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 19-1252; Rev 0; 7/97
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches
_______________General Description
The MAX4565/MAX4566/MAX4567 are low-voltage T-switches designed for switching RF and video signals from DC to 350MHz in 50 and 75 systems. The MAX4565 contains four normally open single-pole/singlethrow (SPST) switches. The MAX4566 contains two dual SPST switches (one normally open, one normally closed.) The MAX4567 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 -83dB at 10MHz. They can handle Rail-to-Rail(R) analog signals in either direction. On-resistance (60 max) is matched between switches to 2.5 max and is flat (2 max) over the specified signal range, using 5V supplies. The off leakage current is less than 5nA at +25C and 50nA at +85C. 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.
____________________________Features
o High 50 Off Isolation: -83dB at 10MHz o Low 50 Crosstalk: -87dB at 10MHz o DC to 350MHz -3dB Signal Bandwidth o 60 Signal Paths with 5V Supplies o 2.5 Signal-Path Matching with 5V Supplies o 2 Signal-Path Flatness with 5V Supplies o Low 50 Insertion Loss: 2.5dB at 100MHz o 2.7V to 6V Dual Supplies +2.7V to +12V Single Supply o Low Power Consumption: <1W o Rail-to-Rail Bidirectional Signal Handling o Pin Compatible with Industry-Standard DG540, DG542, DG643 o >2kV ESD Protection per Method 3015.7 o TTL/CMOS-Compatible Inputs with Single +5V or 5V
MAX4565/MAX4566/MAX4567
________________________Applications
RF Switching Video Signal Routing High-Speed Data Acquisition Test Equipment ATE Equipment Networking
______________Ordering Information
PART MAX4565CPP MAX4565CWP TEMP. RANGE 0C to +70C 0C to +70C PIN-PACKAGE 20 Plastic DIP 20 Wide SO
Ordering Information continued at end of data sheet.
_____________________Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
IN1 1 COM1 2 GND1 3 N01 4 V- 5 GND5 6 N04 7 GND4 8 COM4 9 IN4 10 20 IN2 19 COM2 18 GND2 17 NO2 16 V+ IN1 1 COM1 2 GND1 3 N01 4 V- 5 NC4 6 GND4 7 COM4 8 16 IN2 15 COM2 14 GND2 13 NO2 12 V+ 11 NC3 10 GND3 9 COM3 IN1 1 N01 2 V- 3 GND1 4 COM1 5 GND4 6 V+ 7 NC1 8 16 N02 15 V+ 14 GND2 13 COM2 12 GND3 11 V10 NC2 9 IN2
MAX4566
MAX4567
MAX4565
15 GND6 14 N03 13 GND3 12 COM3 11 IN3
DIP/SO/SSOP
MAX4565 LOGIC SWITCH SWITCHES SHOWN FOR LOGIC "0" INPUT 0 1 OFF ON LOGIC 0 1
DIP/SO/QSOP
MAX4566 1, 2 OFF ON 3, 4 ON OFF LOGIC 0 1
DIP/SO/QSOP
MAX4567 NO-COM OFF ON NC-COM ON OFF
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
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 = +70C) (Note 2) 16-Pin Plastic DIP (derate 10.53mW/C above +70C) ..........................842mW 16-Pin Narrow SO (derate 8.70mW/C above +70C) ............................696mW 16-Pin QSOP (derate 8.3mW/C above +70C).......... 667mW 20-Pin Plastic DIP (derate 8.0mW/C above +70C) ...640mW 20-Pin Wide SO (derate 10.00mW/C above +70C) .. 800mW 20-Pin SSOP (derate 8.0mW/C above +70C) .......... 640mW Operating Temperature Ranges MAX456_C_ E .....................................................0C to +70C MAX456_E_ E ..................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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 = +25C.) PARAMETER ANALOG SWITCH Analog Signal Range Signal-Path On-Resistance Signal-Path On-Resistance Match Between Channels (Note 4) Signal-Path On-Resistance Flatness (Note 5) NO_, NC_ Off Leakage Current (Note 6) COM_ Off Leakage Current (Note 6) COM_ On Leakage Current (Note 6) LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low VIN_H VIN_L IINH_, IINL_ VIN_ = 0.8V or 2.4V C, E C, E C, E 0.8 -1 1.5 1.5 0.03 1 2.4 V V A VCOM_, VNO_,VNC_ RON RON RFLAT(ON) INO_(OFF), INC_(OFF) ICOM_(OFF) ICOM_(ON) (Note 3) V+ = 4.5V, V- = -4.5V, VCOM_ = 2V, ICOM_ = 10mA V+ = 4.5V, V- = -4.5V, VCOM_ = 2V, ICOM_ = 10mA V+ = 5V; V- = -5V; VCOM_ = 1V, 0V, -1V; ICOM = 10mA V+ = 5.5V, V- = -5.5V, VCOM_ = 4.5V, VN_ = 4.5V V+ = 5.5V, V- = -5.5V, VCOM_ = 4.5V, VN_ = 4.5V V+ = 5.5V, V- = -5.5V, VCOM_ = 4.5V C, E +25C C, E +25C C, E +25C +25C C, E +25C C, E +25C C, E -1 -10 -1 -10 -2 -20 0.04 0.02 0.3 0.02 1 V46 V+ 60 80 2.5 3 2 1 10 1 10 2 20 V nA nA nA SYMBOL CONDITIONS TA MIN TYP (Note 2) MAX UNITS
2
_______________________________________________________________________________________
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 = +25C.) PARAMETER SYMBOL CONDITIONS TA MIN TYP (Note 2) 75 30 MAX UNITS
MAX4565/MAX4566/MAX4567
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Time Delay (MAX4566/MAX4567 only) Charge Injection (Note 3) NO_, NC_ Off Capacitance COM_ Off Capacitance tON tOFF tBBM Q CN_(OFF) VCOM_ = 3V, V+ = 5V, V- = -5V, Figure 3 VCOM_ = 3V, V+ = 5V, V- = -5V, Figure 3 VCOM_ = 3V, V+ = 5V, V- = -5V, Figure 4 CL = 1.0nF, VNO_ = 0V, RS = 0, Figure 5 VNO_ = GND, f = 1MHz, Figure 7 MAX4565 MAX4565, MAX4566 +25C C, E +25C C, E +25C +25C +25C +25C 5 30 25 2.5 2.5 6 +25C 6 7 -83 +25C -82 -83 -92 +25C +25C +25C -85 -87 350 0.02 MHz % dB dB pF 60 150 200 100 120 ns ns ns pC pF pF
VCOM_ = 0V, CCOM_(OFF) f = 1MHz, Figure 7
COM_ On Capacitance
CCOM_(ON)
MAX4565 VCOM_ = VNO_ = 0V, MAX4566 f = 1MHz, Figure 7 MAX4567 RL = 50, VCOM_ = 1VRMS, f = 10MHz, Figure 6 RL = 50, VCOM_ = 1VRMS, f = 10MHz, Figure 6 Figure 6, RL = 50 VIN = 5Vp-p, f < 20kHz, 600 in and out MAX4565 MAX4566 MAX4567 MAX4565 MAX4566 MAX4567
Off Isolation (Note 7)
VISO
Channel-to-Channel Crosstalk (Note 8) -3dB Bandwidth (Note 9) Distortion POWER SUPPLY Power-Supply Range V+ Supply Current V - Supply Current
VCT BW THD+N
V+, VI+ IV+ = 5.5V, all VIN_ = 0V or V+ V- = -5.5V
C, E +25C C, E +25C C, E
-6 -1 -10 -1 -10 0.05 0.05
+6 1 10 1 10
V A A
_______________________________________________________________________________________
3
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
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 = +25C.) PARAMETER ANALOG SWITCH Analog Signal Range Signal-Path On-Resistance Signal-Path On-Resistance Match NO_, NC_ Off Leakage Current (Notes 6, 10) COM_ Off Leakage Current (Notes 6, 10) COM_ On Leakage Current (Notes 6, 10) LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low VIN_H VIN_L IINH_, IINL_ VIN_ = 0.8V or 2.4V C, E C, E C, E 0.8 -1 1.5 1.5 0.001 1 2.4 V V A VCOM_, VNO_, VNC_ RON RON INO_(OFF), INC_(OFF) ICOM_(OFF) ICOM_(ON) (Note 3) V+ = 4.5V, VCOM_ = 3.5V, ICOM_ = 1mA V+ = 4.5V, VCOM_ = 3.5V, ICOM_ = 1mA V+ = 5.5V, VCOM_ = 1V, VN_ = 4.5V V+ = 5.5V, VCOM_ = 1V, VN_ = 4.5V V+ = 5.5V; VCOM_ = 1V, 4.5V +25C +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E -1 -10 -1 -10 -2 -20 2 0 68 V+ 120 150 5 6 1 10 1 10 2 20 V nA nA nA SYMBOL CONDITIONS TA MIN TYP (Note 2) MAX UNITS
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Time Delay (MAX4566/MAX4567 only) Charge Injection Off-Isolation (Note 7) tON tOFF tBBM Q VCOM_ = 3V, V+ = 5V, Figure 3 VCOM_ = 3V, V+ = 5V, Figure 3 VCOM_ = 3V, V+ = 5V, Figure 4 CL = 1.0nF, VNO = 2.5V, RS = 0, Figure 5 RL = 50, f = 10MHz, VCOM_ = 1VRMS, Figure 6 RL = 50, f = 10MHz, VCOM_ = 1VRMS, MAX4567 Figure 6 RL = 50, Figure 6 +25C C, E +25C C, E +25C +25C 10 90 7 25 30 130 200 250 120 150 ns ns ns pC
VISO
+25C
-81
dB
Channel-to-Channel Crosstalk (Note 8) -3dB Bandwidth (Note 9) POWER SUPPLY V+ Supply Current
VCT BW
+25C +25C +25C C, E -1 -10
-86 320 0.05 1 10
dB MHz
I+
V+ = 5.5V, all VIN_ = 0V or V+
A
4
_______________________________________________________________________________________
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 = +25C.) PARAMETER 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 VIN_H VIN_L IINH_, IINL_ (Note 3) (Note 3) VIN_ = 0.8V or 2.4V (Note 3) C, E C, E C, E 0.8 -1 1.0 1.0 1 2.4 V V A VCOM_, VNO_, VNC_ RON (Note 3) V+ = 2.7V, VCOM_ = 1V, ICOM_ = 1mA +25C +25C C, E 0 150 V+ 350 450 V SYMBOL CONDITIONS TA MIN TYP (Note 2) MAX UNITS
MAX4565/MAX4566/MAX4567
SWITCH DYNAMIC CHARACTERISTICS (Note 3) Turn-On Time Turn-Off Time Break-Before-Make Time Delay (MAX4566/MAX4567 only) POWER SUPPLY V+ Supply Current V+ Supply Current Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: I+ V+ = 3.6V, all VIN_ = 0V or V+ +25C C, E -1 -10 0.05 1 10 A tON tOFF tBBM VCOM_ = 1.5V, V+ = 2.7V, Figure 3 (Note 3) VCOM_ = 1.5V, V+ = 2.7V, Figure 3 (Note 3) VCOM_ = 1.5V, V+ = 2.7V, Figure 4 (Note 3) +25C C, E +25C C, E +25C 10 120 40 270 500 600 100 120 ns ns ns
The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Guaranteed by design. RON = RON(MAX) - RON(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 +25C. Off isolation = 20log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to off switch. Between any two switches. -3dB bandwidth is measured relative to 100kHz. Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
_______________________________________________________________________________________
5
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
__________________________________________Typical Operating Characteristics
(V+ = +5V, V- = -5V, TA = +25C, GND = 0V, packages are surface mount, unless otherwise noted.)
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
MAX4565TOC02 MAX4565 TOC03
ON RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX4565TOC01
ON RESISTANCE vs. VCOM (SINGLE SUPPLY)
1000 65 55 45 RON () 35 25 V+ = 10V
1000 V+ = 1.2V, V- = -1.2V V+ = 2.7V, V- = -2.7V 100 V+ = 2V, V- = -2V
V+ = 2V V+ = 2.7V RON () 100 V+ = 3.3V V+ = 5V V+ = 7.5V
TA = +125C TA = +85C TA = +25C TA = 0C TA = -40C
RON ()
V+ = 5V, V- = -5V 10 -5 -4 -3 -2 -1 0 1
V+ = 3.3V, V- = -3.3V 10 2 3 4 5 0
15 V- = 0V 1 2 3 4 5 6 7 8 9 10 5 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V)
VCOM (V)
VCOM (V)
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
MAX4565 TOC04
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4565 TOC05
CHARGE INJECTION vs. VCOM
MAX4565 TOC06
130 110 90 RON () 70 50 30 10 0
10
60 50 40
TA = +125C TA = +85C TA = +25C TA = 0C TA = -55C
1 LEAKAGE (nA) ON LEAKAGE OFF LEAKAGE
Qj (pC)
0.1
30 20 10
DUAL SUPPLIES
0.01
SINGLE SUPPLY
0.001 0 0.0001 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCOM (V) -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) -10 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V)
ON/OFF TIME vs. SUPPLY VOLTAGE
MAX4565 TOC07
ON/OFF TIME vs. TEMPERATURE
100 90 80 tON, tOFF (ns) tON tON I+, I- (A) 0.01
MAX4565 TOC08
POWER-SUPPLY CURRENT vs. TEMPERATURE
MAX4565 TOC09
250
110
1
200 tON, tOFF (ns)
0.1 I+ I0.001
150
70 60 50 40 30 tOFF tOFF
100 tON 50 tOFF 0 2 3 4 5 6 8 V+, V- (V)
0.0001
20 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)
6
_______________________________________________________________________________________
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches
____________________________Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, TA = +25C, GND = 0V, packages are surface mount, unless otherwise noted.)
MAX4567 TOTAL HARMONIC DISTORTION vs. FREQUENCY
V+ = +5V V- = -5V SIGNAL = 5Vp-p 600 IN AND OUT
MAX14565 TOC14 MAX4565TOC10
MAX4565/MAX4566/MAX4567
LOGIC-LEVEL THRESHOLD VOLTAGE vs. V+ SUPPLY VOLTAGE
3.0 2.5 2.0 1.5 1.0 0.5 0 0 2 4 6 V+ (V) 8 10 12 100 TOTAL HARMONIC DISTORTION (%)
LOGIC-LEVEL THRESHOLD (V)
10
1
0.1
0.01 10 100 1k FREQUENCY (Hz) 10k 100k
MAX4565 FREQUENCY RESPONSE
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 1 10 ON LOSS
MAX14565 TOC11
MAX4566 FREQUENCY RESPONSE
120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 1000 0 -10 -20 ON PHASE (DEGREES) -30 -40 LOSS (dB) -50 -60 -70 -80 -90 -100 -110 -120 0.1 1
MAX4565 TOC12
SWITCH LOSS (dB)
20 10 0 OFF ISOLATION -10 -20 -30 -40 -50 -60 1000
ON PHASE OFF ISOLATION OPPOSITE CHANNEL CROSSTALK 100
PHASE (ON)
ADJACENT CHANNEL CROSSTALK (ON) 10 FREQUENCY (MHz) 100
FREQUENCY (MHz)
MAX4567 FREQUENCY RESPONSE
-10 -20 SWITCH LOSS (dB) -30 -40 -50 -60 -70 -80 -90 -100 1 10 100 1000 FREQUENCY (MHz) CROSSTALK ON PHASE ON LOSS
MAX4565toc13
0
100 80 60 40 20 0 -20 -40 -60 -80 -100 ON PHASE (DEGREES)
OFF ISOLATION
_______________________________________________________________________________________
PHASE (DEGREES)
ADJACENT CHANNEL CROSSTALK
INSERTION LOSS (ON) OPPOSITE CHANNEL CROSSTALK (ON)
60 50 40 30
7
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
______________________________________________________________Pin Description
PIN NAME MAX4565 1, 10, 11, 20 3, 6, 8, 13, 15, 18 16 5 4, 7, 14, 17 -- 2, 9, 12, 19 MAX4566 1, 16 3, 7, 10, 14 12 5 4, 13 6, 11 2, 8, 9, 15 MAX4567 1, 9 4, 6, 12, 14 7, 15 3, 11 2, 16 8, 10 5, 13 IN_ GND_ V+ VNO_ NC_ 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). Positive Supply-Voltage Input (analog and digital) Negative Supply-Voltage Input. Connect to ground plane for single-supply operation. Analog Switch Normally Open** Terminals Analog Switch Normally Closed** Terminals Analog Switch Common** Terminals FUNCTION*
* 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
The MAX4565/MAX4566/MAX4567 are high-frequency "T" switches. Each "T" switch consists of two series CMOS switches, with a third N-channel switch at the junction that shunts capacitively-coupled signals to ground when the series switches are off. This produces superior high-frequency signal isolation when the switch is turned off.
NORMALLY OPEN SWITCH CONSTRUCTION COM_ D IN_ 0 1 V+ A1 IN_ S GND_ VA2 (NC) ESD DIODES ON GND_, IN_, COM_, NO_, AND NC_ VV+ A2 A3 D N3 COM_ - NO_ OFF ON P1 S D S P2 D N1 S D N2 S NO_
Logic-Level Translators
The MAX4565/MAX4566/MAX4567 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.
8
Figure 1. T-Switch Construction
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 (i.e., signals may pass in either direction). The off MOSFET, N3, has no DC conduction, but has a small
_______________________________________________________________________________________
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches
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 350MHz bandwidth when the switches are on. Typical attenuation in 50 systems is -2.5dB and is reasonably flat up to 300MHz. 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 MAX4565/MAX4566/MAX4567 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. 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 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.
MAX4565/MAX4566/MAX4567
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 50 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 MAX4565/MAX4566/MAX4567 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
Bipolar-Supply Operation The MAX4565/MAX4566/MAX4567 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 MAX4565/MAX4566/MAX4567 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 MAX4565/MAX4566/MAX4567. Even 5% tolerance supplies may have overshoot or noise spikes that exceed 13.0V.
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9
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
Single-Supply Operation The MAX4565/MAX4566/MAX4567 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.) 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 MAX4565/MAX4566/MAX4567 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.
not a normal logic signal. (The GND_ voltages cannot exceed (V+ - 2V) or V-.) Elevating GND_ reduces off isolation. For example, using the MAX4565, 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 railto-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_ should never exceed V-. GND_ should be separated from 0V only if the logiclevel 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 MAX4565 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.
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.
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
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 twosided 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. Bypass all V+ and V- pins to the ground plane with surface-mount 10nF capacitors. For DIP packages, mount the capacitors 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, 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.
10
______________________________________________________________________________________
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches
The MAX4567 has two V+ and two 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 MAX4567 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 MAX4567 should have two 10nF bypass capacitors connected (one to each V+ pin) as close to the package as possible. On the MAX4565, 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.
MAX4565/MAX4566/MAX4567
Board Layout
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.
10nF
V+
GND5 GND6 COM1 GND1 50/75 OUT/IN COM2 GND2 COM3 GND3 COM4 GND4 IN1 IN2 IN3 IN4 IN1 IN2 IN3 IN4
V+ 1 1 2 2 OUT
MAX4565
NO1
3 4
3 4
MAX4565
1 2 3 4 OUT
NO2
MAX4565
NO3
50/75 OUT/IN
ADDRESS DECODING
NO4
5 6
1 2
OUT TO ADDITIONAL MUXES
7 V10nF 8
3 4
MAX4565
V-
Figure 2. 4-Channel Multiplexer
______________________________________________________________________________________ 11
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
Multiplexer
With its excellent off isolation, the MAX4565 is ideal for use in high-frequency video multiplexers. Figure 2 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 to maintain a high bandwidth. If more than four mux channels are needed, the 4-channel circuit should be duplicated and cascaded.
______________________________________________Test Circuits/Timing Diagrams
10nF +5V
V+ NO_OR NC_
V+ 3V VIN_ 0V 50% 50%
VIN_
MAX4565 MAX4566 MAX4567
IN_ GND_ 50 10nF -5V COM_ VVOUT
90% VOUT 90% 0V RL = 300 tOFF tON
REPEAT TEST FOR EACH SWITCH.
ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV). V- IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION.
Figure 3. Switching Time
12
______________________________________________________________________________________
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches
_________________________________Test Circuits/Timing Diagrams (continued)
10nF +5V
MAX4565/MAX4566/MAX4567
V+ * COM3 * COM2 3V
VIN_
MAX4566 * N02
IN_ GND_ 50 10nF -5V 80% VOUT 0V V+ **NC_ **NO_ 1V ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV). V+ IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. tBBM VRL = 300 VIN_ 0V * NC3 VOUT V+ 50% tR < 20ns tF < 20ns
* REPEAT TEST FOR OTHER PAIR OF SWITCHES. 10nF +5V
VIN_
MAX4567
IN_ GND_ 50 10nF -5V **COM_ VVOUT RL = 300
** REPEAT TEST FOR OTHER SWITCH.
Figure 4. Break-Before-Make Interval (MAX4566/MAX4567 only)
______________________________________________________________________________________
13
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
_________________________________Test Circuits/Timing Diagrams (continued)
10nF +5V
V+ NO_ OR NC_
V+ VNO = 0V VIN_ 0V
VIN_
MAX4565 MAX4566 MAX4567
IN_ GND_ 50 10nF -5V COM_ VVOUT CL = 1000pF
VOUT
VOUT
VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT x CL
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 5. Charge Injection
+5V 10nF NETWORK ANALYZER 0V OR V+ IN_ V+ NO_ VIN 50 50
V OFF ISOLATION = 20log OUT VIN ON LOSS = 20log VOUT VIN
MAX4565 MAX4566 MAX4567 COM_
GND_ V-
VOUT
MEAS
REF
V CROSSTALK = 20log OUT VIN
50
50
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 6. On Loss, Off Isolation, and Crosstalk
14
______________________________________________________________________________________
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches
Test Circuits/Timing ______________Diagrams (continued)
10nF +5V
MAX4565/MAX4566/MAX4567
_________________Chip Topographies
MAX4565
COM1 IN1 IN2 COM2
0V OR V+
IN_
V+
NO_ NC_ 1MHz CAPACITANCE ANALYZER
N.C. GND1 NO1 VGND5 NO4
GND2 NO2 V+ GND6 NO3 GND3 N.C. 0.082" (2.08mm)
MAX4565 MAX4566 MAX4567
GND_ V-
COM_
10nF -5V ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (0V).
GND4
Figure 7. NO_, NC_, COM_ Capacitance
COM4 IN4 IN3 COM3 0.072" (1.83mm)
MAX4566
COM1 IN1 IN2 COM2
MAX4567
NO1 IN1 NO2 V+
N.C. GND1 NO1 VN.C. NC4 N.C.
GND2 NO2 V+ 0.082" N.C. (2.08mm) NC3 N.C. N.C.
VGND1 N.C. N.C. COM1 N.C. GND4
GND2 N.C. N.C. COM2 N.C. GND3 V0.082" (2.08mm)
GND4 COM4 COM3 GND3 0.072" (1.83mm)
V+
NC1 IN2 NC2 0.072" (1.83mm)
TRANSISTOR COUNT: 257 SUBSTRATE INTERNALLY CONNECTED TO V+
______________________________________________________________________________________ 15
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches MAX4565/MAX4566/MAX4567
___________________________________________Ordering Information (continued)
PART MAX4565CAP MAX4565C/D MAX4565EPP MAX4565EWP MAX4565EAP MAX4566CPE MAX4566CSE MAX4566CEE MAX4566C/D MAX4566EPE MAX4566ESE TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 20 SSOP Dice* 20 Plastic DIP 20 Wide SO 20 SSOP 16 Plastic DIP 16 Narrow SO 16 QSOP Dice* 16 Plastic DIP 16 Narrow SO PART MAX4566EEE MAX4567CPE MAX4567CSE MAX4567CEE MAX4567C/D MAX4567EPE MAX4567ESE MAX4567EEE TEMP. RANGE -40C to +85C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP Dice* 16 Plastic DIP 16 Narrow SO 16 QSOP
*Contact factory for dice specifications.
________________________________________________________Package Information
QSOP.EPS
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.


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