19-4295; Rev 0; 10/08 Shunt Mode Audio Click-and-Pop Eliminator The MAX9892 is an audio click-and-pop eliminator for portable multimedia devices. Operating from a 1.7V to 3.6V supply, the MAX9892 connects to the output of the existing system amplifier and provides a low-impedance path to ground during startup and shutdown. The inputs INL and INR accept voltage swings from VDD to 5.5V below VDD. See the Setting the Supply Voltage section for more information. The power-up and powerdown transients are shunted to ground to prevent clicks and pops from becoming audible. The MAX9892 features two low-impedance analog switches controlled by MUTE that opens and closes the switches. The switches are open during normal operation and have no impact on the output signal. During startup and shutdown of the amplifier, the MAX9892 can be activated to short the outputs to ground and prevent clicks and pops from pulling current through the headphones. The MAX9892 is available in 6-bump UCSP (1mm x 1.52mm x 0.6mm) and 6-pin µDFN (2mm x 2mm x 0.75mm) packages. The MAX9892 is specified over the -40°C to +85°C temperature range. Applications Features ♦ Distortion-Free, Click-and-Pop Elimination ♦ Less than 1µA Supply Current ♦ 1.7V to 3.6V Single-Supply Operation ♦ Tiny Packages 6-Bump UCSP (1mm x 1.52mm x 0.6mm) 6-Pin µDFN (2mm x 2mm x 0.75mm) Ordering Information TEMP RANGE PIN-PACKAGE MAX9892ERT+ PART -40°C to +85°C 6 UCSP MAX9892ELT+ -40°C to +85°C 6 µDFN +Denotes a lead-free/RoHS-compliant package. Pin Configurations TOP VIEW (BUMPS ON BOTTOM) Mobile Phones 1 2 3 INL GND INR Smart Phones Mobile Internet Devices A Portable Gaming Consoles Portable Media Players MAX9892 Notebook Computers B VDD MUTE SET Typical Operating Circuit RSERIES HEADPHONE AMPLIFIER UCSP TOP VIEW RSERIES INL MUTE VDD SET 6 5 4 INR MAX9892 1.7V TO 3.6V MAX9892 MUTE VDD 0.1μF + SET GND 1 INL C SET 2 3 GND INR μDFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX9892 General Description MAX9892 Shunt Mode Audio Click-and-Pop Eliminator ABSOLUTE MAXIMUM RATINGS VDD, MUTE, SET to GND..........................................-0.3V to +6V INL, INR to GND .................................(VDD - 6V) to (VDD + 0.3V) Continuous Current In/Out of VDD ......................................30mA Continuous Current In/Out of MUTE ...................................30mA Continuous Current In/Out of SET.......................................30mA Continuous Current In/Out of INL, INR and GND .............390mA Continuous Power Dissipation (TA = +70°C) 6-Bump UCSP (derate 3.9mW/°C above +70°C) .....308.3mW 6-Pin µDFN (derate 4.5mW/°C above +70°C) ..........357.8mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Bump Temperature (soldering) Reflow ..........................................................................+235°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 (VDD = 3.0V, VGND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range VDD Guaranteed by RON test 1.7 5.5 V Recommended Supply Voltage Range VDD (Note 2) 1.7 3.6 V Supply Current IDD VDD = 5.5V, TA = +25°C (Note 3) 1 µA VDD V Input Voltage Range VIN Guaranteed by input leakage current test Turn-On Time (Figure 1) tON Measured from MUTE = GND and input voltage settled to 90% of its final value CSET = 500pF Turn-Off Time (Figure 1) tOFF Turn-On Time Resistor RSET Switch On-Resistance RON 0.6 VDD 5.5V 130 4 10 CSET = 50pF 1 CSET = 50nF 1000 CSET = 500pF 350 VDD = 3.0V 800 IIN MUTE Leakage Current IMUTE MUTE Input-Voltage High VIH MUTE Input-Voltage Low VIL TA = +25°C ms 1300 kΩ 2 Ω 1 RSERIES = 30Ω, RLOAD = 16Ω Input Leakage Current 17 0.3 VDD = 1.7V VDD = 5.5V Click-and-Pop Reduction ns 35 dB VIN = VDD - 5.5V, VDD = 1.7V ±1 VIN = VDD, VDD = 5.5V ±1 VDD = 5.5V, VMUTE = 0 or 5.5V, TA = +25°C ±1 1.5 µA µA V 0.4 V Note 1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design. Note 2: Operating within the recommended supply voltage range ensures that negative audio signals are not limited by the device. Supply voltages above the recommended supply voltage range may limit the headphone amplifier’s maximum output voltage. Note 3: Supply current is measured when switches are off. 2 _______________________________________________________________________________________ Shunt Mode Audio Click-and-Pop Eliminator CLICK AND POP vs. RSERIES 0.7 0.6 -30 -40 -50 -60 RON (Ω) 800 600 200 0.1 INTO SHUTDOWN -90 0 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 SUPPLY CURRENT vs. SUPPLY VOLTAGE 0.6 0.4 4.5 5.5 SWITCH TURN-OFF/ON TIME -20 0.2 3.5 CLICK AND POP vs. VDD TESTED WITH THE MAX4338 CLICK AND POP (dBV) 0.8 2.5 VDD (V) 0 MAX9892 toc04 1.0 1.5 CSET (nF) RSERIES (Ω) MAX9892 toc06 MAX9892 toc05 0 0.4 0.2 OUT OF SHUTDOWN -80 0.5 0.3 400 -70 CSET = 500pF MUTE 2V/div -40 -60 OUT OF SHUTDOWN IN_ 2V/div -80 INTO SHUTDOWN 0 -100 2.5 3.5 4.5 5.5 1.5 2.5 VDD (V) 3.5 4.5 5.5 2ms/div VDD (V) CROSSTALK vs. FREQUENCY 0 MAX9892 toc07 1.5 -20 CROSSTALK (dB) IDD (μA) 0.8 MAX9892 toc03 1000 tOFF (ms) CLICK AND POP (dBV) -20 1200 MAX9892 toc02 MAX9892 toc01 TESTED WITH THE MAX4338 -10 RON vs. SUPPLY VOLTAGE tOFF vs. CSET 0 -40 -60 -80 -100 -120 0.01 0.1 1 10 100 FREQUENCY (kHz) _______________________________________________________________________________________ 3 MAX9892 Typical Operating Characteristics (VDD = 3.0V, VGND = 0, TA = +25°C, unless otherwise noted.) Shunt Mode Audio Click-and-Pop Eliminator MAX9892 Pin Description UCSP µDFN BUMP PIN A1 1 INL A2 2 GND Ground A3 3 INR Right-Channel Input. Connect INR in between the output coupling capacitor and the headphone jack. B1 6 MUTE B2 5 VDD Power Supply B3 4 SET Turn-Off Time Set. Connect an external capacitor in between SET and GND to set the switch open delay; see the Setting the Turn-Off Time section for more information. NAME FUNCTION Left-Channel Input. Connect INL in between the output coupling capacitor and the headphone jack. Active-Low Enable Timing Diagram MUTE GND VDD IN_ GND VDD - 5.5V tOFF RON tON 0.5Ω Figure 1. Turn-On/Off Time 4 _______________________________________________________________________________________ Shunt Mode Audio Click-and-Pop Eliminator The MAX9892 is the second-generation click-and-pop eliminator designed to be used with conventional headphone amplifiers. The MAX9892 works by adding a lowimpedance current path from the headphone side of the DC-blocking capacitor to ground. Drive MUTE low when turning off the amplifier, and high when enabling the amplifier. A short turn-on time allows the switches in the MAX9892 to close before the DC-blocking capacitors have significantly discharged, eliminating clicks and pops at amplifier turn-off. An adjustable turn-off time allows the delay to be set to mask all clicks and pops during amplifier turn-on. Setting the Turn-Off Time The MAX9892 features a SET input that allows the turnoff time to be adjusted from 1ms to 1000ms to match the click-and-pop profile of the amplifier startup. The value of an external capacitor sets the switch open delay, as shown in the following equation: where VAMP is the supply voltage of the amplifier, and I2 is the current through R2. For a signal of ±2V in reference to GND, the MAX9892 supply can be set from 2V to 3.5V. Selecting Series Resistors A series resistor (RSERIES), as shown in the Typical Operating Circuit, is necessary to achieve optimal clickand-pop reduction. See the Click and Pop vs. RSERIES graph in the Typical Operating Characteristics for details on how much click-and-pop reduction to expect for a given series resistor. Layout Considerations Bypass VDD to GND with a 0.1µF capacitor. The 0.1µF bypass capacitor should be positioned as close as possible to VDD. Minimize trace length from GND to solid system ground plane to ensure optimum performance. Refer to the MAX9892 Evaluation Kit for a proven PCB layout. tON (ms) = 0.02 x CSET (pF) When the headphone amplifier is enabled, the MAX9892 automatically waits the set delay time before opening the analog switches. This allows amplifier turnon click and pop to be eliminated. A Applications Information Setting the Supply Voltage The MAX9892 operates from 1.7V to 3.6V supply voltage. The inputs, INL and INR, accept voltage swings from VDD to VDD - 5.5V. The audio signal applied to a headphone is ground biased, meaning that the signal swings just as much negative as positive. Since the MAX9892 input voltage is limited to VDD - 5.5V on the negative side, the voltage on VDD must be set properly to pass the audio signal when the switch is open (Figure 2). A voltage-divider can be used to scale down an available supply voltage as shown in Figure 3. The voltagedivider allows the creation of a supply voltage for the MAX9892 that is low enough to allow the negative portion of the audio signal to pass. When using large resistances for the voltage-divider, the supply current affects what resistors to use. Select R2 between 10kΩ to 1MΩ for a given supply voltage. Use the following equation to calculate the R1: R1 = VDD IN_ GND VDD - 5.5V B VDD IN_ GND VDD - 5.5V Figure 2. Proper Supply Selected for a Given Input Signal. A: Supply Voltage with a Large Signal; B: Supply Voltage with a Small Signal (VAMP − VDD ) I2 + IDD _______________________________________________________________________________________ 5 MAX9892 Detailed Description MAX9892 Shunt Mode Audio Click-and-Pop Eliminator UCSP Applications Information For the latest application details on UCSP construction, dimensions, tape-carrier information, printed circuit board techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to Application Note 1891: Understanding the Basics of the WaferLevel Chip-Scale Package (WL-CSP) at www.maximic.com/ucsp. See Figure 4 for the recommended MAX9892 PCB footprint. HEADPHONE AMP VDD R1 VDD MAX9892 R2 0.1μF GND 45±5μm Figure 3. Scaling Down the Supply Voltage with a Voltage Divider 250μm Figure 4. PCB Footprint Recommendation Diagram Chip Information PROCESS: BiCMOS 6 _______________________________________________________________________________________ Shunt Mode Audio Click-and-Pop Eliminator PACKAGE CODE DOCUMENT NO. 6 UCSP R6-1A1+1 21-0228 6 µDFN L622-1 21-0164 UCSP.EPS PACKAGE TYPE _______________________________________________________________________________________ 7 MAX9892 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. A D b e 6, 8, 10L UDFN.EPS MAX9892 Shunt Mode Audio Click-and-Pop Eliminator N AAA AAA SOLDER MASK COVERAGE E PIN 1 0.10x45∞ L PIN 1 INDEX AREA L1 1 SAMPLE MARKING A A (N/2 -1) x e) 7 C L C L b L A A2 A1 L e e EVEN TERMINAL ODD TERMINAL PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm 21-0164 8 _______________________________________________________________________________________ B 1 2 Shunt Mode Audio Click-and-Pop Eliminator COMMON DIMENSIONS MAX. SYMBOL A MIN. NOM. 0.70 0.75 0.80 A1 0.15 0.20 0.25 A2 D E 0.020 1.95 1.95 0.025 2.00 2.00 0.035 2.05 2.05 L 0.30 0.40 0.10 REF. 0.50 L1 PACKAGE VARIATIONS PKG. CODE N e b (N/2 -1) x e L622-1 6 0.65 BSC 0.30±0.05 1.30 REF. L822-1 8 0.50 BSC 0.25±0.05 1.50 REF. L1022-1 10 0.40 BSC 0.20±0.03 1.60 REF. PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm 21-0164 B 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, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX9892 Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.