CS42L55 datasheet(3/73 Pages) CIRRUS

3 / 73 page

DS773F1

CS42L55

TABLE OF CONTENTS

1. PIN DESCRIPTIONS .............................................................................................................................. 8

1.1 I/O Pin Characteristics ...................................................................................................................... 9

2. TYPICAL CONNECTION DIAGRAM ................................................................................................... 10

3. CHARACTERISTIC AND SPECIFICATION TABLES ......................................................................... 11

RECOMMENDED OPERATING CONDITIONS ................................................................................... 11

ABSOLUTE MAXIMUM RATINGS .......................................................................................................11

ANALOG INPUT CHARACTERISTICS ................................................................................................ 12

ADC DIGITAL FILTER CHARACTERISTICS ....................................................................................... 13

HP OUTPUT CHARACTERISTICS ......................................................................................................14

LINE OUTPUT CHARACTERISTICS ................................................................................................... 15

ANALOG PASSTHROUGH CHARACTERISTICS ............................................................................... 16

COMBINED DAC INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE .............................. 16

SWITCHING SPECIFICATIONS - SERIAL PORT ............................................................................... 17

SWITCHING SPECIFICATIONS - CONTROL PORT .......................................................................... 18

POWER SUPPLY REJECTION (PSRR) CHARACTERISTICS ........................................................... 19

DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS ..................................................... 19

POWER CONSUMPTION - ALL SUPPLIES = 1.8 V ............................................................................ 20

POWER CONSUMPTION - ALL SUPPLIES = 2.5 V ............................................................................ 21

4. APPLICATIONS ................................................................................................................................... 22

4.1 Overview ......................................................................................................................................... 22

4.1.1 Basic Architecture ................................................................................................................. 22

4.1.2 Line Inputs ............................................................................................................................. 22

4.1.3 Line and Headphone Outputs (Class H, Ground-Centered Amplifiers) ................................. 22

4.1.4 Fixed-Function DSP Engine .................................................................................................. 22

4.1.5 Beep Generator ..................................................................................................................... 22

4.1.6 Power Management .............................................................................................................. 22

4.2 Analog Inputs ................................................................................................................................. 23

4.2.1 Pseudo-Differential Inputs ..................................................................................................... 24

4.2.2 Automatic Level Control (ALC) .............................................................................................. 24

4.3 Analog In to Analog Out Passthrough ............................................................................................ 25

4.4 Analog Outputs .............................................................................................................................. 26

4.5 Class H Amplifier ............................................................................................................................ 27

4.5.1 Power Control Options .......................................................................................................... 27

4.5.1.1 Standard Class AB Operation (Mode 01 and 10) ...................................................... 28

4.5.1.2 Adapted to Volume Settings (Mode 00) ..................................................................... 28

4.5.1.3 Adapted to Output Signal (Mode 11) ......................................................................... 29

4.5.2 Power Supply Transitions ...................................................................................................... 29

4.5.3 Efficiency ............................................................................................................................... 31

4.6 Beep Generator .............................................................................................................................. 31

4.7 Limiter ............................................................................................................................................. 32

4.8 Serial Port Clocking ........................................................................................................................ 34

4.9 Digital Interface Format .................................................................................................................. 34

4.10 Initialization ................................................................................................................................... 34

4.11 Recommended DAC to HP or Line Power-Up Sequence (Playback) .......................................... 35

4.11.1 Recommended Power-Down Sequence ............................................................................. 36

4.12 Recommended PGA to HP or Line Power-Up Sequence (Analog Passthrough) ......................... 36

4.12.1 Recommended Power-Down Sequence ............................................................................. 36

4.13 Required Initialization Settings ..................................................................................................... 37

4.14 Control Port Operation .................................................................................................................. 38

4.14.1 I²C Control ........................................................................................................................... 38

4.14.2 Memory Address Pointer (MAP) .......................................................................................... 39

4.14.2.1 Map Increment (INCR) ............................................................................................. 39

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