Part Name
         Description
CS53L21

 Low Power, Stereo Analog to Digital Converter ( 66 Page)


CIRRUS
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DS700PP1
CS53L21
6.1 Chip I.D. and Revision Register (Address 01h) (Read Only) ......................................................... 40
6.2 Power Control 1 (Address 02h) ...................................................................................................... 40
6.3 MIC Power Control & Speed Control (Address 03h) ...................................................................... 41
6.4 Interface Control (Address 04h) ..................................................................................................... 43
6.5 MIC Control (Address 05h) ............................................................................................................. 44
6.6 ADC Control (Address 06h) ............................................................................................................ 45
6.7 ADCx Input Select, Invert & Mute (Address 07h) ........................................................................... 47
6.8 SPE Control (Address 09h) ............................................................................................................ 48
6.9 ALCX & PGAX Control: ALCA, PGAA (Address 0Ah) & ALCB, PGAB (Address 0Bh) ................. 49
6.10 ADCx Attenuator: ADCA (Address 0Ch) & ADCB (Address 0Dh) ................................................ 50
6.11 ADCx Mixer Volume Control: ADCA (Address 0Eh) & ADCB (Address 0Fh) .............................. 51
6.12 Channel Mixer (Address 18h) ....................................................................................................... 51
6.13 ALC Enable & Attack Rate (Address 1Ch) ................................................................................... 52
6.14 ALC Release Rate (Address 1Dh) ................................................................................................ 52
6.15 ALC Threshold (Address 1Eh) ...................................................................................................... 53
6.16 Noise Gate Configuration & Misc. (Address 1Fh) ......................................................................... 54
6.17 Status (Address 20h) (Read Only) ............................................................................................... 55
7. ANALOG PERFORMANCE PLOTS ....................................................................................................56
7.1 ADC_FILT+ Capacitor Effects on THD+N ...................................................................................... 56
8. EXAMPLE SYSTEM CLOCK FREQUENCIES .................................................................................... 57
8.1 Auto Detect Enabled ....................................................................................................................... 57
8.2 Auto Detect Disabled ...................................................................................................................... 58
9. PCB LAYOUT CONSIDERATIONS ..................................................................................................... 59
9.1 Power Supply, Grounding ............................................................................................................... 59
9.2 QFN Thermal Pad .......................................................................................................................... 59
10. DIGITAL FILTERS .............................................................................................................................. 60
11. PARAMETER DEFINITIONS .............................................................................................................. 61
12. PACKAGE DIMENSIONS ................................................................................................................. 62
THERMAL CHARACTERISTICS .......................................................................................................... 62
13. ORDERING INFORMATION ............................................................................................................. 63
14. REFERENCES .................................................................................................................................... 63
15. REVISION HISTORY ......................................................................................................................... 64
LIST OF FIGURES
Figure 1.Typical Connection Diagram (Software Mode) ............................................................................. 9
Figure 2.Typical Connection Diagram (Hardware Mode) .......................................................................... 10
Figure 3.Serial Audio Interface Slave Mode Timing .................................................................................. 15
Figure 4.Serial Audio Interface Master Mode Timing ................................................................................ 15
Figure 5.Control Port Timing - I²C ............................................................................................................. 16
Figure 6.Control Port Timing - SPI Format ................................................................................................ 17
Figure 7.Analog Input Architecture ............................................................................................................ 22
Figure 8.MIC Input Mix w/Common Mode Rejection .................................................................................24
Figure 9.Differential Input .......................................................................................................................... 24
Figure 10.ALC ........................................................................................................................................... 26
Figure 11.Noise Gate Attenuation ............................................................................................................. 27
Figure 12.Signal Processing Engine ......................................................................................................... 28
Figure 13.Master Mode Timing ................................................................................................................. 30
Figure 14.Tri-State Serial Port .................................................................................................................. 31
Figure 15.I²S Format ................................................................................................................................. 31
Figure 16.Left-Justified Format ................................................................................................................. 32
Figure 17.Initialization Flow Chart ............................................................................................................. 33
Figure 18.Control Port Timing in SPI Mode .............................................................................................. 34
Figure 19.Control Port Timing, I²C Write ................................................................................................... 35
Figure 20.Control Port Timing, I²C Read ................................................................................................... 35
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