W682388

W682388 Layout Guideline Rev 1.3 - AN-CS006a W682388 Pro-X™ CODEC Layout Guideline www.DataSheet4U.com 1. W682388 Layout Considerations The Winbond W682388 Pro-X™ CODEC family is an excellent solution for short loop telephony applications. Place the components carefully to insure best performance. This document outlines critical component layout issues. Use it together with the W682388 data sheet and other supporting Pro-X application notes. The W682388 will exhibit high-quality low-noise performance with the appropriate layout design. Pins 52–61 are sensitive current input pins that are susceptible to induced noise. Keep traces between these pins and their respective components (C7, C8, C10, C11, R13–16, and R18–27) to a minimum length. Do not route any digital traces near these sensitive traces. Place the line compensation capacitors, C5, C8, C9, and C12, near their respective TIP and RING output pins. Place a 0.1 µF ceramic decoupling capacitor as close as possible to each VDD and VBAT power supply input pin. These are Pin 49 (VDD1), Pin 64 (VDD2), Pin 41 (VDD3), Pin 8 (VDD4), Pin 27 (VDD5) and Pin 26 (VDDL). Replace the 0.1 µF capacitors at VDD1 and VDD2 with 10 µF ceramic capacitors for additional noise performance. Refer to the Figure 3 for an example of this layout. There are two external Tip and Ring capacitors for each channel. They are connected to CT1 (Pin 39), CR1 (Pin 38), CT2 (Pin 10), and CR2 (Pin 11). The capacitor is a 10 µF ceramic (low leakage) capacito...