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MAX4409 Datasheet

  • MAX4409

  • "80mW, DirectDrive, Stereo Headphone Amplifier with Common-M...

  • 650.07KB

  • Maxim   Maxim

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19-2842; Rev 0; 4/03
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
General Description
The MAX4409 stereo headphone amplifier combines
Maxim鈥檚 DirectDrive architecture and a common-mode
sense input, which allows the amplifier to reject com-
mon-mode noise. Conventional headphone amplifiers
require a bulky DC-blocking capacitor between the
headphone and the amplifier. DirectDrive produces a
ground-referenced output from a single supply, elimi-
nating the need for large DC-blocking capacitors,
which saves cost, board space, and component height.
The common-mode voltage sensing corrects for any
difference 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 connec-
tion to other grounded equipment, for example, a PC
connected to a home hi-fi system.
The MAX4409 draws only 5mA of supply current, deliv-
ers up to 80mW per channel into a 16鈩?load, and has a
low 0.002% THD+N. A high 86dB power-supply rejec-
tion ratio allows this device to operate from noisy digital
supplies without additional power-supply conditioning.
The MAX4409 includes 鹵8kV ESD protection on the
headphone outputs. Comprehensive click-and-pop cir-
cuitry eliminates audible clicks and pops on startup
and shutdown. A low-power shutdown mode reduces
supply current draw to only 6碌A(chǔ).
The MAX4409 operates from a single 1.8V to 3.6V sup-
ply, has short-circuit and thermal overload protection,
and is specified over the extended -40擄C to +85擄C tem-
perature 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鈩?/div>
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
鹵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擄C to +85擄C
-40擄C to +85擄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鈥檚 website at www.maxim-ic.com.

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