19-3021; Rev 0; 10/03 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current Features ♦ Single +5V Operation ♦ Input Sync-Tip Clamp ♦ AC- or DC-Coupled Output ♦ Low-Power Shutdown Mode Reduces Supply Current to 150nA ♦ SAG Correction Reduces Output-Coupling Capacitors from 330µF to 22µF ♦ Available in Space-Saving SOT23 and SC70 Packages 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 -40°C to +85°C temperature range. Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK MAX4032EXT-T -40°C to +85°C 6 SC70-6 ACC MAX4032EUT-T -40°C to +85°C 6 SOT23-6 ABSP Applications Portable Video/Game Systems/DVD Players Digital Camcorders/Televisions/Still Cameras PDAs Block Diagram Video-Enabled Cell Phones Notebook Computers Portable/Flat-Panel Displays TOP VIEW Pin Configuration VCC MAX4032 IN OUT TOP VIEW OUT 1 6 SAG 2.3kΩ CLAMP SAG GND 2 MAX4032 580Ω 5 SHDN 4 VCC 780Ω 1.2kΩ SHDN IN 3 SC70/SOT23 GND ________________________________________________________________ Maxim Integrated Products 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. 1 MAX4032 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, 150Ω 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 330µF ACcoupling capacitor to two small, less expensive 22µF 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. MAX4032 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current 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 = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........695mW 6-Pin SC70 (derate 3.1mW/°C above +70°C) .............245mW Operating Temperature Range ..........................-40°C to +85°C Junction Temperature .....................................................+150°C Storage Temperature Range ............................-65°C to +150°C Lead Temperature (soldering, 10s) ................................+300°C 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 = 0.1µF from IN to GND, RL = infinity to GND, SAG shorted to OUT, SHDN = 5.0V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP UNITS Supply Voltage Range VCC Guaranteed by PSRR 5.5 V Quiescent Supply Current ICC VIN = VCLP 6.5 10 mA Shutdown Supply Current ISHDN SHDN = 0V 0.15 1 µA Input Clamp Voltage VCLP Input referred 0.27 0.38 0.47 V Input Voltage Range VIN Inferred from voltage gain (Note 3) VCLP Input Bias Current IBIAS 4.5 MAX VIN = 1.45V 22.5 Input Resistance VCLP + 0.5V < VIN < VCLP + 1V Voltage Gain RL = 150Ω to GND, 0.5V < VIN < 1.45V (Note 4) 1.9 2 PSRR 4.5V < VCC < 5.5V 60 80 Output Voltage High Swing VOH RL = 150Ω to GND 4.3 Output Voltage Low Swing VOL RL = 150Ω to GND Power-Supply Rejection Ratio Output Current AV IOUT Output Short-Circuit Current ISC SHDN Logic-Low Threshold VIL SHDN Logic-High Threshold SHDN Input Current Shutdown Output Impedance 2 µA 45 85 Sinking, RL = 20Ω to VCC 40 85 OUT shorted to VCC or GND MΩ 2.1 V 0.47 V mA 110 mA VCC x 0.3 VCC x 0.7 V V 0.003 SHDN = 0V V/V dB 4.6 Sourcing, RL = 20Ω to GND VIH (Disabled) V 35 3 VCLP IIH, IIL ROUT 1.45 At DC 4 At 3.58MHz or 4.43MHz 2 _______________________________________________________________________________________ 1 µA kΩ 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current (VCC = 5.0V, GND = 0V, COUT = CSAG = 22µF, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, SHDN = 5.0V, TA = +25°C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth SYMBOL CONDITIONS MIN TYP MAX UNITS BWSS VOUT = 100mVP-P 55 MHz BWLS VOUT = 2VP-P 45 MHz Small-Signal 0.1dB Gain Flatness BW0.1dBSS VOUT = 100mVP-P 18 MHz Large-Signal 0.1dB Gain Flatness BW0.1dBLS VOUT = 2VP-P SR VOUT = 2V step 17 MHz 275 V/µs Slew Rate Settling Time to 0.1% tS Power-Supply Rejection Ratio PSRR Output Impedance ZOUT VOUT = 2V step 25 ns f = 100kHz 50 dB f = 5MHz 2.5 Ω Differential Gain DG NTSC 0.4 % Differential Phase DP NTSC 0.6 Degrees Group Delay D/dT f = 3.58MHz or 4.43MHz 20 ns Peak Signal to RMS Noise SNR VIN = 1VP-P, 10MHz BW 65 dB CIN = 0.1µF (Note 4) 2 Droop 3 % SHDN Enable Time tON VIN = VCLP + 1V, SHDN = 5V, VOUT settled to within 1% of the final voltage 250 ns SHDN Disable Time tOFF VIN = VCLP + 1V, SHDN = 0V, VOUT settled to below 1% of the output voltage 50 ns Note 2: All devices are 100% production tested at TA = +25°C. 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 MAX4032 AC ELECTRICAL CHARACTERISTICS Typical Operating Characteristics (VCC = 5.0V, GND = 0V, COUT = CSAG = 22µF, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, SHDN = VCC, TA = +25°C, unless otherwise noted.) SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY 0.2 0.1 -0.3 -0.4 -0.5 -6 1M 100M 10M -4 AV = 2 VOUT = 100mVP-P -5 AV = 2 VOUT = 2VP-P -6 100k 1M 100M 10M 100k 1M 100M 10M FREQUENCY (Hz) FREQUENCY (Hz) LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY POWER-SUPPLY REJECTION RATIO vs. FREQUENCY QUIESCENT SUPPLY CURRENT vs. TEMPERATURE 0.1 PSRR (dB) -0.1 -0.2 -30 -40 -50 -0.3 6.75 6.70 SUPPLY CURRENT (mA) -20 -60 -0.4 1M 6.55 6.50 6.45 6.30 10k 100M 10M 6.60 6.35 -80 100k 1M 100M 10M -50 -25 0 25 50 75 FREQUENCY (Hz) FREQUENCY (Hz) TEMPERATURE (°C) CLAMP VOLTAGE vs. TEMPERATURE VOLTAGE GAIN vs. TEMPERATURE OUTPUT VOLTAGE HIGH SWING vs. TEMPERATURE 2.05 0.50 GAIN (V/V) 0.45 0.40 2.00 0.35 1.95 0.30 4.9 OUTPUT VOLTAGE HIGH (V) 0.55 5.0 100 MAX4032 toc09 2.10 MAX4032 toc07 0.60 MAX4032 toc08 100k 6.65 6.40 -70 AV = 2 VOUT = 2VP-P MAX4032 toc06 -10 0 6.80 MAX4032 toc05 0 MAX4032 toc04 0.2 4.8 4.7 4.6 4.5 4.4 4.3 4.2 0.25 4.1 1.90 0.20 -50 -25 0 25 50 TEMPERATURE (°C) 4 -2 FREQUENCY (Hz) 0.3 -0.6 -1 -3 -0.6 100k GAIN (dB) -0.2 -4 AV = 2 VOUT = 100mVP-P 0 -0.1 -3 -0.5 1 GAIN (dB) -2 -5 2 0 GAIN (dB) GAIN (dB) 0 -1 MAX4032 toc03 1 3 MAX4032 toc02 2 LARGE-SIGNAL GAIN vs. FREQUENCY 0.3 MAX4032 toc01 3 VCLAMP (V) MAX4032 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current 75 100 4.0 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 -50 -25 0 25 50 TEMPERATURE (°C) _______________________________________________________________________________________ 75 100 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current SMALL-SIGNAL PULSE RESPONSE VIN 25mV/div VOUT 1V/div DIFFERENTIAL PHASE (°) VIN 500mV/div VOUT 50mV/div 10ns/div PIN NAME 1 OUT Video Output 2 GND Ground 3 IN VCC 5 SHDN 6 SAG 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 10ns/div Pin Description 4 DIFFERENTIAL GAIN AND PHASE MAX4032 toc11 DIFFERENTIAL GAIN (%) MAX4032 toc10 MAX4032 toc12 LARGE-SIGNAL PULSE RESPONSE 0 1 2 3 4 5 6 0 1 2 3 4 5 6 Typical Application Circuit FUNCTION VCC Video Input Power-Supply Voltage. Bypass with a 0.1µF capacitor to ground as close to the pin as possible. Shutdown. Pull SHDN low to place the MAX4032 in low-power shutdown mode. MAX4032 IN COUT OUT RIN RL CLAMP CSAG Sag Correction SAG SHDN GND _______________________________________________________________________________________ 5 MAX4032 Typical Operating Characteristics (continued) (VCC = 5.0V, GND = 0V, COUT = CSAG = 22µF, CIN = 0.1µF, RIN = 75Ω to GND, RL = 150Ω to GND, SHDN = VCC, TA = +25°C, unless otherwise noted.) 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, 150Ω 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 330µF AC-coupling capacitor to two small, less expensive 22µF 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 150Ω is directly connected from OUT to ground (see Figure 2). 2) Two capacitors and 150Ω 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 22µF, 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 10µF to 47µF for comparison. Although values lower than 22µF 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 47µF 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 0.1µF 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 150Ω 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 >330µF. The MAX4032 reduces the value of this coupling capacitor, replacing it with a pair of 22µF 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 par- 80 FIELD TIME DISTORTION IN % PEAK TO PEAK (%) MAX4032 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current 60 40 20 10 30 40 20 COUPLING CAPACITANCE (µF) 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 0.1µF RSOURCE 75Ω SHDN MAX4032 CIN 0.1µF IN OUT RIN 75Ω ESIGNAL ROUT 75Ω EOUT RL 75Ω CLAMP SAG GND Figure 2. DC-Coupling the MAX4032 VCC = 5V VCC RSOURCE 75Ω ESIGNAL SHDN MAX4032 CIN 0.1µF CBYP 0.1µF IN COUT 22µF OUT RIN 75Ω ROUT 75Ω EOUT RL 75Ω CLAMP CSAG 22µF SAG GND Figure 3. AC-Coupling the MAX4032 _______________________________________________________________________________________ 7 MAX4032 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 0.5µF 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 100Ω typically to function properly. This is easily met by the 75Ω 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. 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 150Ω, 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 150Ω. 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. 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 0.1µF 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. Chip Information TRANSISTOR COUNT: 755 PROCESS: BiCMOS AC-Coupling the Output 8 _______________________________________________________________________________________ 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current SC70, 6L.EPS _______________________________________________________________________________________ 9 MAX4032 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.) 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 MAX4032 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current 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 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.