The MAX9721 fixed-gain, stereo headphone amplifier
is ideal for portable equipment where board space is at a premium. The MAX9721 uses 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. Fixed gains of -2V/V (MAX9721A),
-1.5V/V (MAX9721B), and -1V/V (MAX9721C) further reduce external component count.
The MAX9721 delivers up to 20mW per channel into a 32Ω load and achieves 0.006% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows the MAX9721 to operate from noisy digital supplies without an additional linear regulator. The MAX9721 includes ±8kV ESD protection on the headphone output. Comprehensive click-and-pop circuitry suppresses audible clicks and pops at startup and shutdown. A low-power shutdown mode reduces supply current to 1.0µA (typ).
The MAX9721 operates from a single 0.9V to 1.8V supply allowing the device to be powered directly from a single AA or AAA battery. The MAX9721 consumes only 2.2mA of supply current, provides short-circuit protection, and is specified over the extended -40°C to +85°C temperature range. The MAX9721 is available in a tiny (1.54mm x 2.02mm x 0.6mm), 12-bump chip-scale package (UCSP™) and a 12-pin thin QFN package (4mm x 4mm x 0.8mm).
Key Features
Applications/Uses
Single Cell, 0.9V to 1.8V Single-Supply Operation
Fixed Gain Eliminates External Feedback Network
MAX9721A: -2V/V
MAX9721B: -1.5V/V
MAX9721C: -1V/V
Ground-Referenced Outputs Eliminate DC Bias
No Degradation of Low-Frequency Response Due to Output Capacitors
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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