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 low-power,
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).
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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