Maxim MAX9777 Manual

Stereo 3w audio power amplifiers with headphone drive and input mux

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

19-0509; Rev 0; 4/06

Stereo 3W Audio Power Amplifiers with

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 V

(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 I

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.

Notebooks

Portable DVD Players

Tablet PCs

________________________________________________________________ Maxim Integrated Products

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.

Headphone Drive and Input Mux

C-compatible (MAX9777) or

Applications

PC Audio Peripherals

Camcorders

Multimedia Monitor

♦ 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, I

C-Compatible or Parallel

Interface

♦ Tiny 28-Pin Thin QFN (5mm

Package

Ordering Information

CONTROL

PART

INTERFACE

MAX9777ETI+

C Compatible 28 Thi n QFN - E P * T2855-6

MAX9778ETI+

Parallel

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 IN

SE/

BTL

RIGHT IN

CONTROL

C-

COMPATIBLE

Features

5mm

0.8mm)

PIN-

PK G

PACKAGE

C O D E

28 Thi n QFN - E P * T2855-6

MAX9777

Table of Contents

Need help?

Do you have a question about the MAX9777 and is the answer not in the manual?

Questions and answers

Summary of Contents for Maxim MAX9777

Page 1: General Description
PC Audio Peripherals Portable DVD Players Camcorders RIGHT IN Tablet PCs Multimedia Monitor RIGHT IN CONTROL COMPATIBLE MAX9777 ________________________________________________________________ Maxim Integrated Products 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.
Page 2: Electrical Characteristics
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux A A B B S S O O L L U U T T E E M M A A X X I I M M U U M M R R A A T T I I N N G G S S to GND ................+6V Continuous Power Dissipation (T = +70°C)
Page 3 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux ELECTRICAL CHARACTERISTICS (continued) = PV = 5.0V, GND = PGND = 0V, V = 5V, C = 1µF, R = 15kΩ, R = ∞. T to T , unless otherwise SHDN BIAS noted.
Page 4 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux ELECTRICAL CHARACTERISTICS (continued) = PV = 5.0V, GND = PGND = 0V, V SHDN = 5V, C = 1µF, R = 15kΩ, R = ∞. T to T , unless otherwise BIAS noted.
Page 5: Typical Operating Characteristics
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics = PV = 5V, GND = PGND = 0V, V SHDN = 5V, C = 1µF, T = +25°C, unless otherwise noted.) BIAS TOTAL HARMONIC DISTORTION PLUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE vs.
Page 6 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics (continued) = PV = 5V, GND = PGND = 0V, V = 5V, C = 1µF, T = +25°C, unless otherwise noted.) SHDN BIAS TOTAL HARMONIC DISTORTION PLUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE vs.
Page 7 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics (continued) = PV = 5V, GND = PGND = 0V, V SHDN = 5V, C = 1µF, T = +25°C, unless otherwise noted.) BIAS POWER-SUPPLY REJECTION RATIO CROSSTALK vs.
Page 8 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics (continued) = PV = 5V, GND = PGND = 0V, V SHDN = 5V, C = 1µF, T = +25°C, unless otherwise noted.) BIAS TOTAL HARMONIC DISTORTION PLUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE vs.
Page 9 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics (continued) = PV = 5V, GND = PGND = 0V, V SHDN = 5V, C = 1µF, T = +25°C, unless otherwise noted.) BIAS POWER DISSIPATION vs. OUTPUT POWER POWER-SUPPLY REJECTION RATIO POWER DISSIPATION vs.
Page 10 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics (continued) = PV = 5V, GND = PGND = 0V, V SHDN = 5V, C = 1µF, T = +25°C, unless otherwise noted.) BIAS SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs.
Page 11: Pin Description
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Pin Description NAME FUNCTION MAX9777 MAX9778 — Serial Data I/O — Interrupt Output 3, 4 3, 4 Power-Supply Input INL1 Left-Channel Input 1 INL2 Left-Channel Input 2 GAINLA Left-Channel Gain Set A GAINLB Left-Channel Gain Set B 9, 13, 23, 27...
Page 12: Detailed Description
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Detailed Description Input Multiplexer Each amplifier features a 2:1 input multiplexer, allowing The MAX9777/MAX9778 feature 3W BTL speaker input selection between two stereo sources. Both multi- amplifiers, 200mW headphone amplifiers, input multi- plexers are controlled by bit 1 in the control register plexers, headphone sensing, and comprehensive click- (MAX9777) or by the IN1/2 pin (MAX9778).
Page 13 Shutdown Click-and-Pop Suppression The MAX9777/MAX9778 feature a 10µA, low-power The MAX9777/MAX9778 feature Maxim’s comprehen- shutdown mode that reduces quiescent current con- sive click-and-pop suppression. When entering or exit- sumption and extends battery life. The drive amplifiers ing shutdown, the common-mode bias voltage of the...
Page 14: Digital Interface
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Digital Interface devices from high-voltage spikes on the bus lines, and minimize crosstalk and undershoot of the bus signals. The MAX9777 features an I C/SMBus™-compatible 2- wire serial interface consisting of a serial data line Bit Transfer (SDA) and a serial clock line (SCL).
Page 15 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Early STOP Conditions Acknowledge Bit (ACK) The MAX9777 recognizes a STOP condition at any The acknowledge bit (ACK) is the ninth bit attached to any 8-bit data word. The receiving device always gen- point during the transmission except if a STOP condi- tion occurs in the same high pulse as a START condi- erates ACK.
Page 16 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Write Data Format in bit 0 of the SHDN register shuts down the device; a There are three registers that configure the MAX9777: logic-low turns on the device. A logic-high is required in the MUTE register, SHDN register, and control register.
Page 17 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Read Data Format Table 5. MAX9777 Control Register Format In read mode (R/W = 1), the MAX9777 writes the con- REGISTER ADDRESS 0000 0011 tents of the selected register to the bus. The direction of the data flow reverses following the address acknowl- NAME VALUE...
Page 18: Applications Information
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Applications Information Single-Ended Headphone Amplifier The MAX9777/MAX9778 can be configured as single- BTL Speaker Amplifiers ended headphone amplifiers through software or by The MAX9777/MAX9778 feature speaker amplifiers sensing the presence of a headphone plug (HPS). In designed to drive a load differentially, a configuration headphone mode, the inverting output of the BTL referred to as bridge-tied load (BTL).
Page 19 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Component Selection the load impedance form a highpass filter with a -3dB point determined by: Gain-Setting Resistors External feedback components set the gain of the − MAX9777/MAX9778. Resistor R sets the gain of the 2π...
Page 20 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux BIAS Capacitor where the impedance, C begins to decrease, and at BIAS is the output of the internally generated 2.5VDC high frequencies, the C is a short circuit. Here the bias voltage.
Page 21: Typical Application Circuits
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Application Circuits 4.5V TO 5.5V 0.1µF 100µF 3, 4 11, 25 0.047µF BIAS 27.4kΩ 1µF 33.2kΩ GAINLB 220µF 15kΩ 10kΩ GAINLA 15kΩ OUTL+ INL1 0.68µF OUTL- 0.68µF 15kΩ INL2 CODEC MAX9777...
Page 22 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Application Circuits (continued) 4.5V TO 5.5V 100µF 0.1µF 3, 4 11, 25 0.047µF BIAS 27.4kΩ 1µF 33.2kΩ GAINLB 220µF 10kΩ 15kΩ GAINLA 15kΩ OUTL+ INL1 0.68µF OUTL- 0.68µF 15kΩ...
Page 23: Functional Diagrams
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Functional Diagrams 4.5V TO 5.5V µ µ 11, 25 3, 4 GAINLB GAIN Ω 0.047µF GAINLA µ 0.68 15kΩ Ω AUDIO 33.2k INL1 Ω 27.4k Ω Ω INPUT INPUT INL2 Ω...
Page 24 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Functional Diagrams (continued) 4.5V TO 5.5V µ µ 11, 25 3, 4 GAINLB GAIN Ω 0.047µF GAINLA µ 0.68 15kΩ Ω AUDIO 33.2k INL1 Ω 27.4k Ω Ω INPUT INPUT INL2 Ω...
Page 25: Pin Configurations
Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Pin Configurations TOP VIEW TOP VIEW GAINRB GAINRB SHDN SHDN PGND PGND PGND PGND OUTL- OUTL- OUTR+ OUTR+ MAX9777 MAX9778 OUTR- OUTL+ OUTR- OUTL+ PGND PGND PGND PGND GAINLB GAINLB IN1/2 THIN QFN...
Page 26: Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _...
Page 27 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

This manual is also suitable for:

Max9778