MAXIM MAX9830 handbook
Contents
1. MAX9830 OUT IN SHDN N C TDFN 2mm x 2mm x 0 8mm EP EXPOSED PAD CONNECT THE EP TO PGND TO ENHANCE THERMAL DISSIPATION MAXIM Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com 0 86XVYW MAX9830 Mono 2W Class D Amplifier ABSOLUTE MAXIMUM RATINGS Voltage Continuous Power Dissipation for a Multilayer Board PVDD IN IN SHDN to PGND 0 3V to 6V TA 70 C OUT OUT to PGND 0 3V to VPvpD 0 3V 8 Pin TDFN EP derate 11 9MW C 953 5mW Current Junction Temperature Continuous Current Into Out of PVDD PGND Operating Temperature Range NOT Fe OUTS idoli alal lai ile 600mA Storage Temperature Range Continuous Input Current all other pins 20mA Lead Temperature soldering 10s Duration of Short Circuit Between Soldering Temperature reflow OUT OUT and PVDD PGND Continuous Rate of Voltage Rise at PVDD Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational secti2. E E 2 2 0 1 0 1 0 1 Pour 1 4W Pour 600mW Pour 1W 0 01 0 01 0 01 10 100 k Ok 00k 10 00 1k 10k Ok 10 00 1k 10k 100k FREQUENCY Hz FREQUENCY Hz FREQUENCY Hz TOTAL HARMONIC DISTORTION TOTAL HARMONIC DISTORTION TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY PLUS NOISE vs OUTPUT POWER PLUS NOISE vs OUTPUT POWER 10 z 10 2 10 7 7 E VPvDD 3 6V E VpvDD 5 0V g VpvDD 3 6V gt Doan 8Q 8 RLOAD 4Q E RLOAD 4 E 1 1 1 g Pour 100mW E f 1kHz 3 f 1kHz 6kHz f 6kHz X E 0 1 0 1 0 1 Pout 500mW f 100Hz f 100Hz 0 01 0 01 0 01 10 100 k Ok 00k 0 0 5 1 0 15 2 0 2 5 3 0 0 02 04 06 08 10 12 14 FREQUENCY Hz OUTPUT POWER W OUTPUT POWER W TOTAL HARMONIC DISTORTION TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER PLUS NOISE vs OUTPUT POWER OUTPUT POWER vs LOAD RESISTANCE 10 T 7 T 5 10 T T T 8 8 Veypp 5 0V S Vpvpp 3 6V g VpvDD 5 0V E RLOAD 8Q H RLOAD DO E E 1 1 3 amp A 6kHz f 6kHz Si 5 f 1kH f 1kH 04 S 01 E f 100Hz f 100Hz 0 01 0 01 0 02 04 06 08 10 12 14 16 18 0 01 02 03 04 05 06 07 08 0 9 1 10 100 OUTPUT POWER W OUTPUT POWER W LOAD RESISTANCE Q 4 MAKII Typical Operating Characteristics continued VPvDD VSHDN 5 0V VPGND OV RL ee unless otherwise specified RL connected between OUT and OUT AC measure Mono 2W Class D Amplifier ment bandwidth 20Hz to 22kHz Ta 25 C unless otherwise noted OUTPUT POWER vs LOAD RESIST
3. Mono 2W Class D Amplifier PIN oninverting Audio Input Pin Description FUNCTION nverting Audio Input o Connection Leave unconnected Active Low Shutdown Input Drive SHDN low to place the device in shutdown mode Ground egative Speaker Output 1 2 3 4 5 6 7 Positive Speaker Output co Power Supply Bypass PVDD to PGND with a 0 1uF capacitor Detailed Description The MAX9830 features industry leading quiescent cur rent low power shutdown mode comprehensive click and pop suppression and excellent RF immunity The MAX9830 offers Class AB audio performance with Class D efficiency in a minimal board space solution The Class D amplifier features spread spectrum modu lation combined with edge rate and overshoot control circuitry that offers significant improvements to switch mode amplifier radiated emissions The MAX9830 includes thermal overload and short cir cuit protection Class D Speaker Amplifier The MAX9830 filterless Class D amplifier offers much higher efficiency than Class AB amplifiers The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors Any power loss associated with the Class D output stage is mostly due to the I2R loss of the MOSFET on resistance and quiescent current overhead Ultra Low EMI Filterless Output Stage Traditional Class D amplifiers require the use of exter nal LC filters or shielding
4. Supply Input PVDD PVDD powers the speaker amplifier PVDD ranges from 2 6V to 5 5V Bypass PVDD with a 0 1uF capacitor to PGND Apply additional bulk capacitance at the device if long input traces between PVDD and the power source are used Ensure a rate of voltage rise at PVDD is limited to 1V us MAXIM OUT MAX9830 OUT Figure 2 Optional Ferrite Bead Filter Input Filtering The input coupling capacitor CIN in conjunction with the amplifier s internal input resistance RIN forms a highpass filter that removes the DC bias from the incoming signal These capacitors allow the amplifier to bias the signal to an optimum DC level Select 0 47uF capacitors for optimum click and pop performance and 17Hz f 3dB If a different f 3aB is required CIN assuming zero source impedance is 8 Cin e HA 3dB Use capacitors with adequately low voltage coefficient for best low frequency THD performance Layout and Grounding Proper layout and grounding are essential for optimum performance Good grounding improves audio perfor mance and prevents switching noise from coupling into the audio signal Use wide low resistance output traces As load imped ance decreases the current drawn from the device out puts increase At higher current the resistance of the output traces decrease the power delivered to the load For example if 2W is delivered from the speaker output to a 4Q load through a 100mQ trace 49mW is con sume
5. to meet EN55022B electro magnetic interference EMI regulation standards Maxim s active emissions limiting edge rate control cir cuitry and spread spectrum modulation reduces EMI emissions while maintaining up to 85 efficiency Maxim s spread spectrum modulation mode flattens wideband spectral components while proprietary tech niques ensure that the cycle to cycle variation of the switching period does not degrade audio reproduction or efficiency The MAX9830 s spread spectrum modulator randomly varies the switching frequency by 10kHz around the center frequency AVLAZCLA Exposed Pad Connect exposed pad to a solid ground plane EN55022B LIMIT AMPLITUDE dBuV m 60 80 100 120 140 160 180 200 220 240 260 280 300 FREQUENCY MHz Figure 1 EMI with 24in of Speaker Cable 600kHz Above 10MHz the wideband spectrum looks like noise for EMI purposes Figure 1 Speaker Current Limit If the output current of the speaker amplifier exceeds the current limit 1 8A typ the MAX9830 disables the outputs for approximately 400us At the end of 400us the outputs are re enabled If the fault condition still exists the MAX9830 continues to disable and re enable the outputs until the fault condition is removed Shutdown The MAX9830 features a low power shutdown mode drawing O 5pA of supply current Drive SHDN low to put the MAX9830 into shutdown Click and Pop Suppression The MAX9830 speaker amplifier featur
6. ANCE OUTPUT POWER vs SUPPLY VOLTAGE OUTPUT POWER vs SUPPLY VOLTAGE MAX9830 toci Ob 0 86XVM 55 MAX9830 toc13 00k Vpvpp 3 6V E 6 amp 5 5 5 10 THD4 E z e E KR 5 5 ex 1 THD N 1 10 100 25 30 35 40 45 50 55 25 30 35 40 45 50 LOAD RESISTANCE 9 SUPPLY VOLTAGE V SUPPLY VOLTAGE V POWER SUPPLY REJECTION RATIO EFFICIENCY vs OUTPUT POWER EFFICIENCY vs OUTPUT POWER vs FREQUENCY 100 100 2 0 Vevop 5 0V Rloap 80 je Vpvop 3 6V Don 8Q 40 L VrippLe 200mVp p 80 80 R 20 d 30 gt 9 Doan 4Q gt 9 g 0 2 RLOAD 40 ce 50 a o o P t 40 40 2 60 Lu LU 70 20 20 80 90 0 0 100 0 02 04 06 08 10 12 14 16 18 20 0 01 02 03 04 05 06 07 08 09 10 10 100 k OUTPUT POWER W OUTPUT POWER W FREQUENCY Hz COMMON MODE REJECTION RATIO vs FREQUENCY AMPLITUDE vs FREQUENCY STARTUP WAVEFORM z 14 MAX9830 toc16 EFERRED E
7. BER DATE DESCRIPTION CHANGED 8 09 Initial release Removed PSRR spec from the Features section updated EC table specs and 4 10 added new TOCs 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 12 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products Inc
8. E i 12 _ 10 co E 2 S m 8 8 z 6 lt 4 2 0 10 100 1k 10k 100k 10 100 1 10k 100k 400us div FREQUENCY Hz FREQUENCY Hz AVLAZCLAVI SHDN 2V div OUTPUT 500mA div Mono 2W Class D Amplifier Typical Operating Characteristics continued VPvDD VSHDN 5 0V VPGND OV RL ee unless otherwise specified RL connected between OUT and OUT AC measure ment bandwidth 20Hz to 22kHz Ta 25 C unless otherwise noted SHUTDOWN WAVEFORM WIDEBAND OUTPUT SPECTRUM MAX9830 toc17 0 MAX9830 RBW 100Hz 8 SHON 20 B 2V div Es ui Ap e E en Es Lr OUTPUT 9 500mA div e 100 120 400us div 1 10 100 000 FREQUENCY MHz SUPPLY CURRENT OUTPUT FREQUENCY SPECTRUM vs SUPPLY VOLTAGE 2 2 0 g A 16 40 E E Eh a 1 2 gt cc 2 gt 5 a 0 8 5 100 a 0 4 120 14 0 0 2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 FREQUENCY kHz SUPPLY VOLTAGE V SHUTDOWN CURRENT vs SUPPLY VOLTAGE RF IMMUNITY vs FREQUENCY 0 6 0 e 05 E 10 S 20 g 04 E 30 a m E z 0 3 0 R 50 5 02 e 5 60 HA 0 1 70 0 80 25 30 35 40 45 50 55 0 500 1000 1500 2000 2500 3000 SUPPLY VOLTAGE V FREQUENCY MHz 6 MAXI
9. d in the trace If power is delivered through a 10mQ trace only 5mW is consumed in the trace Wide output supply and ground traces also improve the power dissipation of the device The MAX9830 is inherently designed for excellent RF immunity For best performance add ground fills around all signal traces on top and bottom PCB planes The MAX9830 TDFN package features an exposed thermal pad on its underside This pad lowers the pack age s thermal resistance by providing a heat conduc tion path from the die to the PCB Connect the exposed thermal pad to the ground plane by using a large pad and multiple vias Chip Information PROCESS CMOS MAKII Mono 2W Class D Amplifier Functional Diagram 2 6V TO 5 5V FERRITE gt CLASS D MODULATOR MAXIM MAX9830 BULK CAPACITOR AVLAZCLA 9 0 86XVYW MAX9830 Mono 2W Class D Amplifier Package Information For the latest package outline information and land patterns go to www maxim ic com packages Note that a or in the package code indicates RoHS status only Package drawings may show a different suffix character but the drawing pertains to the package regardless of RoHS status PACKAGE TYPE PACKAGE CODE DOCUMENT NO 8 TDFN EP T822 2 21 0168 10 AREA TOP_VIEW SIDE VIEW 0 10 2X PPEP T STE dd SIDE View DRAWING NOT TO SCALE 8L TDFN EXPOSED PADS EPS B 1 N 2 1 xe a BOTTOM VIEW DALLAS A
10. es Maxim s com prehensive click and pop suppression During startup the click and pop suppression circuitry reduces any audible transient sources internal to the device When entering shutdown the differential speaker outputs ramp down to PGND quickly and simultaneously 0 86XVM MAX9830 Mono 2W Class D Amplifier Applications Information Filterless Class D Operation Traditional Class D amplifiers require an output filter The filter adds cost size and decreases efficiency and THD N performance The MAX9830 s filterless modula tion scheme does not require an output filter Because the switching frequency of the MAX9830 is well beyond the bandwidth of most speakers voice coil movement at the switching frequency is very small Use a speaker with a series inductance gt 10uH Typical 8Q speakers exhibit series inductances in the 20uH to 100uH range Component Selection Optional Ferrite Bead Filter Although not normally needed in applications where speaker leads exceed 24in at VPVDD 3V use a filter constructed from an inexpensive ferrite bead and a small value capacitor to ground Figure 2 to provide additional EMI suppression Use a ferrite bead with low DC resistance high frequency 2 1MHz impedance of 100Q to 600 and rated for at least 1A The capacitor value varies based on the ferrite bead chosen and the actual speaker lead length Select the capacitor value based on EMI performance Speaker Amplifier Power
11. fd ON KIT MA d sl IVI SW e Mono 2W Class D Amplifier General Description Features The MAX9830 mono 2W Class D amplifier provides Industry Leading Quiescent Current 1 6mA at 5V Class AB audio performance with Class D efficiency 1 2mA at 3 6V Active emissions limiting edge rate and overshoot con trol circuitry greatly reduces EMI A filterless spread spectrum modulation scheme eliminates the need for Passes EMI Limit Unfiltered with Up to 24in output filtering found in traditional Class D devices 61cm of Speaker Cable These features reduce application component count Spread Spectrum and Active Emissions Limiting Click and Pop Suppression The MAX9830 s industry leading 1 6mA at 5V 1 2mA at 3 6V quiescent current extends battery life in portable Thermal and Overcurrent Protection applications Low 0 5HA Current Shutdown Mode The MAX9830 is available in an 8 pin TDFN 2mm x Space Saving 2mm x 2mm x 0 8mm 8 Pin TDFN 2mm x 0 8mm and is specified over the extended Package 40 C to 85 C temperature range Applications Notebook and Netbook Computers __ ________Ordering Information Cellular Phones PART TEMP RANGE PIN PACKAGE MP3 Players MAX9830AETA 40 C to 85 C 8 TDFN EP Portable Audio Players Denotes a lead Pb free RoHS compliant package VoIP Phones EP Exposed pad Pin Configuration Typical Operating Circuit TOP VIEW PVDD OUT OUT PGND 2 6V TO 5 5V PVDD MAXIM MAX9830 MAXIM
12. l AS Lat 8L TDFN EXPOSED PAD 2x2x0 80mm DOCUMENT CONTROL NO REV 1 AVLAZCLA Mono 2W Class D Amplifier Package Information continued For the latest package outline information and land patterns go to www maxim ic com packages Note that a or in the package code indicates RoHS status only Package drawings may show a different suffix character but the drawing pertains to the package regardless of RoHS status 0 80 D 190 210 2 10 Ca 000 005 0 40 0 25 MIN 0 20 REF PACKAGE VARIATIONS coe w _ T Tees Frazer f e eros 130010 sso re 0208 oras Lane sza s osos 1205010 osorve ozsoos 0125 sos NOTES L ALL DIMENSIONS ARE IN mm ANGLES IN DEGREES 2 COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS COPLANARITY SHALL NOT EXCEED 0 08mm 3 WARPAGE SHALL NOT EXCEED 0 08mm 4 PACKAGE LENGTH PACKAGE WIDTH ARE CONSIDERED AS SPECIAL CHARACTERISTICCS 5 COMPLY TO JEDEC M0229 EXCEPT De AND E2 DIMENSIONS 6 Nr IS THE TOTAL NUMBER DF LEADS 7 NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY DALLAS AVI d la 9 ALL DIMENSIONS APPLY TO BOTH LEADED AND PbFREE PARTS 8L TDFN EXPOSED PAD 2x2x0 80mm DOCUMENT CONTROL NO Rev 2 DRAWING NOT TO SCALE Me 21 0168 E A AVLAZCLA 11 0 86XVM MAX9830 Mono 2W Class D Amplifier Revision History REVISION REVISION PAGES NUM
13. less otherwise specified RL connected between OUT and OUT AC measurement bandwidth 20Hz to 22kHz TA TMIN to Tmax unless otherwise noted Typical values are at TA 25 C Notes 1 2 PARAMETER SYMBOL CONDITIONS Oscillator Frequency fosc Spread Spectrum Bandwidth Noise A weighted Note 3 Pour Pour at 1 THD N A weighted RL 8Q Output Current Limit TA 25 C Thermal Shutdown Level Thermal Shutdown Hysterysis Efficiency RL 8Q PouT 1 5W DIGITAL INPUT SHDN nput Voltage High nput Voltage Low nput Leakage Curren TA 25 C Signal to Noise Ratio Note 1 All devices are 100 production tested at Ta 25 C All temperature limits are guaranteed by design Note 2 Testing performed with a resistive load in series with an inductor to simulate an actual speaker load For RL 4Q L 33uH For RL 8Q L 68uH Note 3 Amplifier inputs AC coupled to PGND with Cin 0 47uF Note 4 Specified at room temperature with an 8Q resistive load in series with a 68uH inductive load connected across BTL outputs Mode transitions are controlled by SHDN AVLAZCLA 3 0 86XVM MAX9830 Mono 2W Class D Amplifier ment bandwidth 20Hz to 22kHz TA 25 C TOTAL HARMONIC DISTORTION TOTAL HARMONIC DISTORTION Typical Operating Characteristics VPvDD VSHDN 5 0V VPGND OV RL ee unless otherwise specified RL connected be
14. ons of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS VPvpD VSHDN 5V VPGND OV RL ee unless otherwise specified RL connected between OUT and OUT AC measurement bandwidth 20Hz to 22kHz TA TMIN to Tmax unless otherwise noted Typical values are at TA 25 C Notes 1 2 PARAMETER SYMBOL CONDITIONS SPEAKER AMPLIFIER Voltage Range PVDD Inferred from PSRR test VPVDD 5 0V VPVDD 3 6V Shutdown Supply Current VSHDN OV TA 25 C Turn On Time Bias Voltage Quiescent Supply Current Single ended aximum AC Input Voltage Differential Between inputs From inputs to PGND put Resistance in Shutdown put Resistance Voltage Gain Common Mode Rejection Ratio fin 1kHz input referred VPVDD 2 6V to 5 5V TA 25 C Power Supply Rejection Ratio PVDDRIPPLE fRIPPLE 217Hz 200mVp p Note 3 fRIPPLE 20kHz THD N 10 RL 8Q fin 1kHz RL 4Q Output Power nm RL 80 PouT Total Harmonic Distortion Plus 0 5W Noise RL 4Q PoUT 1W Output Offset Voltage TA 25 C Peak voltage A weighted 32 samples sec Notes 3 4 Out of shutdown Into shutdown Click and Pop Level 2 AVLAXL VI Mono 2W Class D Amplifier ELECTRICAL CHARACTERISTICS continued VPvpD VSHDN 5V VPGND OV RL un
15. tween OUT and OUT AC measure unless otherwise noted TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY PLUS NOISE vs FREQUENCY PLUS NOISE vs FREQUENCY 10 I 5 10 SET E 10 4 g VPvDD 5 0V 3 VpvDD 3 6V g VpvDD 5 0V g Doan 40 si RLOAD 40 E RLOAD 8Q 1 1 ES Pour 400mW x Pour 100m z Pour 100mW E o
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MAXIM MAX9830 handbook