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MAX4547CSE

MAX4547CSE

  • 厂商:

    AD(亚德诺)

  • 封装:

    SOIC16

  • 描述:

    IC SW BIDIRECT RF VIDEO 16-SOIC

  • 数据手册
  • 价格&库存
MAX4547CSE 数据手册
Evaluation Kit Available Design Resources Tools and Models Support Click here to ask an associate for production status of specific part numbers. MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches General Description Features The MAX4545/MAX4546/MAX4547 are low-voltage T-switches designed for switching RF and video signals from DC to 300MHz in 50Ω and 75Ω systems. The MAX4545 contains four normally open single-pole/single-throw (SPST) switches. The MAX4546 contains two dual SPST switches (one normally open, one normally closed.) The MAX4547 contains two single-pole/double-throw (SPDT) switches. Each switch is constructed in a “T” configuration, ensuring excellent high-frequency off isolation and crosstalk of -80dB at 10MHz. They can handle Rail-to-Rail analog signals in either direction. On-resistance (20Ω max) is matched between switches to 1Ω max and is flat (0.5Ω max) over the specified signal range, using ±5V supplies. The off leakage current is less than 5nA at +25°C and 50nA at +85°C. These CMOS switches can operate with dual power supplies ranging from ±2.7V to ±6V or a single supply between +2.7V and +12V. All digital inputs have 0.8V/2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility when using ±5V or a single +5V supply. ● ● ● ● ● ● ● ● ● ● ● ● ● Ordering Information Applications ● ● ● ● ● ● Low 50Ω Insertion Loss: -1dB at 100MHz High 50Ω Off Isolation: -80dB at 10MHz Low 50Ω Crosstalk: -80dB at 10MHz DC to 300MHz -3dB Signal Bandwidth 20Ω Signal Paths with ±5V Supplies 1Ω Signal-Path Matching with ±5V Supplies 0.5Ω Signal-Path Flatness with ±5V Supplies ±2.7V to ±6V Dual Supplies +2.7V to +12V Single Supply Low Power Consumption: 2kV ESD Protection per Method 3015.7 TTL/CMOS-Compatible Inputs with Single +5V or ±5V PART RF Switching Video Signal Routing High-Speed Data Acquisition Test Equipment ATE Equipment Networking TEMP. RANGE PIN-PACKAGE MAX4545CPP 0°C to +70°C 20 Plastic DIP MAX4545CWP 0°C to +70°C 20 Wide SO Ordering Information continued at end of data sheet. Pin Configurations/Functional Diagrams/Truth Tables TOP VIEW IN1 1 20 IN2 COM1 2 19 COM2 GND1 3 18 GND2 N01 4 MAX4546 IN1 1 17 NO2 V- 5 MAX4545 GND5 6 N04 7 16 V+ 15 GND6 GND4 8 13 GND3 COM4 9 12 COM3 IN4 10 16 IN2 IN1 1 16 N02 COM1 2 15 COM2 N01 2 15 V+ GND1 3 14 GND2 V- 3 14 GND2 13 NO2 GND1 4 13 COM2 12 V+ COM1 5 12 GND3 11 NC3 GND4 6 11 V- N01 4 14 N03 V- 5 NC4 6 11 IN3 GND4 7 10 GND3 V+ 7 COM4 8 9 COM3 NC1 8 DIP/SO/SSOP DIP/SO/QSOP MAX4545 LOGIC SWITCH SWITCHES SHOWN FOR LOGIC “0” INPUT 0 1 MAX4547 OFF ON 10 NC2 9 IN2 DIP/SO/QSOP MAX4547 LOGIC MAX4546 1, 2 3, 4 LOGIC NO-COM NC-COM 0 1 OFF ON ON OFF 0 1 OFF ON ON OFF 19-1232; Rev 1; 2/21 ©  2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2021 Analog Devices, Inc. All rights reserved. MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Absolute Maximum Ratings (Voltages Referenced to GND) V+........................................................................... -0.3V, +13.0V V- ............................................................................ -13.0V, +0.3V V+ to V-.................................................................. -0.3V, +13.0V All Other Pins (Note 1).........................(V- - 0.3V) to (V+ + 0.3V) Continuous Current into Any Terminal...............................±25mA Peak Current into Any Terminal (pulsed at 1ms, 10% duty cycle)...................................±50mA ESD per Method 3015.7...................................................>2000V Continuous Power Dissipation (TA = +70°C) (Note 2) 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...........................842mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C).............................696mW 16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW 20-Pin Plastic DIP (derate 8.0mW/°C above +70°C)..... 640mW 20-Pin Wide SO (derate 10.00mW/°C above +70°C).... 800mW 20-Pin SSOP (derate 8.0mW/°C above +70°C)...........640mW Operating Temperature Ranges MAX454_C_ E.....................................................0°C to +70°C MAX454_E_ E................................................. -40°C to +85°C Storage Temperature Range............................. -65°C to +150°C Lead Temperature (soldering, 10s).................................. +300°C Note 1: Voltages on all other pins exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum current rating. 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—Dual Supplies (V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, VINL = 0.8V, VINH = 2.4V, VGND_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS TA MIN C, E V- TYP (Note 2) MAX UNITS V+ V ANALOG SWITCH Analog Signal Range Signal-Path On-Resistance VCOM_, VNO_,VNC_ R ON (Note 3) V+ = 4.5V, V- = -4.5V, VCOM_ = ±2V, ICOM_ = 10mA +25°C 14 20 C, E 18 25 +25°C 0.5 1 Signal-Path On-Resistance Match Between Channels (Note 4) ΔRON Signal-Path On-Resistance Flatness (Note 5) RFLAT(ON) V+ = 5V; V- = -5V; VCOM_ = 1V, 0V, -1V; ICOM = 10mA NO_, NC_ Off Leakage Current (Note 6) INO_(OFF), INC_(OFF) V+ = 5.5V, V- = -5.5V, VCOM_ = ±4.5V, VN_ = ±4.5V +25°C -5 C, E -50 COM_ Off Leakage Current (Note 6) ICOM_(OFF) V+ = 5.5V, V- = -5.5V, VCOM_ = ±4.5V, VN_ = ±4.5V +25°C -5 C, E -50 COM_ On Leakage Current (Note 6) ICOM_(ON) V+ = 5.5V, V- = -5.5V, VCOM_ = ±4.5V, VN_ = ±4.5V +25°C -10 C, E -100 LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low www.analog.com V+ = 4.5V, V- = -4.5V, VCOM_ = ±2V, ICOM_ = 10mA VIN_H 1.25 +25°C 0.3 C, E VIN_L IINH_, IINL_ C, E VIN_ = 0.8V or 2.4V 0.02 0.5 5 50 0.02 5 50 0.04 10 100 1.5 C, E 0.8 1.5 C, E -1 0.03 2.4 Ω Ω Ω nA nA nA V V 1 µA Analog Devices │  2 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Electrical Characteristics—Dual Supplies (continued) (V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, VINL = 0.8V, VINH = 2.4V, VGND_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS TA MIN TYP (Note 2) MAX UNITS SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON VCOM_ = ±3V, V+ = 5V, V- = -5V, Figure 4 +25°C Turn-Off Time tOFF VCOM_ = ±3V, V+ = 5V, V- = -5V, Figure 4 +25°C Break-Before-Make Time Delay (MAX4546/MAX4547 only) tBBM VCOM_ = ±3V, V+ = 5V, V- = -5V, Figure 5 (Note 3) +25°C Q CL = 1.0nF, VNO_ = 0V, RS = 0Ω, Figure 6 +25°C 60 CN_(OFF) VNO_ = GND, f = 1MHz, Figure 8 +25°C 6 +25°C Charge Injection (Note 3) NO_, NC_ Off Capacitance COM_ Off Capacitance CCOM_(OFF) VCOM_ = 0V, f = 1MHz, Figure 8 COM_ On Capacitance CCOM_(ON) VCOM_ = VNO_ = 0V, f = 1MHz, Figure 8 MAX4545 VISO RL = 50Ω, VCOM_ = 1VRMS, f = 10MHz, Figure 7 MAX4545 Off Isolation (Note 7) MAX4545 MAX4546 90 C, E 200 35 C, E 15 40 ns ns ns 150 pC pF 6 pF 6 11.5 +25°C 11.5 MAX4547 MAX4546 100 120 MAX4545 MAX4546 150 pF 17 -80 +25°C -80 MAX4547 dB -82 -88 Channel-to-Channel Crosstalk (Note 8) VCT RL = 50Ω, VCOM_ = 1VRMS, f = 10MHz, Figure 7 -3dB Bandwidth BW Figure 7, RL = 50Ω +25°C 300 MHz VIN = 5VP-P, f < 20kHz, 600Ω in and out +25°C 0.004 % Distortion THD+N MAX4546 +25°C -80 MAX4547 dB -84 POWER SUPPLY Power-Supply Range V+, V- V+ Supply Current I+ V+ = 5.5V, all VIN_ = 0V or V+ V - Supply Current I- V- = -5.5V www.analog.com C, E -6 +25°C -1 C, E -10 +25°C -1 C, E -10 +6 0.05 1 10 0.05 1 V µA µA 10 Analog Devices │  3 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Electrical Characteristics—Single +5V Supply (V+ = +4.5V to +5.5V, V- = 0V, VINL = 0.8V, VINH = 2.4V, VGND_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS TA MIN (Note 3) +25°C 0 TYP (Note 2) MAX UNITS V+ V ANALOG SWITCH Analog Signal Range VCOM_, VNO_, VNC_ Signal-Path On-Resistance RON V+ = 4.5V, VCOM_ = 3.5V, ICOM_ = 1mA +25°C C, E 26 60 Signal-Path On-Resistance Match ΔRON V+ = 4.5V, VCOM_ = 3.5V, ICOM_ = 1mA +25°C 2 C, E 4 NO_, NC_ Off Leakage Current (Note 9) INO_(OFF), INC_(OFF) V+ = 5.5V, VCOM_ = 1V, VN_ = 4.5V +25°C -5 C, E -50 COM_ Off Leakage Current (Note 9) ICOM_(OFF) V+ = 5.5V, VCOM_ = 1V, VN_ = 4.5V +25°C -5 C, E -50 COM_ On Leakage Current (Note 9) ICOM_(ON) V+ = 5.5V; VCOM_ = 1V, 4.5V +25°C -10 C, E -100 LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low VIN_H C, E VIN_L IINH_, IINL_ VIN_ = 0.8V or 2.4V 0.02 40 5 50 0.02 5 50 0.04 10 100 1.5 2.4 C, E 0.8 1.5 C, E -1 0.03 1 130 250 Ω Ω nA nA nA V V µA SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON VCOM_ = 3V, V+ = 5V, Figure 4 +25°C Turn-Off Time tOFF VCOM_ = 3V, V+ = 5V, Figure 4 +25°C Break-Before-Make Time Delay (MAX4546/MAX4547 only) tBBM VCOM_ = 3V, V+ = 5V, Figure 5 (Note 3) +25°C CL = 1.0nF, VNO = 2.5V, RS = 0Ω, Figure 6 Charge Injection Q C, E 350 40 C, E 100 150 20 ns ns 70 ns +25°C 25 pC Off-Isolation (Note 7) VISO RL = 50Ω, VCOM_ = 1VRMS, f = 10MHz, Figure 7 +25°C -75 dB Channel-to-Channel Crosstalk (Note 8) VCT RL = 50Ω, VCOM_ = 1VRMS, f = 10MHz, Figure 7 +25°C -70 dB POWER SUPPLY V+ Supply Current www.analog.com I+ V+ = 5.5V, all VIN_ = 0V or V+ +25°C -1 C, E -10 0.05 1 10 µA Analog Devices │  4 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Electrical Characteristics—Single +3V Supply (V+ = +2.7V to +3.6V, V- = 0V, VINL = 0.8V, VINH = 2.4V, VGND_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS TA MIN (Note 3) +25°C 0 V+ = 2.7V, VCOM_ = 1V, ICOM_ = 1mA +25°C TYP (Note 2) MAX UNITS V+ V ANALOG SWITCH Analog Signal Range Signal-Path On-Resistance LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low VCOM_, VNO_, VNC_ RON VIN_H VIN_L IINH_, IINL_ 70 C, E 120 150 (Note 3) C, E 1.0 (Note 3) C, E 0.8 VIN_ = 0.8V or 2.4V (Note 3) C, E -1 2.4 1.0 Ω V V 1 µA SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON VCOM_ = 1.5V, V+ = 2.7V, Figure 4 (Note 3) +25°C Turn-Off Time tOFF VCOM_ = 1.5V, V+ = 2.7V, Figure 4 (Note 3) +25°C Break-Before-Make Time Delay (MAX4546/MAX4547 only) tBBM VCOM_ = 1.5V, V+ = 2.7V, Figure 5 (Note 3) 300 C, E 600 800 50 C, E 150 200 +25°C 15 100 +25°C -1 0.05 C, E -10 ns ns ns POWER SUPPLY V+ Supply Current Note Note Note Note 2: 3: 4: 5: Note Note Note Note 6: 7: 8: 9: I+ V+ = 3.6V, all VIN_ = 0V or V+ 1 10 µA The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Guaranteed by design. ΔRON = ΔRON(MAX) - ΔRON(MIN). Resistance flatness is defined as the difference between the maximum and the minimum value of on-resistance as measured over the specified analog signal range. Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C. Off isolation = 20log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to off switch. Between any two switches. Leakage testing for single-supply operation is guaranteed by testing with dual supplies. www.analog.com Analog Devices │  5 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Typical Operating Characteristics (V+ = +5V, V- = -5V, TA = +25°C, GND = 0V, packages are surface mount, unless otherwise noted.) (SINGLE SUPPLY) 100 V+ = 3.3V V+ = 7.5V -2 -1 0 1 2 3 1 2 3 4 5 6 7 8 9 TA = +25°C 20 TA = 0°C 15 TA = -55°C -3 -2 -1 MAX4545 TOC05 0.001 -75 -50 -25 0 25 50 75 MAX4545 TOC07 tON 50 100 -5 -4 -3 -2 -1 0 1 0 ±2 ±3 ±4 ±5 V+, V- (V) www.analog.com ±6 MAX4545 TOC03 2 3 4 5 VCOM (V) tON 90 POWER-SUPPLY CURRENT vs. TEMPERATURE 1 0.1 I+ I+, I- (µA) 70 60 50 40 tOFF 30 tOFF 5 SINGLE SUPPLY -20 100 125 ON/OFF TIME vs. TEMPERATURE 110 tON, tOFF (ns) tON, tOFF (ns) 100 4 40 80 150 3 DUAL SUPPLIES 60 TEMPERATURE (°C) 200 2 0 VCOM (V) ON/OFF TIME vs. SUPPLY VOLTAGE 1 80 0.01 0.0001 0 CHARGE INJECTION vs. VCOM 20 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 250 -4 100 ON/OFF LEAKAGE 0.1 -5 120 MAX4545 TOC08 25 5 10 Qj (pC) TA = +85°C TA = -55°C VCOM (V) 1 LEAKAGE (nA) RON (Ω) 0 10 MAX4545 TOC04 TA = +125°C 0 10 5 ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE 45 10 4 ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) 30 TA = 0°C 7 V+ = 10V VCOM (V) 35 TA = +25°C 13 11 VCOM (V) 40 15 MAX4545 TOC06 -3 TA = +85°C 17 9 V+, V- = 5V, -5V -4 MAX4545 TOC02 V+ = 2.7V V+, V- = 3.3V, -3.3V -5 TA = +125°C 21 19 V+ = 5V 10 23 MAX4545 TOC09 V+, V- = 2.7V, -2.7V V+ = 2V 25 RON (Ω) V+, V- = 2V, -2V V- = 0V RON (Ω) RON (Ω) V+, V- = 1.2V, -1.2V 1000 MAX4545 TOC01 100 ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) ON-RESISTANCE vs. VCOM ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) 0.01 I- 0.001 0.0001 20 ±8 10 -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) 0.00001 -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) Analog Devices │  6 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Typical Operating Characteristics (continued) (V+ = +5V, V- = -5V, TA = +25°C, GND = 0V, packages are surface mount, unless otherwise noted.) 1.0 0.8 0.6 0.2 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -110 -120 FREQUENCY RESPONSE MAX4545 TOC13 ON LOSS 0.1 1 SWITCH LOSS (dB) 60 -20 40 -30 20 ON PHASE -40 0 -50 -20 -60 -40 OFF ISOLATION -70 -60 -80 -100 www.analog.com -80 CROSSTALK -90 1 1000 10 100 FREQUENCY (MHz) 1000 OFF ISOLATION -60 CROSSTALK -100 -100 1 10 100 FREQUENCY (MHz) 1000 MAX4547 TOTAL HARMONIC DISTORTION vs. FREQUENCY 100 80 -10 -50 -80 10 100 FREQUENCY (MHz) 100 V+ = +5V V- = -5V 5Vp-p SIGNAL 600Ω SOURCE AND LOAD 10 ON PHASE (DEGREES) 0 -40 -90 V+ (V) 10 INSERTION LOSS -70 CROSSTALK 1 THD (%) 0 OFF ISOLATION -80 -90 -100 0.4 V+ = +5V V- = -5V 5VΩ INPUT 50 Ω OUTPUT -20 -30 -50 -60 -70 -10 MAX14545 TOC14 1.2 MAX4546 FREQUENCY RESPONSE 0 MAX14545 TOC11 1.4 V+ = +5V V- = -5V INSERTION LOSS 5VΩ INPUT 50Ω OUTPUT -10 -20 -30 -40 LOSS (dB) MAX4545 TOC10 0 LOSS (dB) LOGIC-LEVEL THRESHOLD (V) 1.6 MAX4545 FREQUENCY RESPONSE MAX4545 TOC12 LOGIC-LEVEL THRESHOLD vs. POSITIVE SUPPLY VOLTAGE 0.1 0.01 0.001 0.0001 10 100 1k 10k FREQUENCY (Hz) 100k Analog Devices │  7 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Pin Description PIN NAME FUNCTION* MAX4545 MAX4546 MAX4547 1, 10, 11, 20 1, 16 1, 9 IN_ 3, 6, 8, 13, 15, 18 3, 7, 10, 14 4, 6, 12, 14 GND_ 16 12 7, 15 V+ Positive Supply-Voltage Input (analog and digital) 5 5 3, 11 V- Negative Supply-Voltage Input. Connect to ground plane for single-supply operation. 4, 7, 14, 17 4, 13 2, 16 NO_ Analog Switch Normally Open** Terminals — 6, 11 8, 10 NC_ Analog Switch Normally Closed** Terminals 2, 9, 12, 19 2, 8, 9, 15 5, 13 COM_ Digital Control Input RF and Logic Ground. Grounds are not internally connected to each other, and should all be connected to a ground plane (see Grounding section). Analog Switch Common** Terminals * All pins have ESD diodes to V- and V+. ** NO_ (or NC_) and COM_ pins are identical and interchangeable. Either may be considered as an input or output; signals pass equally well in either direction. Theory of Operation Logic-Level Translators The MAX4545/MAX4546/MAX4547 are constructed as high-frequency “T” switches, as shown in Figure 1. The logic-level input, IN_, is translated by amplifier A1 into a V+ to V- logic signal that drives amplifier A2. (Amplifier A2 is an inverter for normally closed switches.) Amplifier A2 drives the gates of N-channel MOSFETs N1 and N2 from V+ to V-, turning them fully on or off. The same signal drives inverter A3 (which drives the P-channel MOSFETs P1 and P2) from V+ to V-, turning them fully on or off, and drives the N-channel MOSFET N3 off and on. The logic-level threshold is determined by V+ and GND_. The voltage on GND_ is usually at ground potential, but it may be set to any voltage between (V+ - 2V) and V-. When the voltage between V+ and GND_ is less than 2V, the level translators become very slow and unreliable. Since individual switches in each package have individual GND_ pins, they may be set to different voltages. Normally, however, they should all be connected to the ground plane. Switch On Condition When the switch is on, MOSFETs N1, N2, P1, and P2 are on and MOSFET N3 is off. The signal path is COM_ to NO_, and because both N-channel and P-channel MOSFETs act as pure resistances, it is symmetrical www.analog.com NORMALLY OPEN SWITCH CONSTRUCTION COM_ D IN_ COM_ - NO_ 0 1 OFF ON N1 D S S P1 V+ IN_ A1 A2 S D N2 P2 S NO_ D D A3 N3 S GND_ V+ VA1 (NC) BSD DIODES ON GND_, IN_, COM_, NO_, AND NC_ V+ Figure 1. T-Switch Construction (i.e., signals may pass in either direction). The off MOSFET, N3, has no DC conduction, but has a small amount of capacitance to GND_. The four on MOSFETs also have capacitance to ground that, together with the series resistance, forms a lowpass filter. All of these capacitances are distributed evenly along the series resistance, so they act as a transmission line rather than a simple R-C filter. This helps to explain the exceptional 300MHz bandwidth when the switches are on. Analog Devices │  8 MAX4545/MAX4546/ MAX4547 Typical attenuation in 50Ω systems is -1dB and is reasonably flat up to 100MHz. Higher-impedance circuits show even lower attenuation (and vice versa), but slightly lower bandwidth due to the increased effect of the internal and external capacitance and the switch’s internal resistance. The MAX4545/MAX4546/MAX4547 are optimized for ±5V operation. Using lower supply voltages or a single supply increases switching time, increases on-resistance (and therefore on-state attenuation), and increases nonlinearity. Switch Off Condition When the switch is off, MOSFETs N1, N2, P1, and P2 are off and MOSFET N3 is on. The signal path is through the off-capacitances of the series MOSFETs, but it is shunted to ground by N3. This forms a highpass filter whose exact characteristics are dependent on the source and load impedances. In 50Ω systems, and below 10MHz, the attenuation can exceed 80dB. This value decreases with increasing frequency and increasing circuit impedances. External capacitance and board layout have a major role in determining overall performance. Applications Information Power-Supply Considerations Overview The MAX4545/MAX4546/MAX4547 construction is typical of most CMOS analog switches. It has three supply pins: V+, V-, and GND. V+ and V- are used to drive the internal CMOS switches and set the limits of the analog voltage on any switch. Reverse ESD protection diodes are internally connected between each analog signal pin and both V+ and V-. If the voltage on any pin exceeds V+ or V-, one of these diodes will conduct. During normal operation these reverse-biased ESD diodes leak, forming the only current drawn from V-. Virtually all the analog leakage current is through the ESD diodes. Although the ESD diodes on a given signal pin are identical, and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or V- and the analog signal. This means their leakages vary as the signal varies. The difference in the two diode leakages from the signal path to the V+ and V- pins constitutes the analog signal-path leakage current. All analog leakage current flows to the supply terminals, not to the other switch terminal. This explains how both sides of a given switch can show leakage currents of either the same or opposite polarity. There is no connection between the analog signal paths and GND. The analog signal paths consist of an www.analog.com Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches N-channel and P-channel MOSFET with their sources and drains paralleled and their gates driven out of phase with V+ and V- by the logic-level translators. V+ and GND power the internal logic and logic-level translators, and set the input logic thresholds. The logic-level translators convert the logic levels to switched V+ and V- signals to drive the gates of the analog switches. This drive signal is the only connection between the logic supplies and the analog supplies. All pins have ESD protection to V+ and to V-. Increasing V- has no effect on the logic-level thresholds, but it does increase the drive to the P-channel switches, reducing their on-resistance. V- also sets the negative limit of the analog signal voltage. The logic-level thresholds are CMOS- and TTL-compatible when V+ is +5V. As V+ is raised, the threshold increases slightly; when V+ reaches +12V, the level threshold is about 3.1V, which is above the TTL output high-level minimum of 2.8V, but still compatible with CMOS outputs. Bipolar-Supply Operation The MAX4545/MAX4546/MAX4547 operate with bipolar supplies between ±2.7V and ±6V. The V+ and V- supplies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 13.0V. Do not connect the MAX4545/MAX4546/MAX4547 V+ pin to +3V and connect the logic-level input pins to TTL logic-level signals. TTL logic-level outputs can exceed the absolute maximum ratings, causing damage to the part and/or external circuits. CAUTION: The absolute maximum V+ to V- differential voltage is 13.0V. Typical “±6-Volt” or “12-Volt” supplies with ±10% tolerances can be as high as 13.2V. This voltage can damage the MAX4545/MAX4546/ MAX4547. Even ±5% tolerance supplies may have overshoot or noise spikes that exceed 13.0V. Single-Supply Operation The MAX4545/MAX4546/MAX4547 operate from a single supply between +2.7V and +12V when V- is connected to GND. All of the bipolar precautions must be observed. Note, however, that these parts are optimized for ±5V operation, and most AC and DC characteristics are degraded significantly when departing from ±5V. As the overall supply voltage (V+ to V-) is lowered, switching speed, on-resistance, off isolation, and distortion are degraded. (See Typical Operating Characteristics.) Analog Devices │  9 MAX4545/MAX4546/ MAX4547 Single-supply operation also limits signal levels and interferes with grounded signals. When V- = 0V, AC signals are limited to -0.3V. Voltages below -0.3V can be clipped by the internal ESD-protection diodes, and the parts can be damaged if excessive current flows. Power Off When power to the MAX4545/MAX4546/MAX4547 is off (i.e., V+ = 0V and V- = 0V), the Absolute Maximum Ratings still apply. This means that neither logic-level inputs on IN_ nor signals on COM_, NO_, or NC_ can exceed ±0.3V. Voltages beyond ±0.3V cause the internal ESD-protection diodes to conduct, and the parts can be damaged if excessive current flows. Grounding DC Ground Considerations Satisfactory high-frequency operation requires that careful consideration be given to grounding. For most applications, a ground plane is strongly recommended, and all GND_ pins should be connected to it with solid copper. While the V+ and V- power-supply pins are common to all switches in a given package, each switch has separate ground pins that are not internally connected to each other. This contributes to the overall high-frequency performance and provides added flexibility in some applications, but it can cause problems if it is overlooked. All the GND_ pins have ESD diodes to V+ and V-. In systems that have separate digital and analog (signal) grounds, connect these switch GND_ pins to analog ground. Preserving a good signal ground is much more important than preserving a digital ground. Ground current is only a few nanoamps. The logic-level inputs, IN_, have voltage thresholds determined by V+ and GND_. (V- does not influence the logic-level threshold.) With +5V and 0V applied to V+ and GND_, the threshold is about 1.6V, ensuring compatibility with TTL- and CMOS-logic drivers. The various GND_ pins can be connected to separate voltage potentials if any or all of the logic-level inputs is not a normal logic signal. (The GND_ voltages cannot exceed (V+ - 2V) or V-.) Elevating GND_ reduces off isolation. For example, using the MAX4545, if GND2–GND6 are connected to 0V and GND1 is connected to V-, then switches 2, 3, and 4 would be TTL/CMOS compatible, but switch 1 (IN1) could be driven with the rail-to-rail output of an op amp operating from V+ and V-. Note, however, that IN_ can be driven more negative than GND_, as far as V-. GND_ does not have to be removed from 0V when IN_ is driven from bipolar sources, but the voltage on IN_ www.analog.com Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches should never exceed V-. GND_ should be separated from 0V only if the logic-level threshold has to be changed. Any GND_ pin not connected to 0V should be bypassed to the ground plane with a surface-mount 10nF capacitor to maintain good RF grounding. DC current in the IN_ and GND_ pins is less than 1nA, but increases with switching frequency. On the MAX4545 only, two extra ground pins—GND5 and GND6—are provided to improve isolation and crosstalk. They are not connected to the logic-level circuit. These pins should always be connected to the ground plane with solid copper. AC Ground and Bypassing A ground plane is mandatory for satisfactory highfrequency operation. (Prototyping using hand wiring or wire-wrap boards is strongly discouraged.) Connect all 0V GND_ pins to the ground plane with solid copper. (The GND_ pins extend the high-frequency ground through the package wire-frame, into the silicon itself, thus improving isolation.) The ground plane should be solid metal underneath the device, without interruptions. There should be no traces under the device itself. For DIP packages, this applies to both sides of a two-sided board. Failure to observe this will have a minimal effect on the “on” characteristics of the switch at high frequencies, but it will degrade the off isolation and crosstalk. All V+ and V- pins should be bypassed to the ground plane with surface-mount 10nF capacitors. For DIP packages, they should be mounted as close as possible to the pins on the same side of the board as the device. Do not use feedthroughs or vias for bypass capacitors. For surface-mount packages, the pins are so close to each other that the bypass capacitors should be mounted on the opposite side of the board from the device. In this case, use short feedthroughs or vias, directly under the V+ and V- pins. Any GND_ pin not connected to 0V should be similarly bypassed. If Vis 0V, connect it directly to the ground plane with solid copper. Keep all leads short. The MAX4547 has two V+ and V- pins. Make DC connections to only one of each to minimize crosstalk. Do not route DC current into one of the V+ or V- pins and out the other V+ or V- pin to other devices. The second set of V+ and V- pins is for AC bypassing only. For dual-supply operation, the MAX4547 should have four 10nF bypass capacitors connected to each V+ and V- pin, as close to the package as possible. For single-supply operation, the MAX4547 should have two 10nF bypass capacitors connected (one to each V+ pin), as close to the package as possible. Analog Devices │  10 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Board Layout V+ 82Ω (194Ω) 10nF 12 LOGIC IN V+ 1 IN1 IN2 16 2 COM1 50Ω IN/OUT 3 GND1 COM2 15 MAX4546 4 NO1 6 NC4 7 GND2 14 NO2 13 NC3 11 GND3 GND4 50Ω OUT/IN 10 COM3 9 8 COM4 V38Ω (61Ω) 38Ω (61Ω) 5 10nF V- LOGIC SWITCH 0 OFF 1 ON SWITCHES SHOWN FOR LOGIC “0” INPUT ( ) ARE FOR 75 SYSTEMS. Figure 2. Impedance Matching On/Off Switch On the MAX4545, GND5 and GND6 should always be connected to the ground plane with solid copper to improve isolation and crosstalk. Signal Routing Keep all signal leads as short as possible. Separate all signal leads from each other and other traces with the ground plane on both sides of the board. Where possible, use coaxial cable instead of printed circuit board traces. www.analog.com IC sockets degrade high-frequency performance and should not be used if signal bandwidth exceeds 5MHz. Surface-mount parts, having shorter internal lead frames, provide the best high-frequency performance. Keep all bypass capacitors close to the device, and separate all signal leads with ground planes. Such grounds tend to be wedge-shaped as they get closer to the device. Use vias to connect the ground planes on each side of the board, and place the vias in the apex of the wedge-shaped grounds that separate signal leads. Logic-level signal lead placement is not critical. Impedance Matching The typical on-resistances of the switches in the MAX4545/ MAX4546/MAX4547 are 14Ω, but the off state impedances are approximately equal to a 6pF capacitor. In coaxial systems, therefore, it is impossible to match any impedance for both the on and off state. If impedance matching is critical, the MAX4546 is best suited, since its two sections can be configured as a single on/off switch, as shown in Figure 2. This circuit “wastes” switches and has higher losses, but has better off isolation and maintains good impedance matching in both the on and off states. The resistance values shown in Figure 3 are optimized with ±5V supplies for both 50Ω and 75Ω systems at room temperature. Multiplexer With its excellent off isolation, the MAX4545 is ideal for use in high-frequency video multiplexers. Figure 3 shows such an application for switching any one of four video inputs to a single output. The same circuit may be used as a demultiplexer by simply reversing the signal direction. Stray capacitance of traces and the output capacitance of switches placed in parallel reduces bandwidth, so the outputs of no more than four individual switches should be placed in parallel if high bandwidth is to be maintained. If more than four mux channels are needed, the 4-channel circuit should be duplicated and cascaded. Analog Devices │  11 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches 10nF 1 1 2 2 3 3 4 V+ GND5 OUT GND6 MAX4545 V+ MAX4545 COM1 1 4 2 3 MAX4545 NO1 GND1 OUT 50/75Ω OUT/IN COM2 NO2 GND2 COM3 4 NO3 GND3 ADDRESS DECODING COM4 NO4 GND4 6 2 3 7 8 IN1 OUT 1 5 50/75Ω OUT/IN MAX4545 4 TO ADDITIONAL MUXES IN2 IN3 IN4 IN1 IN2 IN3 IN4 V10nF VMORE THAN 4 CHANNELS 2 TO 4 CHANNELS Figure 3. 4-Channel Multiplexer www.analog.com Analog Devices │  12 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Test Circuits/Timing Diagrams 10nF +5V V+ NO_OR NC_ VIN_ 3V V+ 50% 50% 0V MAX4545 MAX4546 MAX4547 VIN_ IN_ 90% COM_ V- GND_ 50Ω VOUT VOUT 90% 0V RL = 50Ω tON tOFF 10nF -5V ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV). V- IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. REPEAT TEST FOR EACH SWITCH. Figure 4. Switching Time 10nF +5V V+ * COM3 3V * COM2 MAX4546 * N02 VIN_ IN_ GND_ V- VOUT * NC3 RL = 50Ω 50Ω 10nF VIN_ V+ tR < 20ns tF < 20ns 50% 0V -5V 80% * REPEAT TEST FOR OTHER PAIR OF SWITCHES. VOUT 10nF -+5V 0V V+ **NC_ MAX4547 VIN_ IN_ GND_ ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV). V+ IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. **NO_ **COM_ V- 50Ω 10nF tBBM 1V VOUT RL = 50Ω -5V ** REPEAT TEST FOR OTHER SWITCH. Figure 5. Break-Before-Make Interval (MAX4546/MAX4547 only) www.analog.com Analog Devices │  13 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Test Circuits/Timing Diagrams (continued) 10nF +5V V+ NO_ OR NC_ V+ VIN_ VNO = 0V 0V MAX4545 MAX4546 MAX4547 VIN_ IN_ COM_ GND_ V- ∆VOUT VOUT VOUT CL = 1000pF 50Ω 10nF ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. -5V Q = ∆VOUT x CL V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 6. Charge Injection +5V 10nF 0V OR V+ V+ IN_ NO_ MAX4545 MAX4546 MAX4547 COM_ GND_ V- 50Ω VIN NETWORK ANALYZER OFF-ISOLATION = 20log 50Ω ON-LOSS = 20log CROSSTALK = 20log VOUT MEAS 50Ω REF VOUT VIN VOUT VIN VOUT VIN 50Ω 10nF -5V MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 7. On Loss, Off Isolation, and Crosstalk www.analog.com Analog Devices │  14 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Test Circuits/Timing Diagrams (continued) Chip Topographies MAX4545 COM1 10nF +5V IN1 IN2 COM2 GND2 N.C. 0.101" (2.565mm) GND1 0V OR V+ V+ IN_ NO2 NO_ GND6 V- 1MHz CAPACITANCE ANALYZER COM_ GND_ V+ NO1 MAX4545 NC_ MAX4546 MAX4547 V- GND5 NO3 NO4 GND3 N.C. GND4 10nF -5V ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (0V). COM4 MAX4546 IN1 IN2 COM3 0.085" (2.159mm) Figure 8. NO_, NC_, COM_ Capacitance COM1 IN4 IN3 MAX4547 COM2 NO1 GND2 0.101" (2.565mm) N.C. GND1 IN1 IN2 V+ GND2 0.101" (2.565mm) VGND1 NO2 V+ NO1 N.C. VN.C. NC3 NC4 N.C. N.C. N.C. N.C. COM2 COM1 N.C. N.C. GND3 N.C. N.C. GND4 COM4 COM3 0.085" (2.159mm) N.C. = NO INTERNAL CONNECTION www.analog.com GND3 V- GND4 V+ NC1 IN2 NC2 0.085" (2.159mm) TRANSISTOR COUNT: 253 SUBSTRATE INTERNALLY CONNECTED TO V- Analog Devices │  15 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Ordering Information (continued) PART TEMP. RANGE PIN-PACKAGE PART TEMP. RANGE PIN-PACKAGE MAX4545CAP 0°C to +70°C 20 SSOP MAX4546C/D 0°C to +70°C MAX4545C/D 0°C to +70°C Dice* MAX4546EEE -40°C to +85°C Dice* 16 QSOP MAX4545CWP+ 0°C to +70°C 20 Wide SO MAX4546EPE -40°C to +85°C 16 Plastic DIP MAX4545CWP+T 0°C to +70°C 20 Wide SO MAX4546ESE -40°C to +85°C 16 Narrow SO -40°C to +85°C 16 Narrow SO MAX4545EAP -40°C to +85°C 20 SSOP MAX4546ESE+T MAX4545EPP -40°C to +85°C 20 Plastic DIP MAX4547CPE 0°C to +70°C 16 Plastic DIP MAX4545EWP -40°C to +85°C 20 Wide SO MAX4547CSE 0°C to +70°C 16 Narrow SO MAX4545EWP+ -40°C to +85°C 20 Wide SO MAX4547CEE 0°C to +70°C 16 QSOP MAX4545EWP+T -40°C to +85°C 20 Wide SO MAX4547C/D 0°C to +70°C Dice* MAX4546CPE 0°C to +70°C 16 Plastic DIP MAX4547EEE -40°C to +85°C 16 QSOP MAX4546CSE 0°C to +70°C 16 Narrow SO MAX4547EPE -40°C to +85°C 16 Plastic DIP MAX4546CEE 0°C to +70°C 16 QSOP MAX4547ESE -40°C to +85°C 16 Narrow SO *Contact factory for dice specifications. Package Information PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 16 SO (N) S16+5 21-0041 90-0097 16 QSOP E16+1 21-0055 90-0167 20 SSOP A20+5 21-0056 90-0094 20 SO (W) W20+2 21-0042 90-0108 20 PDIP P20+4 21-0043 — www.analog.com Analog Devices │  16 MAX4545/MAX4546/ MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 6/97 Initial Release. 1 2/21 Added new packages to Ordering Information, added Package Information and Revision History. DESCRIPTION — 1, 16 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. w w w . a n a l o g . c o m Analog Devices │  17
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