24-bit ADC. CS5534-AS Datasheet

CS5534-AS ADC. Datasheet pdf. Equivalent

Part CS5534-AS
Description 16-bit and 24-bit ADC
Feature CS5531/32/33/34-AS 16-bit and 24-bit ADCs with Ultra-low-noise PGIA Features Chopper-stabilized P.
Manufacture Cirrus Logic
Datasheet
Download CS5534-AS Datasheet



CS5534-AS
CS5531/32/33/34-AS
16-bit and 24-bit ADCs with Ultra-low-noise PGIA
Features
Chopper-stabilized PGIA (Programmable
Gain Instrumentation Amplifier, 1x to 64x)
12 nV/Hz @ 0.1 Hz (No 1/f noise) at 64x
1200 pA Input Current with Gains >1
Delta-sigma Analog-to-digital Converter
Linearity Error: 0.0007% FS
Noise Free Resolution: Up to 23 bits
Two- or Four-channel Differential MUX
Scalable Input Span via Calibration
±5 mV to differential ±2.5V
Scalable VREF Input: Up to Analog Supply
Simple Three-wire Serial Interface
SPI™ and Microwire™ Compatible
Schmitt Trigger on Serial Clock (SCLK)
R/W Calibration Registers Per Channel
Selectable Word Rates: 6.25 to 3,840 Sps
Selectable 50 or 60 Hz Rejection
Power Supply Configurations
VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V
VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V
VA+ = +3 V; VA- = -3 V; VD+ = +3 V
General Description
The CS5531/32/33/34 are highly integrated  Analog-
to-Digital Converters (ADCs) which use charge-balance
techniques to achieve 16-bit (CS5531/33) and 24-bit
(CS5532/34) performance. The ADCs are optimized for
measuring low-level unipolar or bipolar signals in weigh
scale, process control, scientific, and medical
applications.
To accommodate these applications, the ADCs come as
either two-channel (CS5531/32) or four-channel
(CS5533/34) devices and include a very low noise chop-
per-stabilized instrumentation amplifier (6 nV/Hz @ 0.1
Hz) with selectable gains of 1×, 2×, 4×, 8×, 16×, 32×, and
64×. These ADCs also include a fourth order  modu-
lator followed by a digital filter which provides twenty
selectable output word rates of 6.25, 7.5, 12.5, 15, 25, 30,
50, 60, 100, 120, 200, 240, 400, 480, 800, 960, 1600,
1920, 3200, and 3840 Sps (MCLK = 4.9152 MHz).
To ease communication between the ADCs and a micro-
controller, the converters include a simple three-wire se-
rial interface which is SPI and Microwire compatible with
a Schmitt-trigger input on the serial clock (SCLK).
High dynamic range, programmable output rates, and
flexible power supply options makes these ADCs ideal
solutions for weigh scale and process control
applications.
ORDERING INFORMATION
See page 47
VA+ C1 C2 VREF+ VREF-
VD+
AIN1+
AIN1-
AIN2+
AIN2-
AIN3+
AIN3-
AIN4+
AIN4-
MUX
(CS5533/34
SHOWN)
PGIA
1,2,4,8,16
32,64
DIFFERENTIAL
4TH ORDER  
MODULATOR
LATCH
VA-
A0/GUARD
A1
PROGRAMMABLE
SINC FIR FILTER
SERIAL
INTERFACE
CS
SDI
SDO
SCLK
CLOCK
GENERATOR
OSC1 OSC2
CALIBRATION
SRAM/CONTROL
LOGIC
DGND
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2010-2019
(All Rights Reserved)
DEC ‘19
DS289F7



CS5534-AS
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
2 DS289F7





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