MAX9728A

60mW, DirectDrive, Stereo Headphone Amplifier with Shutdown

60mW DirectDrive Headphone Amplifiers Ideal for TV and Notebook Applications

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Overview

No Bulky DC-Blocking Capacitors Required
Low-Power Shutdown Mode, < 0.1µA
Adjustable Gain (MAX9728A) or Fixed -1.5V/V Gain (MAX9728B)
Low 0.02% THD+N
High PSRR (80dB at 1kHz) Eliminates LDO
Integrated Click-and-Pop Suppression
4.5V to 5.5V Single-Supply Operation
Low Quiescent Current (3.5mA)
Available in Space-Saving Packages
- 12-Pin Thin QFN (3mm x 3mm x 0.8mm)
- 14-Pin TSSOP (5mm x 4.4mm x 1.1mm)

The MAX9728A/MAX9728B stereo headphone amplifiers are designed for display and notebook applications or portable equipment where board space is at a premium. These devices use a unique 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. The MAX9728A offers an externally adjustable gain, while the MAX9728B has an internally preset gain of -1.5V/V. The MAX9728A/MAX9728B deliver up to 60mW per channel into a 32Ω load and have low 0.02% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.

The MAX9728A/MAX9728B operate from a single 4.5V to 5.5V supply, consume only 3.5mA 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 12-pin Thin QFN (3mm x 3mm x 0.8mm) and 14-pin TSSOP packages (5mm x 4.4mm x 1.1mm).

Applications

CRT TVs
DVD Players
LCD/PDP Displays
Multimedia Monitors
Notebook PCs

Documentation

Data Sheet 1

MAX9728-MAX9728B: 60mW, DirectDrive, Stereo Headphone Amplifier with Shutdown Data Sheet (Rev.1) 12/07/2009

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX9728A and MAX9728B

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Features and Benefits

No Bulky DC-Blocking Capacitors Required
2.7V to 5.5V DC Single-Supply Operation
63mW Per Channel into 32Ω (V_DD = 5V)
Low 0.02% THD+N at 1kHz
High 86dB PSRR Eliminates LDO
2V_RMS Audio Line Driver from a Single 3.3V Supply
Fully Assembled and Tested Surface-Mount Board

Product Details

The MAX9728A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX9728A DirectDrive® stereo headphone amplifier. Maxim's DirectDrive technology eliminates the need for DC-blocking capacitors on the stereo outputs of the amplifier. Designed to operate from a 2.7V to 5.5V DC power supply, the EV kit is capable of delivering up to 42mW per channel into a 16Ω load or 63mW per channel into a 32Ω load at 1% THD+N (V_DD = 5V).

The EV kit can be configured as a line driver to deliver 2V_RMS into a 10kΩ load from a single 3.3V DC supply. The MAX9728A EV kit also evaluates the MAX9728B IC.