Low-Voltage, Dual SPDT, Audio Clickless Switches With Negative Rail Capability

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1 19-563; Rev ; 5/6 Low-Voltage, Dual SPDT, Audio Clickless General Description The dual SPDT (single pole/double throw) audio switches feature negative signal capability that allows signals as low as - 5.5V to pass through without distortion. These analog switches have a low on-resistance, 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. This reduces click-and-pop sounds that occur when switching audio signals between pre-charged points. A break-before-make feature further reduces popping. The MAX4744/MAX4745 control the switches with two control bits CB1 and CB2. The MAX4744H/MAX4745H 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 also have an internal protection network against voltages applied to COM_ when = V. These devices are available in a space-saving 1-pin µdfn (2mm x 2mm) package and operate over the -4 C to +85 C extended temperature range. Speaker Switching Power Routing Cellular Phones MP3 Players PDAs and other Handheld Devices Notebook Computers Applications Features Distortion-Free Negative Signal Throughput Down to - 5.5V Internal Shunt Resistor Reduces Click/Pop (MAX4744/MAX4744H).6Ω (typ) Low On-Resistance.1Ω (max) Channel-to-Channel Matching.55Ω (max) On-Resistance Flatness +1.8V to +5.5V Single-Supply Voltage.1% (typ) Total Harmonic Distortion -75dB (typ) Crosstalk (1kHz) -68dB (typ) Off-Isolation (1kHz) Available in 1-pin µdfn Package (2mm x 2mm) TOP VIEW COM1 NC1 NC2 COM MAX4744 MAX CB1 NO1 NO2 CB2 μdfn (2mm x 2mm) Pin Configurations COM1 NC1 NC2 COM MAX4744H MAX4745H EN NO1 NO2 CB μdfn (2mm x 2mm) Ordering Information PART PIN- PACKAGE TOP MARK CLICKLESS COM PROTECTION PKG CODE MAX4744ELB+T 1 µdfn-1 +AAF Yes No L122-1 MAX4744HELB+T 1 µdfn-1 +AAG Yes Yes L122-1 MAX4745ELB+T 1 µdfn-1 +AAH No No L122-1 MAX4745HELB+T 1 µdfn-1 +AAI No Yes L122-1 Note: All devices are specified over the -4 C to +85 C operating temperature range. +Denotes lead-free package. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS (All voltages referenced to.),, EN...-.3V to +6.V NC_, NO_...( - 6V) to ( +.3V) COM_ (MAX4744/MAX4745)...( - 6V) to ( +.3V) COM_ (MAX4744H/MAX4745H)...(Note 1) Continuous Current NO_, NC_, COM_....±3mA Peak Current NO_, NC_, COM_ (Pulsed at 1ms, 5% Duty Cycle)...±4mA Peak Current NO_, NC_, COM_ (Pulsed at 1ms, 1% Duty Cycle)...±5mA ESD Protection per Method NO_, NC_, COM_,,,, EN...±2kV Continuous Power Dissipation (T A = +7 C) 1-Pin µdfn (derate 5mW/ C above +7 C)...43mW Operating Temperature Range...-4 C to +85 C Storage Temperature Range C to +15 C Note 1: If >.5V, limits are ( - 6V) to ( +.3V). If <.5V, limits are ( - 6.V) to +6.V. 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 ( = +2.7V to +5.5V, T A = -4 C to +85 C, unless otherwise noted. Typical values are at = 3.3V, T A = +25 C.) (Note 2) POWER SUPPLY PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply-Voltage Range V = 5.5V, V CB _ = V or.3 1 Supply Current I CC = 5.5V, V CB _ =.5V or 1.4V 8 = 2.7V, V =.5V or 1.4V 4 ANALOG SWITCH Analog Signal Range (Note 3) V NC _, V NO _, V COM _, On-Resistance (Note 4) R ON = - 5.5V, -1V, V, 1V, = 2.7V; V NC_ or V NO _ 2V, ; I COM_ = 1mA On-Resistance Match Between Channels (Notes 4 and 5) ΔR ON V C C = 2.7V, V N C _ or V N O _ = V, I C OM _ = 1m A On-Resistance Flatness (Note 6) R FLAT V C C - 5.5V, - 1V, V, 1V, 2V, V C C = 2.7V, V N C _ or V N O _ = V C C ; I C OM _ = 1m A - 5.5V T A = +25 C.6.95 T A = T MIN to T MAX 1. T A = +25 C.1 T A = T MIN to T MAX.1 T A = +25 C.55 T A = T MIN to T MAX.6 Shunt Switch Resistance R SH MAX4744/MAX4744H only, = 2.7V 2 5 kω NC_, NO_ Off-Leakage Current (Note 3) COM_ On-Leakage Current (Note 3) I NO_(OFF), I NC_(OFF) I COM_(ON) = 2.7V switch open; V NC_ or V NO _ = -2.5, +2.5V (MAX4745/MAX4745H only) = 2.7V switch closed; V NC_ or V NO _ = -2.5, +2.5V; V COM _ = -2.5, +2.5V T A = +25 C T A = T MIN to T MAX T A = +25 C T A = T MIN to T MAX µa V Ω Ω Ω na na 2

3 ELECTRICAL CHARACTERISTICS (continued) ( = +2.7V to +5.5V, T A = -4 C to +85 C, unless otherwise noted. Typical values are at = 3.3V, T A = +25 C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS COM_ Leakage Under Protection Conditions DYNAMIC CHARACTERISTICS I L(PROT) = V; V COM _ = +5.5V; V NC _ and V NO _ are unconnected or connected to ; V CB _ = V (MAX4744H/MAX4745H only) T A = +25 C 3 T A = T MIN to T MAX 5 For N O_, V N O_ = 1.5V, V C C = 2.7V, 55 V C B_ = V to V C C Turn-On Time t ON R L = 32Ω, C L = 35p F, Fi g ur e 2 For N C _, V N C _ = 1.5V, 56 V C B_ = V C C to V Turn-Off Time t OFF 32Ω, C L = 35pF, = 2.7V, R L = For N O_, V N O_ = 1.5V, V C B_ = V C C to V 54 Figure 2 For N C _, V N C _ = 1.5V, V C B_ = V to V C C 36 Break-Before-Make Delay Time t D V CB _ = to V; for NC_, V CB _ = V to = 2.7V, V NC _ = V NO_ = 1.5V; for NO_, ; R L = 32Ω; C L = 35pF; Figure 3 Power-Supply Rejection Ratio PSRR f = 1kHz, V COM _ = 1V RMS, R L = 5Ω, C L = 5pF na ns ns 2 ns 52 db Charge Injection Q V GEN _ = V; R GEN = Ω, C L = 1nF, Figure 4 45 pc Off-Isolation (Note 7) V ISO C L = 5pF; R L = 5Ω; f = 1kHz; V COM _ = 1V RMS ; Figure 5 Crosstalk V CT C L = 5pF; R L = 5Ω; f = 1kHz; V COM _ = 1V RMS ; Figure 5 Total Harmonic Distortion NO_, NC_ Off-Capacitance THD f = 2Hz to 2kHz, V COM_ =.5V P-P, R L = 5Ω -68 db -75 db.1 % C NO_(OFF), C NC_(OFF) f = 1MHz, Figure 6 9 pf COM On-Capacitance C COM_(ON) f = 1MHz, Figure 6 3 pf 3

4 ELECTRICAL CHARACTERISTICS (continued) ( = +2.7V to +5.5V, T A = -4 C to +85 C, unless otherwise noted. Typical values are at = 3.3V, T A = +25 C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS (, EN) Input-Logic High V IH 1.4 V Input-Logic Low V IL.5 V Input Leakage Current I LEAK V CB _ or V EN = V or µa Note 2: All parameters are production tested at T A = +25 C and guaranteed by design over the specified temperature range. Note 3: Signals on COM_, NO_, or NC_ exceeding are clamped by internal diodes. Limit forward-diode current to maximum current ratings. Note 4: Guaranteed by design; not production tested. Note 5: ΔR ON = R ON(MAX) - R ON(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 = 2log 1 [VC OM_ /V NO_ ], V COM_ = output, V NO_ = input to off switch. ( = +3.3V, T A = +25 C, unless otherwise noted.) ON-RESISTANCE (Ω) ON-RESISTANCE vs. COM VOLTAGE = +1.8V = +3V = +5V COM VOLTAGE (V) MAX4744 toc1 ON-RESISTANCE (Ω) = 3V ON-RESISTANCE vs. COM VOLTAGE T A = +85 C T A = +25 C T A = -4 C COM VOLTAGE (V) Typical Operating Characteristics MAX4744 toc2 ON-RESISTANCE (Ω) = 5V ON-RESISTANCE vs. COM VOLTAGE T A = +85 C T A = +25 C T A = -4 C COM VOLTAGE (V) MAX4744 toc3 4

5 ( = +3.3V, T A = +25 C, unless otherwise noted.) TIME (ns) TURN-ON/TURN-OFF TIME (ns) NC_ TURN-ON/NO_ TURN-OFF TIME vs. SUPPLY VOLTAGE NC_ TURN-ON TIME NO_ TURN-OFF TIME SUPPLY VOLTAGE (V) NO_ TURN-ON/NC_ TURN-OFF TIME vs. TEMPERATURE TEMPERATURE ( C) COM PROTECTION LEAKAGE CURRENT (na) NC_ t ON NO_ t OFF MAX4744 toc4 5.5 MAX4744 toc7 TIME (ns) LOGIC THRESHOLD (V) COM PROTECTION LEAKAGE CURRENT vs. SUPPLY VOLTAGE T A = -4 C T A = +25 C T A = +85 C NO_ TURN-ON/NC_ TURN-OFF TIME vs. SUPPLY VOLTAGE NO_ TURN-ON TIME NC_ TURN-OFF TIME SUPPLY VOLTAGE (V) LOGIC THRESHOLD vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) MAX4744 toc1 V RISING V FALLING Typical Operating Characteristics CHARGE INJECTION (pc) MAX4744 toc5 MAX4744 toc8 5.5 TURN-ON/TURN-OFF TIME (ns) SUPPLY CURRENT (μa) NO_ TURN-ON/NC_ TURN-OFF TIME vs. TEMPERATURE NO_ t ON NC_ t OFF TEMPERATURE ( C) SUPPLY CURRENT vs. LOGIC-INPUT VOLTAGE DIGITAL INPUT VOLTAGE (V) CHARGE INJECTION vs. SUPPLY VOLTAGE MAX4744 toc11 MAX4744 toc6 MAX4744 toc SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) 5.5 5

6 Typical Operating Characteristics (continued) ( = +3.3V, T A = +25 C, unless otherwise noted.) LEAKAGE CURRENT (na) OFF-ISOLATION (db) OFF-ISOLATION vs. FREQUENCY LEAKAGE CURRENT vs. TEMPERATURE ON OFF TEMPERATURE ( C) FREQUENCY (MHz) TOTAL HARMONIC DISTORTION vs. FREQUENCY MAX4744 toc12 MAX4744 toc14 MAX4744 toc16 ON-LOSS (db) CROSSTALK (db) CROSSTALK vs. FREQUENCY FREQUENCY RESPONSE FREQUENCY (MHz) FREQUENCY (MHz) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX4744 toc13 MAX4744 toc17 MAX4744 toc15 THD (%).1 PSRR (db) FREQUENCY (khz) FREQUENCY (MHz) 6

7 MAX4744/ MAX4745 PIN MAX4744H/ MAX4745H NAME 1 CB1 Digital Control Input for Analog Switch 1 Detailed Description The are low on-resistance, low-voltage, dual-spdt 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 - 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 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 CB controls both switches (see Table 2). The MAX4744/MAX4744H have internal shunt resistors on all NO and NC terminals to suppress click-and-pop sounds that can occur when switching audio signals between pre-charged points. Applications Information Digital Control Inputs The logic inputs accept up to +5.5V, regardless of supply voltage. For example, with a +3.3V supply, CB, CB1, CB2, and EN can be driven low to and high to +5.5V, allowing for mixed logic levels in a system. FUNCTION Pin Description 1 EN Enable Input. Driving EN high causes all switches to be high impedance. Pull EN low for normal operation. 2 2 NO1 Analog Switch 1 Normally Open Terminal 3 3 Ground 4 4 NO2 Analog Switch 2 Normally Open Terminal 5 CB2 Digital Control Input for Analog Switch 2 5 CB Digital Control Input for Analog Switches 1 and COM2 Analog Switch 2 Common Terminal 7 7 NC2 Analog Switch 2 Normally Closed Terminal 8 8 Positive Supply Voltage from +1.8V to +5.5V 9 9 NC1 Analog Switch 1 Normally Closed Terminal 1 1 COM1 Analog Switch 1 Common Terminal Table 1. MAX4744/MAX4745 Truth Table CONTROL SWITCH STATE CB1 CB2 Switch 1 Switch 2 Connected to NC1 Connected to NC2 1 Connected to NC1 Connected to NO2 1 Connected to NO1 Connected to NC2 1 1 Connected to NO1 Connected to NO2 Table 2. MAX4744H/MAX4745H Truth Table CONTROL SWITCH STATE EN CB Switch 1 Switch 2 Connected to NC1 Connected to NC2 1 Connected to NO1 Connected to NO2 1 X High Impedance High Impedance X = Don t Care Driving CB, CB1, CB2, and EN rail-to-rail minimizes power consumption. 7

8 NC1 NO1 SHUNT SWITCH NC2 NO2 NC1 NO1 NC2 NO2 Figure 1. Functional Diagram SWITCH 1 SWITCH 2 MAX4744 SWITCH 1 SWITCH 2 MAX4745 CB1 CB2 Analog Signal Levels These devices pass signals from to as low as - 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 = V (MAX4744H/MAX4745H) 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 is less COM1 CB1 CB2 COM2 COM1 COM2 NC1 NO1 SHUNT SWITCH NC2 NO2 NC1 NO1 NC2 NO2 Hi Z Hi Z Hi Z Hi Z MAX4744H MAX4745H CONTROL LOGIC SWITCH 1 CONTROL LOGIC SWITCH 1 SWITCH 2 SWITCH 2 EN CB EN CB than.5v. The switch is not protected if goes above.5v due to parasitic capacitive coupling or any leakage between COM_ and. The signal at COM_ ranges between - 6.V to 6.V 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 COM1 COM2 COM1 COM2 8

9 MAX4744/MAX4745/ MAX4744H/MAX4745H V NC_ OR V NO_ LOGIC INPUT Figure 2. Switching Time MAX4744/MAX4745/ MAX4744H/MAX4745H V NC_ = V NO_ LOGIC INPUT NO_ OR NC_ COM_ C L INCLUDES FIXTURE AND STRAY CAPACITANCE = V N_ ( R L R L + R ON ) NC_ NO_ 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. 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. Figure 3. Break-Before-Make Interval COM_ C L INCLUDES FIXTURE AND STRAY CAPACITANCE R L R L C L C L Test Circuits/Timing Diagrams LOGIC INPUT SWITCH OUTPUT LOGIC INPUT V V V 5% t ON tr < 5ns tf < 5ns 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, and finally apply signals to NO_, NC_, and COM_. Follow the reverse order upon power-down. t OFF.8 x V UT.2 x IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. 5% t BBM.9 x 9

10 MAX4744/MAX4745/ MAX4744H/MAX4745H Figure 4. Charge Injection V OR NC_ COM_ 1nF MAX4744 MAX4744H COM_ NC_ OR NO_ V IL TO V IH NO_ C L VOUT 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 V IN MEAS NETWORK ANALYZER 5Ω 5Ω 5Ω Test Circuits/Timing Diagrams OFF OFF REF 5Ω ON ON Q = (Δ )(C L ) Δ OFF OFF LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. OFF-ISOLATION = 2log OFF-LOSS = 2log CROSSTALK = 2log V IN V IN V IN 1

11 CAPACITANCE ANALYZER f = 1MHz 1nF COM_ NC_ OR NO_ Figure 6. Channel Off-/On-Capacitance PROCESS: BiCMOS MAX4744 MAX4744H MAX4745 MAX4745H V IL OR V IH Chip Information MAXIM Direct Drive AUDIO AMP AUDIO Typical Operating Circuit NC1 NO1 NC2 NO2 MAX4744 SHUNT SWITCH COM1 CB1 CB2 COM2 11

12 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 D XXXX XXXX XXXX PIN 1 INDEX AREA -DRAWING NOT TO SCALE- SAMPLE MARKING 7 A1 COMMON DIMENSIONS SYMBOL MIN. NOM. MAX. A A1 A D E L L1.1 REF. PACKAGE VARIATIONS PKG. CODE N e b L BSC.3±.5 L822-1 L E A.5 BSC.4 BSC.25±.5.2±.3 b A A2 (N/2-1) x e 1.3 REF. 1.5 REF. 1.6 REF. L L C L e e EVEN TERMINAL A A (N/2-1) x e) b N 1 e C L ODD TERMINAL PACKAGE OUTLINE, 6, 8, 1L udfn, 2x2x.8 mm SOLDER MASK COVERAGE PIN 1.1x45 L1 L A 1 2 6, 8, 1L UDFN.EPS PACKAGE OUTLINE, 6, 8, 1L udfn, 2x2x.8 mm -DRAWING NOT TO SCALE 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, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. Boblet

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