PDF MAX9714 Data sheet ( Hoja de datos )

Número de pieza	MAX9714
Descripción	(MAX9713 / MAX9714) Spread-Spectrum Mono/Stereo Class D Amplifiers
Fabricantes	Maxim Integrated Products
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No Preview Available ! 19-3039; Rev 2; 9/04 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers 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 www.DataSheeret4nUd.ceormthe 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 LCD Monitors LCD TVs Desktop PCs LCD Projectors High-End Notebook Audio Hands-Free Car Phone Adaptors 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 Ordering Information PART MAX9713ETJ MAX9714ETJ TEMP RANGE -40oC to +85oC -40oC to +85oC EP = Exposed paddle. PIN-PACKAGE 32 TQFN-EP 32 TQFN-EP* AMP Mono Stereo Block Diagrams 0.47µF IN+ 0.47µF IN- MAX9713 H-BRIDGE OUT+ OUT- 0.47µF INL+ 0.47µF INL- MAX9714 H-BRIDGE OUTL+ OUTL- 0.47µF INR+ 0.47µF INR- H-BRIDGE OUTR+ OUTR- Pin Configurations appear at end of data sheet. ________________________________________________________________ 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. 1 page 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers Typical Operating Characteristics (continued) (136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 VDD = 15V AV = 13dB 10 www.DataSheet4U.com f= RL 1kHz = 8Ω 1 SSM 0.1 FFM 0.01 0.001 0 246 OUTPUT POWER (W) 8 OUTPUT POWER vs. SUPPLY VOLTAGE 8 7 6 5 4 3 2 AV = 13dB 1 THD+N = 10% RL = 8Ω 0 10 13 16 19 SUPPLY VOLTAGE (V) 22 25 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0 VDD = 15V -10 AV = 13dB VRIPPLE = 200mVP-P -20 RL = 16Ω -30 -40 -50 -60 -70 10 100 1k 10k FREQUENCY (Hz) 100k EFFICIENCY vs. OUTPUT POWER 100 RL = 16Ω 90 80 70 60 RL = 8Ω 50 40 30 20 10 0 0 VDD = 15V AV = 13dB 2468 OUTPUT POWER (W) 10 OUTPUT POWER vs. LOAD RESISTANCE 10 9 VDD = 15V AV = 13dB 8 THD+N = 10% 7 6 5 4 3 THD+N = 1% 2 1 0 1 10 100 LOAD RESISTANCE (Ω) CROSSTALK vs. FREQUENCY 0 OUTPUT REFERRED AV = 13dB -20 -40 -60 LEFT TO RIGHT -80 -100 -120 0.01 RIGHT TO LEFT 0.1 1 10 FREQUENCY (Hz) 100 100 90 80 70 60 50 40 30 20 10 0 0 EFFICIENCY vs. OUTPUT POWER RL = 16Ω RL = 8Ω VDD = 20V AV = 13dB 369 OUTPUT POWER (W) 12 COMMON-MODE REJECTION RATIO vs. FREQUENCY 0 VDD = 15V -10 AV = 13dB -20 RL = 8Ω -30 -40 -50 -60 -70 -80 -90 10 100 1k 10k FREQUENCY (Hz) 100k OUTPUT FREQUENCY SPECTRUM 20 FFM MODE 0 POUT = 5W f =1kHz -20 RL = 8Ω UNWEIGHTED -40 -60 -80 -100 -120 -140 0 5 10 15 FREQUENCY (Hz) 20 _______________________________________________________________________________________ 5 5 Page 6W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers resistance of the switches and the ESR of C1 and C2 dominate. Output Capacitor (C2) The output capacitor value and ESR directly affect the ripple at CHOLD. Increasing C2 reduces output ripple. Likewise, decreasing the ESR of C2 reduces both rip- ple and output resistance. Lower capacitance values can be used in systems with low maximum output www.DataSheept4oUw.ceormlevels. Output Filter The MAX9713/MAX9714 do not require an output filter. The device passes FCC emissions standards with 36cm of unshielded speaker cables. However, output filtering can be used if a design is failing radiated emis- sions due to board layout or cable length, or the circuit is near EMI-sensitive devices. Use a ferrite bead filter when radiated frequencies above 10MHz are of con- cern. Use an LC filter when radiated frequencies below 10MHz are of concern, or when long leads connect the amplifier to the speaker. Refer to the MAX9714 Evaluation Kit schematic for details of this filter. Sharing Input Sources In certain systems, a single audio source can be shared by multiple devices (speaker and headphone ampli- fiers). When sharing inputs, it is common to mute the unused device, rather than completely shutting it down, preventing the unused device inputs from distorting the input signal. Mute the MAX9713/MAX9714 by driving SS low through an open-drain output or MOSFET (see the System Diagram). Driving SS low turns off the class D output stage, but does not affect the input bias levels of the MAX9713/MAX9714. Be aware that during normal operation, the voltage at SS can be up to 7V, depending on the MAX9713/MAX9714 supply. 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-sup- ply connection to VDD 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. Refer to the MAX9714 Evaluation Kit for layout guidance. Pin Configurations TOP VIEW PGND 1 PGND 2 VDD 3 VDD 4 C1N 5 C1P 6 CHOLD 7 N.C. 8 MAX9713 24 PGND 23 PGND 22 VDD 21 VDD 20 N.C. 19 FS2 18 FS1 17 N.C. PGND 1 PGND 2 VDD 3 VDD 4 C1N 5 C1P 6 CHOLD 7 N.C. 8 MAX9714 24 PGND 23 PGND 22 VDD 21 VDD 20 FS2 19 FS1 18 G2 17 G1 TQFN (5mm x 5mm) TQFN (7mm x 7mm) Chip Information MAX9713 TRANSISTOR COUNT: 3093 MAX9714 TRANSISTOR COUNT: 4630 PROCESS: BiCMOS ______________________________________________________________________________________ 11 11 Page

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