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
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