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CS5531-AS

16-bit and 24-bit ADCs withUltra-low-noise PGIA

Cirrus Logic 

CS5531/32/33/34-AS

TABLE OF CONTENTS

1. CHARACTERISTICS AND SPECIFICATIONS ..........................................................4

ANALOG CHARACTERISTICS..........................................................................4

TYPICAL RMS NOISE (NV), CS5531/32/33/34 .................................................7

TYPICAL NOISE-FREE RESOLUTION(BITS), CS5532/34 ...............................7

5 V DIGITAL CHARACTERISTICS ....................................................................8

3 V DIGITAL CHARACTERISTICS ....................................................................8

DYNAMIC CHARACTERISTICS ........................................................................9

ABSOLUTE MAXIMUM RATINGS .....................................................................9

SWITCHING CHARACTERISTICS ..................................................................10

2. GENERAL DESCRIPTION .......................................................................................12

2.1. Analog Input ....................................................................................................12

2.1.1. Analog Input Span .................................................................................... 13

2.1.2. Multiplexed Settling Limitations ............................................................13

2.1.3. Voltage Noise Density Performance .....................................................13

2.1.4. No Offset DAC ......................................................................................14

2.2. Overview of ADC Register Structure and Operating Modes ............................14

2.2.1. System Initialization ..............................................................................15

2.2.2. Serial Port Interface ..............................................................................22

2.2.3. Reading/Writing On-Chip Registers ......................................................23

2.3. Configuration Register .....................................................................................23

2.3.1. Power Consumption .............................................................................23

2.3.2. System Reset Sequence ......................................................................23

2.3.3. Input Short ............................................................................................24

2.3.4. Guard Signal .........................................................................................24

2.3.5. Voltage Reference Select .....................................................................24

2.3.6. Output Latch Pins .................................................................................24

2.3.7. Offset and Gain Select ..........................................................................25

2.3.8. Filter Rate Select ..................................................................................25

2.4. Setting up the CSRs for a Measurement .........................................................27

2.5. Calibration ........................................................................................................30

2.5.1. Calibration Registers ............................................................................30

2.5.2. Performing Calibrations ........................................................................31

2.5.3. Self-calibration ......................................................................................31

2.5.4. System Calibration ................................................................................32

2.5.5. Calibration Tips .....................................................................................32

2.5.6. Limitations in Calibration Range ...........................................................33

2.6. Performing Conversions ..................................................................................33

2.6.1. Single Conversion Mode .......................................................................33

2.6.2. Continuous Conversion Mode ..............................................................34

2.6.3. Examples of Using CSRs to Perform Conversions and Calibrations ....35

2.7. Using Multiple ADCs Synchronously ...............................................................36

2.8. Conversion Output Coding ..............................................................................36

2.9. Digital Filter ......................................................................................................38

2.10. Clock Generator ...............................................................................................39

2.11. Power Supply Arrangements ...........................................................................39

2.12. Getting Started ................................................................................................43

2.13. PCB Layout .....................................................................................................43

3. PIN DESCRIPTIONS ...............................................................................................44

4. SPECIFICATION DEFINITIONS ...............................................................................46

5. ORDERING INFORMATION .....................................................................................47

6. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION ..............47

7. PACKAGE DRAWINGS ...........................................................................................48

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DS289F5

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