19-0400; Rev 0; 5/95 IT K ATION EVALU BLE AVAILA 330MHz, 4x1 Precision Video Multiplexer ____________________________Features ♦ 330MHz -3dB Bandwidth ♦ 0.1dB Gain Flatness of 150MHz ♦ 700V/µs Slew Rate ♦ 0.01°/0.01% Differential Phase/Gain ♦ -66dB Crosstalk and -74dB Isolation at 30MHz ♦ High-Z Outputs when Disabled ♦ 3pF Input Capacitance ♦ Low Switching Glitch ♦ On-Board Control Logic ______________Ordering Information PART TEMP. RANGE MAX4141CSD 0°C to +70°C PIN-PACKAGE 14 SO ________________________Applications Broadcast/HDTV-Quality Color Signal Multiplexing Video Routers and Crosspoint Arrays RF and IF Routing ________________Functional Diagram Graphics Color Signal Routing Telecom Routing IN0 AV = +1 Data Acquisition IN1 AV = +1 __________________Pin Configuration OUT IN2 AV = +1 TOP VIEW IN0 1 14 A0 GND 2 13 A1 IN1 3 GND 4 IN3 AV = +1 12 VCC MAX4141 IN2 5 11 OUT 10 VEE GND 6 9 EN IN3 7 8 N.C. A0 A1 CONTROL LOGIC EN SO ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 MAX4141 _______________General Description The MAX4141 is a wideband 330MHz, 700V/µs 4x1 multiplexer optimized for high-definition, broadcastquality, composite (HDTV, NTSC, PAL, SECAM) video switching arrays. The device includes four open-loop buffer amplifiers with a 0.1dB gain flatness of 150MHz, and enable and switch-control logic. The MAX4141 operates from ±5V supplies and features differential phase and gain error of only 0.01°/0.01%. The ultra-low switching glitch (less than 13mV) is positive to avoid confusion with any sync pulses. Ideal as a building block for large switch arrays, the MAX4141 features a constant, high input impedance and a disable function that puts the output into a highimpedance state and reduces the operating current to only 250µA. The open-loop architecture allows the output to drive capacitive loads without oscillation. Other key features include -66dB crosstalk (30MHz), -74dB isolation (30MHz), less than 10mV offset voltage, and a 110MHz full-power bandwidth (1.4Vp-p). The MAX4141 is available in a 14-pin narrow SO package. MAX4141 330MHz, 4x1 Precision Video Multiplexer ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................................6V VEE ..........................................................................................-6V VCC-VEE..................................................................................12V Analog Input Voltage .......................(VEE - 0.3V) to (VCC + 0.3V) Digital Input Voltage ...................................-0.3V to (VCC + 0.3V) Duration of Short Circuit to Ground..............Continuous (Note 1) Continuous Power Dissipation (TA = +70°C) SO (derate 8.00mW/°C above +70°C) ........................640mW Operating Temperature Range...............................0°C to +70°C Storage Temperature Range .............................-65°C to +160°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10sec) .............................+300°C Note 1: If maximum power-dissipation rating is met. 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. ELECTRICAL CHARACTERISTICS (VS = ±5V, -2.5V ≤ VIN ≤ +2.5V, RL = 5kΩ, CL = 5pF, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ±4.5 ±5.0 ±5.5 V 5.0 5.5 DC PARAMETERS Operating Supply Voltage VS Operating Supply Current IS(ON) Disabled Supply Current IS(OFF) Input Voltage Range Input Bias Current IB RIN Input Capacitance CIN Power-Supply Rejection Ratio Voltage Gain Output Resistance Disabled Output Current TA = TMIN to TMAX VOS PSRR AV 6.5 250 350 Channel selected ±2.5 ±4.0 Channel disabled ±0.2 VIN Input Resistance Output Offset Voltage Enabled TA = +25°C ±2.5 VIN = 0V 0.4 Channel disabled 100 ±3 TA = TMIN to TMAX VIN = ±2.5V 50 0.98 1.0 TA = TMIN to TMAX 0.97 1.0 VOUT = 0V mV dB TA = +25°C ROUT IOUT(OFF) pF ±10 ±15 VS = ±4.5V to ±5.5V µA MΩ 3 TA = +25°C µA V Channel selected VIN = 0V, channel enabled or disabled mA V/V 20 Ω 10 nA Disabled Output Resistance ROUT 30 MΩ Disabled Output Capacitance COUT 5 pF Logic Input High Voltage VINH VS = ±4.5V to ±5.5V Logic Input Low Voltage VINL VS = ±4.5V to ±5.5V 0.8 V Logic Input High Current IINH VS = ±4.5V to ±5.5V 10 µA Logic Input Low Current IINL VS = ±4.5V to ±5.5V 10 µA 2 2.0 _______________________________________________________________________________________ V 330MHz, 4x1 Precision Video Multiplexer MAX4141 ELECTRICAL CHARACTERISTICS (continued) (VS = ±5V, -2.5V ≤ VIN ≤ +2.5V, RL = 5kΩ, CL = 5pF, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AC PARAMETERS Slew Rate SR Full-Power Bandwidth (Note 2) fPBW -3dB Bandwidth f3dB Gain Flatness VIN = 5Vp-p 700 VIN = 1.4Vp-p 500 VIN = 1.4Vp-p 110 VIN = 5Vp-p 45 VIN = 0.1Vp-p 330 DC to 30MHz 0.02 DC to 150MHz ±0.1 Gain Peaking Small-Signal Rise Time tR V/µs MHz MHz dB 0.08 dB VIN = 0.2Vp-p, 10% to 90% 950 ps Differential Gain (Note 3) DG f = 3.58MHz 0.01 % Differential Phase (Note 3) DP f = 3.58MHz 0.01 degrees All-Hostile Crosstalk VIN = 1Vp-p, f = 30MHz, RIN = 50Ω 66 dB Off Isolation VIN = 1Vp-p, f = 30MHz 74 dB µs Channel Switching Off Time tOFF 1.0 Channel Switching On Time tON 500 ns 13 mVp-p Switching Transient Group Delay f = 3.58MHz 860 ps Input-Output Delay Matching Chip-to-chip, f = 3.58MHz ±0.2 degrees Second Harmonic Distortion f = 30MHz, VIN = 1.4Vp-p, RL = 2k -65 dBc Third Harmonic Distortion f = 30MHz, VIN = 1.4Vp-p, RL = 2k -70 dBc Note 2: Note 3: Full-Power Bandwidth is inferred from Slew Rate (SR) testing by the equation SR = ωEP, where EP is the peak output voltage and ω = 2πf. Differential Gain and Phase are tested using a modulated ramp, 100IRE (0.714V). MAX4141 MAX4141 HIGH-IMPEDANCE PROBE NETWORK ANALYZER HIGH-IMPEDANCE PROBE NETWORK ANALYZER 20Ω* ALL-HOSTILE CROSSTALK TEST CIRCUIT VIN (1Vp-p) VIN (1Vp-p) * 20Ω RESISTOR USED TO SIMULATE OUTPUT RESISTOR OF AN "ON" MAX4141. IN THIS WAY, OPERATION IN AN ARRAY IS SIMULATED. OFF-ISOLATION TEST CIRCUIT _______________________________________________________________________________________ 3 __________________________________________Typical Operating Characteristics (VS = ±5V, RL = 5kΩ, CL = 1pF, TA = +25°C, unless otherwise noted.) GAIN FLATNESS 0.1 0 GAIN (dB) -6 -8 -10 -0.1 -0.2 -0.3 -12 -0.4 -14 -0.5 -16 -0.6 -0.7 -18 1 100 10 10 FREQUENCY (MHz) 0.1 VEE -50 VCC 40 20 0 -20 -40 -60 -80 20 0 -20 -40 -60 -80 -80 -120 -120 -90 -140 10M 100M -140 0.1 1 10 100 FREQUENCY (Hz) FREQUENCY (MHz) SMALL-SIGNAL PULSE RESPONSE SMALL-SIGNAL PULSE RESPONSE 0.1 VOLTS (100mV/div) 1 10 100 1000 FREQUENCY (MHz) LARGE-SIGNAL PULSE RESPONSE (CL = 0pF, RL = 5kΩ) MAX14141 TOC-09 MAX14141 TOC-07 VOLTS (100mV/div) 1000 (CL = 47pF, RL = ∞) (CL = 0pF, RL = 5kΩ) 500 40 -100 1M 100 OFF ISOLATION vs. FREQUENCY -100 100k 10 60 -70 10k 1 FREQUENCY (MHz) AMPLITUDE (dB) -30 -60 1000 MAX4141 TOC-05 60 AMPLITUDE (dB) -20 -40 100 ALL-HOSTILE CROSSTALK vs. FREQUENCY MAX4141 TOC-04 0 -10 10 FREQUENCY (MHz) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 10 20 0 1 1000 30 MAX4141 TOC-06 GAIN (dB) -4 MAX4141 TOC-03 0.2 40 MAX14141 TOC-08 0 -2 OUTPUT RESISTANCE vs. FREQUENCY MAX4141 TOC-02 MAX4141 TOC-01 0.3 OUTPUT RESISTANCE (Ω) GAIN vs. FREQUENCY 2 AMPLITUDE (dB) MAX4141 330MHz, 4x1 Precision Video Multiplexer IN (2.5V/div) GND VOLTS GND OUT (1V/div) TIME (5ns/div) 4 TIME (5ns/div) TIME (5ns/div) _______________________________________________________________________________________ 330MHz, 4x1 Precision Video Multiplexer LARGE-SIGNAL PULSE RESPONSE (CL = 47pF, RL = ∞) MAX14141 TOC-12 ENABLE ON GND AMPLITUDE IN 2.5V/div OUTPUT GLITCH AMPLITUDE MAX14141 TOC-11 MAX14141 TOC-10 ENABLE/DISABLE DELAY TIME VOLTS GND OUT (1V/div) OUTPUT 2V/div GND IN0 ON A0 2V/div 1V/div 10mV/div TIME (10ns/div) TIME (1µs/div) TIME (1µs/div) NOISE VOLTAGE vs. FREQUENCY SUPPLY CURRENT vs. TEMPERATURE GAIN vs. INPUT VOLTAGE AND TEMPERATURE 3 TA = 0°C -0.090 4.6 TA = +25°C 4.4 4.2 IEE GAIN (dB) SUPPLY CURRENT (mA) 10 MAX4141 TOC-15 4.8 30 -0.085 MAX4141 TOC-14 5.0 MAX4141 TOC-13 100 ICC 4.0 3.8 -0.095 -0.100 TA = +70°C -0.105 3.6 1 10k 1M 100M -0.110 3.4 10G 0 10 FREQUENCY (Hz) 20 30 40 50 60 -3 70 -2 -1 0 1 2 3 INPUT VOLTAGE (V) TEMPERATURE (°C) GAIN vs. LOAD RESISTANCE BANDWIDTH vs. LOAD CAPACITANCE RL = OPEN 300 0 MAX4141 TOC-17 350 -0.2 -0.4 250 GAIN (dB) 100 MAX4141 TOC-16 1 BANDWIDTH (MHz) NOISE VOLTAGE (nV √Hz) OUTPUT 200 150 -3dB BW 100 -0.6 -0.8 -1.0 -1.2 50 -1.4 -0.1dB BW -1.6 0 0 20 40 60 80 LOAD CAPACITANCE (pF) 100 0 1 2 3 4 5 RL(kΩ) _______________________________________________________________________________________ 5 MAX4141 ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) MAX4141 330MHz, 4x1 Precision Video Multiplexer ______________________________________________________________Pin Description PIN FUNCTION 1 IN0 DESCRIPTION 2, 4, 6 GND 3 IN1 Signal Input 5 IN2 Signal Input 7 IN3 Signal Input 8 N.C. No Connect—not internally connected. 9 EN Output Enable and device shutdown. A logic high on this pin enables the output. A logic low causes the output to assume a high-impedance state and reduces operating current. 10 VEE Negative Power-Supply Voltage. Decouple to power ground. 11 OUT Signal Output 12 VCC Positive Power-Supply Voltage. Decouple to power ground. 13 A1 Channel Selection Bit. See truth tables. 14 A0 Channel Selection Bit. See truth tables. Signal Input Analog (Signal) Ground. Since inputs are isolated by these grounds, they should be as noise-free as possible. _______________Detailed Description __________Applications Information The MAX4141 video switch is manufactured with Maxim’s proprietary complementary bipolar process that yields high bandwidth and low capacitance. To maintain a wide bandwidth, the MAX4141 incorporates a straightforward structure of input and output buffers. Make-before-break switching is employed to reduce noise and glitches, even when switching from part to part in large arrays. The input buffers provide a constant, high input impedance. And, they prevent the make-before-break action from feeding back to the input and causing noise and/or glitches. The design of the switching mechanism limits the inevitable glitch to within 13mVp-p. In addition, the glitch pulse is positive to avoid confusion with any negative sync pulses. Unity-gain output buffers isolate other inputs from the switching action of large multiplex arrays. These buffers can drive 5kΩ resistive loads. Load capacitance is limited only by system bandwidth requirements. The MAX4141 does not contain buffer latches. The digital inputs control the switch transparently. Grounding, Bypassing, and PC Board Layout 6 In order to obtain the MAX4141’s full 330MHz bandwidth, Microstrip and Stripline techniques are recommended in most cases. To ensure your PC board does not degrade the switch’s performance, it’s wise to design the board for a frequency greater than 1GHz. Even with very short runs, it’s good practice to use this technique 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: • Do not use wire-wrap boards, because 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, and give 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 as straight as possible. Do not make 90° turns; round all corners. • The ground plane should be as free from voids as possible. _______________________________________________________________________________________ 330MHz, 4x1 Precision Video Multiplexer Bypass Components—Capacitors Electrolytic and tantalum capacitors are available from 0.1µF to over 300µF, but have resonant frequencies below 1MHz. Ceramic capacitors are highly recommended and are available to 1µF, with the smaller values having resonant frequencies to almost 1GHz. The less expensive capacitors are constructed using a multilayer approach; high values are available, but resonant frequencies beyond a few hundred megahertz are not, because of the inductive effect of the multiple layers. More expensive, solid dielectric microwave porcelain/ceramic capacitors are available up to 1000pF with resonant frequencies beyond 20GHz. In all types, resonant frequency depends on capacitor value, voltage rating, and physical size; the larger the capacitor, the lower the resonant frequency. We recommend ceramic surface-mount/chip capacitors. Placement of bypass capacitors on the PC board is critical, and the smaller chip capacitors allow placement as close to the part as practical. The smaller, higher frequency capacitors should be placed as close to the chip as possible, with the higher-value capacitors placed farther away. Creating Large Arrays The MAX4141 was designed as a building block for large arrays. The high-power drive required for internal cable drivers has a negative effect on crosstalk and increases system power consumption. Figure 1 shows an 8x1 multiplexer circuit. Even though the MAX4141 drives capacitive loads, you may want to limit the number of switches connected together to maximize bandwidth. The MAX4141 has a finite input capacitance of about 3pF and a dynamic output resistance of about 20Ω. This causes a pole at a little more than 2.6GHz. However, in a large array with many switch inputs, the total capacitance is (N x 3pF), where “N” is the number of switches connected in parallel. The pole will be located at: 1 ( ) 2π × N × 3pF + C STRAY × 20Ω MHz where CSTRAY is the stray capacitance from the interconnect. If the maximum number of switches that may be connected while still maintaining bandwidth is less than your system requirements, use a unity-gain buffer amplifier to isolate the switch from the remainder of the inputs. Table 1. Truth Table A1 A0 EN OUT X X 0 High-Z 0 0 1 IN0 0 1 1 IN1 1 0 1 IN2 1 1 1 IN3 _______________________________________________________________________________________ 7 MAX4141 On Maxim’s evaluation kit, the ground plane has been removed from areas where keeping the trace capacitance to a minimum is more important than maintaining ground continuity. For example, the ground plane has been removed from beneath the IC to minimize pin capacitance. The signal input line is approximately 0.103 inches wide to minimize inductance and to provide a constant 50Ω impedance path. It is terminated by a 50Ω chip resistor. MAX4141 330MHz, 4x1 Precision Video Multiplexer 75Ω IN0 A0 1 14 GND A1 2 MAX4141 IN1 1000pF OUT 4 11 IN2 75Ω 10µF 13 12 GND 75Ω 10µF VCC 3 75Ω VEE VCC VEE 5 10 GND 6 EN 9 IN3 N.C. 8 7 1000pF OUT (TO CABLE DRIVER OR OTHER SWITCHES) 75Ω IN0 A0 1 14 A1 GND 2 MAX4141 VCC IN1 3 75Ω 12 1000pF OUT GND 4 11 IN2 VEE 5 75Ω 10 GND 1000pF EN 9 6 75Ω 13 IN3 N.C. 8 7 EN2 EN1 A1 A0 Figure 1. 8x1 Multiplexer Circuit 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. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.