MAX9722A/MAX9722B 19-3049 Rev 2 10/07 5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown General Description Features The MAX9722A/MAX9722B stereo headphone amplifiers 2.4V to 5.5V Single-Supply Operation are designed for portable equipment where board space High PSRR (80dB at 217Hz) Eliminates LDO is at a premium. The MAX9722A/MAX9722B use a unique DirectDrive architecture to produce a ground-ref- No Bulky DC-Blocking Capacitors Required erenced output from a single supply, eliminating the Ground-Referenced Outputs Eliminate DC Bias need for large DC-blocking capacitors, which saves cost, board space, and component height. Additionally, Voltage on Headphone Ground Pin the gain of the amplifier is set internally No Degradation of Low-Frequency Response Due (-2V/V, MAX9722B) or adjusted externally (MAX9722A). to Output Capacitors The MAX9722A/MAX9722B deliver up to 70mW per Differential Inputs for Enhanced Noise channel into a 16 load or 130mW into a 32 load and have low 0.009% THD+N. An 80dB at 217Hz power-sup- Cancellation ply rejection ratio (PSRR) allows these devices to operate Adjustable Gain (MAX9722A) or Fixed -2V/V Gain from noisy digital supplies without an additional linear (MAX9722B) regulator. The MAX9722A/MAX9722B include 8kV ESD protection on the headphone outputs. Comprehensive 130mW per Channel into 32 anticlick-and-pop circuitry suppresses audible clicks Low 0.009% THD+N and pops on startup and shutdown. A low-power shut- down mode reduces the supply current to 0.1A. Integrated Click-and-Pop Suppression The MAX9722A/MAX9722B operate from a single 2.4V Low Quiescent Current (5.5mA) to 5.5V supply, consume only 5.5mA of supply current, Short-Circuit and Thermal-Overload Protection feature short-circuit and thermal-overload protection, and are specified over the extended -40C to +85C 8kV ESD-Protected Amplifier Outputs (Human temperature range. The devices are available in tiny Body Model) 16-pin thin QFN (3mm 3mm 0.8mm) and 16-pin TSSOP packages. Available in a Space-Saving 16-Pin Thin QFN (3mm 3mm 0.8mm) Package Applications Notebook and Smart Phones Simplified Diagram Desktop PCs PDAs MP3 Players Portable Audio Flat-Panel Monitors Equipment Cellular Phones DirectDrive OUTPUTS LEFT ELIMINATE DC-BLOCKING AUDIO CAPACITORS. INPUT Ordering Information TOP PKG PART PIN-PACKAGE MARK CODE SHDN MAX9722B 16 Thin QFN-EP* (3mm MAX9722AETE AAX T1633-5 3mm 0.8mm) MAX9722AEUE 16 TSSOP U16-1 RIGHT FIXED GAIN ELIMINATES 16 Thin QFN-EP* (3mm AUDIO MAX9722BETE AAY T1633-5 EXTERNAL RESISTOR 3mm 0.8mm) INPUT NETWORK. MAX9722BEUE 16 TSSOP U16-1 Note: All devices are specified over the -40C to +85C operating temperature range. Pin Configurations and Typical Application Circuit appear at *EP = Exposed paddle. end of data sheet. 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 AVAILABLE5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown ABSOLUTE MAXIMUM RATINGS PGND to SGND .....................................................-0.3V to +0.3V PV to SV ............................................................................0V SS SS PV and SV to PGND or SGND .........................-0.3V to +6V Output Short Circuit to GND.......................................Continuous DD DD PV and SV to PGND..........................................+0.3V to -6V Continuous Power Dissipation (T = +70C) SS SS A IN to SGND ................................(SV - 0.3V) to (SV + 0.3V) 16-Pin Thin QFN (derate 14.7mW/C above +70C)....1176mW SS DD OUT to PGND ......................................................-3.0V to +3.0V 16-Pin TSSOP (derate 9.4mW/C above +70C) .........755mW SHDN to SGND..........................(SGND - 0.3V) to (SV + 0.3V) Junction Temperature......................................................+150C DD C1P to PGND ...........................................-0.3V to (PV + 0.3V) Operating Temperature Range............................-40C to +85C DD C1N to PGND............................................(SV - 0.3V) to +0.3V Storage Temperature Range .............................-65C to +150C SS PV to SV ...........................................................................0V Lead Temperature (soldering, 10s) .................................+300C DD 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 (PV = SV = +5V, PGND = SGND = 0V, SHDN = SV , C1 = C2 = 1F, R = , resistive load referenced to ground, for DD DD DD L MAX9722A gain = -1V/V (R = R = 10k), for MAX9722B gain = -2V/V (internally set), T = -40C to +85C, unless otherwise noted. IN F A Typical values are at T = +25C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL Supply Voltage Range V Guaranteed by PSRR test 2.4 5.5 V DD Quiescent Supply Current I R = 5.5 13 mA DD L Shutdown Supply Current I SHDN = SGND 0.1 2A SHDN SHDN Input Logic High V 2V IH SHDN Input Logic Low V 0.8 V IL SHDN Input Leakage Current -1 +0.05 +1 A SHDN to Full Operation Time t 80 s SON AMPLIFIERS Voltage Gain A MAX9722B (Note 2) -1.98 -2 -2.02 V/V V Gain Matching MAX9722B, between the right and left channels 2% Between IN + and IN -, AC-coupled (MAX9722A) 0.5 2.5 Input Offset Voltage V mV IS Between IN + and IN -, AC-coupled (MAX9722B) 1.5 5 Input Bias Current I IN + and IN - 50 nA BIAS Input Impedance R MAX9722B, measured at IN 10 14.4 20 k IN Input Common-Mode Voltage V -0.5 +0.7 V CM Range Common-Mode Rejection Ratio CMRR Input referred, MAX9722A, T = +25C -60 -70 dB A DC, V = 2.4V to 5.5V, input referred -80 -90 DD Power-Supply Rejection Ratio PSRR f = 217Hz, 100mV ripple, input referred -80 dB P-P (Note 3) f = 10kHz, 100mV ripple, input referred -50 P-P R = 16, THD+N = 1%, T = +25C 60 70 L A Output Power P mW OUT R = 32, THD+N = 1%, T = +25C 130 L A Output Voltage V R = 1k 2 V OUT L RMS Output Impedance in Shutdown 10 k 2 MAX9722A/MAX9722B