Cirrus Logic CS42L56 - Manual (Page 3)

DS851F2 3
CS42L56
TABLE OF CONTENTS
1. PIN DESCRIPTIONS .............................................................................................................................. 8
1.1 I/O Pin Characteristics .................................................................................................................... 10
2. TYPICAL CONNECTION DIAGRAMS ................................................................................................. 11
3. CHARACTERISTIC AND SPECIFICATION TABLES ......................................................................... 14
RECOMMENDED OPERATING CONDITIONS ................................................................................... 14
ABSOLUTE MAXIMUM RATINGS ....................................................................................................... 14
ANALOG INPUT CHARACTERISTICS ................................................................................................ 14
ADC DIGITAL FILTER CHARACTERISTICS ....................................................................................... 17
HP OUTPUT CHARACTERISTICS ...................................................................................................... 18
LINE OUTPUT CHARACTERISTICS ................................................................................................... 19
ANALOG PASSTHROUGH CHARACTERISTICS ............................................................................... 21
COMBINED DAC INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE ...............................21
SWITCHING SPECIFICATIONS - SERIAL PORT ............................................................................... 22
SWITCHING SPECIFICATIONS - I²C CONTROL PORT ..................................................................... 23
SWITCHING CHARACTERISTICS - SPI CONTROL PORT ................................................................ 24
ANALOG OUTPUT ATTENUATION CHARACTERISTICS .................................................................. 25
DC CHARACTERISTICS ...................................................................................................................... 26
DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS ..................................................... 27
POWER CONSUMPTION - ALL SUPPLIES = 1.8 V ............................................................................ 28
POWER CONSUMPTION - ALL SUPPLIES = 2.5 V ........................................................................... 29
4. APPLICATIONS ................................................................................................................................... 30
4.1 Overview ......................................................................................................................................... 30
4.1.1 Basic Architecture ................................................................................................................. 30
4.1.2 Line Inputs ............................................................................................................................. 30
4.1.3 Line and Headphone Outputs (Class H, Ground-Centered Amplifiers) ................................. 30
4.1.4 Fixed-function DSP Engine ................................................................................................... 30
4.1.5 Beep Generator ..................................................................................................................... 30
4.1.6 Power Management .............................................................................................................. 30
4.2 Analog Inputs .................................................................................................................................. 31
4.2.1 Pseudo-differential Inputs ...................................................................................................... 32
4.2.2 Large-scale Inputs ................................................................................................................. 32
4.2.3 Microphone Inputs ................................................................................................................. 34
4.2.3.1 External Passive Components ................................................................................... 34
4.2.4 Optional VCM Buffer ............................................................................................................. 34
4.2.5 Automatic Level Control (ALC) .............................................................................................. 34
4.2.5.1 Attack/Release Time Calculations: ............................................................................ 36
4.3 Analog In to Analog Out Passthrough ............................................................................................ 36
4.4 Analog Outputs .............................................................................................................................. 37
4.5 Class H Amplifier ............................................................................................................................ 38
4.5.1 Power Control Options .......................................................................................................... 39
4.5.1.1 Standard Class AB Mode (setting 01 and 10) ........................................................... 39
4.5.1.2 Adapt to Volume Mode (setting 00) ........................................................................... 39
4.5.1.3 Adapt to Output Mode (setting 11) ............................................................................. 42
4.5.2 Power Supply Transitions ...................................................................................................... 42
4.5.3 Efficiency ............................................................................................................................... 43
4.6 Beep Generator .............................................................................................................................. 44
4.7 Limiter ............................................................................................................................................. 45
4.8 Serial Port Clocking ........................................................................................................................ 46
4.9 Digital Interface Format .................................................................................................................. 49
4.10 Initialization ................................................................................................................................... 49
4.11 Recommended DAC to HP or Line Power Sequence .................................................................. 49
4.11.1 Power-Up Sequence ........................................................................................................... 49