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Cirrus Logic

CS5530 Datasheet Preview

CS5530 Datasheet

24-Bit ADC

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CS5530
24-bit ADC with Ultra-low-noise Amplifier
Features & Description
Chopper-stabilized Instrumentation
Amplifier, 64X
• 12 nV/Hz @ 0.1 Hz (No 1/f noise)
• 1200 pA Input Current
Digital Gain Scaling up to 40x
Delta-sigma Analog-to-digital Converter
• Linearity Error: 0.0015% FS
• Noise Free Resolution: Up to 19 bits
Scalable VREF Input: Up to Analog Supply
Simple Three-wire Serial Interface
• SPI™ and Microwire™ Compatible
• Schmitt-trigger on Serial Clock (SCLK)
Onboard Offset and Gain Calibration
Registers
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 CS5530 is a highly integrated ΔΣ Analog-to-Digital
Converter (ADC) which uses charge-balance techniques
to achieve 24-bit performance. The ADC is optimized for
measuring low-level unipolar or bipolar signals in weigh
scale, process control, scientific, and medical
applications.
To accommodate these applications, the ADC includes
a very-low-noise, chopper-stabilized instrumentation
amplifier (12 nV/Hz @ 0.1 Hz) with a gain of 64X. This
device also includes a fourth-order ΔΣ modulator fol-
lowed 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 ADC and a micro-
controller, the converter includes 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 make this device an ideal
solution for weigh scale and process control
applications.
ORDERING INFORMATION
See page 35.
VA+ C1
C2
VREF+ VREF-
VD+
AIN1+
AIN1-
64X
DIFFERENTIAL
4TH ORDER ΔΣ
MODULATOR
PROGRAMMABLE
SINC FIR FILTER
SERIAL
INTERFACE
CS
SDI
SDO
SCLK
VA-
http://www.cirrus.com
LATCH
A0 A1
CLOCK
GENERATOR
OSC1 OSC2
CALIBRATION
SRAM/CONTROL
LOGIC
DGND
Copyright Cirrus Logic, Inc. 2009
(All Rights Reserved)
NOV ‘09
DS742F3




Cirrus Logic

CS5530 Datasheet Preview

CS5530 Datasheet

24-Bit ADC

No Preview Available !

CS5530
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ................................................................. 4
ANALOG CHARACTERISTICS................................................................................ 4
TYPICAL NOISE-FREE RESOLUTION (BITS) ........................................................ 6
5 V DIGITAL CHARACTERISTICS .......................................................................... 7
3 V DIGITAL CHARACTERISTICS .......................................................................... 7
DYNAMIC CHARACTERISTICS .............................................................................. 8
ABSOLUTE MAXIMUM RATINGS ........................................................................... 8
SWITCHING CHARACTERISTICS .......................................................................... 9
2. GENERAL DESCRIPTION .............................................................................................. 11
2.1. Analog Input ........................................................................................................... 11
2.1.1. Analog Input Span .......................................................................................... 12
2.1.2. Voltage Noise Density Performance ........................................................... 12
2.1.3. No Offset DAC ............................................................................................ 12
2.2. Overview of ADC Register Structure and Operating Modes .................................. 12
2.2.1. System Initialization .................................................................................... 12
2.2.2. Command Register Descriptions ................................................................ 14
2.2.3. Serial Port Interface .................................................................................... 16
2.2.4. Reading/Writing On-Chip Registers ............................................................ 17
2.3. Configuration Register ........................................................................................... 17
2.3.1. Power Consumption ................................................................................... 17
2.3.2. System Reset Sequence ............................................................................ 17
2.3.3. Input Short .................................................................................................. 17
2.3.4. Voltage Reference Select .......................................................................... 17
2.3.5. Output Latch Pins ....................................................................................... 18
2.3.6. Filter Rate Select ........................................................................................ 18
2.3.7. Word Rate Select ........................................................................................ 18
2.3.8. Unipolar/Bipolar Select ............................................................................... 18
2.3.9. Open Circuit Detect .................................................................................... 18
2.3.10. Configuration Register Description ........................................................... 19
2.4. Calibration .............................................................................................................. 21
2.4.1. Calibration Registers .................................................................................. 21
2.4.2. Gain Register ............................................................................................. 21
2.4.3. Offset Register ........................................................................................... 21
2.4.4. Performing Calibrations .............................................................................. 22
2.4.5. System Calibration ...................................................................................... 22
2.4.6. Calibration Tips ........................................................................................... 22
2.4.7. Limitations in Calibration Range ................................................................. 23
2.5. Performing Conversions ........................................................................................ 23
2.5.1. Single Conversion Mode ............................................................................. 23
2.5.2. Continuous Conversion Mode .................................................................... 24
2.6. Using Multiple ADCs Synchronously ..................................................................... 25
2.7. Conversion Output Coding .................................................................................... 25
2.7.1. Conversion Data Output Descriptions ........................................................ 26
2.8. Digital Filter ............................................................................................................ 27
2.9. Clock Generator ..................................................................................................... 28
2.10. Power Supply Arrangements ................................................................................. 28
2.11. Getting Started ....................................................................................................... 31
2.12. PCB Layout ............................................................................................................ 31
3. PIN DESCRIPTIONS ...................................................................................................... 32
Clock Generator ......................................................................................................32
Control Pins and Serial Data I/O .............................................................................32
Measurement and Reference Inputs ......................................................................33
Power Supply Connections .....................................................................................33
4. SPECIFICATION DEFINITIONS ..................................................................................... 33
5. PACKAGE DRAWINGS .................................................................................................. 34
6. ORDERING INFORMATION .......................................................................................... 35
7. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION .................... 35
2 DS742F3


Part Number CS5530
Description 24-Bit ADC
Maker Cirrus Logic
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CS5530 Datasheet PDF






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