PAM8010 EVB User Guide PAM8010 EV Board User Guide AE Department 1. Revision Information Date 2011/05/19 Revision V1.0 Description Initial Release Comment 2. EV Board Schematic Speaker-L SHDN SD 1 2 3 VDD Mute-D C14 Speaker-R C15 FB1 Mute-D 1 2 3 FB2 Mute-AB Mute-AB 2 1 2 3 3 C13 C12 4 SD R4 VDD C1 5 6 7 R2 R1 8 9 V1 FB4 U1 VDD Audio-in C17 FB3 C9 1 VDD C16 VDD C4 C3 R6 R5 10 11 12 -OUT-L -OUT-R PGNDL PGNDR +OUT-L +OUT-R PVDDL PVDDR SHDN AVDD VREF PL EarInL Mute-D PAM8010 VDD AGND VTH Mute-AB EarInR INL INR VOL V2P5 EarOutL EarOutR 24 23 22 C10 C11 21 20 VDD Mute-D 19 R3 18 17 Mute-AB 16 15 14 R8 R7 C6 C2 C5 Ear PHONE 13 C7 C8 Figure 1 Demo Board Schematic This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8010 EVB User Guide 3. PAM8010 Bemo Board Description PAM8010 demo board is designed for PAM8010 demo and evaluation, targeted to be used in providing a simple and convenient evaluation environment for the PAM8010. Requires parts, potentiometer for standard RCA jacks for audio inputs, pin jacks for power supply and signal outputs, low-pass RC output filter for each channel, etc. on the board make it easy to be evaluated. Class D Output 4. EV Board View Power Input Mute-D SHDN Mute-AB Volume Control Earphone Output Audio Input Figure 2 Demo Board Top View EV Board Operational Sequence: a. Preset the power supply to between 2.5V and 5.5V. b. Connect power supply to EV board power. c. Connect audio input from audio input jack. d. Connect the SPKs to the BTL output jack. e. Turn on the power supply and verify that the sound quality of speaker. f. Turn on the power supply and verify that the sound quality of speaker. This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8010 EVB User Guide EV Board BOM List Item C11,C13 C10,C12 C3,C4,C5,C6 C2 C1 VR1 C7,C8 FB1,FB2,FB3,FB4 C14,C15,C16,C17 Value 10uF 1uF 0.47uF 1uF 1uF 50K 220uF 2A/120Ω 1nF Type X5R/X7R,Ceramic/0805 X5R/X7R,Ceramic/0603 X5R/X7R,Ceramic/0805 X5R/X7R,Ceramic/0603 X5R/X7R,Ceramic/0603 Rating 10V 10V 10V 10V 10V Electrolytic 0805 X5R/X7R,Ceramic/0603 10V Description PVDD main decoupling CAP PVDD coupling CAP Input coupling CAP V2P5 bypass CAP Vref bypass CAP VOL Bias Class AB output Blocking CAP 10V For EMI 5. External Components Selection Power Supply decoupling Caps (C10, C11, C12, C13) (1) Low ESR for good THD, PSRR (2) C10 andC12 1.0µF ceramic for higher frequency transients, spikes (3) C11 and C13, additional 10µF or greater for low frequency noise filtering and serves as a local storage capacitor for supplying current during large signal transients on the amplifier outputs (4) Need place very closed to the IC Input Capacitors (C3, C4, C5, C6) (1) Form a high pass filter with Ri, and the cut off frequency is fc=1 /2∏R i*C i (2) Low leakage current needed, ceramic recommend Class AB Output Capacitors (C7, C8) (1) Form a low pass filter with RL, and the cut off frequency is fc=1 /2∏R L*CO i (2) Low leakage current needed V2P5 Bypass Capacitor (C2) (1) 1µF ceramic recommend (2) Need place very closely to the pin for good THD, PSRR This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM8010 EVB User Guide 6. PCB Layout Guidelines Grounding (1) Use plane grounding or separate grounds (2) Do not use one line connecting power GND and analog GND (3) Output noise grounds must tie to system ground at the power in exclusively. (4) Signal currents for the inputs need to be returned to quite ground. This ground only ties to the signal components and the GND pin. Others (1) The power supply de coupling capacitors need to place very close to the PAM8010’s pins. (2) The output route should be far away from audio input route. 7. PCB Layout Example Top Layer Bottom Layer Figure 3 Figure 4 This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.