MAX9892 Shunt Mode Audio Click-and-Pop Eliminator General Description 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 power-down 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 UCSPTM (1mm x 1.52mm x 0.6mm) and 6-pin DFN (2mm x 2mm x 0.75mm) packages. The MAX9892 is specified over the -40C to +85C temperature range. Features Distortion-Free, Click-and-Pop Elimination Less than 1A Supply Current 1.7V to 3.6V Single-Supply Operation Tiny Packages * 6-Bump UCSP (1mm x 1.52mm x 0.6mm) * 6-Pin DFN (2mm x 2mm x 0.75mm) Ordering Information PART TEMP RANGE PIN-PACKAGE MAX9892ERT+ -40C to +85C 6 UCSP MAX9892ELT+ -40C to +85C 6 DFN +Denotes a lead-free/RoHS-compliant package. Pin Configurations TOP VIEW (BUMPS ON BOTTOM) Applications A Mobile Phones Smart Phones Mobile Internet Devices Portable Gaming Consoles Portable Media Players Notebook Computers 2 3 INL GND INR MAX9892 B Typical Operating Circuit VDD MUTE SET UCSP TOP VIEW RSERIES HEADPHONE AMPLIFIER 1 MUTE VDD SET 6 5 4 RSERIES INL INR 1.7V TO 3.6V MAX9892 MAX9892 MUTE VDD + 0.1F SET GND CSET 1 2 3 INL GND INR DFN UCSP is a trademark of Maxim Integrated Products, Inc. 19-4295; Rev 1; 12/16 MAX9892 Shunt Mode Audio Click-and-Pop Eliminator Absolute Maximum Ratings Operating Temperature Range............................ -40C to +85C Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +150C Lead Temperature (soldering, 10s).................................. +300C Bump Temperature (soldering) Reflow...........................................................................+235C 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 = +70C) 6-Bump UCSP (derate 3.9mW/C above +70C)......308.3mW 6-Pin DFN (derate 4.5mW/C above +70C)..........357.8mW 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. Package Thermal Characteristics (Note 1) DFN Junction-to-Ambient Thermal Resistance (JA)....223.60C/W Junction-to-Case Thermal Resistance (JC)..............122C/W UCSP Junction-to-Ambient Thermal Resistance (JA)....259.50C/W Junction-to-Case Thermal Resistance (JC)...................... N/A Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (VDD = 3.0V, VGND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) 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 3) 1.7 3.6 V Supply Current IDD VDD = 5.5V, TA = +25C (Note 4) 1 A Input Voltage Range VIN Guaranteed by input leakage current test VDD V 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) Turn-On Time Resistor tOFF RSET 0.6 VDD 5.5V 130 4 CSET = 50pF 1 CSET = 50nF 1000 CSET = 500pF 350 RON Input Leakage Current MUTE Leakage Current IIN IMUTE MUTE Input-Voltage High VIH MUTE Input-Voltage Low VIL ms k VDD = 1.7V 2 VDD = 5.5V 1 0.3 RSERIES = 30, RLOAD = 16 Click-and-Pop Reduction TA = +25C 800 17 1300 VDD = 3.0V Switch On-Resistance 10 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 = +25C 1 1.5 A A V 0.4 V Note 2: All devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Note 3: 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 4: Supply current is measured when switches are off. www.maximintegrated.com Maxim Integrated 2 MAX9892 Shunt Mode Audio Click-and-Pop Eliminator Typical Operating Characteristics (VDD = 3.0V, VGND = 0, TA = +25C, unless otherwise noted.) -50 -60 RON () 800 -40 600 200 0 20 30 40 50 60 70 80 90 100 0.1 0 5 10 15 20 25 30 35 40 45 50 RSERIES () SUPPLY CURRENT vs. SUPPLY VOLTAGE 0.6 0.4 0.2 2.5 3.5 4.5 3.5 4.5 5.5 CLICK AND POP vs. VDD SWITCH TURN-OFF/ON TIME MAX9892 toc06 TESTED WITH THE MAX4338 CSET = 500pF MUTE 2V/div -40 -60 -100 5.5 2.5 VDD (V) OUT OF SHUTDOWN -80 1.5 1.5 CSET (nF) -20 CLICK AND POP (dBV) 0.8 IDD (A) 0 MAX9892 toc04 1.0 0 MAX9892 toc05 INTO SHUTDOWN 0 10 0.4 0.2 OUT OF SHUTDOWN -80 0.5 0.3 400 -70 0 0.7 0.6 -30 -90 RON vs. SUPPLY VOLTAGE 0.8 MAX9892 toc03 1000 tOFF (ms) CLICK AND POP (dBV) -20 tOFF vs. CSET 1200 MAX9892 toc02 TESTED WITH THE MAX4338 -10 MAX9892 toc01 CLICK AND POP vs. RSERIES 0 IN_ 2V/div INTO SHUTDOWN 1.5 2.5 VDD (V) 3.5 4.5 5.5 2ms/div VDD (V) CROSSTALK vs. FREQUENCY MAX9892 toc07 0 CROSSTALK (dB) -20 -40 -60 -80 -100 -120 0.01 0.1 1 10 100 FREQUENCY (kHz) www.maximintegrated.com Maxim Integrated 3 MAX9892 Shunt Mode Audio Click-and-Pop Eliminator Pin Description UCSP DFN 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 RON tOFF tON 0.5 Figure 1. Turn-On/Off Time www.maximintegrated.com Maxim Integrated 4 MAX9892 Shunt Mode Audio Click-and-Pop Eliminator Detailed Description The MAX9892 is the second-generation click-and-pop eliminator designed to be used with conventional headphone amplifiers. The MAX9892 works by adding a low-impedance 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 0.1F capacitor. The 0.1F 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 turn-on click and pop to be eliminated. A VDD IN_ Applications Information VDD - 5.5V 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 voltage-divider 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 10k to 1M for a given supply voltage. Use the following equation to calculate the R1: R1 = www.maximintegrated.com GND 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 ( V AMP - VDD ) I 2 + IDD Maxim Integrated 5 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 Wafer-Level ChipScale Package (WL-CSP) at www.maximintegrated. com/ucsp. See Figure 4 for the recommended MAX9892 PCB footprint. HEADPHONE AMP VDD R1 VDD R2 MAX9892 0.1F GND 455m Figure 3. Scaling Down the Supply Voltage with a Voltage Divider 250m Figure 4. PCB Footprint Recommendation Diagram Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 6 UCSP R61A1+1 21-0228 6 DFN L622-1 21-0164 www.maximintegrated.com Maxim Integrated 6 MAX9892 Shunt Mode Audio Click-and-Pop Eliminator Revision History REVISION REVISION NUMBER DATE 0 10/08 1 12/16 PAGES CHANGED DESCRIPTION Initial release Added Package Thermal Characteristics section and updated Electrical Characteristics table -- 1, 2 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2016 Maxim Integrated Products, Inc. 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX9892ELT+T MAX9892ERT+T