PAM8406 EVB User Guide PAM8406 EV Board User Guide AE Department 1. Revision Information Date 2011/11/25 Revision V1.0 Description Initial Release Comment 2. EV Board Schematic VDD J5 2 1 + VDD C13 C7 R3 C3 C6 C1 R1 SP1 +OUT-L +OUT-R 1 PGND-L PGND-R 3 -OUT-L -OUT-R PVDD-L 2 FB2 4 5 Mode J4 MUTE 6 VDD 7 INL 8 VREF C5 C10 FB1 C9 U1 16 15 PVDDR 14 13 SHDN 12 SD GND 11 INR 10 Mute 9 MODE PAM8406 C12 FB3 SP2 FB4 C4 C2 R2 C11 C8 VDD J1 VDD Mode 1 2 3 Mode J2 VDD SD 1 2 3 Mute SD J3 VDD 1 2 3 Mute 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. PAM8406 EVB User Guide 3. PAM8406 Demo Board Description PAM8406 demo board is design for PAM8406 demo and evaluation, targeted to be used in providing a simple and convenient evaluation environment for the PAM8406. 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 L- Channels Output Audio Input R- Channels Output Class D /Class AB Select Mute Select Jump Shutdown Select 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 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. PAM8406 EVB User Guide EV Board BOM List Item Value C7,C8 10µF C3,C4 1µF C6 1µF C5 1µF C1,C2, 1µF R1,R2 R4 C13 FB1,FB2,FB3,FB4 10K 10Ω 220µF 2A/120Ω C9,C10,C11,C12, 220pF Type X5R/X7R, Ceramic/0805 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 X5R/X7R, Ceramic/0603 0805 0805 Electrolytic 0805 X5R/X7R, Ceramic/0603 Rating Description 10V PVDD main decoupling CAP 10V PVDD coupling CAP 10V VDD decoupling CAP 10V Vref bypass CAP 10V Input coupling CAP 1% 5% 10V Input Resistor Separate AVCC from PVDD DC coupling CAP For EMI 10V 5. External Components Selection Power Supply decoupling Caps (C3, C4, C6, C7, C8) (1) Low ESR for good THD, PSRR (2) C3,C4 and C6, 1.0µF ceramic for higher frequency transients, spikes (3) C7 and C8, Additional 10uF 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) (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 Input Resistors (R1, R2) (1) Limit the closed-loop gain (2) Form a high pass filter with Ci, and the cut off frequency is fc=1/2*Π*Ri*Ci (3) 1% tolerance needed for resistor matching to improve CMRR, PSRR VREF Bypass Capacitor (C5) (1). 1µF ceramic recommend (2). Need place very closely to the pin for good THD, PSRR EMI Eliminate Filter (FB1, FB2, FB3 and FB4) (1) High impedance at high frequency and very low impedance at low frequency (2) The current rating is higher than 2A 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. PAM8406 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 PAM8406’s pins. (2) The output route should be far away from audio input route. 7. PCB Layout Example Top Layer Figure 3 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. PAM8406 EVB User Guide Bottom Layer 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.