The MAX9728A/MAX9728B stereo headphone amplifiers
are designed for display and notebook applications
or portable equipment where board space is at a
premium. These devices use 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 MAX9728A offers
an externally adjustable gain, while the MAX9728B has
an internally preset gain of -1.5V/V. The MAX9728A/
MAX9728B deliver up to 60mW per channel into a 32Ω
load and have low 0.02% THD+N. An 80dB at 1kHz
power-supply rejection ratio (PSRR) allows these
devices to operate from noisy digital supplies without
an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.
The MAX9728A/MAX9728B operate from a single 4.5V
to 5.5V supply, consume only 3.5mA of supply current,
feature short-circuit and thermal-overload protection,
and are specified over the extended -40°C to +85°C
temperature range. The devices are available in tiny 12-pin Thin QFN (3mm x 3mm x 0.8mm) and 14-pin TSSOP packages (5mm x 4.4mm x 1.1mm).
Key Features
Applications/Uses
No Bulky DC-Blocking Capacitors Required
Low-Power Shutdown Mode, < 0.1µA
Adjustable Gain (MAX9728A) or Fixed -1.5V/V Gain (MAX9728B)
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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