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| 19-2386; Rev 2; 10/02 80mW, DirectDrive Stereo Headphone Driver with Shutdown General Description The MAX4410 stereo headphone driver is designed for portable equipment where board space is at a premium. The MAX4410 uses a unique, patented, DirectDrive architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. The MAX4410 delivers up to 80mW per channel into a 16 load and has low 0.003% THD + N. A high powersupply rejection ratio (90dB at 1kHz) allows this device to operate from noisy digital supplies without an additional linear regulator. The MAX4410 includes 8kV ESD protection on the headphone outputs. Comprehensive clickand-pop circuitry suppresses audible clicks and pops on startup and shutdown. Independent left/right, low-power shutdown controls make it possible to optimize power savings in mixed mode, mono/stereo applications. The MAX4410 operates from a single 1.8V to 3.6V supply, consumes only 7mA of supply current, has short-circuit and thermal overload protection, and is specified over the extended -40C to +85C temperature range. The MAX4410 is available in a tiny (2mm x 2mm x 0.6mm), 16-bump chip-scale package (UCSPTM) and a 14-pin TSSOP package. Features o No Bulky DC-Blocking Capacitors Required o Ground-Referenced Outputs Eliminate DC-Bias Voltages on Headphone Ground Pin o No Degradation of Low-Frequency Response Due to Output Capacitors o 80mW Per Channel into 16 o Low 0.003% THD + N o High PSRR (90dB at 1kHz) o Integrated Click-and-Pop Suppression o 1.8V to 3.6V Single-Supply Operation o Low Quiescent Current o Independent Left/Right, Low-Power Shutdown Controls o Short-Circuit and Thermal Overload Protection o 8kV ESD-Protected Amplifier Outputs o Available in Space-Saving Packages 16-Bump UCSP (2mm x 2mm x 0.6mm) 14-Pin TSSOP MAX4410 Ordering Information PART MAX4410EBE-T* MAX4410EUD TEMP RANGE -40C to +85C -40C to +85C PIN/BUMPPACKAGE 16 UCSP-16 14 TSSOP Applications Notebooks Cellular Phones PDAs MP3 Players Web Pads Portable Audio Equipment *Future product--contact factory for availability. Functional Diagram LEFT AUDIO INPUT MAX4410 SHDNL SHDNR RIGHT AUDIO INPUT UCSP is a trademark of Maxim Integrated Products, Inc. Pin Configurations and Typical Application Circuit appear at end of data sheet. 1 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 ABSOLUTE MAXIMUM RATINGS PGND to SGND .....................................................-0.3V to +0.3V PVDD to SVDD .................................................................-0.3V to +0.3V PVSS to SVSS .........................................................-0.3V to +0.3V PVDD and SVDD to PGND or SGND .........................-0.3V to +4V PVSS and SVSS to PGND or SGND ..........................-4V to +0.3V IN_ to SGND ..........................................................-0.3V to +0.3V SHDN_ to SGND........................(SGND - 0.3V) to (SVDD + 0.3V) OUT_ to SGND ............................(SVSS - 0.3V) to (SVDD + 0.3V) C1P to PGND.............................(PGND - 0.3V) to (PVDD + 0.3V) C1N to PGND .............................(PVSS - 0.3V) to (PGND + 0.3V) Output Short Circuit to GND or VDD ...........................Continuous Continuous Power Dissipation (TA = +70C) 14-Pin TSSOP (derate 9.1mW/C above +70C) ..........727mW 16-Bump UCSP (derate 15.2mW/C above +70C)....1212mW Junction Temperature ......................................................+150C Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Bump Temperature (soldering) (Note 1) Infrared (15s) ...............................................................+220C Vapor Phase (60s) .......................................................+215C Lead Temperature (soldering, 10s) .................................+300C Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed. 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 (PVDD = SVDD = 3V, PGND = SGND = 0, SHDNL = SHDNR = SVDD, C1 = C2 = 2.2F, RIN = RF = 10k, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER Supply Voltage Range Quiescent Supply Current Shutdown Supply Current SYMBOL VDD IDD I SHDN CONDITIONS Guaranteed by PSRR test One channel enabled Two channels enabled SHDNL = SHDNR = GND VIH SHDN_ Thresholds VIL SHDN_ Input Leakage Current SHDN_ to Full Operation CHARGE PUMP Oscillator Frequency AMPLIFIERS Input Offset Voltage Input Bias Current Power-Supply Rejection Ratio VOS IBIAS 1.8V VDD 3.6V PSRR 200mVP-P ripple THD + N = 1% DC fRIPPLE = 1kHz fRIPPLE = 20kHz RL = 32 RL = 16 40 Input AC-coupled, RL = 32 -100 75 90 90 55 65 80 mW dB 0.5 2.4 +100 mV nA fOSC 272 320 368 kHz tSON -1 175 0.7 x SVDD 0.3 x SVDD +1 A s MIN 1.8 4 7 6 11.5 10 TYP MAX 3.6 UNITS V mA A V Output Power POUT 2 _______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown ELECTRICAL CHARACTERISTICS (continued) (PVDD = SVDD = 3V, PGND = SGND = 0, SHDNL = SHDNR = SVDD, C1 = C2 = 2.2F, RIN = RF = 10k, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio Slew Rate Maximum Capacitive Load Crosstalk Thermal Shutdown Threshold Thermal Shutdown Hysteresis ESD Protection Human body model (OUTR, OUTL) SYMBOL CONDITIONS RL = 32, POUT = 25mW RL = 16, POUT = 50mW MIN TYP 0.003 % 0.003 95 0.8 No sustained oscillations RL = 16, POUT = 1.6mW, fIN = 10kHz 300 70 140 15 8 dB V/s pF dB C C kV MAX UNITS MAX4410 THD + N fIN = 1kHz SNR SR CL RL = 32, POUT = 20mW, fIN = 1kHz Note 2: All specifications are 100% tested at TA = +25C; temperature limits are guaranteed by design. Typical Operating Characteristics (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1 VDD = 3V AV = -1V/V RL = 16 0.1 THD + N (%) THD + N (%) POUT = 25mW POUT = 50mW POUT = 10mW 0.1 MAX4410 toc01 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1 VDD = 3V AV = -2V/V RL = 16 POUT = 10mW THD + N (%) 0.01 MAX4410 toc02 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY VDD = 3V AV = -1V/V RL = 32 MAX4410 toc03 1 0.1 POUT = 5mW POUT = 10mW POUT = 25mW 0.01 0.01 0.001 POUT = 50mW POUT = 25mW 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 _______________________________________________________________________________________ 3 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX4410 toc04 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1 VDD = 1.8V AV = -1V/V RL = 16 0.1 THD + N (%) THD + N (%) POUT = 5mW POUT = 10mW 0.1 MAX4410 toc05 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY 1 VDD = 1.8V AV = -2V/V RL = 16 MAX4410 toc06 1 VDD = 3V AV = -2V/V RL = 32 0.1 THD + N (%) POUT = 5mW 0.01 POUT = 10mW POUT = 5mW 0.01 0.01 POUT = 10mW POUT = 25mW 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 POUT = 20mW 0.001 1k FREQUENCY (Hz) 10k 100k 10 100 POUT = 20mW 1k FREQUENCY (Hz) 10k 100k TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX4410 toc07 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX4410 toc08 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 3V AV = -1V/V RL = 16 fIN = 20Hz MAX4410 toc09 1 VDD = 1.8V AV = -1V/V RL = 32 0.1 THD + N (%) POUT = 20mW POUT = 10mW 0.01 POUT = 5mW 1 VDD = 1.8V AV = -2V/V RL = 32 0.1 100 10 THD + N (%) THD + N (%) 1 OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE POUT = 5mW 0.01 0.1 POUT = 10mW 0.01 POUT = 20mW ONE CHANNEL 0 50 100 150 200 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 0.001 OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc11 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 3V AV = -2V/V RL = 16 fIN = 20Hz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE MAX4410 toc12 100 VDD = 3V AV = -1V/V RL = 16 fIN = 1kHz 100 VDD = 3V AV = -1V/V RL = 16 fIN = 10kHz 100 10 10 10 THD + N (%) THD + N (%) THD + N (%) 1 OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE 1 OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE ONE CHANNEL 1 0.1 0.1 0.1 0.01 0.001 0 50 100 ONE CHANNEL 150 200 0.01 0.001 0 50 100 150 200 0.01 0.001 0 50 100 ONE CHANNEL 150 200 OUTPUT POWER (mW) OUTPUT POWER (mW) OUTPUT POWER (mW) 4 _______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc13 MAX4410 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc14 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 3V OUTPUTS IN AV = -1V/V PHASE RL = 32 fIN = 20Hz ONE CHANNEL OUTPUTS 180 OUT OF PHASE MAX4410 toc15 100 VDD = 3V AV = -2V/V RL = 16 fIN = 1kHz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE 100 VDD = 3V AV = -2V/V RL = 16 fIN = 10kHz OUTPUTS IN PHASE 100 10 1 10 10 THD + N (%) THD + N (%) 1 1 THD + N (%) 0.1 0.1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0.1 0.01 0.01 ONE CHANNEL 0.001 0 50 100 150 200 OUTPUT POWER (mW) 0.01 0.001 0 50 100 0.001 0.0001 150 200 0 25 50 75 100 125 OUTPUT POWER (mW) OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc16 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc17 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 3V AV = -1V/V RL = 32 fIN = 20Hz OUTPUTS IN PHASE MAX4410 toc18 100 VDD = 3V AV = -1V/V RL = 32 fIN = 1kHz OUTPUTS IN PHASE 100 VDD = 3V AV = -1V/V RL = 32 fIN = 10kHz OUTPUTS IN PHASE 100 10 10 10 THD + N (%) THD + N (%) 1 OUTPUTS 180 OUT OF PHASE THD + N (%) 1 OUTPUTS 180 OUT OF PHASE 1 OUTPUTS 180 OUT OF PHASE 0.1 ONE CHANNEL 0.1 0.1 ONE CHANNEL ONE CHANNEL 0.01 0.001 0 0.01 0.001 25 50 75 100 125 0 25 50 75 100 125 OUTPUT POWER (mW) OUTPUT POWER (mW) 0.01 0.001 0 25 50 75 100 125 OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc19 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc20 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 1.8V AV = -1V/V RL = 16 fIN = 20Hz OUTPUTS IN PHASE MAX4410 toc21 100 VDD = 3V AV = -2V/V RL = 32 fIN = 1kHz OUTPUTS IN PHASE 100 VDD = 3V AV = -2V/V RL = 32 fIN = 10kHz OUTPUTS IN PHASE 100 10 10 10 THD + N (%) THD + N (%) 1 OUTPUTS 180 OUT OF PHASE 1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL THD + N (%) 1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0 10 20 30 40 50 60 0.1 ONE CHANNEL 0.1 0.1 0.01 0.001 0 0.01 0.001 0.01 0.001 0 25 50 75 100 125 OUTPUT POWER (mW) 25 50 75 100 125 OUTPUT POWER (mW) OUTPUT POWER (mW) _______________________________________________________________________________________ 5 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc22 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc23 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 1.8V AV = -2V/V RL = 16 fIN = 20Hz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE ONE CHANNEL MAX4410 toc24 100 VDD = 1.8V AV = -1V/V RL = 16 fIN = 1kHz OUTPUTS IN PHASE 100 VDD = 1.8V AV = -1V/V RL = 16 fIN = 10kHz 100 10 10 10 THD + N (%) THD + N (%) 1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0 10 20 30 40 50 60 1 OUTPUTS IN PHASE 0.1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL THD + N (%) 1 0.1 0.1 0.01 0.001 0.01 0.001 0 10 20 30 40 0.01 0.001 50 60 0 10 20 30 40 50 60 OUTPUT POWER (mW) OUTPUT POWER (mW) OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc25 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc26 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 1.8V AV = -1V/V RL = 32 fIN = 20Hz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE MAX4410 toc27 100 VDD = 1.8V AV = -2V/V RL = 16 fIN = 1kHz OUTPUTS IN PHASE 100 VDD = 1.8V AV = -2V/V RL = 16 fIN = 10kHz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0 10 20 30 40 50 100 10 10 10 THD + N (%) THD + N (%) THD + N (%) 1 1 1 0.1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0.1 0.1 0.01 0.001 0 10 20 30 0.01 0.001 0.01 ONE CHANNEL 0.001 60 0 10 20 30 40 50 40 50 60 OUTPUT POWER (mW) OUTPUT POWER (mW) OUTPUT POWER (mW) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc28 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc29 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 1.8V AV = -2V/V RL = 32 fIN = 20Hz MAX4410 toc30 100 VDD = 1.8V AV = -1V/V RL = 32 fIN = 1kHz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE 100 VDD = 1.8V AV = -1V/V RL = 32 fIN = 10kHz 100 10 10 10 THD + N (%) THD + N (%) THD + N (%) 1 1 OUTPUTS IN PHASE 0.1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL 1 OUTPUTS IN PHASE 0.1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0 10 20 30 40 50 0.1 0.01 0.001 0 10 20 ONE CHANNEL 30 40 50 0.01 0.001 0 10 20 0.01 0.001 30 40 50 OUTPUT POWER (mW) OUTPUT POWER (mW) OUTPUT POWER (mW) 6 _______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc31 MAX4410 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER MAX4410 toc32 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY VDD = 3V RL = 16 -20 MAX4410 toc33 100 VDD = 1.8V AV = -2V/V RL = 32 fIN = 1kHz OUTPUTS IN PHASE 100 VDD = 1.8V AV = -2V/V RL = 32 fIN = 10kHz OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0 10 10 THD + N (%) THD + N (%) 0.1 OUTPUTS 180 OUT OF PHASE ONE CHANNEL PSRR (dB) 1 1 -40 0.1 -60 0.01 0.001 0 10 20 0.01 0.001 -80 -100 0 10 20 30 40 50 0.01 0.1 1 FREQUENCY (kHz) 10 100 OUTPUT POWER (mW) 30 40 50 OUTPUT POWER (mW) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX4410 toc34 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX4410 toc35 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY VDD = 1.8V RL = 32 -20 MAX4410 toc36 0 VDD = 1.8V RL = 16 -20 0 VDD = 3V RL = 32 -20 0 PSRR (dB) PSRR (dB) -60 -60 PSRR (dB) 0.01 0.1 1 FREQUENCY (kHz) 10 100 -40 -40 -40 -60 -80 -80 -80 -100 0.01 0.1 1 FREQUENCY (kHz) 10 100 -100 -100 0.01 0.1 1 FREQUENCY (kHz) 10 100 CROSSTALK vs. FREQUENCY MAX4410 toc37 OUTPUT POWER vs. SUPPLY VOLTAGE MAX4410 toc38 OUTPUT POWER vs. SUPPLY VOLTAGE fIN = 1kHz RL = 16 THD + N = 10% INPUTS 180 OUT OF PHASE MAX4410 toc39 0 VDD = 3V POUT = 1.6mW RL = 16 200 180 160 OUTPUT POWER (mW) 140 120 100 80 60 40 INPUTS IN PHASE fIN = 1kHz RL = 16 THD + N = 1% INPUTS 180 OUT OF PHASE 300 250 OUTPUT POWER (mW) 200 150 100 50 0 INPUTS IN PHASE -20 CROSSTALK (dB) -40 -60 LEFT TO RIGHT -80 RIGHT TO LEFT -100 0.01 0.1 1 FREQUENCY (Hz) 10 100 20 0 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 7 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) OUTPUT POWER vs. SUPPLY VOLTAGE MAX4410 toc40 OUTPUT POWER vs. SUPPLY VOLTAGE MAX4410 toc41 OUTPUT POWER vs. LOAD RESISTANCE 140 OUTPUT POWER (mW) 120 100 80 60 40 20 0 INPUTS IN PHASE 10 100 1k 10k 100k INPUTS 180 OUT OF PHASE VDD = 3V fIN = 1kHz THD + N = 1% MAX4410 toc42 MAX4410 toc48 MAX4410 toc45 140 120 OUTPUT POWER (mW) 100 80 60 40 20 0 1.8 2.1 2.4 2.7 3.0 3.3 INPUTS IN PHASE fIN = 1kHz RL = 32 THD + N = 1% INPUTS 180 OUT OF PHASE 180 160 140 OUTPUT POWER (mW) 120 100 80 60 40 20 0 INPUTS IN PHASE fIN = 1kHz RL = 32 THD + N = 10% INPUTS 180 OUT OF PHASE 160 3.6 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) LOAD RESISTANCE () OUTPUT POWER vs. LOAD RESISTANCE VDD = 3V fIN = 1kHz THD + N = 10% MAX4410 toc43 OUTPUT POWER vs. LOAD RESISTANCE MAX4410 toc44 OUTPUT POWER vs. LOAD RESISTANCE 70 60 OUTPUT POWER (mW) 50 40 30 20 10 0 INPUTS IN PHASE INPUTS 180 OUT OF PHASE VDD = 1.8V fIN = 1kHz THD + N = 10% 250 45 40 35 OUTPUT POWER (mW) 30 25 20 15 10 INPUTS IN PHASE INPUTS 180 OUT OF PHASE VDD = 1.8V fIN = 1kHz THD + N = 1% 200 OUTPUT POWER (mW) 150 INPUTS 180 OUT OF PHASE 100 50 INPUTS IN PHASE 0 10 100 1k 10k 100k LOAD RESISTANCE () 5 0 10 100 1k 10k 100k LOAD RESISTANCE () 10 100 1k 10k 100k LOAD RESISTANCE () POWER DISSIPATION vs. OUTPUT POWER MAX4410 toc46 POWER DISSIPATION vs. OUTPUT POWER 160 POWER DISSIPATION (mW) 140 120 100 80 60 40 20 0 fIN = 1kHz RL = 32 VDD = 3V POUT = POUTL + POUTR 0 40 80 120 160 200 INPUTS 180 OUT OF PHASE INPUTS IN PHASE MAX4410 toc47 POWER DISSIPATION vs. OUTPUT POWER 140 120 POWER DISSIPATION (mW) 100 80 60 40 20 0 0 10 20 30 40 50 60 fIN = 1kHz RL = 16 VDD = 1.8V POUT = POUTL + POUTR INPUTS IN PHASE 400 350 POWER DISSIPATION (mW) 300 250 200 150 100 50 0 0 40 80 120 fIN = 1kHz RL = 16 VDD = 3V POUT = POUTL + POUTR 180 INPUTS IN PHASE INPUTS 180 OUT OF PHASE INPUTS 180 OUT OF PHASE 160 200 OUTPUT POWER (mW) OUTPUT POWER (mW) OUTPUT POWER (mW) 8 _______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) POWER DISSIPATION vs. OUTPUT POWER MAX4410 toc49 MAX4410 GAIN AND PHASE vs. FREQUENCY 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 100 MAX4410 toc50 70 60 POWER DISSIPATION (mW) 50 40 30 20 10 0 0 10 20 30 40 50 fIN = 1kHz RL = 32 VDD = 1.8V POUT = POUTL + POUTR INPUTS 180 OUT OF PHASE INPUTS IN PHASE GAIN GAIN/PHASE (dB/DEGREES) PHASE VDD = 3V AV = 1000V/V RL = 16 1k 10k 100k 1M 10M 60 OUTPUT POWER (mW) FREQUENCY (Hz) GAIN FLATNESS vs. FREQUENCY MAX4410 toc51 CHARGE-PUMP OUTPUT RESISTANCE vs. SUPPLY VOLTAGE VIN_ = GND IPVSS = 10mA NO LOAD MAX4410 toc52 10 0 -10 GAIN (dB) -20 -30 -40 -50 10 100 1k 10k 100k 1M VDD = 3V AV = -1V/V RL = 16 10 OUTPUT RESISTANCE () 10M 8 6 4 2 0 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) FREQUENCY (Hz) OUTPUT POWER vs. CHARGE-PUMP CAPACITANCE AND LOAD RESISTANCE MAX4410 toc53 OUTPUT SPECTRUM vs. FREQUENCY VIN = 1VP-P fIN = 1kHz RL = 32 AV = -1V/V MAX4410 toc54 90 C1 = C2 = 2.2F 80 C1 = C2 = 1F 70 OUTPUT POWER (mW) 60 50 40 30 20 10 0 10 20 30 40 C1 = C2 = 0.47F fIN = 1kHz THD + N = 1% INPUTS IN PHASE C1 = C2 = 0.68F 0 -20 OUTPUT SPECTRUM (dB) -40 -60 -80 -100 -120 50 0.1 1 10 100 LOAD RESISTANCE () FREQUENCY (kHz) _______________________________________________________________________________________ 9 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Typical Operating Characteristics (continued) (C1 = C2 = 2.2F, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.) SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE SHDNL = SHDNR = GND 8 SUPPLY CURRENT (A) MAX4410 toc56 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX4410 toc55 10 10 8 SUPPLY CURRENT (mA) 6 6 4 4 2 2 0 0 0.9 1.8 2.7 3.6 SUPPLY VOLTAGE (V) 0 0 0.9 1.8 2.7 3.6 SUPPLY VOLTAGE (V) EXITING SHUTDOWN MAX4410 toc57 POWER-UP/DOWN WAVEFORM MAX4410 toc58 3V 2V/div VDD SHDNR OUT_ OUTR 500mV/div -100dB 10mV/div 0V OUT_FFT 20dB/div fIN = 1kHz RL = 32 SHDNL = GND 200s/div RL = 32 VIN_ = GND 200ms/div FFT: 25Hz/div 10 ______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown Pin Description PIN TSSOP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 BUMP NAME UCSP B2 A3 A4 B4 C4 D4 D3 D2 D1 C1 C2 B1 A1 A2 SHDNL PVDD C1P PGND C1N PVSS SVSS OUTL SVDD INL OUTR SHDNR INR SGND Active-Low, Left-Channel Shutdown. Connect to VDD for normal operation. Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and oscillator. Flying Capacitor Positive Terminal Power Ground. Connect to SGND. Flying Capacitor Negative Terminal Charge-Pump Output Amplifier Negative Power Supply. Connect to PVSS. Left-Channel Output Amplifier Positive Power Supply. Connect to PVDD. Left-Channel Audio Input Right-Channel Output Active-Low, Right-Channel Shutdown. Connect to VDD for normal operation. Right-Channel Audio Input Signal Ground. Connect to PGND. FUNCTION MAX4410 ______________________________________________________________________________________ 11 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Detailed Description The MAX4410 stereo headphone driver features Maxim's patented DirectDrive architecture, eliminating the large output-coupling capacitors required by traditional singlesupply headphone drivers. The device consists of two 80mW Class AB headphone drivers, undervoltage lockout (UVLO)/shutdown control, charge-pump, and comprehensive click-and-pop suppression circuitry (see Typical Application Circuit). The charge pump inverts the positive supply (PV DD ), creating a negative supply (PVSS). The headphone drivers operate from these bipolar supplies with their outputs biased about GND (Figure 1). The drivers have almost twice the supply range compared to other 3V single-supply drivers, increasing the available output power. The benefit of this GND bias is that the driver outputs do not have a DC component typically VDD/2. Thus, the large DC-blocking capacitors are unnecessary, improving frequency response while conserving board space and system cost. Each channel has independent left/right, active-low shutdown controls, making it possible to optimize power savings in mixed-mode, mono/stereo operation. The device features an undervoltage lockout that prevents operation from an insufficient power supply and click-and-pop suppression that eliminates audible transients on startup and shutdown. Additionally, the MAX4410 features thermal overload and short-circuit protection and can withstand 8kV ESD strikes on the output pins. VDD VOUT VDD/2 GND CONVENTIONAL DRIVER-BIASING SCHEME +VDD VOUT GND -VDD DirectDrive BIASING SCHEME DirectDrive Traditional single-supply headphone drivers have their outputs biased about a nominal DC voltage (typically half the supply) for maximum dynamic range. Large coupling capacitors are needed to block this DC bias from the headphone. Without these capacitors, a significant amount of DC current flows to the headphone, resulting in unnecessary power dissipation and possible damage to both headphone and headphone driver. Maxim's patented DirectDrive architecture uses a charge pump to create an internal negative supply voltage. This allows the outputs of the MAX4410 to be biased about GND, almost doubling dynamic range while operating from a single supply. With no DC component, there is no need for the large DC-blocking capacitors. Instead of two large (220F, typ) tantalum capacitors, the MAX4410 charge pump requires two small ceramic capacitors, conserving board space, reducing cost, and improving the frequency response of the headphone driver. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics for 12 Figure 1. Traditional Driver Output Waveform vs. MAX4410 Output Waveform details of the possible capacitor sizes. There is a low DC voltage on the driver outputs due to amplifier offset. However, the offset of the MAX4410 is typically 0.5mV, which, when combined with a 32 load, results in less than 16A of DC current flow to the headphones. Previous attempts to eliminate the output-coupling capacitors involved biasing the headphone return (sleeve) to the DC-bias voltage of the headphone amplifiers. This method raises some issues: 1) When combining a microphone and headphone on a single connector, the microphone bias scheme typically requires a 0V reference. 2) The sleeve is typically grounded to the chassis. Using this biasing approach, the sleeve must be isolated from system ground, complicating product design. 3) During an ESD strike, the driver's ESD structures are the only path to system ground. Thus, the driver must be able to withstand the full ESD strike. ______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown 4) When using the headphone jack as a line out to other equipment, the bias voltage on the sleeve may conflict with the ground potential from other equipment, resulting in possible damage to the drivers. Low-Frequency Response In addition to the cost and size disadvantages of the DCblocking capacitors required by conventional headphone amplifiers, these capacitors limit the amplifier's low-frequency response and can distort the audio signal. 1) The impedance of the headphone load and the DCblocking capacitor form a highpass filter with the -3dB point set by: f -3dB = 1 2RLCOUT Charge Pump The MAX4410 features a low-noise charge pump. The 320kHz switching frequency is well beyond the audio range, and thus does not interfere with the audio signals. The switch drivers feature a controlled switching speed that minimizes noise generated by turn-on and turn-off transients. By limiting the switching speed of the switches, the di/dt noise caused by the parasitic bond wire and trace inductance is minimized. Although not typically required, additional high-frequency noise attenuation can be achieved by increasing the size of C2 (see Typical Application Circuit). LF ROLL OFF (16 LOAD) -3 -5 ATTENUATION (dB) -10 100F -15 33F -20 -25 -30 -35 10 100 FREQUENCY (Hz) 1k 330F 220F -3dB CORNER FOR 100F IS 100Hz MAX4410 fig02 MAX4410 0 where RL is the headphone impedance and COUT is the DC-blocking capacitor value. The highpass filter is required by conventional single-ended, single power-supply headphone drivers to block the midrail DC bias component of the audio signal from the headphones. The drawback to the filter is that it can attenuate low-frequency signals. Larger values of COUT reduce this effect but result in physically larger, more expensive capacitors. Figure 2 shows the relationship between the size of COUT and the resulting low-frequency attenuation. Note that the -3dB point for a 16 headphone with a 100F blocking capacitor is 100Hz, well within the normal audio band, resulting in low-frequency attenuation of the reproduced signal. 2) The voltage coefficient of the DC-blocking capacitor contributes distortion to the reproduced audio signal as the capacitance value varies as a function of the voltage change across the capacitor. At low frequencies, the reactance of the capacitor dominates at frequencies below the -3dB point and the voltage coefficient appears as frequency-dependent distortion. Figure 3 shows the THD + N introduced by two different capacitor dielectric types. Note that below 100Hz, THD + N increases rapidly. The combination of low-frequency attenuation and frequency-dependent distortion compromises audio reproduction in portable audio equipment that emphasizes low-frequency effects such as multimedia laptops, as well as MP3, CD, and DVD players. By eliminating the DC-blocking capacitors through DirectDrive technology, these capacitor-related deficiencies are eliminated. Figure 2. Low-Frequency Attenuation for Common DC-Blocking Capacitor Values ADDITIONAL THD + N DUE TO DC-BLOCKING CAPACITORS MAX4410 fig03 10 1 THD + N (%) 0.1 TANTALUM 0.01 0.001 ALUM/ELEC 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k Figure 3. Distortion Contributed by DC-Blocking Capacitors ______________________________________________________________________________________ 13 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Shutdown The MAX4410 features two shutdown controls allowing either channel to be shut down or muted independently. SHDNL controls the left channel while SHDNR controls the right channel. Driving either SHDN_ low disables the respective channel, sets the driver output impedance to about 1k, and reduces the supply current to less than 10A. When both SHDN_ inputs are driven low, the charge pump is also disabled, further reducing supply current draw to 6A. The charge pump is enabled once either SHDN_ input is driven high. C/W as specified in the Absolute Maximum Ratings section. For example, JA of the TSSOP package is +109.9C/W. The MAX4410 has two sources of power dissipation, the charge pump and the two drivers. If the power dissipation for a given application exceeds the maximum allowed for a given package, either reduce V DD , increase load impedance, decrease the ambient temperature, or add heat sinking to the device. Large output, supply, and ground traces improve the maximum power dissipation in the package. Thermal overload protection limits total power dissipation in the MAX4410. When the junction temperature exceeds +140C, the thermal protection circuitry disables the amplifier output stage. The amplifiers are enabled once the junction temperature cools by 15C. This results in a pulsing output under continuous thermal overload conditions. Output Power The device has been specified for the worst-case scenario-- when both inputs are in phase. Under this condition, the drivers simultaneously draw current from the charge pump, leading to a slight loss in headroom of VSS. In typical stereo audio applications, the left and right signals have differences in both magnitude and phase, subsequently leading to an increase in the maximum attainable output power. Figure 4 shows the two extreme cases for in and out of phase. In reality, the available power lies between these extremes. Click-and-Pop Suppression In traditional single-supply audio drivers, the outputcoupling capacitor is a major contributor of audible clicks and pops. Upon startup, the driver charges the coupling capacitor to its bias voltage, typically half the supply. Likewise, on shutdown the capacitor is discharged to GND. This results in a DC shift across the capacitor, which in turn, appears as an audible transient at the speaker. Since the MAX4410 does not require output-coupling capacitors, this does not arise. Additionally, the MAX4410 features extensive click-andpop suppression that eliminates any audible transient sources internal to the device. The Power-Up/Down Waveform in the Typical Operating Characteristics shows that there are minimal spectral components in the audible range at the output upon startup or shutdown. In most applications, the output of the preamplifier driving the MAX4410 has a DC bias of typically half the supply. At startup, the input-coupling capacitor is charged to the preamplifier's DC-bias voltage through the RF of the MAX4410, resulting in a DC shift across the capacitor and an audible click/pop. Delaying the rise of the MAX4410's SHDN_ signals 4 to 5 time constants (200ms to 300ms) based on RIN and CIN relative to the start of the preamplifier eliminates this click/pop caused by the input filter. TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER VDD = 3V AV = -1V/V RL = 16 fIN = 10kHz MAX4410 fig04 100 10 THD + N (%) Applications Information Power Dissipation Under normal operating conditions, linear power amplifiers can dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute Maximum Ratings section under Continuous Power Dissipation or can be calculated by the following equation: TJ(MAX) - TA PDISSPKG(MAX) = JA where TJ(MAX) is +150C, TA is the ambient temperature, and JA is the reciprocal of the derating factor in 14 1 OUTPUTS IN PHASE OUTPUTS 180 OUT OF PHASE ONE CHANNEL 0.1 0.01 0.001 0 50 100 150 200 OUTPUT POWER (mW) Figure 4. Output Power vs. Supply Voltage with Inputs In/Out of Phase ______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Powering Other Circuits from a Negative Supply An additional benefit of the MAX4410 is the internally generated, negative supply voltage (-VDD). This voltage is used by the MAX4410 to provide the ground-referenced output level. It can, however, also be used to power other devices within a design. Current draw from this negative supply (PVSS) should be limited to 5mA, exceeding this will affect the operation of the headphone driver. The negative supply voltage appears on the PVSS pin. A typical application is a negative supply to adjust the contrast of LCD modules. When considering the use of PVSS in this manner, note that the charge-pump voltage at PVSS is roughly proportional to -VDD and is not a regulated voltage. The charge-pump output impedance plot appears in the Typical Operating Characteristics. an optimum DC level. Assuming zero-source impedance, the -3dB point of the highpass filter is given by: f -3dB = 1 2RINCIN Component Selection Gain-Setting Resistors External feedback components set the gain of the MAX4410. Resistors RF and RIN (see Typical Application Circuit) set the gain of each amplifier as follows: R AV = - F RIN To minimize VOS, set RF equal to 10k. Values other than 10k increase VOS due to the input bias current, which in turn increases the amount of DC current flow to the speaker. Compensation Capacitor The stability of the MAX4410 is affected by the value of the feedback resistor (RF). The combination of RF and the input and parasitic trace capacitance introduces an additional pole. Adding a capacitor in parallel with RF compensates for this pole. Under typical conditions with proper layout, the device is stable without the additional capacitor. Input Filtering The input capacitor (CIN), in conjunction with RIN, forms a highpass filter that removes the DC bias from an incoming signal (see Typical Application Circuit). The AC-coupling capacitor allows the amplifier to bias the signal to Choose RIN according to the Gain-Setting Resistors section. Choose the CIN such that f-3dB is well below the lowest frequency of interest. Setting f-3dB too high affects the low-frequency response of the amplifier. Use capacitors whose dielectrics have low-voltage coefficients, such as tantalum or aluminum electrolytic. Capacitors with high-voltage coefficients, such as ceramics, may result in increased distortion at low frequencies. Other considerations when designing the input filter include the constraints of the overall system and the actual frequency band of interest. Although high-fidelity audio calls for a flat-gain response between 20Hz and 20kHz, portable voice-reproduction devices such as cellular phones and two-way radios need only concentrate on the frequency range of the spoken human voice (typically 300Hz to 3.5kHz). In addition, speakers used in portable devices typically have a poor response below 150Hz. Taking these two factors into consideration, the input filter may not need to be designed for a 20Hz to 20kHz response, saving both board space and cost due to the use of smaller capacitors. Charge-Pump Capacitor Selection Use capacitors with an ESR less than 100m for optimum performance. Low-ESR ceramic capacitors minimize the output resistance of the charge pump. For best performance over the extended temperature range, select capacitors with an X7R dielectric. Table 1 lists suggested manufacturers. Flying Capacitor (C1) The value of the flying capacitor (C1) affects the load regulation and output resistance of the charge pump. A C1 value that is too small degrades the device's ability to provide sufficient current drive, which leads to a loss of output voltage. Increasing the value of C1 improves load regulation and reduces the charge-pump output resistance to an extent. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics. Above 2.2F, the on-resistance of the switches and the ESR of C1 and C2 dominate. Table 1. Suggested Capacitor Manufacturers SUPPLIER Taiyo Yuden TDK PHONE 800-348-2496 847-803-6100 FAX 847-925-0899 847-390-4405 WEBSITE www.t-yuden.com www.component.tdk.com Note: Please indicate you are using the MAX4410 when contacting these component suppliers. ______________________________________________________________________________________ 15 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Output Capacitor (C2) The output capacitor value and ESR directly affect the ripple at PVSS. Increasing the value of C2 reduces output ripple. Likewise, decreasing the ESR of C2 reduces both ripple and output resistance. Lower capacitance values can be used in systems with low maximum output power levels. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph in the Typical Operating Characteristics. Power-Supply Bypass Capacitor The power-supply bypass capacitor (C3) lowers the output impedance of the power supply, and reduces the impact of the MAX4410's charge-pump switching transients. Bypass PVDD with C3, the same value as C1, and place it physically close to the PVDD and PGND pins (refer to the MAX4410 EV kit for a suggested layout). Layout and Grounding Proper layout and grounding are essential for optimum performance. Connect PGND and SGND together at a single point on the PC board. Connect all components associated with the charge pump (C2 and C3) to the PGND plane. Connect PVDD and SVDD together at the device. Connect PV SS and SV SS together at the device. Bypassing of both supplies is accomplished by charge-pump capacitors C2 and C3 (see Typical Application Circuit). Place capacitors C2 and C3 as close to the device as possible. Route PGND and all traces that carry switching transients away from SGND and the traces and components in the audio signal path. Refer to the layout example in the MAX4410 EV kit datasheet. When using the MAX4410 in a UCSP package, make sure the traces to OUTR (bump C2) are wide enough to handle the maximum expected current flow. Multiple traces may be necessary. Adding Volume Control The addition of a digital potentiometer provides simple volume control. Figure 5 shows the MAX4410 with the MAX5408 dual log taper digital potentiometer used as an input attenuator. Connect the high terminal of the MAX5408 to the audio input, the low terminal to ground and the wiper to CIN. Setting the wiper to the top position passes the audio signal unattenuated. Setting the wiper to the lowest position fully attenuates the input. UCSP Considerations For general UCSP information and PC layout considerations, refer to the Maxim Application Note: WaferLevel Ultra Chip-Scale Package. RF LEFT AUDIO INPUT 5 H0 CIN W0A 7 6 L0 RIN 10 INL OUTL 8 MAX5408 RIGHT AUDIO 12 H1 INPUT CIN W1A 10 11 L1 RIN 13 INR MAX4410 OUTR 11 RF Figure 5. MAX4410 and MAX5408 Volume Control Circuit 16 ______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Typical Application Circuit 1.8V to 3.6V LEFT CHANNEL AUDIO IN 2 (A3) PVDD 9 (D1) SVDD 1 (B2) SHDNL CIN 1F RIN 10k RF 10k C3 2.2F 12 (B1) SHDNR 10 (C1) INL SVDD 8 (D2) HEADPHONE JACK SVSS OUTL UVLO/ SHUTDOWN CONTROL SGND 3 (A4) C1P C1 2.2F 5 (C4) C1N CHARGE PUMP CLICK-AND-POP SUPPRESSION SVDD SGND MAX4410 OUTR 11 (C2) PVSS 6 (D4) C2 2.2F SVSS PGND 7 (D3) 4 (B4) SGND 14 (A2) CIN 1F RIGHT CHANNEL AUDIO IN RIN 10k INR 13 (A1) SVSS RF 10k ( ) DENOTE BUMPS FOR UCSP. ______________________________________________________________________________________ 17 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Pin Configurations TOP VIEW (BUMP SIDE DOWN) 1 A INR B SHDNR C INL OUTR SHDNL SGND PVDD C1P PVDD C1P PGND 2 3 13 INR 12 SHDNR MAX4410 2 3 4 TOP VIEW SHDNL 1 14 SGND PGND 4 C1N 5 MAX4410 11 OUTR 10 INL 9 8 SVDD OUTL C1N PVSS 6 SVSS 7 D SVDD OUTL SVSS PVSS TSSOP UCSP (B16-2) Chip Information TRANSISTOR COUNT: 4295 PROCESS: BiCMOS 18 ______________________________________________________________________________________ 80mW, DirectDrive Stereo Headphone Driver with Shutdown Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX4410 ______________________________________________________________________________________ 16L,UCSP.EPS 19 80mW, DirectDrive Stereo Headphone Driver with Shutdown MAX4410 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. TSSOP4.40mm.EPS |
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