SBAS535D August   2013  – June 2026 ADS1120

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 SPI Timing Requirements
    7. 6.7 SPI Switching Characteristics
    8. 6.8 Timing Diagrams
    9. 6.9 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Noise Performance
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Multiplexer
      2. 8.3.2  Low-Noise PGA
        1. 8.3.2.1 PGA Common-Mode Voltage Requirements
        2. 8.3.2.2 Bypassing the PGA
      3. 8.3.3  Voltage Reference
      4. 8.3.4  Clock Source
      5. 8.3.5  Modulator
      6. 8.3.6  Digital Filter
      7. 8.3.7  Output Data Rate
      8. 8.3.8  Excitation Current Sources
      9. 8.3.9  Low-Side Power Switch
      10. 8.3.10 Sensor Detection
      11. 8.3.11 System Monitor
      12. 8.3.12 Offset Calibration
      13. 8.3.13 Temperature Sensor
        1. 8.3.13.1 Converting From Digital Codes to Temperature
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Up and Reset
      2. 8.4.2 Conversion Modes
        1. 8.4.2.1 Single-Shot Conversion Mode
        2. 8.4.2.2 Continuous Conversion Mode
      3. 8.4.3 Operating Modes
        1. 8.4.3.1 Normal Mode
        2. 8.4.3.2 Duty-Cycle Mode
        3. 8.4.3.3 Turbo Mode
        4. 8.4.3.4 Power-Down Mode
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1 Chip Select (CS)
        2. 8.5.1.2 Serial Clock (SCLK)
        3. 8.5.1.3 Data Ready (DRDY)
        4. 8.5.1.4 Data Input (DIN)
        5. 8.5.1.5 Data Output and Data Ready (DOUT/DRDY)
        6. 8.5.1.6 SPI Timeout
      2. 8.5.2 Data Format
      3. 8.5.3 Commands
        1. 8.5.3.1 RESET (0000 011xb)
        2. 8.5.3.2 START/SYNC (0000 100xb)
        3. 8.5.3.3 POWERDOWN (0000 001xb)
        4. 8.5.3.4 RDATA (0001 xxxxb)
        5. 8.5.3.5 RREG (0010 rrnnb)
        6. 8.5.3.6 WREG (0100 rrnnb)
      4. 8.5.4 Reading Data
      5. 8.5.5 Sending Commands
      6. 8.5.6 Interfacing with Multiple Devices
    6. 8.6 Register Map
      1. 8.6.1 Configuration Registers
      2. 8.6.2 Register Descriptions
        1. 8.6.2.1 Configuration Register 0 (Address = 00h) [reset = 00h]
        2. 8.6.2.2 Configuration Register 1 (Address = 01h) [reset = 00h]
        3. 8.6.2.3 Configuration Register 2 (Address = 02h) [reset = 00h]
        4. 8.6.2.4 Configuration Register 3 (Address = 03h) [reset = 00h]
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Serial Interface Connections
      2. 9.1.2 Analog Input Filtering
      3. 9.1.3 External Reference and Ratiometric Measurements
      4. 9.1.4 Establishing a Proper Common-Mode Input Voltage
      5. 9.1.5 Unused Inputs and Outputs
      6. 9.1.6 Pseudo Code Example
    2. 9.2 Typical Applications
      1. 9.2.1 K-Type Thermocouple Measurement (–200°C to +1250°C)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 3-Wire RTD Measurement (–200°C to +850°C)
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Design Variations for 2-Wire and 4-Wire RTD Measurements
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Resistive Bridge Measurement
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 Power-Supply Sequencing
      2. 9.3.2 Power-Supply Ramp Rate
      3. 9.3.3 Power-Supply Decoupling
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

6.9 Typical Characteristics

at TA = 25°C, AVDD = 3.3V, AVSS = 0V, and PGA enabled using external VREF = 2.5V (unless otherwise noted)

ADS1120 Input-Referred Offset Voltage vs Temperature
AVDD = 3.3V
Figure 6-3 Input-Referred Offset Voltage vs Temperature
ADS1120 Gain Error vs Temperature
AVDD = 3.3V
Figure 6-5 Gain Error vs Temperature
ADS1120 Integral Nonlinearity vs Differential Input Signal
AVDD = 3.3V, external 2.5V reference, normal mode
Figure 6-7 Integral Nonlinearity vs Differential Input Signal
ADS1120 Integral Nonlinearity vs Differential Input Signal
AVDD = 3.3V, internal reference, normal mode
Figure 6-9 Integral Nonlinearity vs Differential Input Signal
ADS1120 Internal Reference Voltage Histogram
TA = 25°C, data from 5490 devices
Figure 6-11 Internal Reference Voltage Histogram
ADS1120 Internal Oscillator Accuracy vs Temperature
DVDD = 3.3V, normal mode
Figure 6-13 Internal Oscillator Accuracy vs Temperature
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA enabled, TA = –40°C
Figure 6-15 Absolute Input Current vs Absolute Input Voltage
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA enabled, TA = 85°C
Figure 6-17 Absolute Input Current vs Absolute Input Voltage
ADS1120 Differential Input Current vs Differential Input Voltage
AVDD = 3.3V, PGA enabled, AINP = AIN0, AINN = AIN1
Figure 6-19 Differential Input Current vs Differential Input Voltage
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA disabled, TA = –40°C
Figure 6-21 Absolute Input Current vs Absolute Input Voltage
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA disabled, TA = 85°C
Figure 6-23 Absolute Input Current vs Absolute Input Voltage
ADS1120 Differential Input Current vs Differential Input Voltage
AVDD = 3.3V, PGA disabled, AINP = AIN0, AINN = AIN1
Figure 6-25 Differential Input Current vs Differential Input Voltage
ADS1120 IDAC Accuracy vs Compliance Voltage
 
Figure 6-27 IDAC Accuracy vs Compliance Voltage
ADS1120 IDAC Matching vs Temperature
 
Figure 6-29 IDAC Matching vs Temperature
ADS1120 IAVDD vs Temperature
AVDD = 3.3V, internal reference, turbo mode
Figure 6-31 IAVDD vs Temperature
ADS1120 IAVDD vs AVDD
Normal mode, internal reference
Figure 6-33 IAVDD vs AVDD
ADS1120 IDVDD vs Temperature
DVDD = 3.3V
Figure 6-35 IDVDD vs Temperature
ADS1120 Low-Side Power Switch RON vs Temperature
 
Figure 6-37 Low-Side Power Switch RON vs Temperature
ADS1120 Input-Referred Offset Voltage vs Temperature
AVDD = 5.0V
Figure 6-4 Input-Referred Offset Voltage vs Temperature
ADS1120 Gain Error vs Temperature
AVDD = 5.0V
Figure 6-6 Gain Error vs Temperature
ADS1120 Integral Nonlinearity vs Differential Input Signal
AVDD = 5.0V, external 2.5V reference, normal mode
Figure 6-8 Integral Nonlinearity vs Differential Input Signal
ADS1120 Integral Nonlinearity vs Differential Input Signal
AVDD = 5.0V, internal reference, normal mode
Figure 6-10 Integral Nonlinearity vs Differential Input Signal
ADS1120 Internal Reference Voltage vs Temperature
 
Figure 6-12 Internal Reference Voltage vs Temperature
ADS1120 AVDD Power-Supply Rejection Ratio vs Frequency
 
Figure 6-14 AVDD Power-Supply Rejection Ratio vs Frequency
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA enabled, TA = 25°C
Figure 6-16 Absolute Input Current vs Absolute Input Voltage
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA enabled, TA = 125°C
Figure 6-18 Absolute Input Current vs Absolute Input Voltage
ADS1120 Differential Input Current vs Differential Input Voltage
AVDD = 3.3V, PGA enabled, AINP = AIN3, AINN = AIN2
Figure 6-20 Differential Input Current vs Differential Input Voltage
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA disabled, TA = 25°C
Figure 6-22 Absolute Input Current vs Absolute Input Voltage
ADS1120 Absolute Input Current vs Absolute Input Voltage
AVDD = 3.3V, PGA disabled, TA = 125°C
Figure 6-24 Absolute Input Current vs Absolute Input Voltage
ADS1120 Differential Input Current vs Differential Input Voltage
AVDD = 3.3V, PGA disabled, AINP = AIN3, AINN = AIN2
Figure 6-26 Differential Input Current vs Differential Input Voltage
ADS1120 IDAC Accuracy vs Temperature
 
Figure 6-28 IDAC Accuracy vs Temperature
ADS1120 IAVDD vs Temperature
AVDD = 3.3V, internal reference, normal mode
Figure 6-30 IAVDD vs Temperature
ADS1120 IAVDD vs Temperature
AVDD = 3.3V, internal reference, duty-cycle mode
Figure 6-32 IAVDD vs Temperature
ADS1120 IDVDD vs DVDD
 
Figure 6-34 IDVDD vs DVDD
ADS1120 Internal Temperature Sensor Accuracy vs Temperature
 
Figure 6-36 Internal Temperature Sensor Accuracy vs Temperature