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Max4135/6 Ds - Maxim Integrated

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19-1092; Rev 1; 9/99 KIT ATION EVALU E L B A AVAIL 1-Input/6-Output Video Distribution Amplifiers The MAX4135 achieves a -3dB bandwidth of 185MHz, with 0.1dB gain flatness to 40MHz. The MAX4136’s -3dB bandwidth is 140MHz. Both devices deliver a 1000V/µs slew rate, as well as exceptional full-power bandwidths of 185MHz and 140MHz, respectively. A 25ns channel switching time enables rapid multiplexing for picture-in-picture applications, yet maintains a high off-isolation of 75dB and all-hostile crosstalk of -50dB (f = 30MHz). The MAX4135/MAX4136’s on-board logic selects any combination of the six signal outputs. Each output is capable of swinging ±2V and delivering 65mA. For applications that require a 1-input/4-output distribution amplifier, see the MAX4137/MAX4138 data sheet. _____________________Selector Guide PART NO. OF OUTPUTS GAIN (V/V) -3dB BANDWIDTH (MHz) MAX4135 6 Fixed 2 185 MAX4136 6 ≥2 140 MAX4137 4 Fixed 2 185 MAX4138 4 ≥2 140 ________________________Applications Video Switching and Distribution High-Resolution RGB CRT Monitors ____________________________Features ♦ Fixed Gain of 2V/V (MAX4135) External Gain Set (MAX4136) ♦ High Speed: 185MHz -3dB Bandwidth (MAX4135) 140MHz -3dB Bandwidth (MAX4136) 1000V/µs Slew Rate ♦ High Full-Power Bandwidths (VOUT = 2VP-P): 185MHz (MAX4135) 140MHz (MAX4136) ♦ 0.1dB Gain Flatness to 40MHz ♦ Low Differential Gain/Phase Error: 0.10%/0.02° ♦ High-Impedance Output Disable ______________Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4135EWG -40°C to +85°C 24 Wide SO MAX4136EWG -40°C to +85°C 24 Wide SO Pin Configuration TOP VIEW OUT1 1 24 SEL1 VCCO 2 23 SEL2 OUT2 3 22 SEL3 AGND 4 21 AGND OUT3 5 MAX4135 MAX4136 20 IN+ High-Speed Analog Bus Drivers VEEO 6 RF Signal Processing VEEO 7 18 AGND (RG) Composite Video Preamplifiers OUT4 8 17 N.C. (RF) AGND 9 16 VCCI OUT5 10 15 SEL4 19 VEEI VCCO 11 14 SEL5 OUT6 12 13 SEL6 SO ( ) ARE FOR MAX4136. ________________________________________________________________ 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 MAX4135/MAX4136 _______________General Description The MAX4135/MAX4136 are 1-input/6-output voltagefeedback amplifiers that combine high speed with fast switching for video distribution applications. The MAX4135 is internally set for a closed-loop gain of 2V/V, while the MAX4136 can be externally set for gains of 2V/V or greater. MAX4135/MAX4136 1-Input/6-Output Video Distribution Amplifiers ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (VCC to VEE).......................................12V Voltage on Any Input Pin to GND .......(VCC + 0.3V) to (VEE - 0.3V) Short-Circuit Duration to GND....................................Continuous Continuous Power Dissipation (TA = +70°C) 24-Pin Wide SO (derate 19.3mW/°C above +70°C) ......1.54W Operating Temperature Range MAX4135EWG/MAX4136EWG ........................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C 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 = 5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Offset Voltage SYMBOL VOS Input Offset Voltage Match Between Channels Input Offset Voltage Drift Input Bias Current TCVOS IB TYP MAX UNITS VOUT = 0, RL = ∞ CONDITIONS MIN 1 10 mV VOUT = 0, RL = ∞ 1 8 mV VOUT = 0, RL = 150Ω 30 VOUT = 0, RL = 150Ω, VCM = 0 4.5 µV/°C 13 µA Common-Mode Input Resistance RIN(CM) MAX4136, either input 5 MΩ Common-Mode Input Capacitance CIN(CM) MAX4136, either input 2 pF 7 88 2.4 30 2 nV/√Hz µVRMS pA/√Hz nARMS pF ±2.5 V 60 65 45 70 2.6 -2.5 65 dB dB Input Voltage Noise en Input Current Noise in Input Capacitance CIN Common-Mode Input Voltage Range VCM Common-Mode Rejection Ratio Power-Supply Rejection Ratio Quiescent Supply Current CMRR PSRR ISY f = 1MHz f = 1MHz to 100MHz f = 1MHz f = 1MHz to 100MHz MAX4136 MAX4136, VCM = ±2.5V VS = ±4.75V to ±5.25V VIN = 0 Output Voltage Swing VOUT RL = 150Ω Output Current Drive SEL High Threshold SEL Low Threshold SEL Input Current IOUT VIH VIL ISEL RL = 30Ω 2 55 all channels off all channels on positive negative 2.2 -2.0 45 65 90 V 2.0 0.8 1 _______________________________________________________________________________________ mA 5 mA V V µA 1-Input/6-Output Video Distribution Amplifiers (VCC = 5V, VEE = -5V, AVCL = 2V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER -3dB Bandwidth SYMBOL BW-3dB Full-Power Bandwidth FPBW 0.1dB Bandwidth CONDITIONS MIN VOUT ≤ 0.1VRMS, AVCL = 2V/V MAX4135 185 MAX4136 140 VOUT = 2VP-P, AVCL = 2V/V MAX4135 185 MAX4136 140 AVCL = 2V/V Slew Rate Settling Time TYP SR -2V ≤ VOUT ≤ 2V ts MHz MHz 40 MHz V/µs -1V ≤ VOUT ≤ 1V/V, RL = 150Ω, AVCL = 2V/V to 0.1% 17 to 0.01% 40 DG f = 3.58MHz, AVCL = 2V/V MAX4135 0.10 MAX4136 0.10 Differential Phase DP f = 3.58MHz, AVCL = 2V/V MAX4135 0.02 MAX4136 0.02 Off-Isolation UNITS 1000 Differential Gain All-Hostile Crosstalk MAX ns % degrees VIN = 1VP-P, f = 30MHz -50 dB VIN = 1VP-P, f = 30MHz 75 dB Channel Switching Off Time tOFF 25 ns Channel Switching On Time tON 25 ns Digital Switching Feedthrough VIN = 0VDC ±1 mV Spurious-Free Dynamic Range SFDR fC = 5MHz, AVCL = 2V/V, VOUT = 2VP-P, RL = 100Ω -72 dBc Output On-Resistance ROUT f = DC, AVCL = 2V/V 1 Ω Output Off-Resistance ROUT f = DC, AVCL = 2V/V 200 kΩ Output On-Capacitance COUT(ON) 2 pF Output Off-Capacitance COUT(OFF) 3.5 pF _______________________________________________________________________________________ 3 MAX4135/MAX4136 AC ELECTRICAL CHARACTERISTICS __________________________________________Typical Operating Characteristics (VCC = 5V, VEE = -5V, RL = 150Ω, TA = +25°C, unless otherwise noted.) MAX4136 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = 2) 10 9 10 9 8 6 7 7 6 6 5 4 5 3 4 4 2 3 3 1 2 2 0 1 10M 100M 1M 10M 100M MAX4135 LARGE-SIGNAL GAIN vs. FREQUENCY (AVCL = 2) MAX4136 LARGE-SIGNAL GAIN vs. FREQUENCY (AVCL = 2) MAX4136 toc04 11 9 8 7 7 GAIN (dB) 8 6 -30 6 -40 -50 -60 4 4 3 3 -90 2 2 -100 1 1M 10M 100M 1M 10M 100M FREQUENCY (Hz) ALL-HOSTILE CROSSTALK vs. FREQUENCY CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY 1M 10M 100M 1G INPUT VOLTAGE NOISE vs. FREQUENCY 100 MAX4136 toc08 -20 100k FREQUENCY (Hz) 800 MAX4135/6 toc07 -10 -80 1G FREQUENCY (Hz) 0 -70 -110 100k 1G 1G -20 5 100k 100M OFF-ISOLATION vs. FREQUENCY 5 1 10M -10 OFF-ISOLATION (dB) 9 VOUT = 2VP-P 10 1M FREQUENCY (Hz) FREQUENCY (Hz) VOUT = 2VP-P 100k 1G FREQUENCY (Hz) 11 10 1 100k 1G MAX4136 toc6 1M MAX4136 toc05 100k 250 MAX4136 toc09 5 GAIN (dB) 7 8 GAIN (dB) 80 IMPEDANCE (Ω) -30 -40 -50 -60 NOISE (nV/√Hz) GAIN (dB) 8 11 MAX4136 toc02 9 GAIN (dB) 11 MAX4136 toc01 10 MAX4136 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = 10) MAX4136 toc03 MAX4135 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = 2) CROSSTALK (dB) MAX4135/MAX4136 1-Input/6-Output Video Distribution Amplifiers 25 8.0 2.5 10 -70 0.8 -80 0.25 -90 0.08 -100 100k 1M 10M FREQUENCY (Hz) 4 100M 1 100k 1M 10M FREQUENCY (Hz) 100M 1 10 100 1k 10k 100k FREQUENCY (Hz) _______________________________________________________________________________________ 1M 10M 1-Input/6-Output Video Distribution Amplifiers MAX4135 LARGE-SIGNAL PULSE RESPONSE (AVCL = 2) MAX4136 LARGE-SIGNAL PULSE RESPONSE (AVCL = 2) MAX4135 toc11 IN GND OUT GND VOLTAGE (500mV/div) VOLTAGE (500mV/div) MAX4135 toc10 IN GND OUT GND 10ns/div 10ns/div MAX4136 SMALL-SIGNAL PULSE RESPONSE (AVCL = 2) MAX4135 SMALL-SIGNAL PULSE RESPONSE (AVCL = 2) MAX4135 toc13 IN GND OUT GND VOLTAGE (50mV/div) IN GND OUT GND 10ns/div 10ns/div DIGITAL FEEDTHROUGH MAX4136 toc14 VOLTAGE (50mV/div) MAX4135 toc12 SEL 1V/div OUT 45mV/div 20ns/div _______________________________________________________________________________________ 5 MAX4135/MAX4136 Typical Operating Characteristics (continued) (VCC = 5V, VEE = -5V, RL = 150Ω, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = 5V, VEE = -5V, RL = 150Ω, TA = +25°C, unless otherwise noted.) -30 -40 -50 -60 2ND HARMONIC -70 -80 3RD HARMONIC -90 10M 1M -0.05 -0.10 -40 -0.15 0 -50 100 IRE 0.01 -60 2ND HARMONIC -70 -80 3RD HARMONIC 0.00 -0.01 -0.02 -0.03 100K 100M AVCL = 2V/V RL = 150Ω 1M 10M 100M 0 100 FREQUENCY (Hz) FREQUENCY (Hz) IRE MAX4135 OUTPUT SWING vs. LOAD RESISTANCE INPUT OFFSET VOLTAGE vs. TEMPERATURE MAX4135/6 POWER SUPPLY CURRENT vs. TEMPERATURE 8 72 1 71 70 VOLTAGE (mV) 6 5 4 3 CURRENT (mA) 0 7 -1 -2 -3 -4 50 75 100 125 150 67 64 -75 -50 -25 0 25 50 -75 -50 -25 75 100 125 150 0 25 50 75 100 125 150 LOAD RESISTANCE (Ω) TEMPERATURE (°C) TEMPERATURE (°C) INPUT BIAS CURRENT vs. TEMPERATURE POSITIVE OUTPUT VOLTAGE SWING vs. TEMPERATURE NEGATIVE OUTPUT VOLTAGE SWING vs. TEMPERATURE 7 2.9 6 -2.3 -2.4 -2.5 4 VOLTAGE (V) VOLTAGE (V) 2.8 5 2.7 2.6 -2.6 -2.7 3 2.5 -2.8 2 2.4 -2.9 1 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) MAX4135 toc23 3.0 MAX4135 toc21 8 MAX4135 toc22 25 68 65 -5 0 69 66 2 1 MAX4135 toc-20 9 MAX4135 toc19 2 MAX4135 toc18 10 6 -0.00 -30 -100 100k MAX4135 toc17 0.05 GAIN (%) -20 -90 -100 OUTPUT SWING (VP-P) AVCL = 2V/V VOUT = 2VP-P RL = 100Ω -10 PHASE (deg) -20 0 MAX4135 toc16 AVCL = 2V/V VOUT = 2VP-P RL = 100Ω HARMONIC DISTORTION (dBc) HARMONIC DISTORTION (dBc) MAX4135 toc15 0 -10 DIFFERENTIAL GAIN AND PHASE MAX4136 HARMONIC DISTORTION vs. FREQUENCY MAX4135 HARMONIC DISTORTION vs. FREQUENCY CURRENT (µA) MAX4135/MAX4136 1-Input/6-Output Video Distribution Amplifiers -3.0 2.3 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) _______________________________________________________________________________________ 1-Input/6-Output Video Distribution Amplifiers PIN NAME FUNCTION MAX4135 MAX4136 1 1 OUT1 Output 1 2, 11 2, 11 VCCO Positive Supply for Output Amplifiers. Connect to 5V. 3 3 OUT2 Output 2 4, 9, 18, 21 4, 9, 21 AGND Analog Ground 5 5 OUT3 Output 3 6, 7 6, 7 VEEO Negative Supply for Output Amplifiers. Connect to -5V. 8 8 OUT4 Output 4 10 10 OUT5 Output 5 12 12 OUT6 Output 6 13 13 SEL6 When low, enables output channel OUT6. When high, disables output channel OUT6. 14 14 SEL5 When low, enables output channel OUT5. When high, disables output channel OUT5. 15 15 SEL4 When low, enables output channel OUT4. When high, disables output channel OUT4. 16 16 VCCI Positive Supply for Input Amplifier. Connect to 5V. 17 — N.C. No Connection. Not internally connected. — 17 RF Output of Input Amplifier — 18 RG Inverting Input 19 19 VEEI Negative Supply for Input Amplifier. Connect to -5V. 20 20 IN+ Noninverting Input 22 22 SEL3 When low, enables output channel OUT3. When high, disables output channel OUT3. 23 23 SEL2 When low, enables output channel OUT2. When high, disables output channel OUT2. 24 24 SEL1 When low, enables output channel OUT1. When high, disables output channel OUT1. _______________Detailed Description The MAX4135/MAX4136 are 1-input/6-output video distribution amplifiers. The MAX4135 is configured for a fixed gain of 2, while the MAX4136 features external gain control (feedback) for closed-loop gains of 2V/V or greater. Each output provides sufficient current to drive five 150Ω loads. However, distortion will increase when driving multiple loads. The TTL/CMOS-compatible digital control (SEL_ ) enables or disables each output amplifier. When the SEL_ control input is low, the amplifier is enabled; when it is high, the amplifier is disabled and presents a high-impedance output. The enable/disable or disable/enable time is under 25ns, which is useful in multiplexing, pixel switching, or picture-in-picture applications. Each device has an input amplifier, which buffers the input from any switching glitches that may occur at the output stage, and provides a high-impedance, lowcapacitance input. The separate input buffer allows a true high output impedance when an amplifier is disabled. The outputs are protected against short circuits to ground. However, power-dissipation limits preclude shorting all output channels to ground. See the PowerDissipation Considerations section for details. _______________________________________________________________________________________ 7 MAX4135/MAX4136 ______________________________________________________________Pin Description MAX4135/MAX4136 1-Input/6-Output Video Distribution Amplifiers 75Ω* +5VDC 0.1µF 75Ω* MAX4135 OUT1 1 OUT1 VCCO 2 OUT2 3 OUT2 SW1 SEL1 24 SW2 SEL2 23 SW3 SEL3 22 AGND 4 75Ω* -5VDC 0.1µF 75Ω* 75Ω* +5VDC 0.1µF 75Ω* OUT3 5 AGND 21 IN 75Ω* VEEO 6 VEEO 7 OUT4 8 AGND 9 IN+ 20 OUT3 VIDEO IN RF OUT4 OUT5 10 VCCO 11 OUT5 OUT6 12 OUT6 RG -5VDC VEEI 19 0.1µF AGND 18 N.C. 17 VCCI 16 0.1µF SW4 SEL4 15 SW5 SEL5 14 SW6 SEL6 13 +5VDC * TO TERMINATE TRANSMISSION LINE Figure 1. MAX4135 Typical Operating Circuit __________Applications Information Grounding, Bypassing, and PC Board Layout To obtain the MAX4135/MAX4136’s full 185MHz bandwidth, Microstrip and Stripline techniques are recommended in most cases. To ensure that the PC board does not degrade the amplifier’s performance, design the board for a frequency greater than 1GHz. Even with very short traces, use these techniques at critical points, such as inputs and outputs. Whether you use a constant-impedance board or not, observe the following guidelines when designing the board: 8 • Do not use wire-wrap boards. They are too inductive. • Do not use IC sockets. They increase parasitic capacitance and inductance. • In general, surface-mount components have shorter leads and lower parasitic reactance, giving better high-frequency performance than through-hole components. • The PC board should have at least two layers, with one side a signal layer and the other a ground plane. • Keep signal lines as short and straight as possible. Do not make 90° turns; round all corners. • The ground plane should be as free from voids as possible. _______________________________________________________________________________________ 1-Input/6-Output Video Distribution Amplifiers +5VDC 0.1µF 75Ω* 75Ω* -5VDC 0.1µF 75Ω* 75Ω* +5VDC 0.1µF 75Ω* MAX4135/MAX4136 75Ω* MAX4136 OUT1 1 OUT1 VCCO 2 OUT2 3 OUT2 SW1 SEL1 24 SW2 SEL2 23 SW3 SEL3 22 AGND 4 AGND 21 OUT3 5 IN+ 20 OUT3 IN 75Ω* VEEO 6 VEEO 7 OUT4 8 AGND 9 VIDEO IN -5VDC VEEI 19 RG 18 OUT4 RF 17 VCCI 16 OUT5 10 VCCO 11 OUT5 OUT6 12 OUT6 SW4 SEL4 15 SW5 SEL5 14 SW6 SEL6 13 0.1µF RF RG +5VDC 0.1µF * TO TERMINATE TRANSMISSION LINE Figure 2. MAX4136 Typical Operating Circuit Driving Capacitive Loads The MAX4135/MAX4136 provide maximum AC performance with no output load capacitance. This is the case when they are driving a correctly terminated transmission line (i.e., a back-terminated 75Ω cable). However, the MAX4135/MAX4136 are capable of driving capacitive loads up to 10pF without oscillations, but with reduced AC performance. Driving large capacitive loads increases the chance of oscillations in most amplifier circuits. This is especially true for circuits with high loop gain, such as voltage followers. The amplifier’s output resistance and the load capacitor combine to add a pole and excess phase to the loop response. If the frequency of this pole is low enough and phase margin is degraded sufficiently, oscillations may occur. A second problem when driving capacitive loads results from the amplifier’s output impedance, which looks inductive at high frequencies. This inductance forms an L-C resonant circuit with the capacitive load, which causes peaking in the frequency response and degrades the amplifier’s gain margin. The MAX4135/MAX4136 drive capacitive loads up to 10pF without oscillation. However, some peaking (in the frequency domain) or ringing (in the time domain) may occur (Figure 3). _______________________________________________________________________________________ 9 14 12 CLOSED-LOOP GAIN (dB) RISO 10 CL = 15pF CL = 10pF CL = 5pF 8 VOUT VIN RL CL 6 4 2 MAX4135 MAX4136 0 0.1M 1M 10M 100M 1G FREQUENCY (Hz) Figure 3. Effect of CLOAD on Frequency Response (without RISO) To drive larger-capacitance loads or to reduce ringing, add an isolation resistor between the amplifier’s output and the load, as shown in Figure 4. The value of RISO depends on the circuit’s gain and the capacitive load. Figure 5 shows the optimal isolation resistor (RISO) vs. capacitive load (CL). At the higher capacitor values, the bandwidth is dominated by the RC network, formed by RISO and CL. Power-Dissipation Considerations The MAX4135/MAX4136 can drive up to six outputs simultaneously. Quiescent power dissipation is typically 750mW and 800mW maximum, respectively, with all channels enabled. The maximum package power dissipation is rated at 1540mW. In a typical application, six outputs drive a standard video signal into a 150Ω load. The amount of power added to the quiescent dissipation is minimal and no special precautions are necessary. However, each output driving the maximum 65mA into 30Ω will cause a power-dissipation increase of approximately 200mW. Therefore, you should not allow more than three outputs to deliver that load simultaneously. Similarly, one output shorted to ground will cause a power-dissipation increase of 650mW. Only one output can be shorted to ground without violating the package power rating. 10 Figure 4. Capacitive-Load Driving Circuit 16 15 RISOLATION (Ω) MAX4135/MAX4136 1-Input/6-Output Video Distribution Amplifiers 14 13 12 11 10 10 40 70 100 130 160 190 220 CLOAD (pF) Figure 5. Optimal Isolation Resistor (RISO) vs. CLOAD In conclusion, during normal operation in a matchedload environment, the total power dissipation is well within the package’s dissipation rating. The maximum power dissipation is violated only if multiple channels are driving the maximum current into minimum loads at the same time. ______________________________________________________________________________________ 1-Input/6-Output Video Distribution Amplifiers MAX4135/MAX4136 SC1M3 SC1M2 SC1M1 SEL1 OUT1 OUT2 SEL2 CAMERA 1 SUBCARRIER (SC1) SEL3 OUT3 SEL4 OUT4 IN OUT5 75Ω SEL5 75Ω OUT6 VIDEO SEL6 SC1M6 SC1M5 SC1M4 MAX4135 MAX4136 SYNC 75Ω 75Ω MONITOR 1 75Ω VIDEO SC2M3 SC2M2 SC2M1 SYNC SEL1 OUT1 75Ω 75Ω MONITOR 2 OUT2 SEL2 CAMERA 2 SUBCARRIER (SC2) 75Ω SEL3 OUT3 SEL4 OUT4 IN VIDEO OUT5 75Ω SEL5 SYNC 75Ω 75Ω MONITOR 3 OUT6 MONITOR INPUTS SEL6 SC2M6 SC2M5 SC2M4 75Ω MAX4135 MAX4136 VIDEO 75Ω M3 M2 M1 75Ω MONITOR 4 VIDEO OUT1 75Ω OUT2 75Ω SYNC 75Ω OUT3 75Ω 75Ω MONITOR 5 SEL3 SEL4 OUT4 75Ω OUT5 75Ω OUT6 75Ω SEL2 IN 75Ω SEL5 SEL6 M6 M5 M4 75Ω 75Ω SEL1 COMPOSITE SYNC (FROM GENLOCK) SYNC VIDEO SYNC 75Ω 75Ω MONITOR 6 MAX4135 MAX4136 Figure 6. Two Cameras to Six Monitors Distribution Amplifier ______________________________________________________________________________________ 11 ___________________Chip Information TRANSISTOR COUNT: 901 SUBSTRATE CONNECTED TO VEE 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.) SOICW.EPS MAX4135/MAX4136 1-Input/6-Output Video Distribution Amplifiers 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. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.