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ADS131M08 8-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
SBAS950B
October 2019 – February 2021
ADS131M08
PRODUCTION DATA
CONTENTS
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ADS131M08 8-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Switching Characteristics
6.8
Timing Diagrams
6.9
Typical Characteristics
7
Parameter Measurement Information
7.1
Noise Measurements
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Input ESD Protection Circuitry
8.3.2
Input Multiplexer
8.3.3
Programmable Gain Amplifier (PGA)
8.3.4
Voltage Reference
8.3.5
Clocking and Power Modes
8.3.6
ΔΣ Modulator
8.3.7
Digital Filter
8.3.7.1
Digital Filter Implementation
8.3.7.1.1
Fast-Settling Filter
8.3.7.1.2
SINC3 and SINC3 + SINC1 Filter
8.3.7.2
Digital Filter Characteristic
8.3.8
DC Block Filter
8.3.9
Internal Test Signals
8.3.10
Channel Phase Calibration
8.3.11
Calibration Registers
8.3.12
Communication Cyclic Redundancy Check (CRC)
8.3.13
Register Map CRC
8.4
Device Functional Modes
8.4.1
Power-Up and Reset
8.4.1.1
Power-On Reset
8.4.1.2
SYNC/RESET Pin
8.4.1.3
RESET Command
8.4.2
Fast Startup Behavior
8.4.3
Conversion Modes
8.4.3.1
Continuous-Conversion Mode
8.4.3.2
Global-Chop Mode
8.4.4
Power Modes
8.4.5
Standby Mode
8.4.6
Current-Detect Mode
8.5
Programming
8.5.1
Interface
8.5.1.1
Chip Select (CS)
8.5.1.2
Serial Data Clock (SCLK)
8.5.1.3
Serial Data Input (DIN)
8.5.1.4
Serial Data Output (DOUT)
8.5.1.5
Data Ready (DRDY)
8.5.1.6
Conversion Synchronization or System Reset (SYNC/RESET)
8.5.1.7
SPI Communication Frames
8.5.1.8
SPI Communication Words
8.5.1.9
ADC Conversion Data
8.5.1.9.1
Collecting Data for the First Time or After a Pause in Data Collection
8.5.1.10
Commands
8.5.1.10.1
NULL (0000 0000 0000 0000)
8.5.1.10.2
RESET (0000 0000 0001 0001)
8.5.1.10.3
STANDBY (0000 0000 0010 0010)
8.5.1.10.4
WAKEUP (0000 0000 0011 0011)
8.5.1.10.5
LOCK (0000 0101 0101 0101)
8.5.1.10.6
UNLOCK (0000 0110 0110 0110)
8.5.1.10.7
RREG (101a aaaa annn nnnn)
8.5.1.10.7.1
Reading a Single Register
8.5.1.10.7.2
Reading Multiple Registers
8.5.1.10.8
WREG (011a aaaa annn nnnn)
8.5.1.11
Short SPI Frames
8.5.2
Synchronization
8.6
Registers
9
Application and Implementation
9.1
Application Information
9.1.1
Unused Inputs and Outputs
9.1.2
Antialiasing
9.1.3
Minimum Interface Connections
9.1.4
Power Metrology Applications
9.1.5
Multiple Device Configuration
9.1.6
Code Example
9.1.7
Troubleshooting
9.2
Typical Application
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Voltage Measurement Front-End
9.2.2.2
Current Measurement Front-End
9.2.2.3
ADC Setup
9.2.2.4
Calibration
9.2.2.5
Formulae
9.2.3
Application Curves
10
Power Supply Recommendations
10.1
CAP Pin Behavior
10.2
Power-Supply Sequencing
10.3
Power-Supply Decoupling
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
Device and Documentation Support
12.1
Documentation Support
12.1.1
Related Documentation
12.2
Receiving Notification of Documentation Updates
12.3
Support Resources
12.4
Trademarks
12.5
Electrostatic Discharge Caution
12.6
Glossary
13
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
PBS|32
MPQF027A
RSN|32
MPQF194B
Thermal pad, mechanical data (Package|Pins)
PBS|32
QFND381
RSN|32
QFND189E
Orderable Information
sbas950b_oa
sbas950b_pm
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DATA SHEET
ADS131M08 8-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
1
Features
8
simultaneously sampling differential inputs
Programmable data rate up to 32 kSPS
Programmable gain up to 128
Noise performance:
102-dB dynamic range at gain = 1, 4 kSPS
80-dB dynamic range at gain = 64, 4 kSPS
Total harmonic distortion: –100 dB
High-impedance inputs for direct sensor connection:
Input impedance 330-kΩ for gains of
1, 2, and 4
Input impedance ≥ 1-MΩ for gains of
8, 16, 32, 64, and 128
Programmable channel-to-channel phase delay calibration:
244-ns resolution, 8.192-MHz f
CLKIN
Current-detect mode allows for extremely low power tamper detection
Fast startup: first data within 0.5 ms of supply ramp
Integrated negative charge pump allows input signals below ground
Crosstalk between channels: –120 dB
Low-drift internal voltage reference
Cyclic redundancy check (CRC) on communications and register map
2.7-V to 3.6-V analog and digital supplies
Low power consumption: 6.0 mW at 3-V AVDD and DVDD
Packages: 32-pin TQFP or 32-pin WQFN
Operating temperature range: –40°C to +125°C
2
Applications
Electricity meters: commercial and residential
Circuit breakers
Protection relays
Power quality meters
Battery test equipment
Battery management systems