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ADS131A04 Datasheet Preview

ADS131A04 Datasheet

Delta-Sigma ADC

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ADS131A02, ADS131A04
SBAS590D – MARCH 2016 – REVISED JANUARY 2018
ADS131A0x 2- or 4-Channel, 24-Bit, 128-kSPS, Simultaneous-Sampling, Delta-Sigma ADC
1 Features
1 2 or 4 Simultaneous-Sampling Differential Inputs
• Data Rates Up to 128 kSPS
• High Performance:
– Single-Channel Accuracy: Better Than 0.1% at
10,000:1 Dynamic Range
– Effective Resolution: 20.6 Bits at 8 kSPS
– THD: –100 dB at 50 Hz and 60 Hz
• Integrated Negative Charge Pump Allows
Absolute Input Voltages Below Ground
• Flexible Analog Power-Supply Operation:
– Using Negative Charge Pump: 3.0 V to 3.45 V
– Unipolar Supply: 3.3 V to 5.5 V
– Bipolar Supply: ±2.5 V
• Digital Supply: 1.65 V to 3.6 V
• Low-Drift Internal Voltage Reference: 6 ppm/°C
• ADC Self Checks
• Cyclic Redundancy Check (CRC) and Hamming
Code Error Correction on Communications
• Multiple SPI Data Interface Modes:
– Asynchronous Interrupt
– Synchronous Master and Slave
• Package: 32-Pin TQFP
• Operating Temperature Range:
–40°C to +125°C
2 Applications
• Power Protection: Circuit Breakers, Relay
Protection
• Energy Metering: Single Phase, Polyphase,
Power Quality
• Test and Measurement
• Battery Test Systems
• Data Acquisition Systems
3 Description
The ADS131A02 and ADS131A04 devices are two-
and four-channel, simultaneous-sampling, 24-bit,
delta-sigma (ΔΣ), analog-to-digital converters (ADCs).
The wide dynamic range, with scalable data rates up
to 128 kSPS, and internal fault monitors make the
ADS131A02 or ADS131A04 a good choice when
designing for energy monitoring, grid protection, and
control applications. The ADC inputs can be
independently and directly interfaced to a resistor-
divider network, a current transformer, or a Rogowski
coil to measure voltage or current. Flexible power-
supply options, including an internal negative charge
pump, are available to maximize the effective
resolution for high dynamic range applications.
Asynchronous and synchronous master and slave
interface options are available, providing ADC
configuration flexibility when chaining multiple devices
in a single system. Several interface checks, ADC
startup checks, and data integrity checks can be
enabled on the interface to report errors in the ADC
and during data transfer.
The complete analog front-end (AFE) solutions are
packaged in a 32-pin TQFP package and are
specified over the industrial temperature range of
–40°C to +125°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS131A0x
TQFP (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Block Diagram
AVDD
REFP REFN
REFEXT
IOVDD
Out-of-Range
Detect
AIN1N
AIN1P
AIN2N
AIN2P
AIN3N
AIN3P
AIN4N
AIN4P
'6 ADC
'6 ADC
'6 ADC
'6 ADC
Reference
Mux
Voltage
Reference
Control and
Serial Interface
Watchdog
Timer
Negative
Charge
Pump
Data Integrity
CLK/XTAL
M[2:0]
RESET
CS
SCLK
DIN
DOUT
DRDY
DONE
XTAL1/CLKIN
XTAL2
AVSS
VNCP
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

ADS131A04 Datasheet Preview

ADS131A04 Datasheet

Delta-Sigma ADC

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ADS131A02, ADS131A04
SBAS590D – MARCH 2016 – REVISED JANUARY 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 5
6 Pin Configuration and Functions ......................... 5
7 Specifications......................................................... 7
7.1 Absolute Maximum Ratings ...................................... 7
7.2 ESD Ratings.............................................................. 7
7.3 Recommended Operating Conditions....................... 8
7.4 Thermal Information .................................................. 8
7.5 Electrical Characteristics........................................... 9
7.6 Timing Requirements: Asynchronous Interrupt
Interface Mode ......................................................... 12
7.7 Switching Characteristics: Asynchronous Interrupt
Interface Mode ......................................................... 12
7.8 Timing Requirements: Synchronous Master Interface
Mode ........................................................................ 13
7.9 Switching Characteristics: Synchronous Master
Interface Mode ......................................................... 13
7.10 Timing Requirements: Synchronous Slave Interface
Mode ........................................................................ 14
7.11 Switching Characteristics: Synchronous Slave
Interface Mode ......................................................... 14
7.12 Typical Characteristics .......................................... 17
8 Parameter Measurement Information ................ 22
8.1 Noise Measurements .............................................. 22
9 Detailed Description ............................................ 25
9.1 Overview ................................................................. 25
9.2 Functional Block Diagram ....................................... 25
9.3 Feature Description................................................. 26
9.4 Device Functional Modes........................................ 34
9.5 Programming........................................................... 36
9.6 Register Maps ........................................................ 55
10 Application and Implementation........................ 67
10.1 Application Information.......................................... 67
10.2 Typical Application ................................................ 74
10.3 Do's and Don'ts ..................................................... 76
10.4 Initialization Set Up .............................................. 78
11 Power Supply Recommendations ..................... 80
11.1 Negative Charge Pump......................................... 80
11.2 Internal Digital LDO............................................... 80
11.3 Power-Supply Sequencing.................................... 80
11.4 Power-Supply Decoupling..................................... 81
12 Layout................................................................... 82
12.1 Layout Guidelines ................................................. 82
12.2 Layout Example .................................................... 83
13 Device and Documentation Support ................. 84
13.1 Documentation Support ....................................... 84
13.2 Related Links ........................................................ 84
13.3 Receiving Notification of Documentation Updates 84
13.4 Community Resources.......................................... 84
13.5 Trademarks ........................................................... 84
13.6 Electrostatic Discharge Caution ............................ 84
13.7 Glossary ................................................................ 84
14 Mechanical, Packaging, and Orderable
Information ........................................................... 85
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (November 2016) to Revision D
Page
• Changed document title from 2- or 4-Channel, 24-Bit, Simultaneously-Sampling, Delta-Sigma ADC to 2- or 4-
Channel, 24-Bit, 128-kSPS, Simultaneous-Sampling, Delta-Sigma ADC .............................................................................. 1
• Changed VAVDD to AVDD, VAVSS to AVSS, VGND to GND, and VIOVDD to IOVDD throughout document ................................ 1
• Changed Features section .................................................................................................................................................... 1
• Changed Description section.................................................................................................................................................. 1
• Deleted footnote 2 ................................................................................................................................................................. 6
• Changed AVDD, AVSS, VNCP, and XTAL2 pin descriptions and footnote 1 for clarity ....................................................... 6
• Changed CAP to GND Power supply voltage parameter specifications from GND – 0.3 V to 0.3 V for the minimum
specification and from GND + 2.0 V to 2.0 V for the maximum specification ........................................................................ 7
• Changed Analog input voltage parameter descriptions from REFEXT to AVDD to REFEXT and from REFN input to
AVSS to REFN ....................................................................................................................................................................... 7
• Changed Digital input voltage parameter description to include the names of the digital input pins ..................................... 7
• Deleted CMRR footnote from Recommended Operating Conditions table ............................................................................ 8
• Added symbol to Reference input voltage parameter ............................................................................................................ 8
• Changed Offset drift parameter typical specification from 1.2 µV/°C to 2.5 µV/°C and maximum specification from 3
µV/°C to 4 µV/°C..................................................................................................................................................................... 9
• Changed Gain drift parameter typical specification from 0.25 ppm/°C to 0.5 ppm/°C .......................................................... 9
• Deleted separate AVDD PSRR specification for the ADS131A02 ........................................................................................ 9
2 Submit Documentation Feedback
Copyright © 2016–2018, Texas Instruments Incorporated
Product Folder Links: ADS131A02 ADS131A04


Part Number ADS131A04
Description Delta-Sigma ADC
Maker etcTI
Total Page 30 Pages
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