Low-RON, Dual-SPST/Single-SPDT Clickless Switches with Negative Rail Capability

Transcription

1 9-3775; Rev 2; 5/6 Low-RON, Dual-SPST/Single-SPDT Clickless General Description The switches feature negative signal capability that allows signals below ground to pass through without distortion. The MAX49/MAX492 are a dual SPST (single-pole/single-throw) and the MAX493/ MAX494/MAX495 are a single SPDT (singlepole/double-throw) configuration. These analog switches operate from a single +.8V to +5.5V supply and have low.6ω on-resistance, making them ideal for switching audio signals. The MAX495 includes a comparator that can be used for headphone detection or mute/send key function. The MAX492/MAX494/MAX495 have internal shunt resistors to automatically discharge any capacitance at the NO_ and NC connection points. This reduces click-andpop sounds that occur when switching audio signals between pre-charged points. A break-before-make feature and auto-discharge also help to reduce popping. These SPST and SPDT switches are available in space-saving 8-pin TDFN and 9-bump UCSP packages and operate over the -4 C to +85 C extended temperature range. Cell Phones PDAs and Handheld Devices Applications Notebook Computers MP3 Players Features Distortion-Free Signal Throughput Down to VCC - 5.5V Comparator for Headphone or Mute Detection (MAX495) Clickless Switches with Internal Shunt Resistors (MAX492/MAX494/MAX495).6Ω (typ) Low On-Resistance (R ON ).25Ω On-Resistance Flatness +.8V to +5.5V Supply Voltage.4% THD A B C TOP VIEW BUMPS ON BOTTOM MAX49/MAX COM NO IN N.C. Pin Configurations A B C MAX493/MAX494/MAX NO IN COM N.C. (CMPO) COM2 NO2 IN2 N.C. NC N.C. (CMP-) UCSP is a trademark of Maxim Integrated Products, Inc. 3 x 3 UCSP 3 x 3 UCSP ( ) MAX495 ONLY Pin Configurations continued at end of data sheet. Ordering Information/Selector Guide PART PIN-PACKAGE TOP MARK CONFIGURATION COMPARATOR SHUNT PKG CODE MAX49EBL-T.5m m x.5m m 9 U C S P - 9 AEU 2 x SPST No No B9- MAX49ETA-T 8 TD FN - 8 AOW 2 x SPST No No T833-2 MAX492EBL-T.5m m x.5m m 9 U C S P - 9 AEV 2 x SPST No Yes B9- MAX492ETA-T 8 TD FN - 8 AOX 2 x SPST No Yes T833-2 MAX493EBL-T.5m m x.5m m 9 U C S P - 9 AEY x SPDT No No B9- MAX493ETA-T 8 TD FN - 8 AOY x SPDT No No T833-2 MAX494EBL-T.5m m x.5m m 9 U C S P - 9 AEW x SPDT No Yes B9- MAX494ETA-T 8 TD FN - 8 AOZ x SPDT No Yes T833-2 MAX495EBL-T.5m m x.5m m 9 U C S P - 9 AEX x SPDT Yes Yes B9- MAX495ETA-T 8 TD FN - 8 APA x SPDT Yes Yes T833-2 Note: All devices operate over the -4 C to +85 C operating temperature range. Maxim Integrated Products 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.), IN_, CMP V to +6.V COM_, NO_, NC...( - 6V) to ( +.3V) CMPO...-.3V to ( +.3V) Open-Switch Continuous Current NO_, NC (MAX492/MAX494/MAX495)...±3mA Closed-Switch Continuous Current COM_, NO_, NC...±mA Peak Current COM_, NO_, NC (Pulsed at ms, 5% duty cycle)...±2ma Peak Current COM_, NO_, NC (Pulsed at ms, % duty cycle)...±3ma Continuous Power Dissipation (T A = +7 C) 8-Pin TDFN (derate 8.2mW/ C above +7 C)...455mW 9-Bump UCSP (derate 5.2mW/ C above +7 C)...42mW ESD Method ±2kV Operating Temperature Range...-4 C to +85 C Junction Temperature...+5 C Storage Temperature Range C to +5 C Lead Temperature (soldering, s)...+3 C Bump Temperature (soldering) Infrared (5s) C Vapor Phase (6s) C 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.V, T A = +25 C, unless otherwise noted.) (Note ) POWER SUPPLY PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Range V Supply Current I+ = 5.5V, V IN_ = V or MAX49 MAX494. MAX495 5 µa ANALOG SWITCH Analog Signal Range V NO _ V NC, V COM_ (Note 2) V On-Resistance R ON(NC), R ON(NO) = 2.7V, V NC or V NO_ = - 5.5V, -V,, V, 2V, ; I COM = ma (Notes 3, 4) T A = +25 C.6. T A = T MIN to T MAX.2 Ω On-Resistance Match Between Channels R ON = 2.7V, I NO_ or I NC = ma or V NO_ (Notes 3, 4, 5) On-Resistance Flatness R FLAT = V C C - 5.5V, -V,, V, 2V, ; I COM = ma V C C = 2.7V, V N C or V NO_ (Notes 4, 6) T A = +25 C..25 T A = T MIN to T MAX.3 T A = +25 C.25.5 T A = T MIN to T MAX.5 Ω Ω 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.V, T A = +25 C, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Shunt Resistance R SH = 2.7V (MAX492/MAX494/ I NO_or I NC = ma, MAX495) NO_, NC Off-Leakage Current COM_ Off-Leakage Current I NO_(), I NC () I COM_() = 2.7V, switch open; V NC or V NO_ = -2.5V, +2.5V; V COM_ = +2.5V, -2.5V (MAX49/ MAX493) (Notes 3, 7) = 2.7V, switch open; V NC or V NO_ = -2.5V, +2.5V; V COM_ = -2.5V, +2.5V (MAX49) (Note 3) COM_ On-Leakage Current I COM_(ON) V NC or V NO_ = -2.5V, +2.5V, or unconnected ; V C OM _ = - 2.5V, = 2.7V, switch closed; +2.5V or unconnected (Note 3) T A = T MIN to T MAX 3 5 Ω T A = +25 C T A = T MIN to T MAX T A = +25 C T A = T MIN to T MAX T A = +25 C T A = T MIN to T MAX na na na DYNAMIC CHARACTERISTICS Turn-On Time = 2.7V, V NO =.5V, V IN_ = V to ; t ON V NC =.5V, V IN_ = to ; R L = 5Ω, C L = 5pF (Figure ) 25 ns Turn-Off Time t V NC =.5V, V IN_ = to ; R L = 5Ω, = 2.7V, V NO _ =.5V, V IN_ = to ; C L = 5pF (Figure ) 5 ns Break-Before-Make Time Delay (MAX493/MAX494/MAX495) t BBM = 2.7V, V NO_ =.5V, V IN_ = to ; V NC =.5V, V IN_ = to ; R L = 5Ω, C L = 5pF (Figure 2) T A = +25 C 2 T A = T MIN to T MAX ns Charge Injection Q V COM_ = V, R S = Ω, C L =.nf (Figure 3) 25 pc Off-Isolation (Note 8) V ISO f = khz, V COM_ = V RMS, R L = 5Ω, C L = 5pF (Figure 4) Crosstalk V CT f = khz, V COM_ = V RMS, R L = 5Ω, C L = 5pF (Figure 4) -7 db -75 db Power-Supply Rejection Ratio PSRR f = khz, V COM_ = V RMS, R L = 5Ω, C L = 5pF 6 db On-Channel -3dB Bandwidth BW Signal = dbm, R L = 5Ω, C L = 5pF (Figure 4) 27 MHz Total Harmonic Distortion THD f = 2Hz to 2kHz, V COM =.5V P-P, DC bias =, R L = 32Ω.4 % 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.V, T A = +25 C, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS NO_, NC Off-Capacitance C NO_() C NC() f = MHz, V COM =.5V P-P, DC bias = (Figure 5) COM On-Capacitance C COM_(ON) f = MHz, V COM =.5V P-P, DC bias = (Figure 5) DIGITAL I/O (IN_) = 2.7V to 3.6V.4 Input Logic-High Voltage V IH = 4.2V to 5.5V 2. 4 pf 2 pf = 2.7V to 3.6V.5 Input Logic-Low Voltage V IL = 4.2V to 5.5V.8 Input Leakage Current I IN V IN_ = V or - + µa COMPARATOR (MAX495) Comparator Threshold / 3 V Comparator Output-High Voltage I SOURCE = ma Comparator Output-Low Voltage I SINK = ma.4 V Comparator Input Leakage V CMP - = to 2.7V - + na -.4V V V V Comparator Switching Time = 2.7V, V CMP- = V to, from 5% of V CMP - to 5% of V CMPO 2 µs Note : UCSP and TDFN parts are % tested at TA = +25 C only, and guaranteed by design over the specified temperature range. Note 2: Signals on COM_, NO_, or NC exceeding are clamped by internal diodes. Limit forward-diode current to maximum current rating. Note 3: Guaranteed by design. Note 4: I COM for UCSP is ma. Note 5: RON = 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: The MAX492/MAX494/MAX495 have an internal shunt resistor when, in off-state, will determine off-current. Note 8: Off-Isolation = 2log (VCOM / VNO), VCOM = output, VNO = input to off switch. 4

5 (T A = +25 C, = 3.V, unless otherwise noted.) ON-RESISTANCE (Ω) ON-RESISTANCE vs. COM VOLTAGE =.8V = 2.V = 2.3V V+ = 2.5V V+ = 3.V V+ = 5.V COM VOLTAGE (V) SUPPLY CURRENT vs. SUPPLY VOLTAGE (MAX49 MAX494) MAX49 toc MAX49 toc4 ON-RESISTANCE (Ω) ON-RESISTANCE vs. COM VOLTAGE = 5.V T A = +25 C T A = -4 C T A = +85 C COM VOLTAGE (V) SUPPLY CURRENT vs. SUPPLY VOLTAGE (MAX495) Typical Operating Characteristics MAX49 toc2 MAX49 toc5 ON-RESISTANCE (Ω) ON-RESISTANCE vs. COM VOLTAGE = 3.V T A = +85 C T A = +25 C T A = -4 C COM VOLTAGE (V) TURN-ON/TURN- TIME vs. SUPPLY VOLTAGE MAX49 toc3 MAX49 toc6 SUPPLY CURRENT (na) SUPPLY CURRENT (µa) ton/t (ns) t ON t SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) ton/t (ns) = 3.V TURN-ON/TURN- TIME vs. TEMPERATURE t ON t MAX49 toc7 LOGIC THRESHOLD (V) LOGIC THRESHOLD vs. SUPPLY VOLTAGE 2. V IN RISING V IN FALLING.4 MAX49 toc TEMPERATURE ( C) SUPPLY VOLTAGE (V)

6 Typical Operating Characteristics (continued) (T A = +25 C, = 3.V, unless otherwise noted.) CHARGE INJECTION (pc) C L = nf = 2.V CHARGE INJECTION vs. V COM = 5.V V COM (V) MAX49 toc9 LEAKAGE CURRENT (pa) ON-/-LEAKAGE CURRENT vs. TEMPERATURE = 3.V I COM(ON) I COM() TEMPERATURE ( C) MAX49 toc LOSS (db) = 3.V FREQUENCY RESPONSE FREQUENCY (MHz) MAX495 toc -ISOLATION AND CROSSTALK (db) ISOLATION AND CROSSTALK vs. FREQUENCY = 3.V -ISOLATION CROSSTALK MAX49 toc2 THD (%). TOTAL HARMONIC DISTORTION vs. FREQUENCY = 3.V R L = 32Ω MAX49 toc3 PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY = V RMS DC BIAS = 3V C L = 5pF R L = 5Ω MAX49 toc FREQUENCY (MHz). k k k FREQUENCY (Hz) k k k M FREQUENCY (Hz) COMPARATOR THRESHOLD (V) = 5.V COMPARATOR THRESHOLD vs. TEMPERATURE V CMP- RISING V CMP- FALLING MAX49 toc5 COMPARATOR THRESHOLD (V) = 3.V COMPARATOR THRESHOLD vs. TEMPERATURE V CMP- RISING V CMP- FALLING MAX49 toc TEMPERATURE ( C) TEMPERATURE ( C) 6

7 TDFN PIN UCSP Pin Description (MAX49/MAX492 Dual-SPST Switches) NAME FUNCTION Positive Supply-Voltage Input. Bypass V B to with a.µf capacitor as close CC to as possible. 2 A COM Analog Switch, Common Terminal B2 N.C. No Connection. Leave N.C. unconnected. 3 A2 NO Analog Switch, Normally Open Terminal. NO (MAX492) has a shunt resistor to when the switch is in open position. 4 A3 IN Digital Control Input for Analog Switch. A logic high on IN connects COM to NO and a logic low opens the switch. 5 B3 Ground 6 C3 IN2 Digital Control Input for Analog Switch 2. A logic high on IN2 connects COM2 to NO2 and a logic low opens the switch. 7 C2 NO2 Analog Switch 2, Normally Open Terminal. NO2 has a shunt resistor to when the switch is in open position (MAX492). 8 C COM2 Analog Switch 2, Common Terminal EP EP Exposed Pad. Connect exposed pad to. TDFN PIN Pin Description (MAX493/MAX494/MAX495 SPDT Switches) UCSP NAME FUNCTION A Positive Supply-Voltage Input. Bypass to with a.µf capacitor as close to as possible. 2 A2 NO 3 A3 IN 4 B2 N.C. CMPO 5 B3 Ground 6 C3 N.C. CMP- Analog Switch, Normally Open Terminal. NO has a shunt resistor to when the switch is in open position (MAX494/MAX495). Digital Control Input. Logic low on IN connects COM to NC and logic high connects COM to NO. No Connection. Leave N.C. unconnected (MAX493/MAX494). Comparator Output (MAX495) No Connection. Leave N.C. unconnected (MAX493/MAX494). Comparator Input (MAX495) 7 C2 NC Analog Switch, Normally Closed Terminal. NC has a shunt resistor to when the switch is in open position (MAX494/MAX495). 8 B COM Analog Switch, Common Terminal C N.C. No Connection. Leave N.C. unconnected (MAX493/MAX494/MAX495) EP EP Exposed Pad. Connect exposed pad to. 7

8 DirectDrive SOURCE AUDIO SOURCE AUDIO SOURCE 2 NC NO CMPO MAX495 3 COM IN CMP- Typical Operating Circuit SPEAKER MUTE BUTTON Detailed Description The are low on-resistance, low-voltage, dual-spst and single-spdt analog switches that operate from a +.8V to +5.5V supply and are fully specified for nominal 3.V applications. The devices feature a negative signal capability that allows signals below ground to pass through without distortion and have break-before-make switching (MAX493/ MAX494/MAX495). The MAX495 features a comparator that can be used for headphone or mute detection. The comparator threshold is internally generated to be approximately /3 of. The MAX492/MAX494/MAX495 feature an internal shunt resistor to discharge any capacitance at NO_ and NC connection points. This reduces the click-and-pop sounds that occur when switching audio signals. Applications Information Digital Control Inputs The logic inputs accept up to +5.5V, regardless of supply voltage. For example, with a +3.3V supply, IN_ can be driven low to and high to +5.5V, allowing for mixing of logic levels in a system. Driving IN_ rail-to-rail minimizes power consumption. For a +.8V supply voltage, the logic thresholds are.5v (low) and.4v (high). For a +5V supply voltage, the logic thresholds are.8v (low) and 2.V (high). Analog Signal Levels The on-resistance of the changes very little for analog input signals across the entire supply-voltage range (see the Typical Operating Characteristics). The switches are bidirectional. The pass signals as low as VCC - 5.5V, including signals below ground with minimal distortion. Note that there are shunt resistors on NO_ and NC when they are unconnected to COM_ for the MAX492/MAX494/MAX495. Comparator (MAX495) The MAX495 includes a comparator that can be used for mute and headphone detection functions. The positive terminal of the comparator is internally set to VCC / 3. When the negative terminal (CMP-) is below the threshold, the comparator output (CMPO) is a logic high. The comparator threshold of VCC / 3 allows for detection of headphones because headphone audio signals are typically biased to VCC / 2. Shunt Resistor (MAX492/MAX494/MAX495) The 5Ω shunt resistors on the MAX492/MAX494/ MAX495 automatically discharge any capacitance at the NC or NO_ terminals when they are unconnected to COM_. This reduces audio click-and-pop sounds that occur when switching between audio sources. 8

9 Audible clicks and pops are caused when a step DC voltage is switched into the speaker. By automatically discharging the side that is not connected, any residual DC voltage is removed, thereby reducing the clicks and pops. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply before applying analog signals, especially if the analog signal is not current-limited. UCSP Applications Information For the latest application details on UCSP construction, dimensions, tape carrier information, PC board techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to the Application Note: UCSP A Water-Level Chip-Scale Package on Maxim s web site at Pin Configurations/Functional Diagrams/Truth Tables TOP VIEW NOTE: N.C. IS NO CONNECTION (SEE PIN DESCRIPTION TABLE) MAX49/MAX492 8 COM2 MAX493/MAX494 8 COM MAX495 8 COM COM 2 7 NO2 NO 2 7 NC NO 2 7 NC NO 3 6 IN2 IN 3 6 N.C. IN 3 6 CMP- IN 4 5 *EP N.C. 4 5 *EP CMPO /3 *EP TDFN *EXPOSED PAD CONNECTED TO TDFN *EXPOSED PAD CONNECTED TO *EXPOSED PAD CONNECTED TO MAX494/ MAX495 IN NC NO NCS* NOS* ON ON ON ON *NCS AND NOS REFER TO NORMALLY CLOSED SHUNT REGISTER 9

10 LOGIC INPUT NC OR NO_ Figure. Switching Time IN_ COM_ C L INCLUDES FIXTURE AND STRAY CAPACITANCE. R V L OUT = V NC OR V NO_ ( R L + R ON ) R L C L V OUT LOGIC INPUT SWITCH OUTPUT Test Circuits/Timing Diagrams V V 5% V OUT t ON t tr < 5ns tf < 5ns.9 x V UT.9 x V OUT IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. NO_ OR NC COM_ V OUT LOGIC INPUT V 5% IN_ R L C L LOGIC INPUT V OUT.9 x V OUT t BBM C L INCLUDES FIXTURE AND STRAY CAPACITANCE. Figure 2. Break-Before-Make Interval V OUT VOUT V GEN R GEN NC OR NO_ IN_ COM_ C L V OUT IN ON V IL TO V IH IN ON Q = ( V OUT )(C L ) LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. Figure 3. Charge Injection

11 V OR 5Ω IN_ NC +5V COM nf NO* MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. -ISOLATION IS MEASURED BETWEEN COM_ AND "" NO_ OR NC TERMINAL ON EACH SWITCH. -3dB BANDWIDTH 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. V IN V OUT Test Circuits/Timing Diagrams (continued) MEAS 5Ω NETWORK ANALYZER 5Ω 5Ω 5Ω REF -ISOLATION = 2log V OUT V IN LOSS = 2log V OUT V IN CROSSTALK = 2log V OUT V IN *FOR CROSSTALK THIS PIN IS NO2. NC2 AND COM2 ARE OPEN. Figure 4. -3dB Bandwidth, Off-Isolation, and Crosstalk nf PROCESS: BiCMOS Chip Information COM_ MAX49 MAX495 CAPACITANCE METER f = MHz NC_ or NO_ IN V IL OR V IH Figure 5. Channel Off-/On-Capacitance

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 9LUCSP, 3x3.EPS PACKAGE OUTLINE, 3x3 UCSP 2-93 K 2

13 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to 6, 8, &L, DFN THIN.EPS PACKAGE OUTLINE, 6,8, & 4L, TDFN, EXPOSED PAD, 3x3x.8 mm 2-37 H 2 COMMON DIMENSIONS SYMBOL MIN. MAX. A.7.8 D E A..5 L.2.4 k.25 MIN. A2.2 REF. PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-] x e T ±. 2.3±..95 BSC MO229 / WEEA.4±.5.9 REF T ±. 2.3±..95 BSC MO229 / WEEA.4±.5.9 REF T833- T33- T ±. 2.3±..7±. 2.3±..65 BSC.4 BSC MO229 / WEEC ±.5.2±.5.95 REF T ±. 2.3±..65 BSC MO229 / WEEC.3±.5.95 REF T ±. 2.3±..65 BSC MO229 / WEEC.3±.5.95 REF T33-2.5±. 2.3±..5 BSC MO229 / WEED-3.25±.5 2. REF.5±. 2.3±..5 BSC MO229 / WEED-3.25±.5 2. REF T ±. 2.3±. 2.4 REF.4 BSC ± REF PACKAGE OUTLINE, 6,8, & 4L, TDFN, EXPOSED PAD, 3x3x.8 mm -DRAWING NOT TO SCALE H 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. Maxim Integrated Products, 2 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.