MAXIM MAX9516 handbook
Contents
1. SMALL SIGNAL GAIN SMALL SIGNAL GAIN FLATNESS LARGE SIGNAL GAIN vs FREQUENCY vs FREQUENCY vs FREQUENCY 20 5 3 20 3 20 20 gt 40 z z 40 3 3 35 60 60 80 80 Vout 100mVp P Vout 2Vp p 100 3 0 100 0 1 1 10 100 100 0 1 1 0 100 FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz 4 MAXIM 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Typical Operating Characteristics continued Vpp SHDN 1 8V GND z OV video output has RL 1502 connected to GND TA 25 C unless otherwise noted LARGE SIGNAL GAIN FLATNESS GROUP DELAY POWER SUPPLY REJECTION RATIO vs FREQUENCY vs FREQUENCY vs FREQUENCY 10 z 110 s 20 8 05 100 5 5 2 90 E 0 2 80 05 gt 10 ag S E o S Z 10 lt 40 3 g S 2 15 40 ib 20 30 25 80 Vout 2Vp p 10 Four 2Vp p VrippLe 100mVp p 3 0 0 100 04 0 100 01 1 100 01 1 0 100 FREQUENCY MHz FREQUENCY MHz FREQUENC2. 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 MAX9516 does not have a series capacitor the MAX9516 will not be damaged if the connector is shorted to a supply or to ground see the Short Circuit Protection section 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 MAX9516 shifts 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 output stage to remain in its linear region when driving sync below ground 9156XVMW MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect The MAX9516 has an integrated charge pump and lin ear regulator to create a low noise negative supply from the positive supply voltage The charge pump inverts the positive supply to create a raw negative volt age that is then fed into the linear regulator which fil ters 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 con
3. IS FOR PACKAGE ORIENTATION REFERENCE ONLY 6 8 10L UDFN 2x2x0 80 mm DRAWING NOT TO SCALE 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 15 2007 Maxim Integrated Products MAXIM is a registered trademark of Maxim Integrated Products Inc 9LS6XVIN
4. and the DirectDrive technology Quiescent power consumption PQ is the power consumed by the internal circuitry of the MAX9516 The formula for calculating PQ is below PQ PTOTAL PLOAD PTOTAL is the total power drawn from the supply volt age and PLOAD is the power consumed by the load attached to OUT For the MAX9516 the quiescent power consumption is typically 6mW Average power consumption which is representative of the power consumed in a real application is the tota power drawn from the supply voltage for a MAX9516 driving a 1509 load to ground with a 50 flat field Under such conditions the average power consumption MAXUM Table 1 Power Consumption of MAX9516 with Different Video Signals MAX9516 POWER All Black Screen All White Screen 75 Color Bars 50 Flat Field 11 7 for the MAX9516 is 12mW Table 1 shows the power consumption with different video signals The supply voltage is 1 8V OUT drives a 1509 load to ground 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 a 50 flat field lies in between the extremes Interfacing to Video DACs that Produce Video Signals Larger than 0 25Vp p Devices designed to generate 1Vp p video signals at the output of the video DAC can still work with the MAX9516 Most video DACs source current into a ground referenced resistor which co
5. data sheet 2Vp p VIDEO Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com 9LS6XVIN MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect ABSOLUTE MAXIMUM RATINGS Voltages with respect to GND Duration of OUT Short Circuit to Vpp Lead Temperature soldering 10s MD o O RE PE ME A OPO PA EN 0 3V to 3V GND and VSS tie il cal te ale ahs lah Ue tales alle Continuous CPGND 0 1V to 0 1V Continuous Current IN sui 0 3V to Vpp 0 3V INS SHDN LOAD utes ii die ah hee Melon Hed Moe mala 20mA OU a nina The greater of Vss and 1V to Vpp 0 3V Continuous Power Dissipation Ta 70 C HID ice Belts Mel fees atch E taut Pre tabi ches 0 3V to 4V 10 Pin DFN derate SmW C above 70 C 403mW CTP iiau 0 3V to Vpp 0 3V Operating Temperature Range SINE ii ns Moola ve ete a Vss 0 3V to 0 3V Junction Temperature No A A EN t 3V to 0 3V Storage Temperature Range 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 specifications is no
6. 19 0995 Rev 0 9 07 ON KIT E General Description Operating at 1 8V from a single power supply the MAX9516 amplifies standard definition video signals and only consumes 6mW quiescent power and 12mW average power The MAX9516 leverages Maxim s DirectDrive technology Combining DirectDrive with the external positive 1 8V supply the MAX9516 is able to drive a 2Vp p video signal into a 150Q load The MAX9516 has the ability to detect and report the pres ence of a video load and reduce power consumption when the load is not present The MAX9516 can detect the presence of a video load and report a change in load through the LOAD flag This feature helps reduce overall system power con sumption because the video encoder and the MAX9516 only need to be turned on when a video load is con nected If no load is connected the MAX9516 is placed in an active detect mode and only consumes 31W Maxim s DirectDrive technology eliminates large output coupling capacitors and sets the output video black level near ground DirectDrive reguires 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 so little noise into the video output that the picture is visibly flawless The MAX9516 features an internal reconstruction filter that smoothes the steps and reduces the spikes on the video signal from the video digital to ana
7. C 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 MAX9516 because the composite video signal is above the nominal DC cou pled OV to 0 25V input range Video Signal Routing Minimize the length of the PCB trace between the out put of the video DAC and the input of the MAX9516 to reduce coupling of external noise into the video signal If possible shield the PCB trace MAXI MAX9516 CHROMA C DC LEVEL SHIFT LOAD SENSE VIDEO AMPLIFIER Figure 6 Luma Y and Chroma C Signals Added Together to Create Composite Video Signal Which is AC Coupled Into the MAX95 16 MAKI 915S6XVMW MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Power Supply Bypassing and Ground Management The MAX9516 operates from a 1 7V to 2 625V single supply and reguires 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 s
8. Tmin to Tmax unless otherwise noted Typical values are at Vpp 1 8V Ta 25 C Note 1 PARAMETER SYMBOL CONDITIONS DC CHARACTERISTICS DC Voltage Gain Output Voltage Swing Power Supply Rejection Ratio Ay Guaranteed by output voltage swing Note 3 O s VIN s 262 5mV 1 7V s VDD s DC coupled input 2 625V O s VIN s 252 5mVp p AC coupled input ka 2 02 2 375V s VDD s 2 625V O s VIN s 325mV 2 548 1 7V s Vpp s 2 625V measured between 759 load resistors 2 6 2 652 Shutdown Input Resistance OV s IN s Vpp SHDN GND Output Resistance Shutdown Output Resistance OUT OV 5mA s ILOAD s 5MA OV s OUT s Vpp SHDN GND OUT Leakage Current SHDN GND Output Short Circuit Current AC CHARACTERISTICS Sourcing Sinking Standard Definition Reconstruction Filter Differential Gain 1dB passband flatness OUT 2Vp p reference 7 5 EMHZ requency is 100kHz f 8 5MHz f 27MHz 3 58MHz 43MHz Differential Phase Group Delay Distortion 3 58MHz 43MHz 100kHz lt f lt 5MHz OUT 2Vp p Peak Signal to RMS Noise 100kHz f s SMHz Power Supply Rejection Ratio T Pulse to Bar K Rating T Bar Response MAKINI f 100kHz VRIPPLE 100mVp p T 200ns bar time is 18us the beginning 5 and the ending 2 5 of the bar time ignored T 200ns bar time is 18us the beginn
9. Vpop uDFN MAAKLM 13 9156XVMW MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Package Information The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages PIN1 INDEX AREA TOP VIEW SIDE VIEW DRAWING NOT TO SCALE SOLDER 6 8 10L UDFN EPS MASK COVERAGE A A j N 2 1 x e BOTTOM VIE cil sn T aAa T EVEN TERMINAL ODD TERMINAL PRALLAS ZVLAXIZVI T PACKAGE OUTLINE 6 8 10L uDFN 2x2x0 80 mm APPROVAL DOCUMENT CONTROL NO 21 0164 MAXIM 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Package Information continued The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages COMMON DIMENSIONS o rs 200 205 PACKAGE VARIATIONS Procone N e gt poe tees 6 osese osno rore e21 e ososse o2s 005 1s0Rer NOTES ALL DIMENSIONS ARE IN mm ANGLES IN DEGREES COPLANARITY SHALL NOT EXCEED 0 08mm WARPAGE SHALL NOT EXCEED 0 10mm PACKAGE LENGTH PACKAGE WIDTH ARE CONSIDERED AS SPECIAL CHARACTERISTIC S D AEE THE TEL NUMBER OF IEAGS PDALLAS AVLAXL VI NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY TE PACKAGE OUTLINE MARKING
10. Y MHz QUIESCENT SUPPLY CURRENT VOLTAGE GAIN OUTPUT VOLTAGE vs TEMPERATURE vs TEMPERATURE vs INPUT VOLTAGE 5 0 s 8 2 s 20 z z 45 g 8 15 S 15 s E Z 40 8 1 g 35 8 05 S gt E 05 30 ua 80 S z 5 0 25 7 95 H z 45 2 2 7 90 ba a 15 7 85 1 0 10 7 80 45 50 25 0 25 50 75 100 125 50 25 0 25 50 75 100 125 100 50 0 50 100 150 200 250 300 350 400 TEMPERATURE C TEMPERATURE C INPUT VOLTAGE mV MAXIM 5 9LS6XVIN MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Typical Operating Characteristics continued Vpp SHDN 1 8V GND z OV video output has RL 1502 connected to GND TA 25 C unless otherwise noted DIFFERENTIAL GAIN AND PHASE 2T RESPONSE MAX9516 toc10 12 5T RESPONSE MAX9516 toc12 MAX9516 toc11 1 6 a 12 z IN im 0 8 SZ m 50mV div 5 Eua 0 4 i i a ec phet 1 2 It a 08 S 04 jr m 0 OUT ts 400mV div 400mV div a 0 0 8 za 12 3 R 1 2 3 4 5 6 7 100ns div 400ns div NTC 7 VIDEO TEST SIGNAL FIELD SOUARE WAVE AC COUPLED MAX9516 toc13 MAX9516 toc14 pp rar IN Efc ME OC IN 100mV div 100mV div OV ov P OUT 800mV div 4 OUT OV OV 800mV div 10us div 2ms div 6 MAKII 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Pin Description FUNCTION Charge Pump Negative Power Supply Bypass with a 1uF c
11. apacitor to GND Charge Pump Flying Capacitor Negative Terminal Connect a 1uF capacitor from C1P to C1N Charge Pump Ground AJN Charge Pump Flying Capacitor Positive Terminal Connect a 1uF capacitor from C1P to C1N Positive Power Supply Bypass with a 0 1uF capacitor to GND Load Detect Output LOAD goes high when an output video load is detected Ground Video Input 5 6 7 8 9 Active Low Shutdown Connect to Vpp for normal operation oO Video Output Detailed Description The MAX9516 represents Maxim s second generation of DirectDrive video amplifiers which meet the require ments of current and future portable equipment e 1 8V operation Engineers want to eliminate the 3 3V supply in favor of lower supply voltages e Lower power consumption The MAX9516 reduces average power consumption by up to 75 com pared to the 3 3V first generation devices 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 1Vp p signal at its output and the gain of 2 found in the previous gen eration of video filter amps is not enough e Active detect mode reduces power consumption DirectDrive technology is necessary for a voltage mode amplifier to output a 2Vp p video signal from a 1 8V supply The integrated inverting charge pump creates a negative supply that increases the output range an
12. d gives the video amplifier enough headroom to drive a 2Vp P video signal with a 1509 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 MAKI 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 freguency 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 freguency than the frame rate Therefore the series capacitor must be very large typically from 220uF to 3000uF For space constrained eguipment the series capacitor is unac ceptable Changing from a single series capacitor to a SAG network that reguires two smaller capacitors only reduces space and cost slightly The series capacitor in the usual output connection
13. ideo signal of approxi mately 0 25Vp p at IN AC couple the video signal to IN because the DC level of an external video signal is usu ally not well specified although it is reasonable to expect that the signal is between 2V and 2V The 10 series resistor increases the equivalent source resis tance to about 25Q which is the minimum necessary for a video source to drive the internal sync tip clamp For external video signals larger than 1Vp p operate the MAX9516 from a 2 5V supply so that IN can accom modate a 0 325Vp p video signal which is equivalent to a 1 3Vp p video signal at VIDIN Figure 5 MAX9516 Used as an Anti Alias Filter with Buffer 10 LINEAR REGULATOR LOAD SENSE 158 AKA z OUT VIDEO DECODER MAXIM 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect 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 NTS
14. ignal Bypass the analog supply VDD with a 0 1uF capacitor to GND placed as close to the device as possible Bypass Vss with a 1uF capacitor to GND as close to the device as possible The total system bypass capac itance on Vpp should be at least 10uF or ten times the capacitance between C1P and C1N Using a Digital Supply The MAX9516 was designed to operate from noisy digi tal supplies The high PSRR 54dB at 100kHz allows the MAX9516 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 inductance ESL Typical Operating Circuits MAXIM MAX9516 CLAMP LEVEL SHIFT LOAD SENSE TRANSPARENT pc Figure 7 DC Coupled Input 12 MAXIM 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Typical Operating Circuits continued MAXIM MAX9516 VIDEO AMPLIFIER DC LEVEL SHIFT LINEAR REGULATOR CHARGE PUMP Figure 8 AC Coupled Input Pin Configuration Chip Information PROCESS BiCMOS TOP VIEW OUT SHDN IN GND LOAD MAXIM MAX9516 Vss CIN CPGND CIP
15. ing 2 5 and the ending 2 5 of the bar time is ignored 9156XVMW MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect ELECTRICAL CHARACTERISTICS continued Vpp SHDN 1 8V GND z OV OUT has RL 1500 connected to GND C1 C2 1uF TA Tmin to Tmax unless otherwise noted Typical values are at Vpp 1 8V Ta 25 C Note 1 PARAMETER SYMBOL CONDITIONS MIN TYP MAX Output Impedance f 5MHz IN 80mV Vour to ViN Isolation SHDN GND f s 5 5MHz VIN to VouT Isolation SHDN GND f lt 5 5MHz CHARGE PUMP Switching Frequency LOGIC SIGNALS Logic Low Threshold VIL SHDN Vpp 1 7V to 2 625V Logic High Threshold SHDN Vpp 1 7V to 2 625V Logic Input Current Output High Voltage LOAD lOH 3mA Output Low Voltage LOAD lot 3mA Note 1 All devices are 100 production tested at Ta 25 C Specifications over temperature limits are guaranteed by design Note 2 Supply current does not include current supplied to Vout load Note 3 Voltage gain Av is a two point measurement in which the output voltage swing is divided by the input voltage swing Typical Operating Characteristics Vpp SHDN 1 8V GND OV video output has RL 150 connected to GND Ta 25 C unless otherwise noted
16. log converter DAC The reconstruction filter typically has 1dB passband flatness of 7 5MHz and 46dB typ attenua tion at 27MHz The input of the MAX9516 can be directly connected to the output of a video DAC The MAX9516 also features a transparent input sync tip clamp allowing AC cou pling of input signals with different DC biases The MAX9516 has an internal fixed gain of 8 The input full scale video signal is nominally 0 25VP p and the output full scale video signal is nominally 2Vp p Applications Digital Still Cameras DSC Digital Video Cameras DVC Mobile Phones Portable Media Players PMP Security CCTV Cameras Automotive Applications MAKIM MAKINI 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect Features 1 8V or 2 5V Single Supply Operation Low Power Consumption 6mW Quiescent 12mW Average Video Load Detect Reconstruction Filter with 5 5MHz Passband DirectDrive Sets Video Output Black Level Near Ground DC Coupled Input Output Transparent Input Sync Tip Clamp Ordering Information TOP MARK L1022 1 AAN PART PIN PACKAGE PKG CODE MAX9516ALB4T 10 uDFN 10 Note This device operates over the 40 C to 125 C operating temperature range Denotes lead free package T Tape and reel Block Diagram MAXIM MAX9516 250mVp P VIDEO TRANSPARENT CLAMP LINEAR REGULATOR SHUTDOWN CIRCUIT Pin Configuration appears at end of
17. nverts the current into a voltage Figure 3 shows a video DAC that creates a video signal from O to 1V across a 1509 resistor The following video filter amplifier has a gain of 2V V so that the output is 2Vp p The MAX9516 expects input signals that are 0 25Vp _p nominally The same video DAC can be made to work with the MAX9516 by scaling down the 150Q resistor to a 37 5Q resistor as shown in Figure 4 The 37 5 resis tor is one quarter of the 1509 resistor resulting in a video signal that is one quarter the amplitude PROCESSOR ASIC Figure 3 Video DAC generates a 1VP P signal across a 150Q resistor connected to ground 9LS6XVIN MAX9516 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect PROCESSOR ASIC MAXIM MAX9516 Figure 4 Video DAC Generates a 0 25VP P Signal Across a 37 5Q Resistor Connected to Ground MAXIM MAX9516 SHUTDOWN CIRCUIT Anti Alias Filter The MAX9516 provides anti alias filtering with buffering before an analog to digital converter ADC which is present in an NTSC PAL video decoder for example Figure 5 shows an example application circuit An exter nal composite video signal is applied to VIDIN which is terminated with a total of 74Q 56Q and 18Q resistors to ground The signal is attenuated by four and then AC coupled to IN The normal 1Vp p video signal must be attenuated because with a 1 8V supply the MAX9516 can handle only a v
18. 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 VcLP 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 Vci P multiplied by the DC voltage gain Av Short Circuit Protection In Figure 7 the MAX9516 includes a 75Q back termina tion resistor that limits short circuit Current if an external short is applied to the video output The MAX9516 also features internal output short circuit protection to prevent device damage in prototyping and applications where the amplifier output can be directly shorted Shutdown The MAX9516 features 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 MAX9516 into a low power shutdown mode In shutdown mode the sync tip clamp filter 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 MAX9516 is remarkably low because of the 1 8V operation
19. stant formed by the series capacitor and series resistance usually 1500 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 Load Detection The MAX9516 provides a video load detection feature The device enters active detect mode when it is enabled SHDN Vpp Every 128ms the part checks for a load by connecting a 7 5k pullup resistor to the video output for ims If the video output is pulled up during the test then no load is present and LOAD is low If the video output stays low during the test then a load is connected and LOAD goes high The state of LOAD is latched during the sleep time between sense pulses All load detect changes are deglitched over a nominal 128ms period The status of the video load must remain constant during this deglitch period for LOAD to change state If a load is detected the part enters the full operation mode and the amplifier filter and sync tip clamp turn on The part then continually checks if the load is pre sent by sensing the sinking load current Therefore a black burst signal or output signal lt OV is required
20. t implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS Vpp SHDN 1 8V GND OV OUT has RL 1500 connected to GND C1 C2 1pF TA Tmin to Tmax unless otherwise noted Typical values are at Vpp PARAMETER Supply Voltage Range SYMBOL 1 8V Ta 25 C Note 1 CONDITIONS Guaranteed by PSRR Supply Current Full operation mode Amplifier ON VIN OmV Note 2 SHDN VpD Active detect mode no load Shutdown Supply Current SHDN GND Output Load Detect Threshold Output Level RL to GND IN lt 80mV DC COUPLED INPUT Input Voltage Range Guaranteed by output voltage swing 1 7V s Vpp s 2 625V 2 375V lt VDD s 2 625V Input Current IN 130mV Input Resistance AC COUPLED INPUT Sync Tip Clamp Level 10mV s IN s 250mV Cin 0 1uF Input Voltage Swing Sync Crush Guaranteed by 1 7V s VDD s 2 625V output voltage swing 2 375V s Vpp s 2 625V Percentage reduction in sync pulse at output RSOURCE 37 59 Cin 0 1uF Input Clamping Current Line Time Distortion IN 130mV Cin 0 1UF Minimum Input Source Resistance MAKII 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect ELECTRICAL CHARACTERISTICS continued Vpp SHDN 1 8V GND OV OUT has RL 1500 connected to GND C1 C2 1pF TA
21. to maintain the detected load status If the load remains present the LOAD pin remains high If the load is removed LOAD goes low and the part goes back to the active detect mode in which power consumption is typically 31uW INPUT 500mV div d OUTPUT Mm 500mV div 2ms div Figure 1 AC Coupled Output cia INPUT f 500mV div OUTPUT 1V div 2ms div Figure 2 DirectDrive Output Video Reconstruction Filter The MAX9516 includes an internal five pole Butterworth lowpass filter to condition the video signal The reconstruction 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 recon struction filter typically has 1dB passband flatness of 7 5MHz and 46dB typ attenuation at 27MHz Transparent Sync Tip Input Clamp The MAX9516 contains an integrated transparent sync tip clamp When using a DC coupled input the sync tip clamp does not affect the input signal as long as it remains above ground When using an AC cou MAAKLM 1 8V Ultra Low Power DirectDrive Video Filter Amplifier with Load Detect pled input the sync tip clamp automatically clamps the input signal to ground preventing it from going lower A small current of 2UA pulls down on the input to prevent an AC coupled signal from drifting outside the input range
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MAXIM MAX9516 handbook