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MAX9729

Maxim Integrated Products
Part Number MAX9729
Manufacturer Maxim Integrated Products
Description Stereo Headphone Amplifier
Published Sep 28, 2007
Detailed Description www.DataSheet4U.com 19-0857; Rev 0; 7/07 Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux General...
Datasheet PDF File MAX9729 PDF File

MAX9729
MAX9729

Overview
www.
DataSheet4U.
com 19-0857; Rev 0; 7/07 Stereo Headphone Amplifier with BassMax, Volume Control, and Input Mux General Description The MAX9729 stereo DirectDrive™ headphone amplifier features bass boost, volume control, an input mux, and an I2C/SMBus™-compatible serial interface.
This makes the MAX9729 ideal for portable audio applications where space is at a premium and performance is essential.
The MAX9729 operates from a single 1.
8V to 3.
6V, and uses Maxim’s patented† DirectDrive architecture, eliminating the need for large DC-blocking capacitors.
The headphone amplifiers deliver 52mW into a 32Ω load, feature low 0.
03% THD+N, and high 90dB PSRR.
Maxim’s industry-leading click-and-pop suppression circuitry reduces audible transients during power and shutdown cycles.
The BassMax feature boosts the bass response of the amplifier, improving audio reproduction for low-end headphones.
The integrated volume control features 32 discrete volume levels along with a ramping function to ensure smooth transitions during shutdown cycles and input selection.
The MAX9729’s eight programmable maximum gain settings allow for a wide range of input signal levels.
A 3:1 multiplexer/mixer allows the selection and summation of multiple stereo input signal sources.
The MAX9729 also includes a dedicated BEEP input with independent attenuation control.
BassMax, volume control, gain settings, and input selection are controlled using the I2C/SMBus-compatible serial interface.
A lowpower, 5µA shutdown mode is controlled through an external logic input or the serial interface.
The MAX9729 consumes only 4.
8mA of supply current, provides short-circuit and thermal-overload protection, and is specified over the -40°C to +85°C extended temperature range.
The MAX9729 is available in a spacesaving 28-pin thin QFN package (5mm x 5mm x 0.
8mm).
Pin Configuration appears at end of data sheet.
Features ♦ DirectDrive Headphone Amplifier Eliminates Bulky DC-Blocking Capacitors ♦ 3:1 Input Multiplexer wi...


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