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MAX9722B

5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown

Maxim Integrated 

19-3049; Rev 2; 10/07

EVAALVUAAILTAIOBNLEKIT

5V, Differential Input, DirectDrive, 130mW

Stereo Headphone Amplifiers with Shutdown

General Description

The MAX9722A/MAX9722B stereo headphone amplifiers

are designed for portable equipment where board space

is at a premium. The MAX9722A/MAX9722B use a

unique, patented DirectDrive architecture to produce a

ground-referenced output from a single supply, eliminat-

ing the need for large DC-blocking capacitors, which

saves cost, board space, and component height.

Additionally, the gain of the amplifier is set internally

(-2V/V, MAX9722B) or adjusted externally (MAX9722A).

The MAX9722A/MAX9722B deliver up to 70mW per

channel into a 16Ω load or 130mW into a 32Ω load and

have low 0.009% THD+N. An 80dB at 217Hz power-sup-

ply rejection ratio (PSRR) allows these devices to operate

from noisy digital supplies without an additional linear

regulator. The MAX9722A/MAX9722B include ±8kV ESD

protection on the headphone outputs. Comprehensive

anticlick-and-pop circuitry suppresses audible clicks

and pops on startup and shutdown. A low-power shut-

down mode reduces the supply current to 0.1µA.

The MAX9722A/MAX9722B operate from a single 2.4V

to 5.5V supply, consume only 5.5mA 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

16-pin thin QFN (3mm ✕ 3mm ✕ 0.8mm) and 16-pin

TSSOP packages.

Applications

Notebook and

Desktop PCs

MP3 Players

Flat-Panel Monitors

Cellular Phones

Smart Phones

PDAs

Portable Audio

Equipment

Ordering Information

PART

PIN-PACKAGE

TOP PKG

MARK CODE

MAX9722AETE

16 Thin QFN-EP* (3mm

✕ 3mm ✕ 0.8mm)

AAX T1633-5

MAX9722AEUE 16 TSSOP

— U16-1

MAX9722BETE

16 Thin QFN-EP* (3mm

✕ 3mm ✕ 0.8mm)

AAY T1633-5

MAX9722BEUE 16 TSSOP

— U16-1

Note: All devices are specified over the -40°C to +85°C operating

temperature range.

*EP = Exposed paddle.

Features

♦ 2.4V to 5.5V Single-Supply Operation

♦ High PSRR (80dB at 217Hz) Eliminates LDO

♦ No Bulky DC-Blocking Capacitors Required

♦ Ground-Referenced Outputs Eliminate DC Bias

Voltage on Headphone Ground Pin

♦ No Degradation of Low-Frequency Response Due

to Output Capacitors

♦ Differential Inputs for Enhanced Noise

Cancellation

♦ Adjustable Gain (MAX9722A) or Fixed -2V/V Gain

(MAX9722B)

♦ 130mW per Channel into 32Ω

♦ Low 0.009% THD+N

♦ Integrated Click-and-Pop Suppression

♦ Low Quiescent Current (5.5mA)

♦ Short-Circuit and Thermal-Overload Protection

♦ ±8kV ESD-Protected Amplifier Outputs (Human

Body Model)

♦ Available in a Space-Saving 16-Pin Thin QFN

(3mm ✕ 3mm ✕ 0.8mm) Package

Simplified Diagram

LEFT

AUDIO

INPUT

DirectDrive OUTPUTS

ELIMINATE DC-BLOCKING

CAPACITORS.

SHDN

MAX9722B

RIGHT

AUDIO

INPUT

FIXED GAIN ELIMINATES

EXTERNAL RESISTOR

NETWORK.

Pin Configurations and Typical Operating Circuit appear at

end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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