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19-1425; Rev 0; 1/99
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
General Description
The MAX4588 low-voltage, dual 4-channel multiplexer is designed for RF and video signal processing at frequencies up to 180MHz in 50 and 75 systems. A flexible digital interface allows control of on-chip functions through either a parallel interface or an SPITM/ MICROWIRETM serial port. Each channel of the MAX4588 is designed using a "T" switch configuration, ensuring excellent high-frequency off-isolation. The MAX4588 has low on-resistance of 60 max, with an on-resistance match across all channels of 4 max. Additionally, on-resistance is flat across the specified signal range (2 max). The offleakage current is under 1nA at TA = +25C, and less than 10nA at TA = +85C. The MAX4588 operates from single +2.7V to +12V or dual 2.7V to 6V supplies. When operating with a +5V supply, the inputs maintain TTL- and CMOS-level compatibility. The MAX4588 is available in 28-pin narrow DIP, wide SO, and space-saving SSOP packages. o High Off-Isolation: -74dB at 10MHz o Low Crosstalk: -70dB up to 10MHz o 16MHz -0.1dB Signal Bandwidth o 180MHz -3dB Signal Bandwidth o 60 (max) On-Resistance with 5V Supplies o 4 (max) On-Resistance Matching with 5V Supplies o 2 (max) On-Resistance Flatness with 5V Supplies o +2.7V to +12V Single Supply 2.7V to 6V Dual Supplies o Low Power Consumption: <20W o Rail-to-Rail(R), Bidirectional Signal Handling o Parallel or SPI/MICROWIRE-Compatible Serial Interface o >2kV ESD Protection per Method 3015.7 o TTL/CMOS-Compatible Inputs with VL = +5V
Features
o Low Insertion Loss: -2.5dB up to 100MHz
MAX4588
Applications
RF Switching Video Signal Routing High-Speed Data Acquisition Automatic Test Equipment Networking
Pin Configuration
TOP VIEW
GND 1 COM1 2 V+ 3 NO1 4 GND 5 NO2 6 GND 7 NO3 8 GND 9 NO4 10 4/8 11 RS 12 LE/CS 13 A2/SCLK 14 CONTROL LOGIC
Ordering Information
PART TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 28 SSOP 28 Wide SO 28 Narrow Plastic DIP 28 SSOP 28 Wide SO 28 Narrow Plastic DIP MAX4588CAI MAX4588CWI MAX4588CPI MAX4588EAI MAX4588EWI MAX4588EPI
MAX4588
28 COM2 27 V26 NO5 25 GND 24 NO6 23 GND 22 NO7 21 GND 20 NO8 19 VL 18 SER/PAR 17 EN 16 A0/DOUT 15 A1/DIN
SSOP/SO/DIP
SPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
1
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND) V+ ........................................................................-0.3V to +13.0V VL .......................-0.3V to (V+ + 0.3V) or 7V (whichever is lower) V- ........................................................................-13.0V to +0.3V V+ to V-................................................................-0.3V to +13.0V VNO_, VCOM_ (Note 1) ..........................(V- - 0.3V) to (V+ + 0.3V) 4/8, RS, LE/CS, A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR to GND ...............-0.3V to (V+ + 0.3V) Continuous Current into Any Terminal..............................20mA Peak Current into Any Terminal (pulsed at 1ms, 10% duty cycle)..................................40mA ESD per Method 3015.7.......................................................2kV Continuous Power Dissipation (TA = +70C) SSOP (derate 9.52mW/C above +70C) ....................762mW Wide SO (derate 12.50mW/C above +70C)................1.00W Plastic DIP (derate 14.29mW/C above +70C) ............1.14W Operating Temperature Ranges MAX4588C_ I ......................................................0C to +70C MAX4588E_ I ...................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: Voltages on these 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+ = VL = +4.5V to +5.5V, V- = -4.5V to -5.5V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +5V, V- = -5V.) (Note 2) PARAMETER ANALOG SWITCH ANALOG Analog Signal Range (Note 3) On-Resistance On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 5) NO_ Off-Leakage Current (Note 6) COM_ Off-Leakage Current (Note 6) COM_ On-Leakage Current (Note 6) Input Logic Threshold High Input Logic Threshold Low Input Threshold Hysteresis Input Current DOUT Logic Low Output DOUT Logic High Output IIN VOL VOH VIN_ = 0 or VL ISINK = 3.2mA ISOURCE = -1mA C, E C, E C, E VL - 1 -1 OUTPUT (SERIAL LOGIC OUTPUT (SERIAL INTERFACE) 0.4 V V VCOM_, VNO RON RON RFLAT(ON) INO_(OFF) ICOM_(OFF) ICOM_(ON) V+ = 5V, V- = -5V, VNO_ = 2V, ICOM_ = 4mA V+ = 5V, V- = 5V, VNO_ = 2V, ICOM_ = 4mA V+ = 5V; V- = -5V; VNO_ = 1V, 0, -1V; ICOM_ = 1mA V+ = 5.5V, V- = -5.5V, - VCOM_ = 4.5V, VNO_ = + 4.5V V+ = 5.5V, V- = -5.5V, - VCOM_ = 4.5V, VNO_ = + 4.5V +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E -1 -10 -2 -20 -2 -20 2.4 1.7 1.5 0.2 0.03 1 0.8 0.01 0.01 0.01 0.5 1 V40 V+ 60 75 4 5 2.5 3 1 10 2 20 2 20 V nA nA nA SYMBOL CONDITIONS TA MIN TYP MAX UNITS
V+ = 5.5V, V- = -5.5V, VCOM_ = 4.5V, +25C VNO_ = 4.5V or floating C, E C, E C, E
LOGIC INPUTS (Pins 11 LOGIC INPUTS (4/8, RS, LE/CS, A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR) VINH VINL V V V A
2
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(V+ = VL = +4.5V to +5.5V, V- = -4.5V to -5.5V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +5V, V- = -5V.) (Note 2) PARAMETER SYMBOL CONDITIONS VNO_ = 3V, V+ = 4.5V, V- = -4.5V, Figure 1 VNO_ = 3V, V+ = 4.5V, V- = -4.5V, Figure 1 VNO_ = 3V, V+ = 5.5V, V- = -5.5V, Figure 2 CL = 1.0nF, VNO_ = 0, RS = 0, Figure 3 TA +25C C, E +25C C, E C, E +25C +25C +25C +25C +25C +25C +25C +25C 10 180 15 2 4 7 -74 -70 180 140 16 11 80 0 80 80 6.25 80 80 60 0 50 150 0 80 80 80 150 MIN TYP 380 MAX 550 600 300 350 UNITS SWITCH DYNAMIC CHARACTERISTICS SWITCH DYNAMIC CHARACTurn-On Time Turn-Off Time Break-Before-Make Time Delay (Note 3) Charge Injection NO_ Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance Off-Isolation (Note 7) Channel-to-Channel Crosstalk -3dB Bandwidth -0.1dB Bandwidth PARALLEL-INTERFACE TIMING PARALLEL MODE INPUT TIMA_, EN to LE Rise Setup Time A_, EN to LE Rise Hold Time LE Low Pulse Width RS Low Pulse Width SERIAL-INTERFACE TIMING SERIAL PERIPHERAL INTEROperating Frequency SCLK Pulse Width High SCLK Pulse Width Low DIN to SCLK Rise Setup Time DIN to SCLK Rise Hold Time CS Fall to SCLK Rise Setup Time SCLK Rise to DOUT Valid CS Rise to SCLK Rise Hold Time CS Rise to SCLK Rise Setup Time CS Fall to SCLK Rise Hold Time RS Low Pulse Width fCLK tCH tCL tDS tDH tCSS0 tDO tCSH1 tCSS1 tCSS1 tRS Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 CL = 50pF, Figure 7 Figure 7 Figure 7 Figure 7 Figure 6 C, E C, E C, E C, E C, E C, E C, E C, E C, E C, E C, E MHz ns ns ns ns ns ns ns ns ns ns tDS tDH tL tRS Figure 6 Figure 6 Figure 6 Figure 6 C, E C, E C, E C, E ns ns ns ns tON tOFF tBBM Q ns ns ns pC pF pF pF dB dB MHz MHz
MAX4588
CNO_(OFF) VNO_ = 0, fIN = 1MHz, Figure 4 CCOM_(OFF) VCOM_ = 0, fIN = 1MHz, Figure 4 CCOM_(ON) VCOM_ = 0, fIN = 1MHz, Figure 4 VISO VCT BW BW VNO_ = 1VRMS, f = 10MHz, all channels off, Figure 5 VNO_ = 1VRMS, f = 10MHz, Figure 5 Figure 5 Figure 5 4-channel mode 8-channel mode 4-channel mode 8-channel mode
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3
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(V+ = VL = +4.5V to +5.5V, V- = -4.5V to -5.5V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +5V, V- = -5V.) (Note 2) PARAMETER POWER SUPPLY POWER SUPPLY Power-Supply Range V+ Supply Current V - Supply Current VL Supply Current V+, VVL I+ IIL V+ = 5.5V, V- = -5.5V V+ = 5.5V, V- = -5.5V V+ = 5.5V VL = 5.5V, all VIN_ = 0 or VL +25C C, E +25C C, E C, E 2.7 2.7 -1 -10 -1 -10 -10 2 0.0001 0.0001 6 V+ 1 10 1 10 10 V A A A SYMBOL CONDITIONS TA MIN TYP MAX UNITS
ELECTRICAL CHARACTERISTICS--Single +5V Supply
(V+ = VL = +4.5V to +5.5V, V- = 0, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +5V.) (Note 2) PARAMETER ANALOG SWITCH ANALOG Analog Signal Range (Note 3) On-Resistance On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 5) NO_ Off Leakage Current (Notes 6, 9) COM_ Off Leakage Current (Notes 6, 9) COM_ On Leakage Current (Notes 6, 9) VCOM_, VNO_ RON RON RFLAT(ON) INO_(OFF) ICOM(OFF) ICOM_(ON) V+ = 5V, VNO_ = 3V, ICOM_ = 4mA V+ = 5V, VNO_ = 3V, ICOM_ = 4mA
COM_ V+ = 5V, ICOM_ = 4mA, VNO_ = 2V, 3V, 4V
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
0 +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E C, E C, E VIN = 0 or VL ISINK = 3.2mA ISOURCE = -1mA C, E C, E C, E VL - 1 -1 -1 -10 -2 -20 -2 -20 2.4 1.7 1.5 0.2 0.005 0.005 0.005 4 1 80
V+ 120 150 8 10 10 12 1 10 2 20 2 20
V nA nA nA
V+ = 5.5V; VCOM_ = 4.5V, 1V; VNO_ = 1V, 4.5V V+ = 5.5V; VCOM_ = 4.5V, 1V; VNO_ = 1V, 4.5V V+ = 5.5V; VCOM_ = 4.5V, 1V; VNO_ = 4.5V, 1V, or floating
LOGIC INPUTS (Pins 11 through A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR) INPUTS (4/8, RS, LE/CS, Input Logic Threshold High Input Logic Threshold Low Input Threshold Hysteresis Input Current DOUT Logic Low Output DOUT Logic High Output IIN VOL VOH LOGIC OUTPUT (SERIAL INTERFACE) LOGIC OUTPUT (SERIAL 0.4 V V VINH VINL V 0.8 1 V V A
4
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = VL = +4.5V to +5.5V, V- = 0, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA +25C C, E +25C C, E C, E +25C +25C +25C +25C +25C 10 200 5 -65 -70 100 75 10 7 80 0 80 80 6.25 80 80 60 0 50 80 0 80 150 80 150 MIN TYP 550 MAX 800 900 300 350 UNITS SWITCH DYNAMIC CHARACTERISTICS SWITCH DYNAMIC CHARACTurn-On Time Turn-Off Time Break-Before-Make Time Delay (Note 3) Charge Injection Off-Isolation Channel-to-Channel Crosstalk -3dB Bandwidth -0.1dB Bandwidth PARALLEL-INTERFACE TIMING PARALLEL MODE INPUT TIMA_, EN to LE Rise Setup Time A_, EN to LE Rise Hold Time LE Low Pulse Width RS Low Pulse Width SERIAL-INTERFACE TIMING SERIAL PERIPHERAL INTEROperating Frequency SCLK Pulse Width High SCLK Pulse Width Low DIN to SCLK Rise Setup Time DIN to SCLK Rise Hold Time CS Fall to SCLK Rise Setup Time CS Fall to SCLK Rise Hold Time CS Rise to SCLK Rise Hold Time CS Rise to SCLK Rise Setup Time SCLK Rise to DOUT Valid RS Low Pulse Width fCLK tCH tCL tDS tDH tCSS0 tCSS1 tCSH1 tCSS1 tDO tRS Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 CL = 50pF, Figure 7 Figure 6 C, E C, E C, E C, E C, E C, E C, E C, E C, E C, E C, E MHz ns ns ns ns ns ns ns ns ns ns tDS tDH tL tRS Figure 6 Figure 6 Figure 6 Figure 6 C, E C, E C, E C, E ns ns ns ns tON tOFF tBBM Q VISO VCT BW BW VNO_ = 3V, V+ = 4.5V, Figure 1 VNO_ = 3V, V+ = 4.5V, Figure 1 VNO_ = 3V, V+ = 5.5V, Figure 2 CL = 1.0nF, VNO_ = 2.5V, RS = 0, Figure 3 VNO_ = 1VRMS, f = 10MHz, all channels off, Figure 5 VNO_ = 1VRMS, f = 10MHz, Figure 5 Figure 5 Figure 5 4-channel mode 8-channel mode 4-channel mode 8-channel mode ns ns ns pC dB dB MHz MHz
MAX4588
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5
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = VL = +4.5V to +5.5V, V- = 0, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +5V.) (Note 2) PARAMETER POWER SUPPLY POWER SUPPLY V+ Power-Supply Range VL I+ IL V+ 6.5V V+ > 6.5V V+ = 5.5V, VIN = 0 or VL VL = 5.5V, all VIN_ = 0 or VL +25C C, E C, E 2.7 2.7 2.7 -1 -10 -10 2 12 V+ 6.5 1 10 10 A A V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
V+ Supply Current VL Supply Current
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = VL = +2.7V to +3.6V, V- = 0, VINH = +2V, VINL = +0.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +3.0V.) PARAMETER ANALOG SWITCH ANALOG SWITCH Analog Signal Range On-Resistance VCOM_, VNO_ RON V+ = 2.7V, VNO_ = 1V, ICOM_ = 1mA +25C C, E C, E C, E VIN_ = 0 or VL C, E +25C C, E +25C C, E +25C 10 350 250 -1 700 2.0 0.5 1 1000 200 400 500 0 240 V+ 350 450 V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
LOGIC INPUT (Pins 11 through A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR) INPUTS (4/8, RS, LE/CS, Input Logic Threshold High Input Logic Threshold Low Input Current VINH VINL IIN V V A
SWITCH DYNAMIC CHARACTERISTICS SWITCH DYNAMIC CHARACTurn-On Time Turn-Off Time Break-Before-Make Time Delay (Note 3) PARALLEL-INTERFACE TIMING PARALLEL MODE INPUT TIMA_, EN to LE Rise Setup Time A_, EN to LE Rise Hold Time LE Low Pulse Width RS Low Pulse Width SERIAL-INTERFACE TIMING SERIAL PERIPHERAL INTEROperating Frequency SCLK Pulse Width High SCLK Pulse Width Low DIN to SCLK Rise Setup Time DIN to SCLK Rise Hold Time RS Low Pulse Width 6 fCLK tCH tCL tDS tDH tRS Figure 7 Figure 7 Figure 7 Figure 7 Figure 7 Figure 6 C, E C, E C, E C, E C, E C, E 200 200 100 0 200 2.1 MHz ns ns ns ns ns tDS tDH tL tRS Figure 6 Figure 6 Figure 6 Figure 6 C, E C, E C, E C, E 200 0 200 200 ns ns ns ns tON tOFF tBBM VNO_ = 1.5V, V+ = 2.7V, Figure 1 VNO_ = 1.5V, V+ = 2.7V, Figure 1 VNO_ = 1.5V, V+ = 3.6V, Figure 2 ns ns ns
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
ELECTRICAL CHARACTERISTICS--Single +3V Supply (continued)
(V+ = VL = +2.7V to +3.6V, V- = 0, VINH = +2V, VINL = +0.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, V+ = VL = +3.0V.) PARAMETER CS Fall to SCLK Rise Setup Time CS Rise to SCLK Rise Hold Time CS Rise to SCLK Rise Setup Time CS Fall to SCLK Rise Hold Time SCLK Rise to DOUT Valid POWER SUPPLY POWER SUPPLY V+ Supply Current VL Supply Current Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: I+ IL V+ = 3.6V, VIN = 0 or VL VL = 3.6V, all VIN = 0 or VL +25C C, E C, E -1 -10 -10 1 1 10 10 A A SYMBOL tCSS0 tCSH1 tCSS1 tCSS1 tDO Figure 7 Figure 7 Figure 7 Figure 7 CL = 50pF, Figure 7 CONDITIONS TA C, E C, E C, E C, E C, E MIN 100 0 200 200 250 TYP MAX UNITS ns ns ns ns ns
MAX4588
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 maximum rated hot temperature and guaranteed by correlation at TA = +25C. 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.
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7
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
Typical Operating Characteristics
(V+ = VL = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX4588-01
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
V+ = +2.5V 200 ON-RESISTANCE () V- = 0
MAX4588-02
100 90 80 ON-RESISTANCE () 70 60 50 40 30 20 10 0 -6 -4 -2 0 VCOM (V) 2 4 6 6V 4V 5V 3V 2.5V
250
150
V+ = +3.0V V+ = +3.6V V+ = +5V
100
50
V+ = +9V V+ = +12V
0 0 2 4 6 VCOM (V) 8 10 12
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
MAX4588-03
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
130 120 ON-RESISTANCE () V- = 0
MAX4588-04
70 65 60 ON-RESISTANCE () 55 50 45 40 35 30 25 20 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V) TA = +85C TA = +50C TA = +25C TA = 0C TA = -40C
140
110 100 90 80 70 60 50 40 0
TA = +85C TA = +50C TA = +25C TA = 0C TA = -40C
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCOM (V)
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4588-05
CHARGE INJECTION vs. VCOM
MAX4588-06
10n
35 30 CHARGE INJECTION (pC) 25 20 15 10 5 0 SINGLE SUPPLY DUAL SUPPLIES
1n LEAKAGE CURRENT (A)
100p ON-LEAKAGE 10p OFF-LEAKAGE 1p
0.1p -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
-5
-4
-3
-2
-1
0
1
2
3
4
5
VCOM (V)
8
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
Typical Operating Characteristics (continued)
(V+ = VL = +5V, V- = -5V, TA = +25C, unless otherwise noted.)
MAX4588
ON/OFF TIME vs. SUPPLY VOLTAGE
MAX4588-07
ON/OFF TIME vs. TEMPERATURE
MAX4588-08
SUPPLY CURRENT vs. TEMPERATURE
IL 1 SUPPLY CURRENT (A) 100n 10n 1n 100p 10p
MAX4588-09
600 500 400 300 200 100 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 tON
500
10
400 tON, tOFF (ns)
tON
tON, tOFF (ns)
300
200
tOFF
tOFF 100
I+ I-
0 6.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE (C) SUPPLY VOLTAGE (V)
1p -40 -20
0
20
40
60
80
100 120
TEMPERATURE (C)
INSERTION LOSS, OFF-ISOLATION, AND CROSSTALK vs. FREQUENCY (DUAL SUPPLIES)
MAX4588-10
INSERTION LOSS, OFF-ISOLATION, AND CROSSTALK vs. FREQUENCY (SINGLE SUPPLY)
0 -10 AMPLITUDE (dB) INSERTION LOSS RS = 75 RL = 600
MAX4588-11
10 0 -10 AMPLITUDE (dB) -20 -30 -40 -50 -60 -70 -80 -90 100k 1M 10M FREQUENCY (Hz) 100M OFF-ISOLATION CROSSTALK ON LOSS
10
RS = 75 RL = 600
-20 -30 -40 -50 -60 -70 -80 -90
CROSSTALK
OFF-ISOLATION
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
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9
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
Pin Description
PIN 1, 5, 7, 9, 21, 23, 25 2 3 4 6 8 10 11 NAME GND COM1 V+ NO1 NO2 NO3 NO4 4/8 FUNCTION Ground. Connect all ground pins to a ground plane. See Grounding section. Analog Switch Common Terminal. See Truth Table. Analog Positive Supply Voltage Input Normally Open Analog Input Terminal. See Truth Tables. Normally Open Analog Input Terminal. See Truth Tables. Normally Open Analog Input Terminal. See Truth Tables. Normally Open Analog Input Terminal. See Truth Tables. Multiplexer Configuration Control. Connect to VL to select dual 2-channel mode. Connect to GND for single 4-channel multiplexer operation. See Truth Tables. Active-Low Reset Input. In serial mode, drive RS low to force the latches and shift registers to the poweron reset state and force all switches open. In parallel mode, drive RS low to force the latches to the poweron reset state and force all switches open. See Truth Tables. In parallel mode, this pin is the transparent Latch Enable. In the serial mode, this pin is the Chip-Select Input. See Truth Tables. Most Significant Address Bit in parallel mode with 4/8 low. If 4/8 pin is high, this pin is ignored. In the serial mode, this is the Serial Shift Clock Input. Data is loaded on the rising edge of SCLK. See Truth Tables. Address Input in the parallel mode. Serial Data Input in serial mode. In serial mode, data is loaded on SCLK's rising edge. Least Significant Address Input in the parallel mode. In the serial mode this is an output from the internal 4-bit shift register. DOUT is intended for daisy-chain cascading. DOUT is not three-stated by CS. See Serial Operation. Switch Enable. Drive EN low to force all channels off. Drive high to allow normal multiplexer operation. Operates asynchronously in serial mode. In parallel mode, EN is latched when LE signal is high. Interface Select Input. Drive low for parallel data interface operation. Drive high for serial data interface operation and to enable the DOUT driver. Logic Supply Input. Powers the DOUT driver and other digital circuitry. VL sets both the digital input and output logic levels. Normally Open Analog Input Terminal. See Truth Tables. Normally Open Analog Input Terminal. See Truth Tables. Normally Open Analog Input Terminal. See Truth Tables. Normally Open Analog Input Terminal. See Truth Tables. Analog Negative Supply Voltage Input. Connect to ground plane for single-supply operation. Analog Switch Common Terminal. See Truth Tables.
12
RS
13 14 15
LE/CS A2/SCLK A1/DIN
16
A0/DOUT
17 18 19 20 22 24 26 27 28
EN SER/PAR VL NO8 NO7 NO6 NO5 VCOM2
10
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
V+ V+ LE/CS NO_ VNO_
EN
50%
50%
MAX4588
EN COM_ 300 VVGND VOUT 30pF VOUT 90% 90%
tOFF
tON
Figure 1. Turn-On/Turn-Off Time
V+ V+ LE/CS SER/PAR VNO_ NO_ NO_
A0
MAX4588
A0 COM_ 300 VVGND VOUT 30pF
VOUT
90%
GND tBBM
Figure 2. Break-Before-Make Time Delay
V+ LE/CS SER/PAR V+ NO_ 1nF 10F VNO_ EN
MAX4588
EN COM_ CL GND VVVOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT * CL VOUT VOUT VOUT
Figure 3. Charge Injection
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11
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
V+ V+ NO_ FLOATING NO_ 1MHz CAPACITANCE ANALYZER COM_ 1MHz CAPACITANCE ANALYZER GND FLOATING
MAX4588
COM_ GND VV-
MAX4588
Figure 4. NO_, COM_ Capacitance
V+ V+ NO_
MAX4588
49.9 56
50
+ -
NO_ 24.9 50
MEASURE NODE
VV-
COM_ 560 50
MEASURE NODE
ALL SIGNALS NORMALIZED TO VCOM = 0dB.
Figure 5. Off-Isolation, Crosstalk, and Bandwidth
tL
LE
tDS
tDH
MAX4588
A0, A1, A2, EN
tRS
RS
NOTE: ALL INPUT SIGNALS ARE SPECIFIED WITH tR AND tF <10ns. TIMING IS MEASURED FROM 50% OF DIGITAL SIGNAL.
Figure 6. Parallel Timing Diagram
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
CS
tCSS
tCH
tCL
tCSH
MAX4588
SCLK tDS tDH
DIN
A0 tDO
A1
A2
DISABLE
DOUT
NOTE: ALL INPUT SIGNALS ARE SPECIFIED WITH tR AND tF < 10ns. TIMING IS MEASURED FROM 50% OF DIGITAL SIGNAL.
Figure 7. Serial Timing Diagram
Detailed Description
Logic-Level Translators
The MAX4588 is constructed of high-frequency "T" switches, as shown in Figure 8. The logic-level inputs are translated by amplifier A1 into a V+ to V- logic signal that drives amplifier A2. 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, turning them fully on or off) from V+ to V-, and turns the N-channel MOSFET N3 on and off. The logiclevel threshold is determined by VL and GND.
COM_ NORMALLY OPEN SWITCH CONSTRUCTION N1 N2 NO_
P1 V+ VCC A1 INPUT GND A2 A3 N3
P2
Switch On Condition
When the switch is on, MOSFETs N1, N2, P1, and P2 are on and MOSFET N3 is off (Figure 8). 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 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. The MAX4588's construction allows an exceptional 180MHz bandwidth when the switches are on.
VESD DIODES ON GND, NO_, AND COM_
V+
V+
Figure 8. T-Switch Construction
Typical attenuation in 75 systems is 2.5dB and is reasonably flat up to 50MHz. 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.
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
The MAX4588 is optimized for 5V operation. Using lower supply voltages or a single supply increases switching time, on-resistance (and therefore on-state attenuation), and nonlinearity. analog switches. This drive signal is the only connection between the logic supplies and the analog supplies.
Switch Off Condition
When the switch is off, MOSFETs N1, N2, P1, and P2 are off and MOSFET N3 is on (Figure 8). The signal path is through the parasitic 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 75 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 MAX4588 construction is typical of many CMOS analog switches. It has four supply pins: V+, V-, VL, 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- and 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 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. VL 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
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Bipolar-Supply Operation The MAX4588 operates with bipolar supplies between 2.7V and 6V. The V+ and V- supplies are not required to be symmetrical, but their sum cannot exceed the absolute maximum rating of 13.0V. Do not connect the MAX4588 V+ pin to +3V and connect the logic-level input pins to +5V logic-level signals. This level exceeds the absolute maximum ratings, and may cause 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 MAX4588. Even 5% tolerance supplies may have overshoot or noise spikes that exceed 13.0V. Single-Supply Operation The MAX4588 operates from a single supply between +2.7V and +12V when V- is connected to GND. Observe all of the precautions listed in the BipolarSupply Operation section. Note, however, that these parts are optimized for 5V operation, and AC and DC characteristics are degraded significantly when operating at less than 5V. As the overall supply voltage (V+ to V-) is reduced, switching speed, on-resistance, offisolation, and distortion are degraded (see Typical Operating Characteristics). Single-supply operation also limits signal levels and interferes with grounded signals. When V- = 0, 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 MAX4588 is off (i.e., V+ = 0 and V= 0), the Absolute Maximum Ratings still apply. This means that none of the MAX4588 pins can exceed 0.3V. Voltages beyond 0.3V cause the internal ESDprotection diodes to conduct, with potentially catastrophic consequences. Power-Supply Sequencing When applying power to the MAX4588, follow this sequence: V+, V- (if biased to potential other than ground), VL, then logic inputs. Apply signals on the analog NO_ and COM_ pins any time after V+, V-, and GND voltages are set. Turning on all pins simultaneously is acceptable only if the circuit design guarantees concurrent power-up.
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
The power-down sequence is the opposite of the power-up sequence. That is, the VL and logic inputs must go to zero potential before (or simultaneously with) the V- then V+ supplies. The Absolute Maximum Ratings must always be observed in order to ensure proper operation. turability requirements. Again, do not use the throughhole pads as the current path for any other components. Bypass all V+ and V- pins to the ground plane with surface-mount 0.01F capacitors. Locate these 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. If board layout dictates that the bypass capacitors are mounted on the opposite side of the PC board, use short feedthroughs or vias, directly under the V+ and V- pins. Use multiple vias if possible. If V- is 0, connect it directly to the ground plane with solid copper. Keep all traces short.
MAX4588
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 must connect to it with solid copper. While the V+ and V- power-supply pins are common to all switches in a given package, each input is separated with ground pins that are not internally connected to each other. This contributes to the overall high-frequency performance by reducing channel-to-channel crosstalk. All the GND pins have ESD diodes to V+ and V-. In systems that have separate digital and analog (signal) grounds, connect all GND pins to analog signal ground. Preserving a good signal ground is much more important than preserving a digital ground. Ground current is only a few nanoamperes. The digital inputs have voltage thresholds determined by VL and GND (V- does not influence the logic-level threshold). With +5V applied to VL, the threshold is about 1.6V, ensuring compatibility with TTL- and CMOS-logic drivers. AC Ground and Bypassing A ground plane is mandatory for satisfactory highfrequency operation. Prototyping using hand wiring or wire-wrap boards is not recommended. Connect all 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.) Make the ground plane 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 has a minimal effect on the "on" characteristics of the switch at high frequencies, but will degrade the off-isolation and crosstalk. When using the MAX4588's SO package on PC boards with a buried ground plane, connect each GND pin to the ground plane with a separate via. Do not share this via with any other ground path. Providing a ground via on both sides of the SMT land further enhances the off-isolation by lowering the parasitic inductance. The DIP package can have the through-holes directly tied to the buried plane, or thermally relieved as required to meet manufac-
Signal Routing
Keep all signal leads as short as possible. Separate all signal leads from each other, and keep them away from any other traces that could induce interference. Separating the signal traces with generously sized ground wires also helps minimize interference. Routing signals via coaxial cable, terminated as close to the MAX4588 as possible, provides the highest isolation.
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.
Impedance Matching
The MAX4588 is intended for use in 75 systems, where the inputs are terminated external to the IC and the COM terminals see an impedance of 600 or higher. The MAX4588 can operate in 50 and 75 systems with terminations through the IC. However, variations in RON and RON flatness cause nonlinearities.
Crosstalk and Off-Isolation
The graphs shown in Typical Operating Characteristics for crosstalk and off-isolation are taken on adjacent channels. The adjacent channel is the worst-case condition. For example, NO1 has the worst off-isolation to COM1 due to their proximity. Furthermore, NO1 has the most crosstalk to NO2, and the least crosstalk to NO4. Choosing channels wisely necessitates separating the most sensitive channels from the most offensive. Conversely, the above information also applies to the NO5-NO8 inputs to the COM2 pin.
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
Power-On Reset (POR)
The MAX4588 has internal circuitry to guarantee a known state on power-up. In the default state, A0 = A1 = A2 = 0, disable = 1, and all switches are off. This state is equivalent to asserting RS during normal operation. This allows cascading of multiple MAX4588s using only one chip-select line. For example, one 16-bit write could load the shift registers of four cascaded MAX4588s. The data from the shift register is moved to the internal control latches only upon the rising edge of CS, so all four MAX4588s change state simultaneously.
Serial Operation
The serial mode is activated by driving the SER/PAR input pin to a logic high. The data is then entered using a normal SPI/MICROWIRE write operation. Refer to Figure 7 for a detailed diagram of the serial-interface logic. There are four flip-flops in the shift register, with the output of the fourth shift register being output on the DOUT pin. Note: DOUT changes on the rising edge of SCLK.
Parallel Operation
The parallel mode is activated by driving SER/PAR to a logic low. The MAX4588 is programmed by a latched parallel bus scheme. Refer to Figure 6 for a detailed diagram of the parallel-interface logic. Note that 4/8 is not latched. It is best to hard-wire 4/8 to a known state for the desired mode of operation, or to use a dedicated microcontroller port pin.
Truth Tables
Parallel Operation
SER/PAR 0 x 1 0 0 0 0 0 0 0 0 0 0 0 0 0 A2 x x x x 0 0 0 0 1 1 1 1 x x x x A1 x x x x 0 0 1 1 0 0 1 1 0 0 1 1 A0 x x x x 0 1 0 1 0 1 0 1 0 1 0 1 EN x x x 0 1 1 1 1 1 1 1 1 1 1 1 1 LE 1 x x 0 0 0 0 0 0 0 0 0 0 0 0 0 RS 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 8 4/8 x x x x 0 0 0 0 0 0 0 0 1 1 1 1 SWITCH STATES Maintain previous state. All switches off, latches are cleared. Serial Mode. Refer to Serial Operation Truth Table. All switches off. Connects NO1 to COM1 Connects NO2 to COM1 Connects NO3 to COM1 Connects NO4 to COM1 Connects NO5 to COM2 Connects NO6 to COM2 Connects NO7 to COM2 Connects NO8 to COM2 Connect NO1 to COM1 and NO5 to COM2 Connect NO2 to COM1 and NO6 to COM2 Connect NO3 to COM1 and NO7 to COM2 Connect NO4 to COM1 and NO8 to COM2
x = Don't Care Note: 4/8 is not latched when LE is high. When LE is low, all latches are transparent. A2, A1, A0, and EN are latched. Connect COM1 to COM2 externally for 1-of-8 single-ended operation.
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
Truth Tables (continued)
Serial Operation
SER/PAR 1 0 1 1 1 1 1 CS x x x 1 0 0 x SCLK x x x x DIN x x x x 0 1 x EN x x 0 1 1 1 1 RS 0 x 1 1 1 1 1 DOUT 0 High-Z * * * * * ON SWITCHES/STATES All switches off. Latches and shift register are cleared. This is the power-on reset (POR) state. Parallel Mode. Refer to Parallel Operation Truth Table. All switches off. Chip unselected. Input shift register loads one bit from DIN. DOUT updates on SCLK's rising edge. Input shift register loads one bit from DIN. DOUT updates on SCLK's rising edge. Contents of shift register transferred to control latches.
MAX4588
x = Don't Care *DOUT is delayed by 4 clock cycles from DIN.
Control Bit and 4/8 Logic
DISABLE BIT 1 0 0 0 0 0 0 0 0 0 0 0 0 A2 BIT x 0 0 0 0 1 1 1 1 x x x x A1 BIT x 0 0 1 1 0 0 1 1 0 0 1 1 A0 BIT x 0 1 0 1 0 1 0 1 0 1 0 1 8 4/8 PIN x 0 0 0 0 0 0 0 0 1 1 1 1 ON SWITCHES/STATES All switches off. Connect NO1 to COM1 Connect NO2 to COM1 Connect NO3 to COM1 Connect NO4 to COM1 Connect NO5 to COM2 Connect NO6 to COM2 Connect NO7 to COM2 Connect NO8 to COM2 Connect NO1 to COM1 and NO5 to COM2 Connect NO2 to COM1 and NO6 to COM2 Connect NO3 to COM2 and NO7 to COM2 Connect NO4 to COM2 and NO8 to COM2
x = Don't Care Note: DISABLE, A2, A1, and A0 are the 4 bits latched into the MAX4588 with a MICROWIRE/SPI write. A0 is the LSB (first bit in time). DISABLE is the MSB (last bit in time).
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Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
____________________Chip Information
TRANSISTOR COUNT: 1033
Package Information
28LNPDIP.EPS
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______________________________________________________________________________________
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer
Package Information (continued)
SOICW.EPS
MAX4588
______________________________________________________________________________________
19
Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588
Package Information (continued)
SSOP.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.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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