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CDB44L11
TABLE OF CONTENTS
1. CDB44L11 SYSTEM OVERVIEW ............................................................................................ 3
2. SCHEMATIC DESCRIPTIONS ................................................................................................. 3
2.1 CS44L11 Headphone Monitor and Output Filter ................................................................ 3
2.2 Clocking ............................................................................................................................. 4
2.3 CS8420 Sample Rate Converter ....................................................................................... 4
2.4 Microcontroller ................................................................................................................... 4
2.5 Power Supplies and Level-Shifting .................................................................................... 4
3. OPERATION INFORMATION ................................................................................................... 6
3.1 Operating Instructions ........................................................................................................ 6
4. CONTROL FUNCTIONS ........................................................................................................... 7
4.1 Control Buttons .................................................................................................................. 7
4.2 LED Status ......................................................................................................................... 7
4.3 CS44L11 Initialization ........................................................................................................ 9
5. BILL OF MATERIALS ........................................................................................................... 17
6. REVISION HISTORY .............................................................................................................. 20
LIST OF FIGURES
Figure 1. CS44L11 PWM Headphone Amplifier ............................................................................ 10
Figure 2. CS8420 S/PDIF Receiver and Sample Rate Converter................................................. 11
Figure 3. Microcontroller................................................................................................................ 12
Figure 4. Power Supply ................................................................................................................. 13
Figure 5. Assembly Drawing ......................................................................................................... 14
Figure 6. Top Layer ....................................................................................................................... 15
Figure 7. Bottom Layer .................................................................................................................. 16
LIST OF TABLES
Table 1. Volume Status LED Decodes ............................................................................................ 8
Table 2. Treble/Bass Boost Status LED Decodes........................................................................... 8
Table 3. Initial CS44L11 Register Settings...................................................................................... 9
Table 4. Revision History .............................................................................................................. 20
2
DS640DB1
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