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General Description

The MAX9713/MAX9714 mono/stereo class D audio

power amplifiers provide class AB amplifier performance

with class D efficiency, conserving board space and

eliminating the need for a bulky heatsink. Using a class

D architecture, these devices deliver up to 6W while

offering greater than 85% efficiency. Proprietary and

patent-protected modulation and switching schemes

render the traditional class D output filter unnecessary.

The MAX9713/MAX9714 offer two modulation schemes:

a fixed-frequency mode (FFM), and a spread-spectrum

mode (SSM) that reduces EMI-radiated emissions due

to the modulation frequency. The device utilizes a fully

differential architecture, a full bridged output, and com-

prehensive click-and-pop suppression.

The MAX9713/MAX9714 feature high 76dB PSRR, low

0.07% THD+N, and SNR in excess of 100dB. Short-cir-

cuit and thermal-overload protection prevent the

devices from being damaged during a fault condition.

The MAX9713 is available in a 32-pin TQFN (5mm x

5mm x 0.8mm) package. The MAX9714 is available in a

32-pin TQFN (7mm x 7mm x 0.8mm) package. Both

devices are specified over the extended -40°C to

+85°C temperature range.

Applications

Features

♦ Filterless Class D Amplifier

♦ Unique Spread-Spectrum Mode Offers 5dB

Emissions Improvement Over Conventional

Methods

♦ Up to 85% Efficient

♦ 6W Output Power into 8Ω

♦ Low 0.07% THD+N

♦ High PSRR (76dB at 1kHz)

♦ 10V to 25V Single-Supply Operation

♦ Differential Inputs Minimize Common-Mode Noise

♦ Pin-Selectable Gain Reduces Component Count

♦ Industry-Leading Integrated Click-and-Pop

Suppression

♦ Low Quiescent Current (18mA)

♦ Low-Power Shutdown Mode (0.2µA)

♦ Short-Circuit and Thermal-Overload Protection

♦ Available in Thermally Efficient, Space-Saving

Packages:

32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9713

32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9714

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum

Mono/Stereo Class D Amplifiers

________________________________________________________________ Maxim Integrated Products 1

19-3039; Rev 0; 10/03

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.

Ordering Information

PART TEMP RANGE

PIN-PACKAGE

AMP

MAX9713ETJ -40

C to +85

32 TQFN-EP*

Mono

MAX9714ETJ -40

C to +85

32 TQFN-EP*

Stereo

*EP = Exposed paddle.

LCD Monitors

LCD TVs

Desktop PCs

LCD Projectors

High-End Notebook

Audio

Hands-Free Car

Phone Adaptors

MAX9714

0.47µF

INL+ OUTL+

OUTL-INL-

0.47µF

H-BRIDGE

0.47µF

INR+ OUTR+

OUTR-INR-

0.47µF

H-BRIDGE

Pin Configurations appear at end of data sheet.

MAX9713

0.47µF

IN+ OUT+

OUT-

IN-

0.47µF

H-BRIDGE

Block Diagrams

Summary of content (18 pages)

PAGE 1
9-3039; Rev 0; 10/03 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Features ♦ Filterless Class D Amplifier ♦ Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods ♦ Up to 85% Efficient ♦ 6W Output Power into 8Ω ♦ Low 0.
PAGE 2
MAX9713/MAX9714 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VDD to PGND, AGND .............................................................30V OUTR_, OUTL_, C1N..................................-0.3V to (VDD + 0.3V) C1P............................................(VDD - 0.3V) to (CHOLD + 0.3V) CHOLD ........................................................(VDD - 0.3V) to +40V All Other Pins to GND...................................
PAGE 3
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers (VDD = 15V, GND = PGND = 0V, SHDN ≥ VIH, AV = 16dB, CSS = CIN = CREG = 0.47µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 = GND (fS = 330kHz), RL connected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.) VDD = +20V AV = 13dB RL = 8Ω 1 1 POUT = 4W VDD = +15V AV = 13dB RL = 16Ω 1 POUT = 100mW THD+N (%) THD+N (%) POUT = 100mW 10 THD+N (%) VDD = +15V AV = 13dB RL = 8Ω MAX9713 toc02 10 MAX9713 toc01 10 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY MAX9713 toc03 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 5
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers 70 RL = 8Ω 60 50 40 30 FFM 0.01 0.001 4 6 8 4 6 8 0 10 0 3 6 9 12 OUTPUT POWER vs. SUPPLY VOLTAGE OUTPUT POWER vs. LOAD RESISTANCE COMMON-MODE REJECTION RATIO vs. FREQUENCY 3 2 AV = 13dB THD+N = 10% RL = 8Ω -30 6 5 4 3 22 -70 1 -80 -90 1 25 10 POWER-SUPPLY REJECTION RATIO vs.
PAGE 6
Typical Operating Characteristics (continued) (136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.
PAGE 7
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers PIN NAME FUNCTION MAX9713 MAX9714 1, 2, 23, 24 1, 2, 23, 24 PGND 3, 4, 21, 22 3, 4, 21, 22 VDD Power-Supply Input 5 5 C1N Charge-Pump Flying Capacitor Negative Terminal 6 6 C1P Charge-Pump Flying Capacitor Positive Terminal 7 7 CHOLD 8, 17, 20, 25, 26, 31, 32 8 N.C. No Connection. Not internally connected. 9 14 REG Internal Regulator Output. Bypass with a 0.47µF capacitor to PGND.
PAGE 8
MAX9713/MAX9714 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Detailed Description The MAX9713/MAX9714 filterless, class D audio power amplifiers feature several improvements to switchmode amplifier technology. The MAX9713 is a mono amplifier, the MAX9714 is a stereo amplifier. These devices offer class AB performance with class D efficiency, while occupying minimal board space.
PAGE 9
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers the amplifier, and can decrease efficiency. The traditional PWM scheme uses large differential output swings (2 ✕ VDD peak-to-peak) and causes large ripple currents. Any parasitic resistance in the filter components results in a loss of power, lowering the efficiency. The MAX9713/MAX9714 do not require an output filter.
PAGE 10
MAX9713/MAX9714 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Table 2. Gain Settings 0.47µF SINGLE-ENDED AUDIO INPUT IN+ GAIN (dB) INPUT (VRMS) RL (Ω) POUT (W) 13.0 1.79 16 8 MAX9713/ 16.1 1.25 16 8 IN- MAX9714 19.1 0.89 16 8 22.1 1.79 16 8 13.0 1.10 8 6 16.1 0.77 8 6 19.1 0.54 8 6 22.1 0.38 8 6 In the class D case, an 8mV offset into 8Ω equates to an additional power drain of 8µW.
PAGE 11
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Supply Bypassing/Layout Proper power-supply bypassing ensures low distortion operation. For optimum performance, bypass VDD to PGND with a 0.1µF capacitor as close to each VDD pin as possible. A low-impedance, high-current power-supply connection to V DD is assumed. Additional bulk capacitance should be added as required depending on the application and power-supply characteristics. AGND and PGND should be star connected to system ground.
PAGE 12
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers MAX9713/MAX9714 Functional Diagrams 10V TO +25V 100µF 0.1µF 0.1µF 1 2 PGND 0.47µF 0.47µF 3 4 21 22 VDD VDD 23 24 PGND 11 IN+ OUT+ 30 MODULATOR 12 IN- OUT+ 29 OUT- 28 H-BRIDGE OUT- 27 VREG VREG VIH VREG VREG 18 FS1 19 FS2 14 SHDN 15 G1 16 G2 13 SS 9 REG 0.18µF 0.47µF OSCILLATOR GAIN CONTROL MAX9713 C1P 6 SHUTDOWN CONTROL CHARGE PUMP 5 C1 0.1µF C1N 10 AGND CHOLD 7 C2 1µF LOGIC INPUTS SHOWN FOR AV = 16dB (SSM).
PAGE 13
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers 10V TO +25V 100µF 0.1µF 0.1µF 1 2 PGND 0.47µF 0.47µF 3 4 21 22 VDD VDD 23 24 PGND 10 INL+ OUTL+ 32 MODULATOR 9 INL- OUTL+ 31 OUTL- 30 H-BRIDGE OUTL- 29 VREG VREG 0.47µF 0.47µF 19 FS1 20 FS2 OSCILLATOR 15 INR+ OUTR+ 26 MODULATOR 16 INR- OUTR+ 25 OUTR- 28 H-BRIDGE OUTR- 27 VIH VREG VREG 11 SHDN 17 G1 18 G2 12 SS 14 REG 0.18µF 0.47µF GAIN CONTROL MAX9714 C1P 6 SHUTDOWN CONTROL CHARGE PUMP 5 C1 0.
PAGE 14
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers MAX9713/MAX9714 System Diagram VDD 1µF 0.47µF VDD SHDN INL- OUTL- INL+ OUTL+ 0.47µF CODEC MAX9714 0.47µF INR+ OUTR+ INR- OUTR- 0.47µF 5V SS 100kΩ 0.
PAGE 15
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers 32, 44, 48L QFN .EPS D2 D CL D/2 b D2/2 k E/2 E2/2 E CL (NE-1) X e E2 k L DETAIL A e (ND-1) X e CL CL L L e A1 A2 e A PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 32, 44, 48L QFN THIN, 7x7x0.8 mm APPROVAL DOCUMENT CONTROL NO. 21-0144 REV.
PAGE 16
MAX9713/MAX9714 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Package Information (continued) (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.) COMMON DIMENSIONS EXPOSED PAD VARIATIONS ** NOTE: T4877-1 IS A CUSTOM 48L PKG. WITH 4 LEADS DEPOPULATED. TOTAL NUMBER OF LEADS ARE 44. PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 32, 44, 48L QFN THIN, 7x7x0.
PAGE 17
6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers b CL 0.10 M C A B D2/2 D/2 PIN # 1 I.D. QFN THIN.EPS D2 0.15 C A D k 0.15 C B PIN # 1 I.D. 0.35x45∞ E/2 E2/2 CL (NE-1) X e E E2 k L DETAIL A e (ND-1) X e CL CL L L e e 0.10 C A C 0.08 C A1 A3 PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm APPROVAL DOCUMENT CONTROL NO. REV.
PAGE 18
MAX9713/MAX9714 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Package Information (continued) (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.) COMMON DIMENSIONS EXPOSED PAD VARIATIONS NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4.