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CS5521-AP

16-Bit or 24-Bit, 2/4/8-Channel ADCs with PGIA

Cirrus Logic 

CS5521/22/23/24/28

TABLE OF CONTENTS

1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 5

ANALOG CHARACTERISTICS ................................................................................................ 5

TYPICAL RMS NOISE, CS5521/23.......................................................................................... 7

TYPICAL NOISE FREE RESOLUTION (BITS), CS5521/23 .................................................... 7

TYPICAL RMS NOISE, CS5522/24/28..................................................................................... 8

TYPICAL NOISE FREE RESOLUTION (BITS), CS5522/24/28 ............................................... 8

5 V DIGITAL CHARACTERISTICS........................................................................................... 9

3 V DIGITAL CHARACTERISTICS........................................................................................... 9

DYNAMIC CHARACTERISTICS ............................................................................................ 10

RECOMMENDED OPERATING CONDITIONS ..................................................................... 10

ABSOLUTE MAXIMUM RATINGS ......................................................................................... 10

SWITCHING CHARACTERISTICS ........................................................................................ 11

2. GENERAL DESCRIPTION ..................................................................................................... 13

2.1 Analog Input ..................................................................................................................... 13

2.1.1 Instrumentation Amplifier ......................................................................................... 14

2.1.2 Coarse/Fine Charge Buffers ............................................................................... 14

2.1.3 Analog Input Span Considerations .......................................................................... 15

2.1.4 Measuring Voltages Higher than 5 V .................................................................. 15

2.1.5 Voltage Reference .............................................................................................. 16

2.2 Overview of ADC Register Structure and Operating Modes ............................................ 16

2.2.1 System Initialization ............................................................................................ 18

2.2.2 Serial Port Initialization Sequence ...................................................................... 18

2.2.3 Command Register Quick Reference ............................................................... 19

2.2.4 Command Register Descriptions ........................................................................ 20

2.2.5 Serial Port Interface ............................................................................................ 25

2.2.6 Reading/Writing the Offset, Gain, and Configuration Registers .......................... 26

2.2.7 Reading/Writing the Channel-Setup Registers ................................................... 26

2.2.7.1 Latch Outputs ...................................................................................... 28

2.2.7.2 Channel Select Bits ............................................................................. 28

2.2.7.3 Output Word Rate Selection ............................................................... 28

2.2.7.4 Gain Bits .............................................................................................. 28

2.2.7.5 Unipolar/Bipolar Bit ............................................................................. 28

2.2.8 Configuration Register ........................................................................................ 28

2.2.8.1 Chop Frequency Select ....................................................................... 28

2.2.8.2 Conversion/Calibration Control Bits .................................................... 28

2.2.8.3 Power Consumption Control Bits ........................................................ 28

Contacting Cirrus Logic Support

For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:

http://www.cirrus.com/corporate/contacts/

SPI™ is a trademark of Motorola Inc., Microwire™ is a trademark of National Semiconductor Corp.

Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance

product information describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts

to ensure that the information contained in this document is accurate and reliable. However, the information is subject to change without notice

and is provided “AS IS” without warranty of any kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this

information, nor for infringements of patents or other rights of third parties. This document is the property of Cirrus Logic, Inc. and implies no

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DS317F2

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