MAX9724C/MAX9724D 19-4130 Rev 0 5/08 Low RF Susceptibility DirectDrive Stereo Head- phone Amplifier with 1.8V Compatible Shutdown General Description Features Improved RF Noise Rejection (Up to 67dB Over The MAX9724C/MAX9724D stereo headphone ampli- Typical Amplifiers) fiers are designed for portable equipment where board space is at a premium. These devices use a unique, No Bulky DC-Blocking Capacitors Required DirectDrive architecture to produce a ground-refer- Low-Power Shutdown Mode, < 0.1A enced output from a single supply, eliminating the need Adjustable Gain (MAX9724C) or Fixed -1.5V/V for large DC-blocking capacitors, saving cost, board Gain (MAX9724D) space, and component height. The MAX9724 sup- Low 0.02% THD+N presses RF radiation received by input and supply High PSRR (80dB at 1kHz) Eliminates LDO traces acting as antennas and prevents the amplifier Integrated Click-and-Pop Suppression from demodulating the coupled noise. The MAX9724C offers an externally adjustable gain while the 2.5V to 5.5V Single-Supply Operation MAX9724D has an internally preset gain of -1.5V/V. The Low Quiescent Current (3.5mA) MAX9724C/MAX9724D deliver up to 60mW per channel Available in Space-Saving Packages into a 32 load and have low 0.02% THD+N. An 80dB 12-Bump UCSP (1.5mm x 2mm) at 1kHz power-supply rejection ratio (PSRR) allows 12-Pin Thin QFN (3mm x 3mm x 0.8mm) these devices to operate from noisy digital supplies Ordering Information without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and TOP pops on startup and shutdown. PART GAIN (V/V) PIN-PACKAGE MARK The MAX9724C/MAX9724D operate from a single 2.5V MAX9724CEBC+T Adj. 12 UCSP +AGE to 5.5V supply, consume only 3.5mA of supply current, MAX9724CETC+ Adj. 12 TQFN-EP* +ABJ feature short-circuit and thermal-overload protection, and are specified over the extended -40C to +85C MAX9724DEBC+T -1.5 12 UCSP +AEH temperature range. The devices are available in tiny MAX9724DETC+ -1.5 12 TQFN-EP* +ABK 12-bump UCSP (1.5mm x 2mm) and 12-pin thin QFN Note: All devices specified over the -40C to +85C operating (3mm x 3mm x 0.8mm) packages. range. +Denotes a lead-free package. Applications T = Tape and reel. DVD Players Cellular Phones *EP = Exposed pad. Smart Phones MP3 Players PDAs Notebook PCs DirectDrive is a registered trademark of Handheld Gaming Consoles Maxim Integrated Products, Inc. UCSP is a trademark of Maxim Integrated Products, Inc. Pin Configurations appear at end of data sheet. Block Diagrams MAX9724D MAX9724C DirectDrive OUTPUTS DirectDrive OUTPUTS LEFT ELIMINATE DC-BLOCKING LEFT ELIMINATE DC-BLOCKING AUDIO CAPACITORS AUDIO CAPACITORS INPUT INPUT SHDN SHDN RIGHT RIGHT AUDIO FIXED GAIN ELIMINATES AUDIO INPUT EXTERNAL RESISTOR INPUT NETWORK 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.Low RF Susceptibility DirectDrive Stereo Head- phone Amplifier with 1.8V Compatible Shutdown ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Continuous Input Current into PVSS .................................260mA DD PVSS to SVSS........................................................-0.3V to +0.3V Continuous Input Current (any other pin).........................20mA PGND to SGND .....................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C, multilayer board) A C1P to PGND..............................................-0.3V to (V + 0.3V) 12-Bump UCSP (derate 6.5mW/C above +70C) ........519mW DD C1N to PGND...........................................(PVSS - 0.3V) to +0.3V ................................................................................154 C/W JA PVSS and SVSS to PGND.........................................-6V to +0.3V 12-Pin TQFN (derate 16.7mW/C above +70C) .........1333mW IN to SGND (MAX9724C) .........................-0.3V to (V + 0.3V) ..................................................................................60C/W DD JA IN to SGND (MAX9724D) ............(SVSS - 0.3V) to (V + 0.3V) ..................................................................................11C/W DD JC OUT to SVSS (Note 1) ...-0.3V to Min (V - SVSS + 0.3V, +9V) Operating Temperature Range ...........................-40C to +85C DD OUT to V (Note 2) .....+0.3V to Max (SVSS - V - 0.3V, -9V) Storage Temperature Range .............................-65C to +150C DD DD SHDN to GND.........................................................-0.3V to +6V Junction Temperature......................................................+150C OUT Short Circuit to GND ........................................Continuous Lead Temperature (soldering, 10s) .................................+300C Short Circuit between OUTL and OUTR ....................Continuous Bump Temperature (soldering) Reflow............................+235C Note 1: OUTR and OUTL should be limited to no more than 9V above SVSS, or above V + 0.3V, whichever limits first. DD Note 2: OUTR and OUTL should be limited to no more than 9V below V , or below SVSS - 0.3V, whichever limits first. DD 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 = 5V, PGND = SGND, SHDN = 5V, C1 = C2 = 1F, R = , resistive load reference to ground for MAX9724C gain = -1.5V/V DD L (R = 20k, R = 30k) for MAX9724D gain = -1.5V/V (internally set), T = -40C to +85C, unless otherwise noted. Typical values IN F A are at T = +25C, unless otherwise noted.) (Note 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL Supply Voltage Range V 2.5 5.5 V DD Quiescent Current I 3.5 5.5 mA CC Shutdown Current I SHDN = SGND = PGND 0.1 1 A SHDN Shutdown to Full Operation t 180 s SON Input Impedance R MAX9724D, measured at IN 12 19 28 k IN Output Offset Voltage V T = +25C (Note 4) 1.5 10 mV OS A V = 2.7V to 5.5V, T = +25C 69 86 DD A Power-Supply Rejection Ratio PSRR f = 1kHz, 100mV (Note 4) 80 dB P-P f = 20kHz, 100mV (Note 4) 65 P-P R = 32, THD+N = 1% 30 63 L Output Power (TQFN) P mW OUT R = 16, THD+N = 1% 42 L R = 32, THD+N = 1% 25 45 L Output Power (UCSP) P mW OUT R = 16, THD+N = 1% 35 L Voltage Gain A MAX9724D (Note 5) -1.52 -1.5 -1.48 V/V V Channel-to-Channel Gain Tracking MAX9724D 0.15 % R = 1k, V = 2V , f = 1kHz 0.003 L OUT RMS IN Total Harmonic Distortion Plus THD+N R = 32, P = 50mW, f = 1kHz 0.02 % L OUT IN Noise (TQFN) (Note 6) R = 16, P = 35mW, f = 1kHz 0.04 L OUT IN R = 1k, V = 2V , f = 1kHz 0.003 L OUT RMS IN Total Harmonic Distortion Plus THD+N R = 32, P = 45mW, f = 1kHz 0.03 % L OUT IN Noise (UCSP) (Note 6) R = 16, P = 32mW, f = 1kHz 0.05 L OUT IN BW = 22Hz to 22kHz 102 R = 1k, L V = 2V OUT RMS A-weighted 105 Signal-to-Noise Ratio SNR dB BW = 22Hz to 22kHz 98 R = 32, L P = 50mW OUT A-weighted 101 2 MAX9724C/MAX9724D