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MAX9721

Maxim
Part Number MAX9721
Manufacturer Maxim
Description 1V / Fixed-Gain / DirectDrive / Stereo Headphone Amplifier
Published May 2, 2005
Detailed Description 19-3167; Rev 0; 1/04 1V, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown General Description The MAX9...
Datasheet PDF File MAX9721 PDF File

MAX9721
MAX9721

Overview
19-3167; Rev 0; 1/04 1V, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown General Description 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).
Features ♦ 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 ♦ ♦ ♦ ♦ 20mW per Channel into 32Ω Low 0.
006% THD+N High PSRR (80dB at 1kHz) Integrated Click-and-Pop Suppression MAX9721 ♦ Low Quiescent Current (2.
2mA) ♦ Low-Power Shutdown Control ♦ Short-Circuit Protection ♦ ±8kV ESD-Protected Amplifier Outputs ♦ Av...


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