Maxim MAX9778 manual Stereo 3W Audio Power Amplifiers with, Headphone Drive and Input Mux

µ

19-0509; Rev 0; 4/06

Stereo 3W Audio Power Amplifiers with

Headphone Drive and Input Mux

General Description

The MAX9777/MAX9778 combine a stereo 3W bridge- tied load (BTL) audio power amplifier, stereo single- ended (SE) headphone amplifier, headphone sensing, and a 2:1 input multiplexer all in a tiny 28-pin thin QFN package. These devices operate from a single 4.5V to 5.5V supply and feature an industry-leading 100dB PSRR, allowing these devices to operate from noisy supplies without the addition of a linear regulator. An ultra-low 0.002% THD+N ensures clean, low-distortion amplification of the audio signal. Click-and-pop sup- pression minimizes audible transients on power and shutdown cycles. Power-saving features include low 4mV VOS (minimizes DC current drain through the speakers), low 13mA supply current, and a 10µA shut- down mode. A MUTE function allows the outputs to be quickly enabled or disabled.

A headphone sense input detects the presence of a headphone jack and automatically configures the amplifiers for either speaker or headphone mode. In speaker mode, the amplifiers can deliver up to 3W of continuous average power into a 3Ω load. In head- phone mode, the amplifier can deliver up to 200mW of continuous average power into a 16Ω load. The gain of the amplifiers is externally set, allowing maximum flexi- bility in optimizing output levels for a given load. The amplifiers also feature a 2:1 input multiplexer, allowing multiple audio sources to be selected. The multiplexer can also be used to compensate for limitations in the frequency response of the loud speakers by selecting an external equalizer network. The various functions are controlled by either an I2C-compatible (MAX9777) or simple parallel control interface (MAX9778).

The MAX9777/MAX9778 are available in a thermally efficient 28-pin thin QFN package (5mm x 5mm x 0.8mm). These devices have thermal-overload protec- tion (OVP) and are specified over the extended -40°C to +85°C temperature range.

		Applications
Notebooks	PC Audio Peripherals
Portable DVD Players	Camcorders
Tablet PCs	Multimedia Monitor

Features

♦Industry-Leading, Ultra-High 100dB PSRR

♦3W BTL Stereo Speaker Amplifier

♦200mW Stereo Headphone Amplifier

♦Low 0.002% THD+N

♦Click-and-Pop Suppression

♦ESD-Protected Outputs

♦Low Quiescent Current: 13mA

♦Low-Power Shutdown Mode: 10µA

♦MUTE Function

♦Headphone Sense Input

♦Stereo 2:1 Input Multiplexer

♦Optional 2-Wire, I2C-Compatible or Parallel Interface

♦Tiny 28-Pin Thin QFN (5mm x 5mm x 0.8mm) Package

Ordering Information

PART	CONTROL	PIN-	PKG
	INTERFACE	PACKAGE	CODE
MAX9777ETI+	I2C Compatible	28 Thin QFN-EP*	T2855-6
MAX9778ETI+	Parallel	28 Thin QFN-EP*	T2855-6

Note: All devices are specified over the -40°C to +85°C operat- ing temperature range.

+Denotes lead-free package. *EP = Exposed paddle.

Pin Configurations and Functional Diagrams appear at end of data sheet.

Simplified Block Diagram

	SINGLE SUPPLY
	4.5V TO 5.5V
LEFT IN1
LEFT IN2
	SE/
	BTL
RIGHT IN1
RIGHT IN2
CONTROL	I2C-
	COMPATIBLE
	MAX9777

MAX9777/MAX9778

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.