19-0563; Rev 1; 11/06 Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability Features The MAX4744/MAX4744H/MAX4745/MAX4745H/ MAX4746H dual SPDT (single-pole/double-throw) audio switches feature negative signal capability that allows signals as low as VCC - 5.5V to pass through without distortion. These analog switches have a low on-resistance and low supply current, and operate from a single +1.8V to +5.5V supply. The MAX4744/MAX4744H have internal shunt resistors that automatically discharge the capacitance at the normally open (NO) and normally closed (NC) terminals when they are not connected. The MAX4746H features internal shunt resistors on NC_ terminals. This reduces click-and-pop sounds that occur when switching audio signals between precharged points. A break-beforemake feature further reduces popping. The MAX4744/ MAX4745 control the switches with two control bits CB1 and CB2. The MAX4744H/MAX4745H/MAX4746H have one control bit to switch both switches and an enable input EN to put the switches in a high-impedance mode. The MAX4744H/MAX4745H/MAX4746H also have an internal protection network against voltages applied to COM_ when VCC = 0V. These devices are available in a space-saving 10-pin DFN (2mm x 2mm) package and operate over the -40C to +85C extended temperature range. Distortion-Free Negative Signal Throughput Down to VCC - 5.5V Internal Shunt Resistor Reduces Click/Pop (MAX4744/MAX4744H) 0.6 (typ) Low On-Resistance 0.1 (max) Channel-to-Channel Matching 0.55 (max) On-Resistance Flatness +1.8V to +5.5V Single-Supply Voltage 0.01% (typ) Total Harmonic Distortion -75dB (typ) Crosstalk (100kHz) -68dB (typ) Off-Isolation (100kHz) Available in 10-Pin DFN Package (2mm x 2mm) Pin Configurations TOP VIEW COM1 NC1 VCC NC2 COM2 10 9 8 7 COM1 NC1 VCC 6 10 9 NC2 COM2 8 7 6 4 5 Applications Speaker Switching MAX4744H MAX4745H MAX4746H MAX4744 MAX4745 Power Routing + + Cellular Phones 1 MP3 Players 2 3 4 1 5 CB1 NO1 GND NO2 CB2 PDAs and Other Handheld Devices EN DFN (2mm x 2mm) Notebook Computers 2 3 NO1 GND NO2 CB0 DFN (2mm x 2mm) Ordering Information/Selector Guide PINPACKAGE TOP MARK CLICKLESS COM PROTECTION PKG CODE MAX4744ELB+T 10 DFN-10 +AAF Yes No L1022-1 MAX4744HELB+T 10 DFN-10 +AAG Yes Yes L1022-1 MAX4745ELB+T 10 DFN-10 +AAH No No L1022-1 MAX4745HELB+T 10 DFN-10 +AAI No Yes L1022-1 Yes L1022-1 PART MAX4746HELB+T 10 DFN-10 +AAM Yes, on NC_ Note: All devices are specified over the -40C to +85C operating temperature range. +Denotes a lead-free package. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H General Description MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC, CB_, EN ........................................................-0.3V to +6.0V NC_, NO_ ...........................................(VCC - 6V) to (VCC + 0.3V) COM_ (MAX4744/MAX4745).............(VCC - 6V) to (VCC + 0.3V) COM_ (MAX4744H/MAX4745H/MAX4746H) ..................(Note 1) Continuous Current NO_, NC_, COM_. ..........................300mA Peak Current NO_, NC_, COM_ (pulsed at 1ms, 50% duty cycle) ...................................................................400mA Peak Current NO_, NC_, COM_ (pulsed at 1ms, 10% duty cycle) ...................................................................500mA ESD Protection per Method 3015.7 NO_, NC_, COM_, VCC, GND, CB_, EN...............................2kV Continuous Power Dissipation (TA = +70C) 10-Pin DFN (derate 5mW/C above +70C) ...............403mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Note 1: If VCC > 0.5V, limits are (VCC - 6V) to (VCC + 0.3V). If VCC < 0.5V, limits are (VCC - 6.0V) to +6.0V. 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 (VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V POWER SUPPLY Supply-Voltage Range VCC Supply Current ICC 1.8 VCC = 5.5V, VCB_ = 0V or VCC 0.3 1 VCC = 5.5V, VCB_ = 0.5V or 1.4V 8 VCC = 2.7V, VCB_ = 0.5V or 1.4V 4 A ANALOG SWITCH Analog Signal Range VNC_, VNO_, VCOM_ RON VCC = +2.7V; VNC_ or VNO_ = VCC - 5.5V, -1V, 0V, 1V, 2V, VCC; ICOM_ = 100mA On-Resistance Match Between Channels (Notes 4 and 5) RON VCC = 2.7V, VNC_ or VNO_ = 0V, ICOM_ = 100mA On-Resistance Flatness (Note 6) RFLAT VCC = +2.7V, VNC_ or VNO_ = VCC - 5.5V, - 1V, 0V, 1V, 2V, VCC; ICOM_ = 100mA On-Resistance (Note 4) Shunt Switch Resistance NC_, NO_ Off-Leakage Current (Note 3) COM_ On-Leakage Current (Note 3) 2 RSH VCC - 5.5V (Note 3) TA = +25C VCC 0.6 0.95 TA = TMIN to TMAX 1.0 TA = +25C 0.1 TA = TMIN to TMAX 0.1 TA = +25C 0.55 TA = TMIN to TMAX 0.6 MAX4744/MAX4744H/MAX4746H only, VCC = 2.7V INO_(OFF), INC_(OFF) TA = +25C VCC = +2.7V switch open; VNC_ or VNO_ = -2.5V, +2.5V TA = TMIN to (MAX4745/MAX4745H only) TMAX (MAX4746H - INO_(OFF) only) ICOM_(ON) TA = +25C VCC = 2.7V switch closed; VNC_ or VNO_ = -2.5V, +2.5V; TA = TMIN to VCOM_ = -2.5V, +2.5V TMAX 2 5 -15 +15 -50 +50 -15 +15 -100 +100 _______________________________________________________________________________________ V k nA nA Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25C.) (Note 2) PARAMETER COM_ Leakage Under Protection Conditions SYMBOL IL(PROT) CONDITIONS VCC = 0V; VCOM_ = +5.5V; VNC_ and VNO_ are unconnected or connected to GND; VCB_ = 0V (MAX4744H/MAX4745H/ MAX4746H only) MIN TA = +25C TYP MAX UNITS 30 nA TA = TMIN to TMAX 500 DYNAMIC CHARACTERISTICS Turn-On Time tON Turn-Off Time tOFF Break-Before-Make Delay Time Power-Supply Rejection Ratio Charge Injection tD PSRR Q For NO_, VNO_ = 1.5V, VCB_ = 0V to VCC 55 For NC_, VNC_ = 1.5V, VCB_ = VCC to 0V 560 For NO_, VNO_ = 1.5V, VCB_ = VCC to 0V 540 For NC_, VNC_ = 1.5V, VCB_ = 0V to VCC 36 VCC = 2.7V, VNC_ = VNO_ = 1.5V; for NO_, VCB_ = VCC to 0V; for NC_, VCB_ = 0V to VCC; RL = 32; CL = 35pF; Figure 3 20 ns f = 100kHz, VCOM_ = 1VRMS, RL = 50, CL = 5pF 52 dB VGEN_ = 0V; RGEN = 0, CL = 1nF, Figure 4 450 pC -68 dB VCC = 2.7V, RL = 32, CL = 35pF, Figure 2 VCC = 2.7V, RL = 32, CL = 35pF, Figure 2 ns ns Off-Isolation VISO CL = 5pF; RL = 50; f = 100kHz; VCOM_ = 1VRMS; Figure 5 (Note 7) Crosstalk VCT CL = 5pF; RL = 50; f = 100kHz; VCOM_ = 1VRMS; Figure 5 -75 dB Total Harmonic Distortion THD f = 20Hz to 20kHz, VCOM_ = 0.5VP-P, RL = 50 0.01 % NO_, NC_ Off-Capacitance CNO_(OFF), f = 1MHz, Figure 6 CNC_(OFF) 90 pF COM On-Capacitance CCOM_(ON) f = 1MHz, Figure 6 300 pF _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.5 V +1 A DIGITAL INPUTS (CB_, EN) Input-Logic High VIH Input-Logic Low VIL Input Leakage Current 1.4 ILEAK VCB_ or VEN = 0V or VCC V -1 Note 2: All parameters are production tested at TA = +25C and guaranteed by design over the specified temperature range. Note 3: Signals on COM_, NO_, or NC_ exceeding VCC are clamped by internal diodes. Limit forward-diode current to maximum current ratings. Note 4: Guaranteed by design; not production tested. Note 5: RON = RON(MAX) - RON(MIN). Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Note 7: Off-isolation = 20log10[VCOM_ / VNO_], VCOM_ = output, VNO_ = input to off switch. Typical Operating Characteristics (VCC = +3.3V, TA = +25C, unless otherwise noted.) ON-RESISTANCE vs. COM VOLTAGE VCC = +3V 1.2 VCC = +1.8V VCC = +5V 0.6 TA = +85C 0.4 0.3 TA = -40C 0.2 0 -3 -2 -1 0 1 2 COM VOLTAGE (V) 3 4 5 TA = +25C 0.4 TA = +85C 0.3 0.2 TA = -40C 0.1 0 0.1 -4 VCC = 5V MAX4744 toc03 0.5 0.5 ON-RESISTANCE () 1.8 VCC = 3V TA = +25C ON-RESISTANCE () 2.4 4 0.6 MAX4744 toc01 3.0 ON-RESISTANCE vs. COM VOLTAGE MAX4744 toc02 ON-RESISTANCE vs. COM VOLTAGE ON-RESISTANCE () MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability -2.5 -1.4 -0.3 0.8 COM VOLTAGE (V) 1.9 3.0 -0.5 0.6 1.7 2.8 COM VOLTAGE (V) _______________________________________________________________________________________ 3.9 5.0 Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability NO_ TURN-ON/NC_ TURN-OFF TIME vs. TEMPERATURE NO_ TURN-ON/NC_ TURN-OFF TIME vs. SUPPLY VOLTAGE 120 TIME (ns) TIME (ns) 100 600 NC_ TURN-ON TIME 500 80 NO_ TURN-ON TIME 60 NC_ TURN-OFF TIME 400 40 240 MAX4744 toc06 700 MAX4744 toc05 140 MAX4744 toc04 800 NO_ tON TURN-ON/TURN-OFF TIME (ns) NC_ TURN-ON/NO_ TURN-OFF TIME vs. SUPPLY VOLTAGE 200 160 120 NC_ tOFF 80 40 NO_ TURN-OFF TIME 0 20 2.8 3.8 5.5 4.8 1.8 2.3 2.8 SUPPLY VOLTAGE (V) NO_ TURN-ON/NC_ TURN-OFF TIME vs. TEMPERATURE 4.3 4.8 LOGIC THRESHOLD (V) 600 NO_ tOFF 5 20 35 50 65 0.8 VCB_ FALLING 0.9 0.6 0 1.8 2.6 3.4 4.2 5.0 0 5.5 1.4 2.0 3.0 CHARGE INJECTION vs. SUPPLY VOLTAGE 600 TA = +85C TA = -40C 800 700 600 500 400 300 TA = +25C 0 0.2 1.0 DIGITAL INPUT VOLTAGE (V) CHARGE INJECTION (pC) 800 0.5 MAX4744 toc11 1000 0.1 80 0.3 COM PROTECTION LEAKAGE CURRENT vs. SUPPLY VOLTAGE 0 65 1.2 SUPPLY VOLTAGE (V) 200 50 1.5 MAX4744 toc08 1.2 TEMPERATURE (C) 400 35 SUPPLY CURRENT vs. LOGIC-INPUT VOLTAGE VCB_ RISING 80 20 LOGIC THRESHOLD vs. SUPPLY VOLTAGE MAX4744 toc10 -25 -10 5 TEMPERATURE (C) 0 -40 -25 -10 SUPPLY VOLTAGE (V) 0.4 400 -40 5.3 1.6 700 500 3.8 2.0 MAX4744 toc07 NC_ tON 800 COM PROTECTION LEAKAGE CURRENT (nA) TURN-ON/TURN-OFF TIME (ns) 900 3.3 SUPPLY CURRENT (A) 1.8 MAX4744 toc09 300 0.3 SUPPLY VOLTAGE (V) 0.4 0.5 200 1.8 2.8 3.8 SUPPLY VOLTAGE (V) 4.8 5.5 _______________________________________________________________________________________ 5 MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Typical Operating Characteristics (VCC = +3.3V, TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25C, unless otherwise noted.) LEAKAGE CURRENT vs. TEMPERATURE FREQUENCY RESPONSE MAX4744 toc13 MAX4744 toc12 0 -1 100 ON ON-LOSS (dB) LEAKAGE CURRENT (nA) 1000 10 -2 -3 -4 OFF 1.0 -5 0.1 -40 -15 10 35 60 -6 0.001 85 0.01 TEMPERATURE (C) OFF-ISOLATION vs. FREQUENCY 1 10 100 CROSSTALK vs. FREQUENCY -20 CROSSTALK (dB) -50 -60 MAX4744 toc15 0 MAX4744 toc14 -40 OFF-ISOLATION (dB) 0.1 FREQUENCY (MHz) -40 -60 -70 -80 -80 0.001 0.01 0.1 1 10 -100 0.001 100 FREQUENCY (MHz) 0.01 0.1 1 10 100 FREQUENCY (MHz) TOTAL HARMONIC DISTORTION vs. FREQUENCY MAX4744 toc17 80 MAX4744 toc16 1 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 60 PSRR (dB) 0.1 THD (%) MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability 40 0.01 20 0.001 0.01 0.1 1 FREQUENCY (kHz) 6 10 100 0 0.001 0.01 0.1 FREQUENCY (MHz) _______________________________________________________________________________________ 1 Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability PIN MAX4744/ MAX4745 MAX4744H/ MAX4745H/ MAX4746H NAME 1 -- CB1 Digital Control Input for Analog Switch 1 EN Enable Input. Driving EN high causes all switches to be high impedance. Pull EN low for normal operation. FUNCTION -- 1 2 2 NO1 Analog Switch 1--Normally Open Terminal 3 3 GND Ground 4 4 NO2 Analog Switch 2--Normally Open Terminal 5 -- CB2 Digital Control Input for Analog Switch 2 -- 5 CB0 Digital Control Input for Analog Switches 1 and 2 6 6 COM2 7 7 NC2 Analog Switch 2--Normally Closed Terminal 8 8 VCC Positive Supply Voltage from +1.8V to +5.5V 9 9 NC1 10 10 COM1 Analog Switch 2--Common Terminal Analog Switch 1--Normally Closed Terminal Analog Switch 1--Common Terminal Detailed Description The MAX4744/MAX4744H/MAX4745/MAX4745H/ MAX4746H are low on-resistance, low-voltage, dualSPDT analog switches that operate from a +1.8V to +5.5V single supply. These devices feature a negative signal capability that allows signals as low as VCC 5.5V to pass through without distortion. The MAX4744/MAX4745 feature two digital control bits to control each switch independently (see Table 1). The MAX4744H/MAX4745H/MAX4746H have one control bit to switch both switches and an enable input EN to put the switches in a high-impedance mode. Driving EN low takes the switches out of high impedance and CB0 controls both switches (see Table 2). The MAX4744/MAX4744H have internal shunt resistors on all NO and NC terminals, and the MAX4746H has internal shunt resistors on NC terminals to suppress click-and-pop sounds that can occur when switching audio signals between precharged points. Table 1. MAX4744/MAX4745 Truth Table CONTROL SWITCH STATE CB1 CB2 Switch 1 Switch 2 0 0 Connected to NC1 Connected to NC2 0 1 Connected to NC1 Connected to NO2 1 0 Connected to NO1 Connected to NC2 1 1 Connected to NO1 Connected to NO2 Table 2. MAX4744H/MAX4745H/MAX4746H Truth Table CONTROL SWITCH STATE EN CB0 Switch 1 Switch 2 0 0 Connected to NC1 Connected to NC2 0 1 Connected to NO1 Connected to NO2 1 X High Impedance High Impedance X = Don't Care Applications Information Digital Control Inputs The MAX4744/MAX4744H/MAX4745/MAX4745H/ MAX4746H logic inputs accept up to +5.5V, regardless of supply voltage. For example, with a +3.3V supply, CB0, CB1, CB2, and EN can be driven low to GND and high to +5.5V, allowing for mixed logic levels in a system. Driving CB0, CB1, CB2, and EN rail-to-rail minimizes power consumption. _______________________________________________________________________________________ 7 MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Pin Description MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability VCC MAX4744 MAX4744H NC1 NC1 COM1 SWITCH 1 VCC SWITCH 1 COM1 HIGH-Z NO1 NO1 SHUNT SWITCH CONTROL LOGIC SHUNT SWITCH CB1 CB2 NC2 EN CB0 NC2 SWITCH 2 HIGH-Z COM2 NO2 GND MAX4745 NC1 SWITCH 1 COM1 COM1 HIGH-Z NO1 GND VCC MAX4745H VCC NC1 SWITCH 1 COM2 SWITCH 2 NO2 NO1 CONTROL LOGIC CB1 CB2 EN CB0 NC2 NC2 SWITCH 2 HIGH-Z COM2 NO2 NO2 GND MAX4746H NO1 COM2 SWITCH 2 GND VCC SWITCH 1 COM1 HIGH-Z NC1 CONTROL LOGIC SHUNT SWITCH EN CB0 NC2 HIGH-Z NO2 COM2 SWITCH 2 GND Figure 1. Functional Diagram 8 _______________________________________________________________________________________ Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability MAX4744/MAX4745/ MAX4744H/MAX4745H/ MAX4746H VCC V CC COM_ NO_ OR NC_ VNC_ OR VNO_ LOGIC INPUT 50% 0V VOUT RL t OFF CL CB_ VOUT GND LOGIC INPUT SWITCH OUTPUT 0.8 x V0UT 0V 0.2 x VOUT t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE RL VOUT = VN_ RL + RON ( t r < 5ns t f < 5ns VCC IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. ) Figure 2. Switching Time V CC MAX4744/MAX4745/ MAX4744H/MAX4745H/ MAX4746H VNC_ = VNO_ LOGIC INPUT V CC 50% 0V NC_ VOUT COM_ NO_ RL CB_ LOGIC INPUT VCC CL GND 0.9 x VOUT VOUT tBBM CL INCLUDES FIXTURE AND STRAY CAPACITANCE Figure 3. Break-Before-Make Interval Analog Signal Levels These devices pass signals from V CC to as low as VCC - 5.5V, including signals below ground with minimal distortion and very little change in on-resistance (see the Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ terminals can be used as either inputs or outputs. COM_ Protection with VCC = 0V (MAX4744H/MAX4745H/MAX4746H) This feature prevents any damage to the device due to improper power-supply sequencing. The protection applies if a signal is applied on COM_ when VCC is less than 0.5V. The switch is not protected if V CC goes above 0.5V due to parasitic capacitive coupling or any leakage between COM_ and VCC. The signal at COM_ ranges between (VCC - 6.0V) to 6.0V under protection conditions. Click-and-Pop Suppression The MAX4744/MAX4744H have a shunt resistor on all their NO and NC terminals to automatically discharge any capacitance when they are not connected to COM. The shunt resistor reduces audible click-and-pop sounds that occur when switching between audio sources. Audible clicks and pops are caused when a step DC voltage is switched into the speaker. The DC step transients can be reduced by automatically discharging the side that is not connected to the COM terminal, reducing any residual DC voltage and reducing clicks and pops. _______________________________________________________________________________________ 9 MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Test Circuits/Timing Diagrams MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability Test Circuits/Timing Diagrams V CC MAX4744/MAX4745/ MAX4744H/MAX4745H/ MAX4746H VOUT VCC COM_ VOUT NC_ OR NO_ VOUT CB_ OFF CL GND ON OFF CB_ VIL TO VIH ON OFF CB_ OFF Q = (V OUT )(C L ) LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. Figure 4. Charge Injection VCC 10nF NETWORK ANALYZER 0V OR VCC VIN CB_ VCC 50 50 OFF-ISOLATION = 20log COM_ OFF-LOSS = 20log MAX4744 MAX4744H NC_ MAX4746H VOUT NO_ CROSSTALK = 20log MEAS REF VOUT VIN VOUT VIN VOUT VIN GND 50 50 MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AND OPEN AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ OR NC_ TERMINALS. ON-LOSS IS MEASURED BETWEEN COM_ AND ON NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. Figure 5. Off-Isolation, On-Loss, and Crosstalk Break-Before-Make Switching All devices feature break-before-make switching, which is configured to break (open) the first set of contacts before engaging (closing) the new contacts. This prevents the momentary connection of the old and new signal paths to the output, reducing click-and-pop sounds. 10 Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the Absolute Maximum Ratings since stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Improper supply sequencing can force the switch into latch-up, causing it to draw excessive supply current. The only way out of latch-up is to recycle the power and reapply properly. Connect all ground pins first, then apply power to VCC, and finally apply signals to NO_, NC_, and COM_. Follow the reverse order upon power-down. ______________________________________________________________________________________ Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability 10nF MAX4744 COM_ CAPACITANCE ANALYZER MAX4744 MAX4744H MAX4745 MAX4745H MAX4746H NC1 MAXIM DirectDriveTM AUDIO AMP CB_ COM1 NO1 VIL OR VIH NC_ OR NO_ f = 1MHz GND CB1 SHUNT SWITCH CB2 Figure 6. Channel Off-/On-Capacitance NC2 Chip Information AUDIO COM2 NO2 PROCESS: BiCMOS ______________________________________________________________________________________ 11 MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Typical Operating Circuit VCC Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) A D XXXX XXXX XXXX b e 6, 8, 10L UDFN.EPS MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability N SOLDER MASK COVERAGE E PIN 1 0.10x45 L L1 1 SAMPLE MARKING PIN 1 INDEX AREA A A (N/2 -1) x e) 7 CL CL b L A A2 L e EVEN TERMINAL A1 e ODD TERMINAL PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm 21-0164 -DRAWING NOT TO SCALE- A 1 2 COMMON DIMENSIONS MAX. SYMBOL MIN. NOM. A 0.70 0.75 A1 0.15 0.20 0.25 A2 0.020 0.025 0.035 D 1.95 2.00 E 1.95 2.00 L 0.30 0.40 L1 0.80 - 2.05 2.05 0.50 0.10 REF. PACKAGE VARIATIONS PKG. CODE N e b (N/2 -1) x e L622-1 6 0.65 BSC 0.300.05 1.30 REF. L822-1 8 0.50 BSC 0.250.05 1.50 REF. L1022-1 10 0.40 BSC 0.200.03 1.60 REF. PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm -DRAWING NOT TO SCALE- 21-0164 A 2 2 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products CARDENAS is a registered trademark of Maxim Integrated Products, Inc.