MAX9723 19-3509 Rev 2 8/08 Stereo DirectDrive Headphone Amplifier 2 with BassMax, Volume Control, and I C General Description Features The MAX9723 stereo DirectDrive headphone amplifier 62mW, DirectDrive Headphone Amplifier with BassMax and volume control is ideal for portable Eliminates Bulky DC-Blocking Capacitors audio applications where space is at a premium and per- 1.8V to 3.6V Single-Supply Operation formance is essential. The MAX9723 operates from a sin- Integrated 32-Level Volume Control gle 1.8V to 3.6V power supply and includes features that reduce external component count, system cost, board High 90dB PSRR at 1kHz space, and improves audio reproduction. Low 0.006% THD+N The headphone amplifier uses Maxims DirectDrive Industry-Leading Click-and-Pop Suppression architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC- 8kV HBM ESD-Protected Headphone Outputs blocking capacitors. The headphone amplifiers deliver Short-Circuit and Thermal-Overload Protection 62mW into a 16 load, feature low 0.006% THD+N, and Low-Power Shutdown Mode (5A) high 90dB PSRR. The MAX9723 features Maxims indus- try-leading click-and-pop suppression. Software-Enabled Bass Boost (BassMax) 2 The BassMax feature boosts the bass response of the I C/SMBus-Compatible Interface amplifier, improving audio reproduction when using Available in Space-Saving, Thermally Efficient inexpensive headphones. The integrated volume con- Packages: trol features 32 discrete volume levels, eliminating the 16-Bump UCSP (2mm x 2mm x 0.62mm) need for an external potentiometer. BassMax and the 16-Pin Thin QFN (4mm x 4mm x 0.8mm) 2 volume control are enabled through the I C/SMBus- compatible interface. Shutdown is controlled through Ordering Information either the hardware or software interfaces. PIN- PKG The MAX9723 consumes only 3.7mA of supply current PART** TEMP RANGE PACKAGE CODE at 1.8V, provides short-circuit and thermal-overload protection, and is fully specified over the extended MAX9723 EBE-T* -40C to +85C 16 UCSP-16 B16-1 -40C to +85C temperature range. The MAX9723 is 16 TQFN MAX9723 ETE+ -40C to +85C T1644-4 available in a tiny (2mm x 2mm x 0.62mm) 16-bump **Replace the with the one-letter code that denotes the chip-scale package (UCSP) or 16-pin thin QFN (4mm slave address and maximum programmable gain. See the x 4mm x 0.8mm) package. Selector Guide. Applications +Denotes a lead-free/RoHS-compliant package. *Future productcontact factory for availability. PDA Audio MP3-Enabled Cellular Phones Portable CD Players Pin Configurations appear at end of data sheet. MP3 Players Mini Disc Players Block Diagram Automotive Multimedia 1.8V TO 3.6V SUPPLY Selector Guide PART SLAVE ADDRESS MAXIMUM GAIN (dB) SCL MAX9723A 1001100 0 2 I C INTERFACE SDA BBL MAX9723B 1001101 0 MAX9723C 1001100 +6 OUTL MAX9723D 1001101 +6 BassMax DirectDrive is a registered trademark of Maxim Integrated INL Products, Inc. OUTR VOLUME INR CONTROL SMBus is a trademark of Intel Corp. BBR UCSP is a trademark of Maxim Integrated Products, Inc. BassMax MAX9723 Maxim Integrated Products 1 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. EVALUATION KIT AVAILABLEStereo DirectDrive Headphone Amplifier 2 with BassMax, Volume Control, and I C ABSOLUTE MAXIMUM RATINGS SGND to PGND .....................................................-0.3V to +0.3V Continuous Current Into/Out of: V to PGND............................................................-0.3V to +4V V , C1P, PGND, C1N, PV , SV , or OUT ..............0.85A DD DD SS SS PV to SV .........................................................-0.3V to +0.3V Any Other Pin.................................................................20mA SS SS C1P to PGND..............................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) DD A C1N to PGND............................................(PV - 0.3V) to +0.3V 4 x 4 UCSP (derate 8.2mW/C above +70C) ...........659.2mW SS PV , SV to PGND ................................................+0.3V to -4V 16-Pin Thin QFN (derate 16.9mW/C above +70C) ....1349mW SS SS IN to SGND ..................................(SV - 0.3V) to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C SS DD SDA, SCL to PGND ..................................................-0.3V to +4V Junction Temperature......................................................+150C SHDN to PGND ..........................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C DD OUT to SGND ............................................................-3V to +3V Bump Temperature (soldering) BB to SGND...............................................................-2V to +2V Reflow ...........................................................................+230C Duration of OUT Short Circuit to GND....................Continuous Lead Temperature (soldering, 10s) .................................+300C 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 = SHDN = 3V, PGND = SGND = 0V, C1 = C2 = 1F, BB = 0V. gain = 0dB, maximum volume, BassMax disabled. Load connect- DD ed between OUT and SGND where specified. T = T to T , unless otherwise noted. Typical values are at T = +25C.) (Note 1) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL Supply Voltage Range V 1.8 3.6 V DD Quiescent Supply Current I No load 4 6.5 mA DD Shutdown Supply Current I V = 0V 5 8.5 A DD SHDN SHDN Turn-On Time t 200 s ON Turn-Off Time t 35 s OFF Thermal Shutdown Threshold T +143 C THRES Thermal Shutdown Hysteresis T 12 C HYST HEADPHONE AMPLIFIER Gain = 0dB, MAX9723A/ 0.7 4.5 M easured b etwee n MAX9723B Output Offset Voltage V OU T and S GN D mV OS Gain = +6dB, ( N ote 2) MAX9723C/ 0.8 5 MAX9723D Input Resistance R All volume levels 10 17 27 k IN BBR, BBL Input Bias Current I 10 100 nA BIAS BB DC, V = 1.8V to 3.6V 73 90 DD f = 217Hz, 100mV ripple, P-P 87 V = 3.0V DD Power-Supply Rejection Ratio PSRR (Note 2) dB f = 1kHz, 100mV ripple, P-P 86 V = 3.0V DD f = 20kHz, 100mV ripple, P-P 61 V = 3.0V DD 2 MAX9723