MAX9722 5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown

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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, eliminating 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-supply 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 shutdown 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 x 3mm x 0.8mm) and 16-pin TSSOP packages.

Key Features

Applications/Uses

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 x 3mm x 0.8mm) Package

	Cell Phones
	Flat-Panel Monitors
	MP3 Players
	Notebook and Desktop PCs
	PDAs
	Portable Audio Equipment
	Smartphones

Key Specifications: Headphone Amplifiers

Part Number

Headphone Amp. V_CC (min) (V)

Headphone Amp. V_CC (max) (V)

Headphone Amp. I_CC (typ) (mA)

Headph. Amp. P_OUT into 32Ω @1% THD+N (W)

Headphone Amp. Half Pwr. THD+N (%)

SNR, A-weighted (dB)

PSRR (db)

Headphone Amp. External Gain

Headphone Amp. Fixed Gain (min) (|V/V|)

Headphone Amp. Fixed Gain (max) (|V/V|)

Features

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX9722

2.4

5.5

130

0.015

103

Yes

•	Common-Mode Sense

Yes

Automotive - General

THIN QFN/16
TSSOP/16

$0.55 @ 1k

See All Headphone Amplifiers (11)

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.