CS4222_02 Datasheet, PDF (3/29 Pages) Cirrus Logic – 20-Bit Stereo Audio Codec with Volume Control

CS4222
4.6 Control Port Interface ...................................................................................................... 21
4.6.1 SPI Mode ............................................................................................................ 21
4.6.2 I²C Mode ............................................................................................................. 22
4.6.3 Control Port Bit Definitions .................................................................................. 22
4.7 De-Emphasis ................................................................................................................... 22
4.8 Power-up / Reset / Power Down / Calibration ................................................................. 23
4.9 Power Supply, Layout and Grounding ............................................................................. 23
4.10 ADC and DAC Filter Response Plots ............................................................................ 24
5. REGISTER DESCRIPTIONS .............................................................. 25
5. Memory Address Pointer (MAP) ......................................................................................... 25
5. Reserved Byte (0)............................................................................................................... 25
5. ADC Control Byte (1) .......................................................................................................... 25
5. DAC Control Byte (2) .......................................................................................................... 26
5. Output Attenuator Data Byte (3, 4) ..................................................................................... 26
5. DSP Port Mode Byte (5) ..................................................................................................... 27
5. Converter Status Report Byte (Read Only) (6) ................................................................... 27
6. PARAMETER DEFINITIONS .............................................................. 28
7. PACKAGE DIMENSIONS ................................................................... 29
LIST OF FIGURES
Figure 1. Serial Audio Interface Timing........................................................................................... 9
Figure 2. Control Port Timing - SPI Mode ..................................................................................... 10
Figure 3. Control Port Timing - I2C Mode ..................................................................................... 11
Figure 4. CS4222 Recommended Connection Diagram............................................................... 13
Figure 5. Optional Line Input Buffer .............................................................................................. 15
Figure 6. Full Scale Input/Output Voltage ..................................................................................... 15
Figure 7. 2- and 3-Pole Butterworth Filters ................................................................................... 17
Figure 8. Hybrid Analog/Digital Attenuation .................................................................................. 18
Figure 9. Audio DSP Data Input Formats...................................................................................... 20
Figure 10. Audio DSP Data Output Formats................................................................................. 20
Figure 11. Control Port Timing, SPI mode .................................................................................... 21
Figure 12. Control Port Timing, I²C mode ..................................................................................... 22
Figure 13. De-emphasis Curve. .................................................................................................... 22
Figure 14. ADC Filter Response ................................................................................................... 24
Figure 15. ADC Passband Ripplee ............................................................................................... 24
Figure 16. ADC Transition Band ................................................................................................... 24
Figure 17. DAC Filter Response ................................................................................................... 24
Figure 18. DAC Passband Ripple ................................................................................................. 24
Figure 19. DAC Transition Band ................................................................................................... 24
LIST OF TABLES
Table 1. Control Port vs. Stand-Alone Mode ....................................................................................... 14
Table 2. High Pass Filter Characteristics ............................................................................................ 16
Table 3. Common Clock Frequencies ................................................................................................. 19
Table 4. De-Emphasis filter control ..................................................................................................... 22
DS236F1
3