MAX9723：Stereo DirectDrive® Headphone Amplifier with BassMax, Volume Control, and I²C

The MAX9723 stereo DirectDrive headphone amplifier with BassMax and volume control is ideal for portable audio applications where space is at a premium and performance is essential. The MAX9723 operates from a single 1.8V to 3.6V power supply and includes features that reduce external component count, system cost, board space, and improves audio reproduction. The headphone amplifier uses Maxim's DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors. The headphone amplifiers deliver 62mW into a 16Ω load, feature low 0.006% THD+N, and high 90dB PSRR. The MAX9723 features Maxim's industry-leading click-and-pop suppression. The BassMax feature boosts the bass response of the amplifier, improving audio reproduction when using inexpensive headphones. The integrated volume control features 32 discrete volume levels, eliminating the need for an external potentiometer. BassMax and the volume control are enabled through the I²C/SMBus™-compatible interface. Shutdown is controlled through either the hardware or software interfaces. The MAX9723 consumes only 3.7mA of supply current at 1.8V, provides short-circuit and thermal-overload protection, and is fully specified over the extended -40°C to +85°C temperature range. The MAX9723 is available in a tiny (2mm x 2mm x 0.62mm) 16-bump chip-scale package (UCSP™) or 16-pin thin QFN (4mm x 4mm x 0.8mm) package.

Key Features

62mW, DirectDrive Headphone Amplifier Eliminates Bulky DC-Blocking Capacitors
1.8V to 3.6V Single-Supply Operation
Integrated 32-Level Volume Control
High 90dB PSRR at 1kHz
Low 0.006% THD+N
Industry-Leading Click-and-Pop Suppression
±8kV HBM ESD-Protected Headphone Outputs
Short-Circuit and Thermal-Overload Protection
Low-Power Shutdown Mode (5µA)
Software-Enabled Bass Boost (BassMax)
I²C/SMBus-Compatible Interface
Available in Space-Saving, Thermally Efficient Packages:
- 16-Bump UCSP (2mm x 2mm x 0.62mm)
- 16-Pin Thin QFN (4mm x 4mm x 0.8mm)

MAX9723: Block Diagram

Applications/Uses

Mini Disc Players
MP3 Players
MP3-Enabled Cellular Phones
PDA Audio
Portable CD Players

DataSheet

title	Download file
MAX9723 Data Sheet	MAX9723.pdf

Parametrics

Part Number	Hdph. Amp. V_CC (V)	Hdph. Amp. V_CC (V)	Hdph. Amp. I_CC (mA)	Hdph. Amp. P_OUT into 32Ω (mW)	Hdph. Amp. Half Pwr. THD+N (%)	SNR (dB)	PSRR (dB)	Hdph. Amp. Ext. Gain	Hdph. Amp. Fxd. Gain (\|V/V\|)	Hdph. Amp. Fxd. Gain (\|V/V\|)	Package/Pins	Budgetary Price
Part Number	min	max	typ	@ 1% THD+N	Hdph. Amp. Half Pwr. THD+N (%)	A- Weighted	min	Hdph. Amp. Ext. Gain	min	max	Package/Pins	See Notes
MAX9723	1.8	3.6	4	59	0.007	100	90	No	0.5	2	TQFN/16 UCSP/16	$0.60 @1k

Design kits & evaluation modules

Quality and Environmental Data

MAX9723.pdf

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX9723BETE+	Active	TQFN,;16 pin;16.8 mm²	-40°C to +85°C	Lead Free
MAX9723BETE+T	No Longer Available	QFN;	-40°C to +85°C	See data sheet
MAX9723DEBE+	Active	UCSP,;16 pin;4.3 mm²	-40°C to +85°C	Lead Free
MAX9723DEBE+T	Active	UCSP,;16 pin;4.3 mm²	-40°C to +85°C	Lead Free
MAX9723DETE+	Active	TQFN,;16 pin;16.8 mm²	-40°C to +85°C	Lead Free
MAX9723DETE+T	Active	TQFN,;16 pin;16.8 mm²	-40°C to +85°C	Lead Free