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19-3021; Rev 0; 10/03 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current General Description The MAX4032 5V, 6dB video buffer with sync-tip clamp, output sag correction, and low-power shutdown mode is available in tiny SOT23 and SC70 packages. The sag-corrected output of the MAX4032 is designed to drive AC-coupled, 150 back-terminated video loads in portable video applications such as digital still cams, portable DVD players, digital camcorders, PDAs, videoenabled cell phones, portable game systems, and notebook computers. The sag correction feature introduces low-frequency compensation that reduces the value of the normally bulky and expensive 330F ACcoupling capacitor to two small, less expensive 22F capacitors. The input clamp positions the video waveform at the output and allows the MAX4032 to be used as either an AC- or DC-coupled output driver. The MAX4032 operates from a single +5V supply and consumes only 6.5mA of supply current. The low-power shutdown mode reduces the supply current to 150nA, making the MAX4032 ideal for low-voltage, batterypowered video applications. The MAX4032 is available in tiny 6-pin SOT23 and SC70 packages and is specified over the extended -40C to +85C temperature range. PART MAX4032EXT-T MAX4032EUT-T Features o Single +5V Operation o Input Sync-Tip Clamp o AC- or DC-Coupled Output o Low-Power Shutdown Mode Reduces Supply Current to 150nA o SAG Correction Reduces Output-Coupling Capacitors from 330F to 22F o Available in Space-Saving SOT23 and SC70 Packages MAX4032 Ordering Information TEMP RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SC70-6 6 SOT23-6 TOP MARK ACC ABSP Applications Portable Video/Game Systems/DVD Players Digital Camcorders/Televisions/Still Cameras PDAs Video-Enabled Cell Phones Notebook Computers Portable/Flat-Panel Displays TOP VIEW VCC Block Diagram Pin Configuration TOP VIEW OUT 1 6 SAG MAX4032 IN OUT CLAMP 2.3k SAG GND 2 MAX4032 580 5 SHDN 1.2k 780 SHDN IN 3 4 VCC GND SC70/SOT23 ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4032 ABSOLUTE MAXIMUM RATINGS VCC to GND ............................................................. -0.3V to +6V OUT, SAG, SHDN to GND......................... -0.3V to (VCC + 0.3V) IN to GND (Note 1) ................................... VCLP to (VCC + 0.3V) IN Short-Circuit Duration from -0.3V to VCLP ........................1min Output Short-Circuit Duration to VCC or GND .......... Continuous Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C) ...........695mW 6-Pin SC70 (derate 3.1mW/C above +70C) .............245mW Operating Temperature Range ..........................-40C to +85C Junction Temperature .....................................................+150C Storage Temperature Range ............................-65C to +150C Lead Temperature (soldering, 10s) ................................+300C Note 1: VCLP is the input clamp voltage as defined in the DC Electrical Characteristics table. 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 not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (VCC = 5.0V, GND = 0V, CIN = 0.1F from IN to GND, RL = infinity to GND, SAG shorted to OUT, SHDN = 5.0V, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Supply Voltage Range Quiescent Supply Current Shutdown Supply Current Input Clamp Voltage Input Voltage Range Input Bias Current Input Resistance Voltage Gain Power-Supply Rejection Ratio Output Voltage High Swing Output Voltage Low Swing Output Current Output Short-Circuit Current SHDN Logic-Low Threshold SHDN Logic-High Threshold SHDN Input Current Shutdown Output Impedance AV PSRR VOH VOL IOUT ISC VIL VIH IIH, IIL At DC ROUT (Disabled) SYMBOL VCC ICC ISHDN VCLP VIN IBIAS VIN = VCLP SHDN = 0V Input referred CONDITIONS Guaranteed by PSRR MIN 4.5 TYP 6.5 0.15 MAX 5.5 10 1 0.47 1.45 35 UNITS V mA A V V A M 0.27 VCLP 0.38 22.5 3 Inferred from voltage gain (Note 3) VIN = 1.45V VCLP + 0.5V < VIN < VCLP + 1V RL = 150 to GND, 0.5V < VIN < 1.45V (Note 4) 4.5V < VCC < 5.5V RL = 150 to GND RL = 150 to GND Sourcing, RL = 20 to GND Sinking, RL = 20 to VCC OUT shorted to VCC or GND 1.9 60 4.3 45 40 2 80 4.6 VCLP 85 85 110 2.1 V/V dB V 0.47 V mA mA VCC x 0.3 VCC x 0.7 0.003 4 2 SHDN = 0V At 3.58MHz or 4.43MHz 1 V V A k 2 _______________________________________________________________________________________ 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current AC ELECTRICAL CHARACTERISTICS (VCC = 5.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = 5.0V, TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth Small-Signal 0.1dB Gain Flatness Large-Signal 0.1dB Gain Flatness Slew Rate Settling Time to 0.1% Power-Supply Rejection Ratio Output Impedance Differential Gain Differential Phase Group Delay Peak Signal to RMS Noise Droop SHDN Enable Time SHDN Disable Time tON tOFF SYMBOL BWSS BWLS VOUT = 2VP-P CONDITIONS VOUT = 100mVP-P MIN TYP 55 45 18 17 275 25 50 2.5 0.4 0.6 20 65 2 250 50 3 MAX UNITS MHz MHz MHz MHz V/s ns dB % Degrees ns dB % ns ns MAX4032 BW0.1dBSS VOUT = 100mVP-P BW0.1dBLS VOUT = 2VP-P SR VOUT = 2V step tS PSRR ZOUT DG DP D/dT SNR VOUT = 2V step f = 100kHz f = 5MHz NTSC NTSC f = 3.58MHz or 4.43MHz VIN = 1VP-P, 10MHz BW CIN = 0.1F (Note 4) VIN = VCLP + 1V, SHDN = 5V, VOUT settled to within 1% of the final voltage VIN = VCLP + 1V, SHDN = 0V, VOUT settled to below 1% of the output voltage Note 2: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 3: Voltage gain (AV) is referenced to the clamp voltage, i.e., an input voltage of VIN = VCLP + VI would produce an output voltage of VOUT = VCLP + AV x VI. Note 4: Droop is guaranteed by the input bias current specification. _______________________________________________________________________________________ 3 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4032 Typical Operating Characteristics (VCC = 5.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = VCC, TA = +25C, unless otherwise noted.) SMALL-SIGNAL GAIN vs. FREQUENCY MAX4032 toc01 SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY MAX4032 toc02 LARGE-SIGNAL GAIN vs. FREQUENCY 2 1 0 GAIN (dB) -1 -2 -3 -4 MAX4032 toc03 3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 100k 1M 10M AV = 2 VOUT = 100mVP-P 0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 AV = 2 VOUT = 100mVP-P 100k 1M 10M 3 -5 -6 100M AV = 2 VOUT = 2VP-P 100k 1M 10M 100M 100M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY MAX4032 toc04 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX4032 toc05 QUIESCENT SUPPLY CURRENT vs. TEMPERATURE 6.75 6.70 SUPPLY CURRENT (mA) 6.65 6.60 6.55 6.50 6.45 6.40 6.35 6.30 MAX4032 toc06 0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 AV = 2 VOUT = 2VP-P 100k 1M 10M 0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 10k 100k 1M FREQUENCY (Hz) 10M 6.80 100M 100M -50 -25 0 25 50 75 100 FREQUENCY (Hz) TEMPERATURE (C) CLAMP VOLTAGE vs. TEMPERATURE MAX4032 toc07 VOLTAGE GAIN vs. TEMPERATURE MAX4032 toc08 OUTPUT VOLTAGE HIGH SWING vs. TEMPERATURE 4.9 OUTPUT VOLTAGE HIGH (V) 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 MAX4032 toc09 0.60 0.55 0.50 VCLAMP (V) 2.10 5.0 2.05 GAIN (V/V) 0.45 0.40 0.35 0.30 0.25 0.20 -50 -25 0 25 50 75 100 TEMPERATURE (C) 2.00 1.95 1.90 -50 -25 0 25 50 75 100 TEMPERATURE (C) 4.0 -50 -25 0 25 50 75 100 TEMPERATURE (C) 4 _______________________________________________________________________________________ 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current Typical Operating Characteristics (continued) (VCC = 5.0V, GND = 0V, COUT = CSAG = 22F, CIN = 0.1F, RIN = 75 to GND, RL = 150 to GND, SHDN = VCC, TA = +25C, unless otherwise noted.) MAX4032 LARGE-SIGNAL PULSE RESPONSE MAX4032 toc10 SMALL-SIGNAL PULSE RESPONSE MAX4032 toc11 DIFFERENTIAL GAIN AND PHASE 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 1.0 0.8 0.6 0.4 0.2 0 -0.2 DIFFERENTIAL GAIN (%) MAX4032 toc12 VIN 500mV/div VIN 25mV/div 0 1 2 3 4 5 6 VOUT 1V/div VOUT 50mV/div DIFFERENTIAL PHASE () 10ns/div 10ns/div 0 1 2 3 4 5 6 Pin Description PIN 1 2 3 4 NAME OUT GND IN VCC Video Output Ground Video Input Power-Supply Voltage. Bypass with a 0.1F capacitor to ground as close to the pin as possible. Shutdown. Pull SHDN low to place the MAX4032 in low-power shutdown mode. Sag Correction IN Typical Application Circuit VCC FUNCTION MAX4032 COUT OUT RIN CLAMP RL 5 6 SHDN SAG CSAG SAG SHDN GND _______________________________________________________________________________________ 5 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4032 Detailed Description The MAX4032 5V, 6dB video buffer with sync-tip clamp, output sag correction, and low-power shutdown mode is available in tiny SOT23 and SC70 packages. The sag-corrected output of the MAX4032 is designed to drive AC-coupled, 150 back-terminated video loads in portable video applications such as digital still cams, portable DVD players, digital camcorders, PDAs, video-enabled cell phones, portable game systems, and notebook computers. The sag correction feature introduces low-frequency compensation that reduces the value of the normally bulky and expensive 330F AC-coupling capacitor to two small, less expensive 22F capacitors. The input clamp positions the video waveform at the output and allows the MAX4032 to be used as either an AC- or DC-coupled output driver. The MAX4032 operates from a single 5V supply and consumes only 6.5mA of supply current. The low-power shutdown mode reduces the supply current to 150nA, making the MAX4032 ideal for low-voltage, batterypowered video applications. The input signal to the MAX4032 is AC-coupled through a capacitor into an active sync-tip clamp circuit, which places the minimum of the video signal at approximately 0.38V. The output buffer amplifies the video signal while still maintaining the 0.38V clamp voltage at the output. For example, if VIN = 0.38V, then VOUT = 0.38V. If VIN = (0.38V + 1V) = 1.38V, then VOUT = (0.38V + 2 X (1V)) = 2.38V when SAG is shorted OUT. There are two common output connections for the MAX4032: 1) SAG is shorted to OUT and 150 is directly connected from OUT to ground (see Figure 2). 2) Two capacitors and 150 are connected between OUT, SAG, and ground (see Figure 3). allel with the normal output, as shown in Figure 3. This allows the use of two smaller capacitors (COUT and CSAG), typically 22F, substantially reducing the size of the interface caps and their cost while retaining the lowfrequency response. The minimum value of the output-coupling capacitor is a function of the acceptable Field Tilt. In Figure 1, the Field Tilt is given for several values of capacitance from 10F to 47F for comparison. Although values lower than 22F may have acceptable Field Tilt, they are not recommended, since tolerance, aging, and voltage and temperature coefficients reduce the capacitance in actual applications. Increasing the outputcoupling capacitors beyond 47F does not improve performance. Shutdown Mode The MAX4032 features a low-power shutdown mode (ISHDN = 150nA) for battery-powered/portable applications. Pulling the SHDN pin high enables the output. Connecting the SHDN pin to ground (GND) disables the output and places the MAX4032 into a low-power shutdown mode. Applications Information Input Coupling the MAX4032 The MAX4032 input must be AC-coupled because the input capacitor stores the clamp voltage. The MAX4032 requires a typical value of 0.1F for the input clamp to meet the Line Droop specification. A minimum of a ceramic capacitor with an X7R temperature coefficient is recommended to avoid temperature-related problems with Line Droop. For extended temperature operation, such as outdoor applications, or where the impressed 100 Sag Correction Sag correction refers to the low-frequency compensation of the highpass filter formed by the 150 load of a back-terminated coax and the output-coupling capacitor. This break point must be low enough in frequency to pass the Vertical Sync Interval (<25Hz for PAL and <30Hz for NTSC) to avoid Field Tilt. Traditionally, the break point is made <3~5Hz, and the coupling capacitor must be very large, typically >330F. The MAX4032 reduces the value of this coupling capacitor, replacing it with a pair of 22F capacitors. This is done by putting a resistor network in series with the feedback, raising the gain, and creating a high-impedance node at the SAG output. This node is AC-coupled to the load in par80 FIELD TIME DISTORTION IN % PEAK TO PEAK (%) 60 40 20 10 30 40 20 COUPLING CAPACITANCE (F) 50 Figure 1. Field Tilt vs. Output-Coupling Capacitance 6 _______________________________________________________________________________________ 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4032 VCC = 5V VCC CBYP 0.1F CIN 0.1F IN OUT CLAMP RSOURCE 75 MAX4032 SHDN ROUT 75 ESIGNAL RIN 75 EOUT RL 75 SAG GND Figure 2. DC-Coupling the MAX4032 VCC = 5V VCC SHDN CBYP 0.1F RSOURCE 75 CIN 0.1F IN MAX4032 COUT 22F OUT CLAMP CSAG 22F SAG ROUT 75 ESIGNAL RIN 75 EOUT RL 75 GND Figure 3. AC-Coupling the MAX4032 _______________________________________________________________________________________ 7 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current voltage is close to the rated voltage of the capacitor, a film dielectric is recommended. Increasing the capacitor value slows the clamp capture time. Values above 0.5F should be avoided since they do not improve the clamp's performance. The active sync-tip clamp also requires that the input impedance seen by the input capacitor be less than 100 typically to function properly. This is easily met by the 75 input resistor prior to the input-coupling capacitor and the back termination from a prior stage. Insufficient input resistance to ground causes the MAX4032 to appear to oscillate. Never operate the MAX4032 in this mode. MAX4032 The MAX4032's output is configured to support ACcoupling with minimal capacitance. This is called "sag correction." It refers to the improved bandwidth achieved by using two smaller capacitors to replace a single large capacitor shown in Figure 3. Layout and Power-Supply Bypassing The MAX4032 operates from a single 5V supply. Bypass the supply with a 0.1F capacitor as close to the pin as possible. Maxim recommends using 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 wire-wrap boards; they are too inductive. * Do not use IC sockets; they increase parasitic capacitance and inductance. * 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. Output Coupling the MAX4032 The output of the MAX4032 can be AC- or DC-coupled to the load. In the DC-coupled mode, the MAX4032 provides accurate sync-tip clamping for single-supply operation and still can drive a 150, back-terminated load. In the AC-coupled mode, the MAX4032 allows the use of minimal size capacitors to drive a back-terminated video load of 150. DC-Coupling the Output By shorting SAG to OUT, the device becomes an amplifier with DC restore, optimally placing the video within the dynamic range of the output. In this mode, the MAX4032 can be used as the input conditioner for a video signal, providing gain and biasing in single-supply applications. DC-coupling also improves the MAX4032's performance in terms of differential gain and phase. This reflects the improvement in the low-frequency response due to DC-coupling. AC-Coupling the Output Chip Information TRANSISTOR COUNT: 755 PROCESS: BiCMOS 8 _______________________________________________________________________________________ 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current 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.) SC70, 6L.EPS MAX4032 _______________________________________________________________________________________ 9 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current MAX4032 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.) 6LSOT.EPS PACKAGE OUTLINE, SOT-23, 6L 21-0058 F 1 1 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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