically10na. see table 2 for shunt positions. max9502g dual-package evaluation kit table 2. ju2/ju3 jumper selection shunt position shdn pin function 1-2* logic level high (+3vdc) device enabled 2-3 logic level low (0vdc) device disabled (low-power mode) logic controller connected to center pin (2) and gnd (3) logic level high device enabled logic controller connected to center pin (2) and gnd (3) logic level low device disabled table 1. ju1/ju4 jumper selection jumper shunt position function ju1 1-2* input signal applied to u1 (?fn) ju1 2-3 input signal applied to u2 (sc70) ju4 1-2* o utp ut si g nal sour ced fr om u 1 ( ? fn ) ju4 2-3 output signal sourced from u2 (sc70) *default position. *default position. downloaded from: http:///
evaluates: max9502g/max9502m max4381eub max-10 u1a 3 2 2 1 5 4 10 en vee- vcc+ r2 300 1% 2 1 1 r3 300 1% r1100 1% analog analog analog video in j1bnc vertical pcb +5vdc -5vdc +5vdc 21 r9 75 1% analog video outwith offeset j2bnc vertical pcb -5vdc +5vdc analog max4381eub max-10 u1b 7 8 2 1 6 4 10 en vee- vcc+ r4 150 1% 2 1 12 12 1 2 3 12 r5 75 1% r7 10k 1% r10 50k 1% r6 10k 1% c51 f 2 1 12 9 r8 300 1% c1 10 f +5vdc -5vdc +5vdc 12 c2 10 f 12 c4 10 f 12 c3 10 f +5vdc -5vdc 4532 analog 1 4 5 3 2 analog 1 figure 3. max9502g dual-package ev kit offset circuit using the max4381 max9502g dual-package evaluation kit _______________________________________________________________________________________ 5 downloaded from: http:///
evaluates: max9502g/max9502m max9502g dual-package evaluation kit 6 _______________________________________________________________________________________ j2 ju4 r2 75 1% c1 0.1 f r4 75 1% 1 12 5 +3v 2 2 1 12 2 12 3 4 4 5 32 analog analog analog analog ju2 12 3 1 j1 ju1 1 2 3 4 5 3 2 analog max9502gelt+t ( dfn-6) v cc gnd u1 analog 6 3 1 out shdnin n.c. +3v c2dns 12 analog +3v c510 f 1 11 j3j4 2 analog c3 0.1 f 12 5 +3v 2 4 analog analog ju3 12 3 max9502gexk+t (sc70-5) v cc gnd u2 analog 3 1 out shdnin +3v c4dns r1 75 1% 12 analog 12 analog r3 75 1% 1 figure 4. max9502g dual-package ev kit schematic diagram downloaded from: http:///
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit 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 _____________________ 7 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. evaluates: max9502g/max9502m max9502g dual-package evaluation kit figure 5a. max9502g dual-package ev kit pcb layout? (1 of 2) figure 5b. max9502g dual-package ev kit pcb layout (2 of 2) revision history pages changed at rev 1: 1, 3, 6, 7 downloaded from: http:///
|
