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Part: MAX4409
Category:
Multimedia
-> Audio/Video
Description: MAX4409 80mW, Directdrive, Stereo Headphone Amplifier With Common-mode Sense
Company: Maxim Integrated Products
Datasheet: Download MAX4409 datasheet File size : 539 kB
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Datasheet text preview:
19-2842; Rev 0; 4/03
80mW, DirectDrive, Stereo Headphone Amplifier with Common-Mode Sense
General Description
The MAX4409 stereo headphone amplifier combines Maxim's DirectDrive architecture and a common-mode sense input, which allows the amplifier to reject common-mode noise. Conventional headphone amplifiers r e q u i r e a bulky DC-blocking capacitor between the headphone and the amplifier. DirectDrive produces a ground-referenced output from a single supply, elimin a t i n g the need for large DC-blocking capacitors, which saves cost, board space, and component height. The common-mode voltage sensing corrects for any d i f f e r e n c e between SGND of the amplifier and the headphone return. This feature minimizes ground-loop noise when the HP socket is used as a line out connection to other grounded equipment, for example, a PC connected to a home hi-fi system. The MAX4409 draws only 5mA of supply current, delivers up to 80mW per channel into a 16 load, and has a low 0.002% THD+N. A high 86dB power-supply rejection ratio allows this device to operate from noisy digital supplies without additional power-supply conditioning. The MAX4409 includes ±8kV ESD protection on the headphone outputs. Comprehensive click-and-pop circuitry eliminates audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces supply current draw to only 6µA. The MAX4409 operates from a single 1.8V to 3.6V supply, has short-circuit and thermal overload protection, and is specified over the extended -40°C to +85°C temperature range. The MAX4409 is available in tiny 20-pin thin QFN and 14-pin TSSOP packages.
Features
o No Bulky DC-Blocking Capacitors Required o Ground-Referenced Outputs Eliminate DC-Bias Voltages on Headphone Ground Pin o Common-Mode Voltage Sensing Eliminates Ground-Loop Noise o 96dB CMRR o No Degradation of Low-Frequency Response Due to Output Capacitors o 80mW per Channel into 16 o Low 0.002% THD+N o High 86dB PSRR o Integrated Click-and-Pop Suppression o 1.8V to 3.6V Single-Supply Operation o Low Quiescent Current o Low-Power Shutdown Mode o Short-Circuit and Thermal-Overload Protection o ±8kV ESD-Protected Amplifier Outputs o Available in Space-Saving Packages 14-Pin TSSOP 20-Pin Thin QFN
MAX4409
Ordering Information
PART MAX4409ETP MAX4409EUD TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 Thin QFN-EP* 14 TSSOP
*EP = Exposed paddle.
Applications
Notebooks Desktop PCs Cellular Phones PDAs MP3 Players Tablet PCs Portable Audio Equipment
SHDN LEFT AUDIO INPUT
Functional Diagram
MAX4409
DirectDrive OUTPUTS ELIMINATE DC-BLOCKING CAPACITORS
COM
RIGHT AUDIO INPUT
COMMON-MODE SENSE INPUT ELIMINATES GROUND-LOOP NOISE
Pin Configurations and Typical Application Circuit appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
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 Amplifier with Common-Mode Sense MAX4409
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_ and COM to SGND.........SVSS to (SVDD - 1V) IN_ to COM ....(COM + 2V) to (COM - 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 = +70°C) 14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW 20-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349mW Junction Temperature ......+150°C Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
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 = 0V, SHDN = SVDD, C1 = C2 = 2.2µF, RIN = RF = R1 = R2 = 10k, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER Supply Voltage Range Quiescent Supply Current Shutdown Supply Current SYMBOL VDD IDD I SHDN SHDN = GND VIH SHDN Thresholds VIL SHDN Input Leakage Current SHDN to Full Operation CHARGE PUMP Oscillator Frequency AMPLIFIERS Input Offset Voltage Input Bias Current COM Bias Current Equivalent Input Offset Current COM Input Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio VOS IB I A S I COM IOS V COM CMRR PSRR IOS = (IBIAS(INR) + IBIAS(INL) - ICOM) / 2 Inferred from CMRR test -500mV VCOM +500mV, RSOURCE 10 1.8V VDD 3.6V VDD = 3.0V, 200mVP-P ripple THD+N = 1%, TA = +25°C DC (Note 2) fRIPPLE = 1kHz fRIPPLE = 20kHz RL = 32 RL = 16 55 -500 75 75 96 86 76 48 65 80 mW dB RL = 32 -700 -1400 0.5 -100 -200 ±2 +500 2.4 0 0 mV nA nA nA mV dB fOSC 272 320 368 kHz tSON -1 175 0.7 x SVDD 0.3 x SVDD +1 µA µs CONDITIONS Guaranteed by PSRR test MIN 1.8 5 6 TYP MAX 3.6 8.4 10 UNITS V mA µA
V
Output Power
P OUT
2
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80mW, DirectDrive, Stereo Headphone Amplifier with Common-Mode Sense
ELECTRICAL CHARACTERISTICS (continued)
(PVDD = SVDD = 3V, PGND = SGND = 0V, SHDN = SVDD, C1 = C2 = 2.2µF, RIN = RF = R1 = R2 = 10k, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
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 = 50mW RL = 16, POUT = 60mW MIN TYP 0.002 % 0.005 95 0.8 No sustained oscillations RL = 16, POUT = 1.6mW, fIN = 10kHz 150 55 140 15 ±8 dB V/µs pF dB °C °C kV MAX UNITS
MAX4409
THD+N
fIN = 1kHz
SNR SR CL
RL = 32, POUT = 20mW, fIN = 1kHz
Note 1: All specifications are 100% tested at TA = +25°C; temperature limits are guaranteed by design. Note 2: Inputs are connected to ground and COM. Note 3: Inputs are AC-coupled to ground. COM is connected to ground.
Typical Operating Characteristics
(C1 = C2 = 2.2µF, RIN = RF = R1 = R2 = 10k, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4409 toc01
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VDD = 3V RL = 32
MAX4409 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VDD = 1.8V RL = 16
MAX4409 toc03
1 VDD = 3V RL = 16
1
1
0.1 THD+N (%) POUT = 60mW POUT = 10mW THD+N (%)
0.1 THD+N (%)
0.1 POUT = 15mW POUT = 5mW
0.01
0.01
POUT = 50mW POUT = 10mW
0.01
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
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