PAM8012 EVB User Guide PAM8012-EV Board User Guide AE Department 1. Revision Information Date 2011/06/09 Revision V1.0 Description Initial Release Comment 2. Key Features 1.0W/2.0W@<1% THD Output with a Supply Voltage from 2.5V to 5.5 V 8Ω/4ΩLoad at 5V Supply Auto Recovering Short Circuit Protection Maximum Output Power Can Be Set by One Over Temperature Protection External Resistor 9 Ball, 1.3mm x 1.3mm, 0.4mm Pitch WCSP Minimized ON/OFF Pop Noise Superior Low Noise High 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. PAM8012 EVB User Guide 3. EV Board Schematic VCC VCC EN EN EN C4 1 2 3 IN- Audio EN C1 VDD U1 OUT+ PL GND IN+ VR EF PAM8012 C2 OUT- SPK PL VCC PL C5 VCC C3 PL RT1 1 2 3 Figure 1 4. PAM8012 TB13AA Description The PAM8012 is a 2.0W mono filter less class-D amplifier with high PSRR and differential input that reduce noise. Features like 89% efficiency and small PCB area make the PAM8012 Class-D amplifier ideal for cellular handsets. The filter less architecture requires no external output filter, fewer external components, less PCB area and lower system costs, and simplifies application design. The PAM8012 features anti-saturation function which detect output signal clip due to the over input level and keep the output non-saturation automatically to get the excellent sound quality. The maximum output power without clip can be set by one resistor at PL pin that to prevent the speaker to be damaged. The PAM8012 features short circuit protection and over temperature protection. The PAM8012 is available in tiny WCSP9 (1.3mm x 1.3mm) package. 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. PAM8012 EVB User Guide 5. EV Board View Power In: 2.5V-5.5V Audio Input Enable Control Selection Jump Speaker Output PL Set Selection Jump EV board Operational sequence: a. Preset the power supply to between 2.5V and 5.5V. b. Turn off the power supply. c. Connect power supply to EV board power. d. Connect audio input from audio input jack. e. Connect the Speaker to the output jack f. Turn on the power supply 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. PAM8012 EVB User Guide EV Board BOM List Item Value Type Rating Description Vender and port C1,C2 0.1µF X5R/X7R, Ceramic/0603 10V Input coupling CAP LMK063BJ104KP-F C3 1µF X5R/X7R, Ceramic/0603 10V VREF decoupling CAP TMK107B7105KA-T C5 1µF X5R/X7R, Ceramic/0603 10V PL decoupling CAP TMK107B7105KA-T C4 1µF X5R/X7R, Ceramic/0805 10V VDD decoupling CAP TMK107B7105KA-T 6. External Components Selection Input Capacitors (C1, C2) (1) Form a high pass filter with Ri, and the cut off frequency is fc=1 /2∏Ri*C i (2) Have a tolerance of 10% or better for matching: any mismatch in capacitance causes an important mismatch at the corner frequency. (3) Low leakage current needed, 1uF, X5R/X7R ceramic Power Supply decoupling Caps ( C4) (1) Low ESR for good THD, PSRR (2) C4, Additional 1uF 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 (3) Need place very closed to the IC VREF Capacitor (C3) (1). 1µF ceramic recommend (2). Need place very closely to the pin for good THD, PSRR 7. PCB Layout Guidelines Grounding (1). Use plane grounding (2). Output noise grounds must tie to system ground at the power in exclusively. (3). Signal currents for the inputs need to be returned to quite ground. This ground only ties to the signal components and the GND pin. Power Supply (1) Recommend that the all the trace could be routed as short and thick as possible. (2) Any barricade placed in the trace could result in the bad performance of the amplifier. Others (1) The power supply capacitors (C4) need to place very close to the PAM8012’s pins. (2) Input capacitors (C1, C2) place closed to input pin as near as possible 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. PAM8012 EVB User Guide 8. PCB Layout Guidelines Top Layer Bottom Layer 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.