19-1425; Rev 0; 1/99 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer Features The MAX4588 low-voltage, dual 4-channel multiplexer is designed for RF and video signal processing at frequencies up to 180MHz in 50Ω and 75Ω systems. A flexible digital interface allows control of on-chip functions through either a parallel interface or an SPI™/ MICROWIRE™ serial port. ♦ Low Insertion Loss: -2.5dB up to 100MHz 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 60Ω max, with an on-resistance match across all channels of 4Ω max. Additionally, on-resistance is flat across the specified signal range (2Ω max). The offleakage current is under 1nA at TA = +25°C, and less than 10nA at TA = +85°C. 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. ♦ 180MHz -3dB Signal Bandwidth Applications ♦ High Off-Isolation: -74dB at 10MHz ♦ Low Crosstalk: -70dB up to 10MHz ♦ 16MHz -0.1dB Signal Bandwidth ♦ 60Ω (max) On-Resistance with ±5V Supplies ♦ 4Ω (max) On-Resistance Matching with ±5V Supplies ♦ 2Ω (max) On-Resistance Flatness with ±5V Supplies ♦ +2.7V to +12V Single Supply ±2.7V to ±6V Dual Supplies ♦ Low Power Consumption: <20µW ♦ Rail-to-Rail®, Bidirectional Signal Handling ♦ Parallel or SPI/MICROWIRE-Compatible Serial Interface RF Switching Automatic Test Equipment ♦ >±2kV ESD Protection per Method 3015.7 Video Signal Routing Networking ♦ TTL/CMOS-Compatible Inputs with VL = +5V High-Speed Data Acquisition Pin Configuration TOP VIEW GND 1 MAX4588 COM1 2 28 COM2 27 V- Ordering Information PART TEMP. RANGE MAX4588CAI 0°C to +70°C 28 SSOP PIN-PACKAGE MAX4588CWI 0°C to +70°C 28 Wide SO 28 Narrow Plastic DIP MAX4588CPI 0°C to +70°C V+ 3 26 NO5 MAX4588EAI -40°C to +85°C 28 SSOP NO1 4 25 GND MAX4588EWI -40°C to +85°C 28 Wide SO GND 5 24 NO6 MAX4588EPI -40°C to +85°C 28 Narrow Plastic DIP NO2 6 23 GND GND 7 22 NO7 NO3 8 21 GND GND 9 20 NO8 NO4 10 19 VL 4/8 11 RS 12 LE/CS 13 18 SER/PAR CONTROL LOGIC A2/SCLK 14 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. ________________________________________________________________ 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 1-800-835-8769. MAX4588 General Description MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer 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 = +70°C) SSOP (derate 9.52mW/°C above +70°C) ....................762mW Wide SO (derate 12.50mW/°C above +70°C)................1.00W Plastic DIP (derate 14.29mW/°C above +70°C) ............1.14W Operating Temperature Ranges MAX4588C_ I ......................................................0°C to +70°C MAX4588E_ I ...................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C 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 = +25°C, V+ = VL = +5V, V- = -5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS V+ V 60 Ω ANALOG ANALOG SWITCH Analog Signal Range (Note 3) On-Resistance On-Resistance Match Between Channels (Note 4) VCOM_, VNO V- RON V+ = 5V, V- = -5V, VNO_ = ±2V, ICOM_ = 4mA +25°C ∆RON V+ = 5V, V- = 5V, VNO_ = ±2V, ICOM_ = 4mA +25°C 40 C, E 75 1 C, E 4 5 On-Resistance Flatness (Note 5) RFLAT(ON) V+ = 5V; V- = -5V; VNO_ = 1V, 0, -1V; ICOM_ = 1mA +25°C 0.5 NO_ Off-Leakage Current (Note 6) INO_(OFF) V+ = 5.5V, V- = -5.5V, – 4.5V VCOM_ = ±4.5V, VNO_ = + +25°C -1 C, E -10 COM_ Off-Leakage Current (Note 6) ICOM_(OFF) V+ = 5.5V, V- = -5.5V, – 4.5V VCOM_ = ±4.5V, VNO_ = + +25°C -2 C, E -20 COM_ On-Leakage Current (Note 6) ICOM_(ON) V+ = 5.5V, V- = -5.5V, VCOM_ = ±4.5V, +25°C VNO_ = ±4.5V or floating C, E C, E 2.5 3 -2 0.01 1 10 0.01 2 20 0.01 -20 2 20 Ω Ω nA nA nA LOGIC INPUTS INPUTS (4/8, (Pins RS, 11 LE/CS, A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR) LOGIC Input Logic Threshold High VINH C, E Input Logic Threshold Low VINL C, E 2.4 1.5 Input Threshold Hysteresis Input Current 1.7 V 0.8 V 1 µA 0.4 V 0.2 IIN VIN_ = 0 or VL C, E -1 0.03 V OUTPUT(SERIAL (SERIAL INTERFACE) LOGIC OUTPUT DOUT Logic Low Output VOL ISINK = 3.2mA C, E DOUT Logic High Output VOH ISOURCE = -1mA C, E 2 VL - 1 _______________________________________________________________________________________ V Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer (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 = +25°C, V+ = VL = +5V, V- = -5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS SWITCH DYNAMIC DYNAMICCHARACCHARACTERISTICS SWITCH Turn-On Time tON VNO_ = 3V, V+ = 4.5V, V- = -4.5V, Figure 1 +25°C Turn-Off Time tOFF VNO_ = 3V, V+ = 4.5V, V- = -4.5V, Figure 1 +25°C Break-Before-Make Time Delay (Note 3) tBBM VNO_ = ±3V, V+ = 5.5V, V- = -5.5V, Figure 2 Charge Injection Q CL = 1.0nF, VNO_ = 0, RS = 0, Figure 3 380 C, E 150 C, E C, E 550 600 300 350 10 ns ns 180 ns +25°C 15 pC NO_ Off-Capacitance CNO_(OFF) VNO_ = 0, fIN = 1MHz, Figure 4 +25°C 2 pF COM_ Off-Capacitance CCOM_(OFF) VCOM_ = 0, fIN = 1MHz, Figure 4 +25°C 4 pF COM_ On-Capacitance CCOM_(ON) VCOM_ = 0, fIN = 1MHz, Figure 4 +25°C 7 pF -74 dB -70 dB Off-Isolation (Note 7) VISO VNO_ = 1VRMS, f = 10MHz, all channels off, Figure 5 +25°C Channel-to-Channel Crosstalk VCT VNO_ = 1VRMS, f = 10MHz, Figure 5 +25°C 4-channel mode 180 -3dB Bandwidth BW Figure 5 -0.1dB Bandwidth BW Figure 5 A_, EN to LE Rise Setup Time tDS Figure 6 C, E 80 ns A_, EN to LE Rise Hold Time tDH Figure 6 C, E 0 ns LE Low Pulse Width tL Figure 6 C, E 80 ns RS Low Pulse Width tRS Figure 6 C, E 80 ns Operating Frequency fCLK Figure 7 C, E SCLK Pulse Width High tCH Figure 7 C, E 80 ns SCLK Pulse Width Low tCL Figure 7 C, E 80 ns DIN to SCLK Rise Setup Time tDS Figure 7 C, E 60 ns DIN to SCLK Rise Hold Time tDH Figure 7 C, E 0 ns tCSS0 Figure 7 C, E 50 CL = 50pF, Figure 7 C, E 8-channel mode 4-channel mode 8-channel mode +25°C MHz 140 16 +25°C MHz 11 PARALLEL-INTERFACE TIMING PARALLEL MODE INPUT TIM- SERIAL-INTERFACE SERIAL PERIPHERAL TIMING INTER- CS Fall to SCLK Rise Setup Time SCLK Rise to DOUT Valid tDO 6.25 MHz ns 150 ns CS Rise to SCLK Rise Hold Time tCSH1 Figure 7 C, E 0 ns CS Rise to SCLK Rise Setup Time tCSS1 Figure 7 C, E 80 ns CS Fall to SCLK Rise Hold Time tCSS1 Figure 7 C, E 80 ns tRS Figure 6 C, E 80 ns RS Low Pulse Width _______________________________________________________________________________________ 3 MAX4588 ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) MAX4588 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 = +25°C, V+ = VL = +5V, V- = -5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS POWERSUPPLY SUPPLY POWER Power-Supply Range V+, V- ±2.7 ±6 VL 2.7 V+ V+ Supply Current I+ V+ = 5.5V, V- = -5.5V V - Supply Current I- V+ = 5.5V, V- = -5.5V V+ = 5.5V VL Supply Current IL VL = 5.5V, all VIN_ = 0 or VL +25°C -1 C, E -10 +25°C -1 C, E -10 C, E -10 0.0001 1 10 0.0001 1 10 2 10 V µA µA µA 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 = +25°C, V+ = VL = +5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS V+ V 120 Ω ANALOG ANALOG SWITCH Analog Signal Range (Note 3) On-Resistance On-Resistance Match Between Channels (Note 4) VCOM_, VNO_ 0 RON V+ = 5V, VNO_ = 3V, ICOM_ = 4mA ∆RON V+ = 5V, VNO_ = 3V, ICOM_ = 4mA +25°C 80 C, E 150 +25°C 1 C, E 8 10 On-Resistance Flatness (Note 5) RFLAT(ON) COM_ = 4mA, V+ = 5V, ICOM_ VNO_ = 2V, 3V, 4V +25°C 4 NO_ Off Leakage Current (Notes 6, 9) INO_(OFF) V+ = 5.5V; VCOM_ = 4.5V, 1V; VNO_ = 1V, 4.5V +25°C -1 C, E -10 COM_ Off Leakage Current (Notes 6, 9) ICOM(OFF) V+ = 5.5V; VCOM_ = 4.5V, 1V; VNO_ = 1V, 4.5V +25°C -2 C, E -20 COM_ On Leakage Current (Notes 6, 9) ICOM_(ON) V+ = 5.5V; VCOM_ = 4.5V, 1V; VNO_ = 4.5V, 1V, or floating +25°C -2 C, E -20 2.4 C, E 10 12 0.005 1 10 0.005 2 20 0.005 2 20 Ω Ω nA nA nA LOGIC INPUTS INPUTS(Pins (4/8, 11 RS,through LE/CS, A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR) Input Logic Threshold High VINH C, E Input Logic Threshold Low VINL C, E 1.5 Input Threshold Hysteresis Input Current 1.7 V 0.8 0.2 IIN VIN = 0 or VL C, E -1 V V 1 µA 0.4 V LOGIC LOGIC OUTPUT OUTPUT (SERIAL (SERIAL INTERFACE) DOUT Logic Low Output VOL ISINK = 3.2mA C, E DOUT Logic High Output VOH ISOURCE = -1mA C, E 4 VL - 1 _______________________________________________________________________________________ V Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer (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 = +25°C, V+ = VL = +5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS SWITCH DYNAMIC DYNAMICCHARACCHARACTERISTICS SWITCH Turn-On Time tON VNO_ = 3V, V+ = 4.5V, Figure 1 Turn-Off Time tOFF VNO_ = 3V, V+ = 4.5V, Figure 1 Break-Before-Make Time Delay (Note 3) tBBM VNO_ = 3V, V+ = 5.5V, Figure 2 Charge Injection Q +25°C 550 C, E +25°C 150 C, E C, E 800 900 300 350 10 ns ns 200 ns CL = 1.0nF, VNO_ = 2.5V, RS = 0, Figure 3 +25°C 5 pC -65 dB -70 dB Off-Isolation VISO VNO_ = 1VRMS, f = 10MHz, all channels off, Figure 5 +25°C Channel-to-Channel Crosstalk VCT VNO_ = 1VRMS, f = 10MHz, Figure 5 +25°C 4-channel mode -3dB Bandwidth BW Figure 5 -0.1dB Bandwidth BW Figure 5 A_, EN to LE Rise Setup Time tDS Figure 6 C, E A_, EN to LE Rise Hold Time 8-channel mode 4-channel mode 8-channel mode 100 +25°C MHz 75 10 +25°C MHz 7 PARALLEL-INTERFACE PARALLEL MODE INPUT TIMING TIM80 ns tDH Figure 6 C, E 0 ns LE Low Pulse Width tL Figure 6 C, E 80 ns RS Low Pulse Width tRS Figure 6 C, E 80 ns Operating Frequency fCLK Figure 7 C, E SCLK Pulse Width High tCH Figure 7 C, E 80 ns SCLK Pulse Width Low tCL Figure 7 C, E 80 ns DIN to SCLK Rise Setup Time tDS Figure 7 C, E 60 ns DIN to SCLK Rise Hold Time tDH Figure 7 C, E 0 ns CS Fall to SCLK Rise Setup Time tCSS0 Figure 7 C, E 50 ns CS Fall to SCLK Rise Hold Time tCSS1 Figure 7 C, E 80 ns CS Rise to SCLK Rise Hold Time tCSH1 Figure 7 C, E 0 ns CS Rise to SCLK Rise Setup Time tCSS1 Figure 7 C, E 80 ns SERIAL-INTERFACE SERIAL PERIPHERAL TIMING INTER- SCLK Rise to DOUT Valid tDO CL = 50pF, Figure 7 C, E RS Low Pulse Width tRS Figure 6 C, E 6.25 150 80 MHz ns ns _______________________________________________________________________________________ 5 MAX4588 ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued) MAX4588 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 = +25°C, V+ = VL = +5V.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS POWERSUPPLY SUPPLY POWER V+ Power-Supply Range VL V+ ≤ 6.5V V+ > 6.5V V+ Supply Current I+ V+ = 5.5V, VIN = 0 or VL VL Supply Current IL VL = 5.5V, all VIN_ = 0 or VL 2.7 12 2.7 V+ 2.7 6.5 +25°C -1 1 C, E -10 10 C, E -10 2 10 V µA µA 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 = +25°C, V+ = VL = +3.0V.) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS V+ V 350 Ω ANALOG SWITCH SWITCH ANALOG Analog Signal Range On-Resistance VCOM_, VNO_ RON 0 V+ = 2.7V, VNO_ = 1V, ICOM_ = 1mA +25°C 240 C, E 450 LOGIC INPUT (Pins through INPUTS (4/8,11RS, LE/CS, A2/SCLK, A1/DIN, A0/DOUT, EN, SER/PAR) Input Logic Threshold High VINH C, E Input Logic Threshold Low VINL C, E Input Current IIN VIN_ = 0 or VL C, E 2.0 V -1 0.5 V 1 µA SWITCH DYNAMIC DYNAMICCHARACCHARACTERISTICS SWITCH Turn-On Time tON VNO_ = 1.5V, V+ = 2.7V, Figure 1 Turn-Off Time tOFF VNO_ = 1.5V, V+ = 2.7V, Figure 1 Break-Before-Make Time Delay (Note 3) tBBM VNO_ = 1.5V, V+ = 3.6V, Figure 2 +25°C 700 C, E 1000 200 +25°C 250 C, E 400 500 350 ns ns +25°C 10 ns 200 ns PARALLEL-INTERFACE PARALLEL MODE INPUT TIMING TIMA_, EN to LE Rise Setup Time tDS Figure 6 C, E A_, EN to LE Rise Hold Time tDH Figure 6 C, E 0 ns LE Low Pulse Width tL Figure 6 C, E 200 ns RS Low Pulse Width tRS Figure 6 C, E 200 ns Operating Frequency fCLK Figure 7 C, E SCLK Pulse Width High tCH Figure 7 C, E 200 ns SCLK Pulse Width Low tCL Figure 7 C, E 200 ns DIN to SCLK Rise Setup Time tDS Figure 7 C, E 100 ns DIN to SCLK Rise Hold Time tDH Figure 7 C, E 0 ns RS Low Pulse Width tRS Figure 6 C, E 200 ns SERIAL-INTERFACE SERIAL PERIPHERAL TIMING INTER- 6 2.1 _______________________________________________________________________________________ MHz Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer (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 = +25°C, V+ = VL = +3.0V.) PARAMETER SYMBOL TA MIN CS Fall to SCLK Rise Setup Time tCSS0 Figure 7 C, E 100 ns CS Rise to SCLK Rise Hold Time tCSH1 Figure 7 C, E 0 ns CS Rise to SCLK Rise Setup Time tCSS1 Figure 7 C, E 200 ns CS Fall to SCLK Rise Hold Time tCSS1 Figure 7 C, E 200 ns CL = 50pF, Figure 7 C, E SCLK Rise to DOUT Valid tDO CONDITIONS TYP MAX 250 UNITS ns POWERSUPPLY SUPPLY POWER V+ Supply Current I+ V+ = 3.6V, VIN = 0 or VL VL Supply Current IL VL = 3.6V, all VIN = 0 or VL Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: +25°C -1 1 C, E -10 10 C, E -10 1 10 µA µA 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 = +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. _______________________________________________________________________________________ 7 MAX4588 ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued) Typical Operating Characteristics (V+ = VL = +5V, V- = -5V, TA = +25°C, unless otherwise noted.) ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) 250 ±2.5V ON-RESISTANCE (Ω) ON-RESISTANCE (Ω) ±3V 60 ±4V 50 ±5V 40 30 ±6V V- = 0 V+ = +2.5V 200 80 70 20 150 V+ = +3.0V V+ = +3.6V 100 V+ = +5V V+ = +9V 50 10 V+ = +12V 0 0 -6 -4 -2 0 2 4 0 6 4 8 6 10 12 VCOM (V) ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) V- = 0 130 120 55 TA = +85°C 50 TA = +50°C 45 TA = +25°C 40 TA = 0°C 35 ON-RESISTANCE (Ω) 60 MAX4588-04 140 MAX4588-03 65 ON-RESISTANCE (Ω) 2 VCOM (V) 70 TA = -40°C 30 25 110 TA = +85°C 100 TA = +50°C 90 TA = +25°C 80 70 TA = 0°C 60 TA = -40°C 50 20 40 -5 -4 -3 -2 -1 0 1 2 3 4 5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCOM (V) VCOM (V) ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE CHARGE INJECTION vs. VCOM 30 CHARGE INJECTION (pC) 1n 100p ON-LEAKAGE 10p OFF-LEAKAGE 1p MAX4588-06 35 MAX4588-05 10n 25 DUAL SUPPLIES 20 15 10 SINGLE SUPPLY 5 0 0.1p -40 -20 0 20 40 60 TEMPERATURE (°C) 8 MAX4588-02 90 MAX4588-01 100 LEAKAGE CURRENT (A) MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer 80 100 120 -5 -4 -3 -2 -1 0 1 2 3 VCOM (V) _______________________________________________________________________________________ 4 5 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer ON/OFF TIME vs. TEMPERATURE tON 200 300 200 tOFF tOFF 100n 10n 1n 100p I+ 100 100 I- 10p 0 0 3.0 3.5 4.0 4.5 5.0 5.5 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 6.0 10 0 ON LOSS 40 10 0 AMPLITUDE (dB) RS = 75Ω RL = 600Ω -30 20 60 80 100 120 INSERTION LOSS, OFF-ISOLATION, AND CROSSTALK vs. FREQUENCY (SINGLE SUPPLY) INSERTION LOSS -10 -20 0 TEMPERATURE (°C) INSERTION LOSS, OFF-ISOLATION, AND CROSSTALK vs. FREQUENCY (DUAL SUPPLIES) -10 1p -40 -20 TEMPERATURE (°C) SUPPLY VOLTAGE (±V) MAX4588-10 2.5 -40 -50 -60 MAX4588-11 300 IL 1µ SUPPLY CURRENT (A) tON, tOFF (ns) 400 10µ MAX4588-08 MAX4588-07 400 tON AMPLITUDE (dB) tON, tOFF (ns) 500 SUPPLY CURRENT vs. TEMPERATURE 500 MAX4588-09 ON/OFF TIME vs. SUPPLY VOLTAGE 600 -20 RS = 75Ω RL = 600Ω -30 -40 -50 CROSSTALK -60 OFF-ISOLATION -70 -70 CROSSTALK -80 OFF-ISOLATION -80 -90 -90 100k 1M 10M FREQUENCY (Hz) 100M 1G 100k 1M 10M 100M 1G FREQUENCY (Hz) _______________________________________________________________________________________ 9 MAX4588 Typical Operating Characteristics (continued) (V+ = VL = +5V, V- = -5V, TA = +25°C, unless otherwise noted.) MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer Pin Description PIN NAME 1, 5, 7, 9, 21, 23, 25 GND 2 COM1 3 V+ 4 NO1 Normally Open Analog Input Terminal. See Truth Tables. 6 NO2 Normally Open Analog Input Terminal. See Truth Tables. 8 NO3 Normally Open Analog Input Terminal. See Truth Tables. 10 NO4 Normally Open Analog Input Terminal. See Truth Tables. 11 4/8 Multiplexer Configuration Control. Connect to VL to select dual 2-channel mode. Connect to GND for single 4-channel multiplexer operation. See Truth Tables. 12 RS 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. 13 LE/CS 14 A2/SCLK 15 A1/DIN 16 A0/DOUT 17 EN 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. 18 SER/PAR Interface Select Input. Drive low for parallel data interface operation. Drive high for serial data interface operation and to enable the DOUT driver. 19 VL Logic Supply Input. Powers the DOUT driver and other digital circuitry. VL sets both the digital input and output logic levels. 20 NO8 Normally Open Analog Input Terminal. See Truth Tables. 22 NO7 Normally Open Analog Input Terminal. See Truth Tables. 24 NO6 Normally Open Analog Input Terminal. See Truth Tables. 26 NO5 Normally Open Analog Input Terminal. See Truth Tables. 27 V- 28 COM2 10 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 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. Analog Negative Supply Voltage Input. Connect to ground plane for single-supply operation. Analog Switch Common Terminal. See Truth Tables. ______________________________________________________________________________________ Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588 V+ V+ LE/CS NO_ EN VNO_ 50% 50% MAX4588 EN COM_ 90% VOUT 300Ω 30pF GND V- 90% VOUT tOFF tON V- Figure 1. Turn-On/Turn-Off Time V+ V+ NO_ LE/CS A0 NO_ SER/PAR VNO_ VOUT MAX4588 A0 90% VOUT COM_ 300Ω 30pF GND GND V- tBBM V- Figure 2. Break-Before-Make Time Delay V+ V+ LE/CS NO_ VNO_ 1nF SER/PAR 10µF EN VOUT VOUT MAX4588 EN COM_ CL GND V- ∆VOUT Q = ∆VOUT · CL V∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Figure 3. Charge Injection ______________________________________________________________________________________ 11 MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer V+ FLOATING NO_ V+ NO_ 1MHz CAPACITANCE ANALYZER MAX4588 MAX4588 FLOATING COM_ COM_ 1MHz CAPACITANCE ANALYZER GND V- GND V- Figure 4. NO_, COM_ Capacitance V+ V+ NO_ 50Ω 49.9Ω 56Ω MAX4588 + - NO_ MEASURE NODE 24.9Ω 50Ω V- COM_ MEASURE NODE 560Ω 50Ω VALL 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 12 ______________________________________________________________________________________ Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer MAX4588 CS tCSS tCH tCL tCSH MAX4588 SCLK tDS tDH DIN A0 A1 A2 DISABLE tDO 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 NORMALLY OPEN SWITCH CONSTRUCTION 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. N1 COM_ N2 P1 NO_ P2 V+ VCC A1 A2 INPUT A3 N3 GND 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. V+ VESD DIODES ON GND, NO_, AND COM_ V+ Figure 8. T-Switch Construction Typical attenuation in 75Ω 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. ______________________________________________________________________________________ 13 MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer 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. 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 75Ω 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 14 analog switches. This drive signal is the only connection between the logic supplies and the analog supplies. 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. ______________________________________________________________________________________ Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer 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- 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 0.01µF 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. 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 75Ω systems, where the inputs are terminated external to the IC and the COM terminals see an impedance of 600Ω or higher. The MAX4588 can operate in 50Ω and 75Ω 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. ______________________________________________________________________________________ 15 MAX4588 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. MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer 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 Parallel 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. 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 A2 A1 A0 EN LE RS 8 4/8 0 x x x x 1 1 x Maintain previous state. x x x x x x 0 x All switches off, latches are cleared. 1 x x x x x 1 x Serial Mode. Refer to Serial Operation Truth Table. SWITCH STATES 0 x x x 0 0 1 x All switches off. 0 0 0 0 1 0 1 0 Connects NO1 to COM1 0 0 0 1 1 0 1 0 Connects NO2 to COM1 0 0 1 0 1 0 1 0 Connects NO3 to COM1 0 0 1 1 1 0 1 0 Connects NO4 to COM1 0 1 0 0 1 0 1 0 Connects NO5 to COM2 0 1 0 1 1 0 1 0 Connects NO6 to COM2 0 1 1 0 1 0 1 0 Connects NO7 to COM2 0 1 1 1 1 0 1 0 Connects NO8 to COM2 0 x 0 0 1 0 1 1 Connect NO1 to COM1 and NO5 to COM2 0 x 0 1 1 0 1 1 Connect NO2 to COM1 and NO6 to COM2 0 x 1 0 1 0 1 1 Connect NO3 to COM1 and NO7 to COM2 0 x 1 1 1 0 1 1 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. 16 ______________________________________________________________________________________ Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer Serial Operation SER/PAR CS SCLK DIN EN RS DOUT 1 x x x x 0 0 All switches off. Latches and shift register are cleared. This is the power-on reset (POR) state. 0 x x x x x High-Z Parallel Mode. Refer to Parallel Operation Truth Table. 1 x x x 0 1 * All switches off. 1 1 x x 1 1 * Chip unselected. 1 0 0 1 1 * Input shift register loads one bit from DIN. DOUT updates on SCLK’s rising edge. 1 0 1 1 1 * Input shift register loads one bit from DIN. DOUT updates on SCLK’s rising edge. x 1 1 * Contents of shift register transferred to control latches. 1 x ON SWITCHES/STATES x = Don’t Care *DOUT is delayed by 4 clock cycles from DIN. Control Bit and 4/8 Logic DISABLE BIT A2 BIT A1 BIT A0 BIT 8 4/8 PIN ON SWITCHES/STATES 1 x x x x All switches off. 0 0 0 0 0 Connect NO1 to COM1 0 0 0 1 0 Connect NO2 to COM1 0 0 1 0 0 Connect NO3 to COM1 0 0 1 1 0 Connect NO4 to COM1 0 1 0 0 0 Connect NO5 to COM2 0 1 0 1 0 Connect NO6 to COM2 0 1 1 0 0 Connect NO7 to COM2 0 1 1 1 0 Connect NO8 to COM2 0 x 0 0 1 Connect NO1 to COM1 and NO5 to COM2 0 x 0 1 1 Connect NO2 to COM1 and NO6 to COM2 0 x 1 0 1 Connect NO3 to COM2 and NO7 to COM2 0 x 1 1 1 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). ______________________________________________________________________________________ 17 MAX4588 Truth Tables (continued) ____________________Chip Information TRANSISTOR COUNT: 1033 Package Information 28LNPDIP.EPS MAX4588 Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer 18 ______________________________________________________________________________________ Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer SOICW.EPS ______________________________________________________________________________________ 19 MAX4588 Package Information (continued) Low-Voltage, High-Isolation, Dual 4-Channel RF/Video Multiplexer SSOP.EPS MAX4588 Package Information (continued) 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 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.