PAM8007 EVB User Guide PAM8007 EV Board User Guide AE Department 1. Revision Information Date 2011/03/14 Revision V1.0 Description Initial Release Comment 2. EV Board Schematic 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. PAM8007 EVB User Guide 3. PAM8007 Demo Board Description PAM8007 demo board is design for PAM8007 demo and evaluation, targeted to be used in providing a simple and convenient evaluation environment for the PAM8007. 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. 4. EV Board View Power in: 2.5V to 5.5V Volume Adjust Bar Class D BTL Output Audio Input Headphone Jack Output Test Jump (Sine-wave monitor) Muting Jump Shutdown Jump 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. 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. PAM8007 EVB User Guide EV Board BOM List Item Value C8,C9 10µF C5,C6 1µF C1,C2,C1E,C2E 1µF C4 1µF C7 1µF C19,C20 FB1,FB2,FB3,FB4 220µF 2A/120Ω C10,C11,C12,C13 220pF VR1 50K Type X5R/X7R, Ceramic/0805 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 Electrolytic 0805 X5R/X7R, Ceramic/0603 Rating Description 10V PVDD main decoupling CAP 10V PVDD coupling CAP 10V Input coupling CAP 10V VDD decoupling CAP 10V Vref bypass CAP 10V Class AB output decoupling CAP For EMI 10V For EMI VOL Bias 5. External Components Selection Power Supply decoupling Caps (C4, C5, C6, C8, C9) (1) Low ESR for good THD, PSRR (2) C5,C6 and C4, 1.0µF ceramic for higher frequency transients, spikes. (3) C8 and C9, 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 (C1, C2, C1E2, C2E) (1). Form a high pass filter with Ri, and the cut off frequency is fc=1 /2∏R i* Ci (2). Low leakage current needed, ceramic recommended. VREF Bypass Capacitor (C7) (1). 1uF ceramic recommended. (2). Need place very closely to the pin for good THD, PSRR Class AB Output Capacitors (C19, C20) (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 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. PAM8007 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 PAM8007’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.