AN214 - Cirrus Logic

AN214 6-Channel Audio Design

AN214 Application Note CS4201/CS4202 SIX CHANNEL AUDIO DESIGN 1. INTRODUCTION This application note describes how to create a six channel AC '97 audio sub-system on a PC motherboard that can accommodate either the CS4201 or the CS4202 audio codec. 2. CS4201/CS4202 DUAL DESIGN Figure 1 illustrates a circuit that accommodates both CS4201 and CS4202 codecs, .

Features

The audio driver will read the state of pin 33 on the CS4202 to detect two channel vs. six channel implementation. For six channel operation, pin 33 is tied to digital ground through a pull-down resistor. For information on two channel dual CS4201/CS4202 designs, see the application note AN213. Pin 48 of the CS4201 is used for S/PDIF, or as the second serial data output. On the CS4202, pin 48 is a dedicated S/PDIF output and the second serial data output is located on pin 34. (CS4201)CS4202 U2 (FLTO) GPIO4/SDO2 34 (FLTI) GPIO3 33 Populate 4202 Only R4 0 C9 Populate 4201 Only 1000pF NPO R5.