Dual SPDT Negative Rail Analog Switches with ±VCC Capability

Transcription

1 ; Rev 1; 12/8 EVALUATION KIT AVAILABLE Dual SPDT Negative Rail Analog Switches General Description The MAX1454/MAX1455/MAX1455A/MAX1456 dual single-pole/double-throw (SPDT) audio switches feature negative signal capability that allows signals from - to + to pass without distortion. They feature high continuous current ratings of 55mA (continuous) and 85mA (pulsed). These analog switches have low on-resistance, low supply current, and operate from a single +2.3V to +5.5V supply. The MAX1455/MAX1455A have internal shunt switches that discharge the audio amplifier AC-coupling capacitance at the normally open (NO) terminals. This reduces click-and-pop sounds that occur when switching audio signals between precharged points. The MAX1454/ MAX1455/MAX1455A/MAX1456 control the switches with control bit,, and feature an enable input,, that place COM in a high-impedance mode. The MAX1454/MAX1455/MAX1455A/MAX1456 are fully specified to operate from a single +2.3V to +5.5V power supply. These devices are available in a 1.56mm x 2.14mm, 12-bump WLP package, and operate over the -4 C to +85 C extended temperature range. Cell Phones MP3 Players Portable Audio Equipment Speaker Switching Applications Typical Operating Circuit appears at end of data sheet. PART PIN-PACKAGE TOP MARK Features Distortion-Free Negative Signal Throughput from - to + Internal Shunt Switches Reduce Click/Pop (MAX1455/MAX1455A) Low On-Resistance.36Ω (typ) 1mΩ (typ) On-Resistance Flatness COM High Impedance for = High Low.2µA (max) Shutdown Current (MAX1455A/MAX1456) +2.3V to +5.5V Single-Supply Voltage Small, 1.56mm x 2.14mm, 12-Bump WLP Package TOP VIEW (BUMPS ON BOTTOM) A B C + 1 NO2 NC2 Pin Configuration MAX1454/ MAX1455/ MAX1455A/ MAX WLP (1.56mm x 2.14mm) NO1 COM2 COM1 Ordering Information/Selector Guide COM SIGNAL RANGE FOR = NC1 CLICKLESS MAX1454EWC+ 12 WLP AAH ± NO MAX1455EWC+* 12 WLP AAI ± YES MAX1455AEWC+ 12 WLP AAK to + YES MAX1456EWC+* 12 WLP AAJ to + NO Note: All devices are specified over the -4 C to +85 C temperature range. +Denotes a lead(pb)-free/rohs-compliant package. *Future product contact factory for availability. MAX1454/MAX1455/MAX1455A/MAX1456 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 MAX1454/MAX1455/MAX1455A/MAX1456 ABSOLUTE MAXIMUM RATINGS (All voltages referenced to, unless otherwise noted.)...-.3v to +6.V NC_, NO_, COM_ (Note 1) V to +.3V NC_, NO_, COM_ (MAX1455A/MAX1456, = ) (Note 1)...-.3V to +.3V,...-.3V to +6V Continuous Current (NC_, NO_, COM_)...±55mA Continuous Current on Shunt Switches...±5mA Peak Current (NC_, NO_, COM_) (pulsed at 1ms, 1% duty cycle)...±85ma Note 1: Signals on NC_, NO_, and COM_ exceeding - or + are clamped by internal diodes. For V IH signals on NC_, NO_, and COM_ exceeding or + are clamped by internal diodes (MAX1455A/MAX1456). Limit forward-diode current to maximum current rating. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations, refer to 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 Continuous Power Dissipation (T A = +7 C) for multilayer board: 12-Pin WLP (derate 8.5mW/ C above +7 C)...678mW Operating Temperature Range...-4 C to +85 C Junction Temperature C Storage Temperature Range C to +15 C Package Junction-to-Ambient Thermal Resistance (θ JA ) (Note 2) C/W Lead Temperature (soldering)...+3 C ( = +2.3 to +5.5V, T A = T MIN to T MAX, C = 3.3nF, unless otherwise noted. Typical values are at = +3.V, T A = +25 C, unless otherwise noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ANALOG SWITCH Analog Signal Range V = - + NC_, NO_, COM_ V = (MAX1454/ MAX1455) (MAX1455A/ MAX1456) = +3.V, T A = +25 C.36.5 I COM_ = 5mA, On-Resistance R ON V NC_, V NO_ = T A = T MIN to - to.65 T MAX On-Resistance Match Between Channels R ON = +3.V, I NC_ = I NO_ = 5mA; between NC_ and NO_ only On-Resistance Flatness R FLAT (ON) = +3.V, I NC_ = I NO_ = 5mA, V NC_, V NO_ = - to (Note 4) V Ω 1 mω 1 mω Shunt Switch Resistance R SHUNT V NO_ = +1mV Ω 2

3 ELECTRICAL CHARACTERISTICS (continued) ( = +2.3 to +5.5V, T A = T MIN to T MAX, C = 3.3nF, unless otherwise noted. Typical values are at = +3.V, T A = +25 C, unless otherwise noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS NC_ or NO_ Off-Leakage Current COM_ On-Leakage Current DYNAMIC TIMING (Note 5) I NC _ ( OF F), I NO_ (OFF) = +3.V, switch open; V NO_ = -2.5V, +2.5V; V COM_ = +2.5V, -2.5V, unconnected (MAX1454/MAX1456) = +3.V, switch open; V NC_ = -2.5V, +2.5V; V COM_ = +2.5V, -2.5V, unconnected V C C = + 3.V, sw i tch cl osed ; I COM_ (ON) V C OM _ = + 2.5V, - 2.5V ; V N C _ or V N O_ = + 2.5V, - 2.5V, unconnected na na Turn-On Time t ON V NO_ or V NC_ =, R L = 5Ω, Figure ms Turn-Off Time t OFF V NO_ or V NC_ =, R L = 5Ω, Figure µs AUDIO PERFORMANCE Total Harmonic Distortion Plus Noise THD+N f = 2Hz to 2kHz, V COM_ =.5V P-P, R S = R L = 5Ω; DC bias = Off-Isolation V ISO R S = R L = 5Ω; V COM _ =.5V P-P, f = 2kHz (Note 6), Figure 2 Crosstalk V CT R S = R L = 5Ω; V COM _ =.5V P-P, f = 2kHz (Note 7), Figure 2 NC_ or NO_ Off-Capacitance.1 % -84 db -9 db C N C _ ( OF F), C N O _ ( OF F) V NC_/NO_ =.5V P-P, f = 1MHz; Figure 3 65 pf COM_ On-Capacitance C COM _ (ON) V NC_/NO_ =.5V P-P, f = 1MHz; Figure pf LOGIC INPUT (, ) Input Logic-High V IH 1.4 V Input Logic-Low V IL.5 V Input Leakage Current I IN V = V = or µa MAX1454/MAX1455/MAX1455A/MAX1456 3

4 MAX1454/MAX1455/MAX1455A/MAX1456 ELECTRICAL CHARACTERISTICS (continued) ( = +2.3 to +5.5V, T A = T MIN to T MAX, C = 3.3nF, unless otherwise noted. Typical values are at = +3.V, T A = +25 C, unless otherwise noted.) (Note 3) POWER SUPPLY PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Range V Power-Supply Rejection Ratio (PSRR) R COM_ = 5Ω, f = 1kHz 78 db = +3.V, V =, V = or Supply Current I CC = +5.5V, V =, V = or Shutdown Supply Current Supply Current Increase with Supply Voltage I CC_SHDN = +3.V, V = (MAX1454/MAX1455) = +5.5V, V = (MAX1454/MAX1455) = +3.V, V = (MAX1455A/MAX1456) = +5.5V, V = (MAX1455A/MAX1456) I CC_CTRL = 5.5V, V = V =.5V or 1.4V 2 5 µa Negative Charge-Pump Output V C = 3.3nF - 1.1V C C V C C V Note 3: All parameters are production tested at T A = +85 C, and guaranteed by design over the specified temperature range. Note 4: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 5: All timing is measured using 2% and 8% levels. Note 6: Off-Isolation = 2log 1 [V COM_ /(V NO_ or V NC_ )], V COM_ = output, V NO_ or V NC_ = input to off switch. Note 7: Between any two switches. ( = 3.V, T A = +25 C, unless otherwise noted.) RON (Ω) = 2.3V ON-RESISTANCE vs. V COM T A = +85 C T A = +25 C T A = -4 C V COM (V) MAX1454 toc1 RON (Ω) = 3.V ON-RESISTANCE vs. V COM T A = +85 C T A = +25 C T A = -4 C V COM (V) MAX1454 toc Typical Operating Characteristics RON (Ω) = 5.5V.2 ON-RESISTANCE vs. V COM T A = +85 C T A = +25 C T A = -4 C µa µa V COM (V) MAX1454 toc3 4

5 Typical Operating Characteristics (continued) ( = 3.V, T A = +25 C, unless otherwise noted.) SUPPLY CURRT (µa) RON (Ω) R ON FLATNESS vs. V COM ton (ms) SUPPLY CURRT vs. TEMPERATURE = 5.5V = 3.V = = TEMPERATURE ( C) 5 V COM (V) NC_/NO_ TURN-ON/TURN-OFF TIME vs. TEMPERATURE t ON t OFF MAX1454 toc TEMPERATURE ( C) MAX1454 toc8 LOGIC-INPUT LOW THRESHOLD (V) MAX1454 toc toff (µs) ton (ms) SUPPLY CURRT (µa) NC_/NO_ TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE t ON t OFF MAX1454 toc SUPPLY VOLTAGE (V) LOGIC-INPUT LOW THRESHOLD vs. SUPPLY VOLTAGE V IH V IL 5 = = SUPPLY VOLTAGE (V) SUPPLY CURRT vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) MAX1454 toc9 SUPPLY CURRT (µa) = 5.5V = MAX1454 toc toff (µs) SUPPLY CURRT vs. LOGIC LEVEL LOGIC LEVEL (V) MAX1454 toc1 MAX1454/MAX1455/MAX1455A/MAX1456 5

6 MAX1454/MAX1455/MAX1455A/MAX1456 Typical Operating Characteristics (continued) ( = 3.V, T A = +25 C, unless otherwise noted.) COM_ ON-LEAKAGE CURRT (na) OFF-ISOLATION (db) COM_ ON-LEAKAGE CURRT vs. TEMPERATURE V COM_ = 2.5V V NC_ /V NO_ = UNCONNECTED TEMPERATURE ( C) OFF-ISOLATION vs. FREQUCY FREQUCY (MHz) MAX1454 toc11 MAX1454 toc14 NC_/NO_ OFF-LEAKAGE CURRT (pa) CROSSTALK (db) PSRR (db) TEMPERATURE ( C) NC_/NO_ OFF-LEAKAGE CURRT vs. TEMPERATURE V NC_ /V NO_ = 2.5V V COM_ = UNCONNECTED CROSSTALK vs. FREQUCY FREQUCY (MHz) POWER-SUPPLY REJECTION RATIO vs. FREQUCY MAX1454 toc12 MAX1454 toc15 MAX1454 toc17 THD+N (%) ON-LOSS (db) ON-LOSS vs. FREQUCY FREQUCY (MHz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUCY FREQUCY (khz) MAX1454 toc13 MAX1454 toc FREQUCY (khz) 6

7 MAX1454/ MAX1455/ MAX1455A/ MAX1456 LOGIC INPUT V N_ = V R V OUT = V IN_ ( ON R ON + R L V N_ = V NO_ OR V NC_ Figure 1. Switching Time V OR 5Ω NC1 NO_ OR NC_ OR ) MAX1454/ MAX1455/ MAX1455A/ MAX1456.1µF COM1 NO1* C V REF = 1.5V R L C V IN V OUT V OUT MEAS LOGIC INPUT SWITCH OUTPUT Test Circuits/Timing Diagrams V IH V IL V NETWORK ANALYZER 5Ω 5Ω 5Ω REF 5Ω 5% V OUT t ON t OFF t R < 5ns t F < 5ns.8 x V UT.2 x V OUT OFF-ISOLATION = 2log CROSSTALK = 2log V OUT ( ) V OUT V IN ( ) V IN MAX1454/MAX1455/MAX1455A/MAX1456 MEASUREMTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWE COM_ AND OFF. NO_ OR NC_ TERMINAL ON EACH CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. *FOR CROSSTALK, THIS PIN IS NO2. NC2 AND COM2 ARE OP. Figure 2. Off-Isolation and Crosstalk 7

8 MAX1454/MAX1455/MAX1455A/MAX1456 PIN NAME FUNCTION A1 NO2 Analog Switch 2, Normally Open Terminal A2 Test Circuits/Timing Diagrams (continued) Pin Description Negative Supply Voltage Output. Connect to with a 3.3nF capacitor. Do not use to power any external circuitry. Positive Supply Voltage Input. Connect to a +2.3V to +5.5V supply voltage. Bypass to A3 with a.1µf ceramic capacitor placed as close as possible to the device. A4 NO1 Analog Switch 1, Normally Open Terminal B1 COM2 Analog Switch 2, Common Terminal B2 CAPACITANCE METER f = 1MHz Figure 3. Channel Off-/On-Capacitance B3, C3 Ground Active-Low Enable Input. Drive high to put switches in a high-impedance mode. Shunt click/pop switches are not affected by the state of. The MAX1455A/MAX1456 enter a low current state when is driven high. B4 COM1 Analog Switch 1, Common Terminal C1 NC2 Analog Switch 2, Normally Closed Terminal C2 Control Bit Input. controls switch 1 and switch 2. See the Functional Diagram/Truth Table. COM_ NC_ OR NO_ C4 NC1 Analog Switch 1, Normally Closed Terminal.1µF MAX1454/ MAX1455/ MAX1455A/ MAX1456 V IL OR V IH C 8

9 Detailed Description The MAX1454/MAX1455/MAX1455A/MAX1456 are low on-resistance, low-voltage, dual SPDT analog switches that operate from a +2.3V to +5.5V single supply. These devices feature a negative signal capability that allows signals as low as - to pass through without distortion. NC1 NC2 NO1 NO2 C 1 X = DON'T CARE. X 1 MAX1454/ MAX1456 COM_ TO NC_ HIGH IMPEDANCE ON OFF COM_ TO NO_ HIGH IMPEDANCE OFF ON COM1 COM2 The MAX1454/MAX1455/MAX1455A/MAX1456 have an enable input to put the switches in a highimpedance mode. When =, the MAX1454/ MAX1455 terminals have a signal range of - to +. The MAX1455A/MAX1456 terminals have a signal range of to +. The MAX1455A/MAX1456 feature a low supply current when =. The MAX1455/MAX1455A have internal shunt switches on both NO1 and NO2 terminals to suppress clickand-pop sounds that can occur when switching audio signals between precharged points. NC1 NC2 NO1 NO2 Functional Diagram/Truth Table C X X X = DON'T CARE. 1 MAX1455/ MAX1455A SHUNT SWITCH (MAX1455/MAX1455A) ON OFF COM1 COM2 MAX1454/MAX1455/MAX1455A/MAX1456 9

10 MAX1454/MAX1455/MAX1455A/MAX1456 Digital Control Inputs The MAX1454/MAX1455/MAX1455A/MAX1456 logic inputs accept up to +5.5V, regardless of supply voltage. For example, with a +3.3V supply, and can be driven low to and high to +5.5V, allowing for mixed logic levels in a system. Using logic levels of V IL = to V IH reduces supply current. Analog Signal Levels These devices pass signals from - to + with minimal distortion and very little change in on-resistance (see the Typical Operating Characteristics). The switches are bidirectional; therefore, the NO_, NC_, and COM_ terminals can be used as either inputs or outputs. Click-and-Pop Suppression The MAX1455/MAX1455A have a shunt switch on NO1 and NO2 terminals to automatically discharge any capacitance when they are not connected to COM1 and COM2. The shunt switch reduces audible clickand-pop sounds that occur when switching between capacitively coupled audio sources. Audible clicks and pops are caused when a step DC voltage is switched into the speaker. The DC step transients are reduced by automatically discharging the side that is not connected to the COM terminal, reducing any residual DC voltage and reducing clicks and pops. Applications Information Power-Supply Sequencing 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 remove all signals and power and then reapply properly. Connect all ground pins first, apply power to, and finally apply signals to NO_, NC_, and COM_. Follow the reverse order upon power-down. 1

11 PROCESS: CMOS MAX9788 CLASS G AUDIO AMPLIFIER CLASS D AUDIO AMPLIFIER MAX9722 DirectDrive AMPLIFIER AUDIO AMPLIFIER C C NC1 NC2 NO1 NO2 NC1 NC2 NO1 NO2 Chip Information MAX1454/MAX1456 MAX1455/MAX1455A.1µF.1µF COM1 COM2 COM1 COM2 Typical Operating Circuit Package Information For the latest package outline information and land patterns, go to MAX1454/MAX1455/MAX1455A/MAX1456 PACKAGE TYPE PACKAGE CODE DOCUMT NO. 12 WLP W121A DirectDrive is a registered trademark of Maxim Integrated Products, Inc. 11

12 MAX1454/MAX1455/MAX1455A/MAX1456 REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 8/8 Initial release 1 12/8 Changed Pin Configuration and Pin Description sections 1, 8, 11 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 Maxim is a registered trademark of Maxim Integrated Products, Inc.