Cirrus Logic CS8421 - Manual (Page 3)

DS641F6 3
CS8421 CS8421
TABLE OF CONTENTS
1. PIN DESCRIPTIONS ............................................................................................................................ 5
1.1 TSSOP Pin Descriptions ................................................................................................................ 5
1.2 QFN Pin Descriptions ..................................................................................................................... 7
2. CHARACTERISTICS AND SPECIFICATIONS ..................................................................................... 9
SPECIFIED OPERATING CONDITIONS .............................................................................................. 9
ABSOLUTE MAXIMUM RATINGS ........................................................................................................ 9
PERFORMANCE SPECIFICATIONS.................................................................................................. 10
DIGITAL FILTER CHARACTERISTICS .............................................................................................. 11
DC ELECTRICAL CHARACTERISTICS ............................................................................................. 11
DIGITAL INPUT CHARACTERISTICS ................................................................................................ 12
DIGITAL INTERFACE SPECIFICATIONS .......................................................................................... 12
SWITCHING SPECIFICATIONS ......................................................................................................... 12
3. TYPICAL CONNECTION DIAGRAMS ................................................................................................ 14
4. APPLICATIONS .................................................................................................................................. 16
4.1 Three-wire Serial Input/Output Audio Port .................................................................................... 16
4.2 Mode Selection ............................................................................................................................. 17
4.3 Sample Rate Converter (SRC) ..................................................................................................... 19
4.3.1 Data Resolution and Dither .............................................................................................. 19
4.3.2 SRC Locking and Varispeed ............................................................................................ 19
4.3.3 Bypass Mode ................................................................................................................... 19
4.3.4 Muting .............................................................................................................................. 20
4.3.5 Group Delay and Phase Matching Between Multiple CS8421 Parts ............................... 20
4.3.6 Master Clock .................................................................................................................... 20
4.3.7 Clocking ........................................................................................................................... 21
4.4 Time Division Multiplexing (TDM) Mode ....................................................................................... 21
4.5 Reset, Power-Down, and Start-Up ............................................................................................... 22
4.6 Power Supply, Grounding, and PCB Layout ................................................................................ 23
5. PERFORMANCE PLOTS ................................................................................................................ 24
6. PACKAGE DIMENSIONS ................................................................................................................... 33
TSSOP THERMAL CHARACTERISTICS ........................................................................................... 33
QFN THERMAL CHARACTERISTICS ................................................................................................ 34
7. ORDERING INFORMATION ............................................................................................................... 35
8. REVISION HISTORY .......................................................................................................................... 35
LIST OF FIGURES
Figure 1. Non-TDM Slave Mode Timing..................................................................................................... 13
Figure 2. TDM Slave Mode Timing ............................................................................................................ 13
Figure 3. Non-TDM Master Mode Timing................................................................................................... 13
Figure 4. TDM Master Mode Timing .......................................................................................................... 13
Figure 5. Typical Connection Diagram, No External Master Clock ............................................................ 14
Figure 6. Typical Connection Diagram, Master and Slave Modes ............................................................. 15
Figure 7. Serial Audio Interface Format - I²S ............................................................................................. 17
Figure 8. Serial Audio Interface Format - Left-Justified.............................................................................. 17
Figure 9. Serial Audio Interface Format - Right-Justified ........................................................................... 17
Figure 10. Typical Connection Diagram for Crystal Circuit ........................................................................ 21
Figure 11. TDM Slave Mode Timing Diagram............................................................................................ 21
Figure 12. TDM Master Mode Timing Diagram.......................................................................................... 22
Figure 13. TDM Mode Configuration (All CS8421 Outputs are Slave)....................................................... 22
Figure 14. TDM Mode Configuration (First CS8421 Output is Master, All Others are Slave) .................... 22
Figure 15. Wideband FFT Plot (16k Points) 0 dBFS 1 kHz Tone, 48 kHz:48 kHz ..................................... 24
Figure 16. Wideband FFT Plot (16k Points) 0 dBFS 1 kHz Tone, 44.1 kHz:192 kHz ................................ 24
Figure 17. Wideband FFT Plot (16k Points) 0 dBFS 1 kHz Tone, 44.1 kHz:48 kHz .................................. 24