MAX9877 19-4076 Rev 0 7/08 Low RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier General Description Features Low Emissions, Filterless Class D Amplifier The MAX9877 combines a high-efficiency Class D Achieves Better than 10dB Margin Under EN55022 audio power amplifier with a stereo Class AB capacitor- Class B Limits less DirectDrive headphone amplifier. Maxims 3rd Low RF Susceptibility Design Rejects TDMA generation, filterless Class D amplifier with active emis- Noise from GSM Radios sions limiting technology provides Class AB perfor- Input Mixer with User-Defined Input Mode mance with Class D efficiency. 725mW Speaker Output (R = 8, PV = 3.7V) SPK DD The MAX9877 delivers up to 725mW from a 3.7V supply 53mW Headphone Output (R = 16, V = 3.7V) HP DD into an 8 load with 87% efficiency to extend battery life. Low 0.05% THD+N at 1kHz (Class D Power The filterless modulation scheme combined with active Amplifier) emissions limiting circuitry and spread-spectrum modu- Low 0.016% THD+N at 1kHz (Headphone lation greatly reduces EMI while eliminating the need for Amplifier) output filtering used in traditional Class D devices. 87% Efficiency (R = 8, P = 750mW) SPK OUT The stereo Class AB headphone amplifier in the 1.6 Analog Switch for Speaker Amplifier Bypass MAX9877 uses Maxims DirectDrive architecture, that High Speaker Amplifier PSRR (72dB at 217Hz) produces a ground-referenced output from a single High Headphone Amplifier PSRR (84dB at 217Hz) supply, eliminating the need for large DC-blocking 2 I C Control capacitors, saving cost, space, and component height. Hardware and Software Shutdown Mode The device utilizes a user-defined input architecture, Click-and-Pop Suppression three preamplifier gain settings, an input mixer, volume Current-Limit and Thermal Protection control, comprehensive click-and-pop suppression, and Available in a Space-Saving, 2.5mm x 2.0mm WLP 2 I C control. A bypass mode feature disables the integrat- Package ed Class D amplifier and utilizes an internal DPST switch to allow an external amplifier to drive the speaker that is Ordering Information connected at the outputs of the MAX9877. The MAX9877 is available in a thermally efficient, PART TEMP RANGE PIN - PAC K A G E space-saving 20-bump WLP package. MAX9877EWP+TG45 -40C to +85C 20 WLP (5x4) Applications +Denotes a lead-free package. T = Tape and reel. Cell Phones G45 indicates protective die coating. Portable Multimedia Players Simplified Block Diagram Pin Configuration SINGLE SUPPLY TOP VIEW 2.7V TO 5.25V (BUMP SIDE DOWN) 1 2 3 4 5 VOLUME PREAMPLIFIER A CONTROL HPR HPL V SS C1N C1P MIXER/MUX B VDD BIAS SDA RXIN+ OUT+ VOLUME 2 I C CONTROL C INTERFACE INB2 INB1 SCL PGND PV DD BYPASS D INA2 INA1 GND RXIN- OUT- MAX9877 WLP Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLELow RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier ABSOLUTE MAXIMUM RATINGS V , PV to PGND..............................................-0.3V to +5.5V Continuous Current In/Out of HPR and HPL.....................140mA DD DD V to PV ..........................................................-0.3V to +0.3V Continuous Current In/Out of RXIN+ and RXIN-...............150mA DD DD V to PGND .........................................................-5.5V to +0.3V Continuous Input Current V ...........................................100mA SS SS C1N to PGND..............................................(V - 0.3V) to +0.3V Continuous Input Current (all other pins) .........................20mA SS C1P to PGND ...........................................-0.3V to (PV + 0.3V) Duration of OUT Short Circuit to GND or PV ........Continuous DD DD HPL, HPR to V Duration of Short Circuit Between OUT+ and OUT- ..Continuous SS (Note 1) ......-0.3V to the lower of (PV - (V + 0.3V)) or +9V Duration of HP Short Circuit to GND or PV ..........Continuous DD SS DD HPL, HPR to PV Continuous Power Dissipation (T = +70C) DD A (Note 2)......+0.3V to the higher of (V - (PV - 0.3V)) or -9V 20-Bump WLP, 5 x 4, Multilayer Board SS DD GND to PGND.....................................................................0.3V (derate 13.0mW/C above +70C)..................................1.04W INA1, INA2, INB1, INB2, BIAS..................................-0.3V to +4V Junction Temperature......................................................+150C SDA, SCL...............................................................-0.3V to +5.5V Operating Temperature Range ...........................-40C to +85C All Other Pins to GND...............................-0.3V to (PV + 0.3V) Storage Temperature Range .............................-65C to +150C DD Continuous Current In/Out of PV , PGND, OUT .........800mA Lead Temperature (soldering, 10s) .................................+300C DD Note 1: HPR and HPL should be limited to no more than 9V above V , or above PV + 0.3V, whichever limits first. SS DD Note 2: HPR and HPL should be limited to no more than 9V below PV , or below V - 0.3V, whichever limits first. DD SS 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 (V = PV = 3.7V, V = V = 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0, DD DD GND PGND SHDN = 1. Speaker loads (Z ) connected between OUT+ and OUT-. Headphone loads (R ) connected from HPL or HPR to GND. SPK HP SDA and SCL pullup voltage = 3.3V. Z = , R = . C1 = C2 = C = 1F. T = T to T , unless otherwise noted. Typical SPK HP BIAS A MIN MAX values are at T = +25C.) (Note 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V , PV Guaranteed by PSRR test 2.7 5.25 V DD DD OSC = 00 5.6 9.0 HP mode, OUTMODE = 2 OSC = 10 5.5 OSC = 00 6.6 11.0 SPK mode, Quiescent Current I mA DD OUTMODE = 7 OSC = 10 5.7 OSC = 00 10.4 16.0 SPK + HP mode, OUTMODE = 9 OSC = 10 9.3 I = I + I SHDN = 0 V = SHDN VDD PVDD SDA Shutdown Current I 10 22 A SHDN V = logic-high T = +25C SCL A OSC = 00 10 Time from shutdown to Turn-On Time t OSC = 01 10 ms ON full operation OSC = 10 17.5 After forcing BIAS low, time from BIAS BIAS Release Time t 25 80 ms BR 2 released to I C reset T = +25C, preamp gain = 0dB or +9dB 11 21 31 A Input Resistance R k IN T = +25C, preamp gain = +20dB 3 5.5 8 A Preamp = 0dB 2.30 Maximum Input Signal Swing Preamp = +9dB 0.820 V P-P Preamp = +20dB 0.230 2 MAX9877