PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Key Features General Description n 3W Output at 10% THD with a 4 Ω Load and 5V Power Supply n Filterless, Low Quiescent Current and Low EMI n Low THD+N n Power Limit Function to Protect Speaker when Occuring large Input,±5% Power limit Accuracy n 64-step DC Volume Control from -45dB to 24dB n Headphone Output Function n 12dB Effective Noise Reduction n Superior Low Noise: 30uV n Minimize Pop/Clip Noise n High Efficiency up to 90% n Auto Recovery Short Circuit Protection n Thermal Shutdown n Pb-Free Package The PAM8010 is a 3W, class-D audio amplifier with headphone amplifier. Advanced 64- step DC volume control minimizes external components and allows speaker volume control and headphone volume control. Integrated power limit technology which suppress the output signal clip automatically due to the over level input signal. It offers low THD+N, to produce high-quality sound reproduction. PAM8010 has an additional noise reduction circuit which achieve12dB nosie attenuation . This circuit may help eliminate external filtering, thereby saving the board space and components cost. T h e PA M 8 0 1 0 f e a t u r e s S C P ( s h o r t c i r c u i t protection), OTP and thermal shutdown. The PAM8010 is available in SSOP-24 and SOP24 package. Applications n n n n LCD Monitors / TV Projectors Notebook/All-in-one Computers P ortable Speakers Portable DVD Players, Game Machines Typical Application VDD PVDDL 1 uF A VDD 0 . 47 uF PVDDR 1uF PVDD L 1 uF P VDDR I NL INL +O UT_L 0 . 47 uF E arInL -OU T_L 0. 47 uF I NR INR +O UT_R 0. 47 uF E arInR ON -OUT _R SHDN S HDN PAM8010 M UT E 2 2 0u F EarO utL M UTE_D D C Vol ume 1 2 3 ON 2 2 0u F V OL He adpho ne EarO utR 3.3 V/5V V REF 1 uF R1 H: Op era tion L: MU TE (defa ult) MUTE _AB PL R2 1 uF V 2P5 V TH RTH PGNDL PGN DR AGN D Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 1 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Block Diagram AVDD PVDDL PGNDL Headphone EarInR EarOutR VDD/2 + - INR + - +OUT_R DRIVER -OUT_R MODULATOR Thermal Protection MUTE_D GND INTERNAL OSCILLATOR VTH VREF VOL PL MUTE_AB AVDD BIAS AND REFERENCES SHDN V2P5 OSC Current Protection GND +OUT_L MODULATOR - INL VDD/2 + DRIVER -OUT_L + Headphone EarInL EarOutL AGND PVDDR PGNDR Pin Configuration & Marking Information SSOP24/SOP24 Top View -OUT_L -OUT_R 23 PGNDR 22 +OUT_R 21 PVDDR 20 MUTE_D 19 AGND 18 VTH 17 MUTE_AB 16 EarInR 15 INR 14 V2P5 13 EarOutR 1 PGNDL +OUT_L 2 PVDDL SHDN 4 AVDD VREF PL 6 24 3 5 7 8 9 EarInL INL 10 VOL 11 EarOutL 12 X: Internal Code Y: Year WW: Week LL: Internal Code Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 2 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Pin Descriptions Pin Number Pin Name Description 1 -OUT_L Left Channel Negative Output 2 PGNDL Left Channel Power GND 3 +OUT_L Left Channel Positive Output 4 PVDDL Left Channel Power Supply 5 SHDN Full Chip Shutdown Control Input(active low)， Pull-up 6 AVDD Analog VDD 7 VREF Reference Voltage Both for DC Volume Control and Power Lim it Section 8 PL 9 EarInL Left Earphone input 10 INL Left Channel Input 11 VOL 12 EarOutL Left Earphone output(Non-Inverting) 13 EarOutR Right Earphone output(Non-Inverting) 14 V2P5 15 IN R 16 EarInR 17 MUTE_AB 18 VTH 19 AGND 20 MUTE_D 21 PVDDR Right Channel Power Supply 22 +OUT_R Right Channel Positive Output 23 PGN DR Right Channel Power GND 24 -OUT_R Right Channel Negative Output Connect a Resistor Divider from VREF to GND for Power Limit Setting Apply DC Voltage at This Pin to Set The Gain both of C las s D and Class AB Internal Analog Reference, Connect a Bypass Capacitor from V2P5 to GN D Right Channel Input Right Earphone Input Mute control of Class AB Section (active low)， Pull-up Connect a Resistor from VT H to GND for N oise Threshold Setting Analog GND Mute Control of Class D Section (active high), Pull-down Absolute Maximum Ratings These are stress ratings only and functional operation is not implied . Exposure to absolute maximum ratings for prolonged time periods may affect device reliability . All voltages are with respect to ground . Supply Voltage ............................................6.0V Operation Junction Temperature ....- 40 °C to 125 °C Input Voltage.............................-0.3V to V DD+0.3V Storage Temperature.....................-65°C to 150 °C Soldering Temperature....................... 300°C,5sec Recommended Operating Conditions Supply Voltage Range....................... 2.5V to 5.5V Junction Temperature Rang...........-20 °C to 125 °C Ambient Operation Temperature Range............................................-20 °C to 85 °C Thermal Information Parameter Symbol Package Maximum Unit Thermal Resistance (Junction to Ambient) θJA SSOP-24 96 °C/W Thermal Resistance (Junction to Ambient) θJA SOP-24 79.2 °C/W Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 3 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Electrical Characteristic V DD =5V, Gain = Maximum, R L =8 Ω,T A =25°C ，unless otherwise noted. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V 15 mA 30 mV Class D Stage Supply Voltage Range Quiescent Current Output Offset Voltage Drain-Source On-State Resistance Output Power VD D 2.5 IQ No Load VOS No Load RDS (ON) ID S=0.5A PO 10 P MOSFET 0.21 N M OSFET 0.17 R L= 8Ω R L= 4Ω THD+N=10%, f=1kHz 1.55 1.7 2.85 3.0 Ω W Total Harmonic Distortion Plus Noise THD+N RL = 8Ω，P O =0.85W,f=1KHz RL = 4Ω，P O =1.75W,f=1KHz Power Supply R ipple Rejection Input AC -GND, f=1KHz, Vpp=200mV 70 dB PO=1W , f=1KH z -95 dB PSRR Channel Separation CS Os cillator Frequency fOSC Efficiency Nois e Signal Noise Ratio η Vn 0.08 % 0.08 200 250 PO =1.7W,f=1kHz, R L=8Ω 85 90 % PO =3.0W,f=1kHz, R L=4Ω 80 83 % Input AC-GND A-weighting 60 No A-weighting 80 300 kHz uV SNR f=20-20kHz, THD=1% 95 dB Output Offset Voltage VOS No Load Output Power PO THD+N=1%, RL=32Ω , f=1KHz 60 mW Total Harmonic Distortion Plus Noise THD+N RL = 32Ω，PO =10mW,f=1KH z 0.02 % Power Supply R ipple Rejection Input AC -GND, f=1KHz, Vpp=200mV 80 dB VO=1V, f=1KHz -95 dB Earphone Stage Channel Separation Nois e Signal Noise Ratio PSRR CS Vn 2.45 2.5 Input A-weighting 20 AC-GND No A-w eighting 35 2.55 V uV SNR f=20-20kHz, THD=1% 95 dB IM UTE MUTE_D=VDD, MUTE_AB=GND 7 10 mA Mute Class D Earphone Current I M UTE_D MUTE_D=VDD, MUTE_AB=VDD 7 10 mA Mute Class AB Earphone Current IM UTE_A B MUTE_D=GND,MUTE_AB=VDD 9 10 mA 1 µA Control Section Mute Current Shutdown Current ISH DN Logic Input High VIH Logic Input Low VIL VSH DN =0V 1.4 0.6 V Over Temperature Protect ion OTP 150 °C Over Temperature Hysteresis OTH 40 °C Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 4 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (T =25°C) A V DD =5V,RL =8 Ω, Gv=24dB, ΤΑ =2 5°C, unless otherwise noted Class D Output 1. THD+N vs Output Power 2. THD+N vs Output Power 50 50 R L=8 Ω 20 10 10 5 5 2 2 f=1kHz % f=10kHz % 1 1 f=10kHz 0.5 R L=4 Ω 20 f=100Hz 0 .5 0.2 f=1kHz f=100Hz 0 .2 0.1 0 .1 0.06 0.06 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2 3 10 m 20 m 50 m 100 m W 3. THD+N vs Frequency 500 m 1 2 5 4. THD+N vs Frequency 10 10 R L=8 Ω 5 R L=4 Ω 5 2 2 Po=0.5W 1 % 200 m W 0 .5 Po=0.5W 1 % Po=0.3W 0 .5 Po=0.3W 0 .2 0 .2 0 .1 Po=1W Po=1W 0 .1 0 . 05 0.06 0 . 03 20 50 100 200 500 1k 2k 5k 10 k 20 20 k 50 100 200 500 5. PSRR vs Frequency +0T R L=4 Ω -10 5k 10 k 20 k T T T T T 5k 10k 20k T RL =4 Ω -20 - 20 -30 - 30 -40 - 40 d B 2k 6. Crosstalk vs Frequency +0 - 10 1k Hz Hz R Channel -50 d B - 50 -60 - 60 -70 R to L - 70 L to R -80 - 80 -90 L Channel - 90 -100 20 50 100 200 500 - 100 1k 2k 5k 10 k - 110 20k Hz 20 50 100 200 500 1k 2k Hz Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 5 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (T =25°C) A V DD =5V,RL =8 Ω, Gv=24dB, ΤΑ =2 5°C, unless otherwise noted Class D Output 7.Frequency Response 8. Noise Floor -50 + 30 VDD =2.5V/3.3V/3.6V/ 4.2V/5.0V/5.5V -55 + 28 Cin=1uF -60 + 26 -65 + 24 -70 + 22 d B r Cin=0.47uF + 20 A + 18 d B r -75 A -85 -80 -90 Cin=0.1uF + 16 -95 + 14 -100 + 12 -105 + 10 20 50 100 200 500 1k 2k 5k 10k -110 20 k 20 50 100 200 500 Hz 1k 2k 5k 10 k 20 k Hz 9.Power Dissipation vs Output Power 10.Power Dissipation vs Output Power 180 450 160 400 RL =8 Ω 140 350 120 300 100 250 80 200 60 150 40 100 20 50 0 RL =4 Ω 0 0 500 1000 1500 2000 0 500 1000 Output Power(mW) 1500 2000 2500 3000 3500 30 00 3500 Output Power(mW) 11.Efficiency VS Output Power 12.Efficiency VS Output Power 100 100 R L=8 Ω 90 R L=4 Ω 90 80 80 70 70 60 60 50 50 40 40 30 30 20 20 10 10 0 0 0 500 1000 1500 2000 0 O utput P ower(m W) 500 1000 150 0 2000 250 0 Out put P ower(mW ) Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 6 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (continued) 13. Output Power VS Supply Voltage 14. Output Power VS Supply Voltage 4500 2500 RL =8 Ω RL =4 Ω 4000 2000 3500 3000 1500 2500 2000 1000 1500 1000 500 500 0 0 2 3 4 5 6 2 3 4 S upply V oltage(V ) 5 6 Supply Voltage(V) 15. Rdson VS Output Current 16. Switching Frequency VS Supply Voltage 30 0 254 25 0 252 250 20 0 248 15 0 246 10 0 244 P-MOS 50 242 N-MOS 240 0 0 500 1000 1500 2 20 00 3 12 30 11 20 10 10 9 0 8 -10 7 -20 6 -30 5 -40 4 -50 4 6 60 80 18. Gain Step 17. Quiescent Current 3 5 Supply Voltage(V) Outpu t Curr ent( mA) 2 4 5 0 6 Supply Voltage(V) 20 40 Step Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 7 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (continued) 19. Output Power VS PL-Voltage 20. Noise Threshold VS R TH 50 35 00 45 30 00 40 25 00 35 30 20 00 25 15 00 20 15 10 00 10 5 00 5 0 0 0 0.2 0.4 0.6 0.8 1 1.2 100 PL -V olta ge(V) 150 200 250 300 RTH(k Ω) Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 8 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (continued) V DD =5V,Gv=10dB, ΤΑ= 25 °C, unless otherwise noted Earphone Output 1. THD+N vs Output Power 2. THD+N vs Output Power 10 20 R L=16 Ω 10 5 RL =32 Ω 5 2 2 1 1 % 0.5 0 .5 % f=10kHz 0 .2 f=1kHz 0 .1 0.2 f=100Hz f=10kHz 0.1 0. 05 0.05 0. 02 0.02 0.01 10 u 20 u 50 u 100 u 200 u 500 u 1m 2m 5m 10m 20 m 50 m 0. 01 10u 200 m 20 u 50 u 100 u 200 u 500u 1m W W 3. THD+N vs Frequency 2m 5m R L=16 Ω RL =32Ω Po=50mW Po=50mW 0 .2 Po=1mW Po=1mW 0 .1 % 0.05 0 .1 0.05 0.02 0.02 Po=10mW 50 100 200 500 1k 2k 5k 10 k Po=10mW 0.01 20 k 20 50 100 200 500 Hz 1k 2k 5k 10 k 20 k 2k 5k 10k 20 k Hz 6. Crosstalk vs Frequency 5. PSRR vs Frequency +0 100 m 0 .5 0 .2 +0 T - 10 20 m 1 0 .5 0.01 20 10m 4. THD+N vs Frequency 1 % f=100Hz f=1kHz R L=32 Ω Gv=10dB - 10 RL =32Ω - 20 - 20 - 30 - 30 - 40 - 50 - 40 d B L Channel - 50 - 60 d B R Channel - 60 - 70 L to R R to L - 80 - 70 - 90 -100 - 80 -110 - 90 -120 -100 20 50 100 200 500 1k 2k 5k 10 k -130 20 20 k Hz 50 100 200 500 1k Hz Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 9 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (continued) 7.Frequency Response 8. Noise Floor -8 - 55 -9 Cin=1uF - 60 -1 0 - 65 -11 VDD =2.5V/3.3V/3.6V/ 4.2V/5.0V/5.5V - 70 - 75 -1 2 - 80 d B r -1 3 -1 4 d B r A -1 5 A Cin=0.47uF - 85 - 90 - 95 - 100 -1 6 -1 7 - 105 Cin=0.1uF - 110 - 115 -1 8 - 120 -1 9 -2 0 20 - 125 50 100 200 500 1k 2k 5k 10k - 130 20k Hz 20 50 100 200 500 1k 2k 5k 10 k 20 k Hz 9.Gain Step 10 0 -10 -20 -30 -40 -50 -60 -70 -80 0 20 40 60 80 Step Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 10 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Typical Operating Characteristics (continued) Table 1. DC Volume Control Gain(dB) Gain(dB) Gain(dB) Gain(dB) Class D Earphone Class D Earphone 1 -43.1 -68.5 33 11.9 -9.6 2 -37.2 -57.4 34 12.2 -9 3 -34、3 -49.7 35 12.7 -8.5 4 -27.7 -39.8 36 13 -7.9 5 -22.1 -37.4 37 13.4 -7.3 6 -16.3 -35.2 38 13.8 -6.7 7 -10.3 -33.1 39 14.2 -6.2 8 -7.8 -30.8 40 14.6 -5.7 9 -5.2 -28.7 41 15 -5.2 10 -2.7 -27.7 42 15.4 -4.7 11 0.2 -26.6 43 15.5 -4.2 12 1.3 -25.5 44 15.8 -3.7 13 2.8 -24.3 45 16.2 -3.2 14 3.8 -23.2 46 16.6 -2.7 15 4.2 -22.4 47 17 -2.3 16 4.6 -21.6 48 17.4 -1.9 17 5.4 -20.8 49 17.8 -1.5 18 5.8 -20 50 18.2 -1.1 19 6.2 -19.2 51 18.6 -0.7 20 6.6 -18.4 52 19 -0.32 21 7 -17.6 53 19.4 0.09 22 7.4 -16.7 54 19.8 0.4 23 7.8 -16.1 55 20.2 0.7 24 8.2 -15.4 56 20.6 0.97 25 8.6 -14.7 57 21 1.3 26 9 -14.1 58 21.4 1.6 27 9.4 -13.4 59 21.9 1.9 28 9.8 -12.7 60 22.2 2.2 29 10.3 -12.1 61 22.6 2.35 30 10.5 -11.4 62 23.1 2.6 31 11 -10.8 63 23.5 2.8 32 11.5 -10.2 64 23.9 3 STEP STEP Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 11 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Test Setup for Performance Testing(Class D) Application Notice 1. When the PAM8010 works with LC filters, it should be connected with the speaker before it's powered on, otherwise it will be damaged easily. 2. When the PAM8010 works without LC filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppressing the possible electromagnetic interference. 3. The absolute maximum rating of the PAM8010 operation voltage is 6.0V. When the PAM8010 is powered with 4 battery cells, it should be noted that the voltage of 4 new dry or alkaline batteries is over 6V, higher than its maximum operation voltage, which probably make the device damaged. Therefore, it's recommended to use either 4 Ni-MH (Nickel Metal Hydride) rechargeable batteries or 3 dry or alkaline batteries. 4. The input signal should not be too high, if too high ,it will cause the clipping of output signal when increasing the volume. Because the DC volume control of the PAM8010 has big gain, it will make the device damaged. 5. When testing the PAM8010 without LC filters b y using resistor instead of speaker as the output load, the test results, e.g. THD or efficiency, will be worse than those using speaker as load. PAM8010 Demo Board Load +OUT AP System One Generator Input AP Low Pass Filter GND -OUT AP System Two Analyzer AUX-0025 VDD Power Supply Notes 1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer. 2. Two 22µH inductors are used in series with load resistor to emulate the small speaker for effic iency measurement. Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 12 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Application Information(continued) fC= 1 2πRC i i Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 13 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Application Information(continued) Over Temperature Protection Thermal protection on the PAM8010 prevents the device from damage when the internal die temperature exceeds 150℃. There is a 15 degree tolerance on this trip point from device to device. Once the die temperature exceeds the thermal set point, the device outputs are disabled. This is not a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 40 ℃ . This large hysteresis will prevent motor boating sound well. The device begins normal operation at this point without external system interaction. Before thermal shutdown, the gain of the PAM8010 will drop -3dB when the chip temperature reaches 12 0℃. channel. The switch state diagram illustrates that PGND is instrumental in nearly every switch state. This is the perfect point to which the output noise ground trace should return. Also note that output noise ground is channel specific. A two channel amplifier has two seperate channels and consequently must have two seperate output noise ground traces. The layout of the PAM8010 offers separate PGND connections for each channel and in some cases each side of the bridge. Output noise grounds must be tied to system ground at the power in exclusively. Signal currents for the inputs, reference, etc need to be returned to quite ground. This ground is only tied to the signal components and the GND pin, and GND then tied to system ground. How to Reduce EMI (Electro Magnetic Interference) A simple solution is to put an additional capacitor 1000uF at power supply terminal for power line coupling if the traces from amplifier to speakers are short (<20CM). Most applications require a ferrite bead filter as shown at Figure 1. The ferrite filter reduces EMI around 1 MHz and higher. When selecting a ferrite bead, choose one with high impedance at high frequencies, and low impedance at low frequencies (MH2012HM221-T). F errite Bead OUT+ 200pF F errite Bead OUT200pF Figure 1: Ferrite Bead Filter to reduce EMI PCB Layout Guidelines Grounding At this stage it is paramount to notice the necessity of separate grounds. Noise currents in the output power stage need to be returned to output noise ground and nowhere else. Were these currents to circulate elsewhere, they may get into the power supply, the signal ground, etc, worse yet, they may form a loop and radiate noise. Any of these cases results in degraded amplifier performance. Th e logical returns for the output noise currents associated with Class D switching are the respective PGND pins for each Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 14 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Ordering Information PAM8010 X X X Shipping Number of Pins PackageType Part Number Package Type Standard Package PAM8010NHR SSOP-24 2,500 Units/Tape & Reel PAM8010DHR SOP-24 1,000 Units/Tape & Reel Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 15 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Outline Dimension SSOP-24 Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 16 PAM8010 3W Stereo Class-D with DC Volume, Headphone and Power Limit Outline Dimension SOP-24 Power Analog Microelectronics, Inc www.poweranalog.com 05/2011 Rev1.0 17