SBAS946C April   2021  – September 2022 ADS127L11

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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  Timing Requirements (1.65 V ≤ IOVDD ≤ 2 V)
    7. 6.7  Switching Characteristics (1.65 V ≤ IOVDD ≤ 2 V)
    8. 6.8  Timing Requirements (2 V < IOVDD ≤ 5.5 V)
    9. 6.9  Switching Characteristics (2 V < IOVDD ≤ 5.5 V)
    10. 6.10 Timing Diagrams
    11. 6.11 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1  Offset Error Measurement
    2. 7.2  Offset Drift Measurement
    3. 7.3  Gain Error Measurement
    4. 7.4  Gain Drift Measurement
    5. 7.5  NMRR Measurement
    6. 7.6  CMRR Measurement
    7. 7.7  PSRR Measurement
    8. 7.8  SNR Measurement
    9. 7.9  INL Error Measurement
    10. 7.10 THD Measurement
    11. 7.11 SFDR Measurement
    12. 7.12 Noise Performance
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Analog Input (AINP, AINN)
        1. 8.3.1.1 Input Range
      2. 8.3.2 Reference Voltage (REFP, REFN)
        1. 8.3.2.1 Reference Voltage Range
      3. 8.3.3 Clock Operation
        1. 8.3.3.1 Internal Oscillator
        2. 8.3.3.2 External Clock
      4. 8.3.4 Modulator
      5. 8.3.5 Digital Filter
        1. 8.3.5.1 Wideband Filter
        2. 8.3.5.2 Low-Latency Filter (Sinc)
          1. 8.3.5.2.1 Sinc4 Filter
          2. 8.3.5.2.2 Sinc4 + Sinc1 Filter
          3. 8.3.5.2.3 Sinc3 Filter
          4. 8.3.5.2.4 Sinc3 + Sinc1 Filter
      6. 8.3.6 Power Supplies
        1. 8.3.6.1 AVDD1 and AVSS
        2. 8.3.6.2 AVDD2
        3. 8.3.6.3 IOVDD
        4. 8.3.6.4 Power-On Reset (POR)
        5. 8.3.6.5 CAPA and CAPD
      7. 8.3.7 VCM Output Voltage
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Scalable Speed Modes
      2. 8.4.2 Idle Mode
      3. 8.4.3 Standby Mode
      4. 8.4.4 Power-Down Mode
      5. 8.4.5 Reset
        1. 8.4.5.1 RESET Pin
        2. 8.4.5.2 Reset by SPI Register Write
        3. 8.4.5.3 Reset by SPI Input Pattern
      6. 8.4.6 Synchronization
        1. 8.4.6.1 Synchronized Control Mode
        2. 8.4.6.2 Start/Stop Control Mode
        3. 8.4.6.3 One-Shot Control Mode
      7. 8.4.7 Conversion-Start Delay Time
      8. 8.4.8 Calibration
        1. 8.4.8.1 OFFSET2, OFFSET1, OFFSET0 Calibration Registers (Addresses 9h, Ah, Bh)
        2. 8.4.8.2 GAIN2, GAIN1, GAIN0 Calibration Registers (Addresses 0Ch, 0Dh, 0Eh)
        3. 8.4.8.3 Calibration Procedure
    5. 8.5 Programming
      1. 8.5.1 Serial Interface (SPI)
        1. 8.5.1.1 Chip Select (CS)
        2. 8.5.1.2 Serial Clock (SCLK)
        3. 8.5.1.3 Serial Data Input (SDI)
        4. 8.5.1.4 Serial Data Output/Data Ready (SDO/DRDY)
      2. 8.5.2 SPI Frame
      3. 8.5.3 SPI CRC
      4. 8.5.4 Register Map CRC
      5. 8.5.5 Full-Duplex Operation
      6. 8.5.6 Device Commands
        1. 8.5.6.1 No-Operation
        2. 8.5.6.2 Read Register Command
        3. 8.5.6.3 Write Register Command
      7. 8.5.7 Read Conversion Data
        1. 8.5.7.1 Conversion Data
        2. 8.5.7.2 Data Ready
          1. 8.5.7.2.1 DRDY
          2. 8.5.7.2.2 SDO/DRDY
          3. 8.5.7.2.3 DRDY Bit
          4. 8.5.7.2.4 Clock Counting
        3. 8.5.7.3 STATUS Header
      8. 8.5.8 Daisy-Chain Operation
      9. 8.5.9 3-Wire SPI Mode
        1. 8.5.9.1 3-Wire SPI Mode Frame Reset
    6. 8.6 Registers
      1. 8.6.1  DEV_ID Register (Address = 0h) [reset = 00h]
      2. 8.6.2  REV_ID Register (Address = 1h) [reset = xxh]
      3. 8.6.3  STATUS Register (Address = 2h) [reset = x1100xxxb]
      4. 8.6.4  CONTROL Register (Address = 3h) [reset = 00h]
      5. 8.6.5  MUX Register (Address = 4h) [reset = 00h]
      6. 8.6.6  CONFIG1 Register (Address = 5h) [reset = 00h]
      7. 8.6.7  CONFIG2 Register (Address = 6h) [reset = 00h]
      8. 8.6.8  CONFIG3 Register (Address = 7h) [reset = 00h]
      9. 8.6.9  CONFIG4 Register (Address = 8h) [reset = 00h]
      10. 8.6.10 OFFSET2, OFFSET1, OFFSET0 Registers (Addresses = 9h, Ah, Bh) [reset = 00h, 00h, 00h]
      11. 8.6.11 GAIN2, GAIN1, GAIN0 Registers (Addresses = Ch, Dh, Eh) [reset = 40h, 00h, 00h]
      12. 8.6.12 CRC Register (Address = Fh) [reset = 00h]
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 SPI Operation
      2. 9.1.2 Input Driver
      3. 9.1.3 Antialias Filter
      4. 9.1.4 Reference Voltage
      5. 9.1.5 Simultaneous-Sampling Systems
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  10. 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
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.11 Typical Characteristics

AVDD1 = 5 V, AVDD2 = 5 V, AVSS = 0 V, IOVDD = 1.8 V, VREF = 4.096 V, high-reference range, high-speed mode, wideband filter, OSR = 32, 1x input range, input precharge buffers on, reference precharge buffer off, and TA = 25°C (unless otherwise noted)

Wideband filter, OSR = 32, high-speed mode,
524,288 samples
Figure 6-6 Shorted Input FFT
Wideband filter, OSR = 32, low-speed mode,
524,288 samples
Figure 6-8 Shorted Input FFT
2x input range, VREF = 2.5 V, wideband filter, OSR = 32,
high-speed mode, 524,288 samples
Figure 6-10 Shorted Input FFT
Sinc4 filter, OSR = 32, high-speed mode,
524,288 samples
Figure 6-12 Shorted Input FFT
Sinc4 filter, OSR = 12, high-speed mode,
524,288 samples
Figure 6-14 Shorted Input FFT
Input precharge buffers on, wideband filter, OSR = 32,
high-speed mode, VIN = –0.2 dBFS, 65,536 samples
Figure 6-16 Full-Scale Input FFT
Input precharge buffers on, wideband filter, OSR = 32,
low-speed mode, VIN = –0.2 dBFS, 65,536 samples
Figure 6-18 Full-Scale Input FFT
Shorted input, wideband filter, OSR = 32
Figure 6-20 Output Data Distributions
Shorted input, sinc4 filter, OSR = 64, N = 30
Figure 6-22 Total Noise Performance Distributions
Shorted input
 
Figure 6-24 Total Noise Performance vs Temperature
Wideband filter, OSR = 64
 
Figure 6-26 SNR vs Signal Amplitude
Precharge buffers off, 1x and 2x input range,
VREF = 2.5 V, VCM = 2.5 V
Figure 6-28 Input Current vs Differential Input Voltage
VIN = full scale, VCM = 2.5 V, precharge buffers on
Figure 6-30 Input Current vs Temperature
VIN = 0 V, VCM = 2.5 V, precharge buffers on
Figure 6-32 Analog Input Current vs Temperature
 
 
Figure 6-34 Offset Error vs Temperature
N = 30, offset error calibrated at t = 0
Figure 6-36 Long-Term Offset Drift
N = 3
Figure 6-38 Gain Error vs Temperature
N = 30, gain error calibrated at t = 0
 
Figure 6-40 Long-Term Gain Drift
 
Figure 6-42 THD Distribution
 
Figure 6-44 INL Error vs Input Voltage
N = 30
Figure 6-46 INL Distributions
N = 30
Figure 6-48 DC CMRR Distribution
High-speed mode
Figure 6-50 CMRR vs Frequency
N = 30
Figure 6-52 Oscillator Frequency Distribution
N = 30
Figure 6-54 VCM Voltage Distribution
REFP precharge buffer off
Figure 6-56 Reference Input Current vs Reference Voltage
N = 30
Figure 6-58 DC PSRR Distribution
 
 
Figure 6-60 PSRR vs Power-Supply Frequency
Low-speed mode
Figure 6-62 Power-Supply Current vs Temperature
 
Figure 6-64 Power-Down Mode Supply Current vs Temperature
Wideband filter, OSR = 32, high-speed mode,
524,288 samples
Figure 6-7 Shorted Input FFT
Wideband filter, OSR = 32, low-speed mode,
524,288 samples
Figure 6-9 Shorted Input FFT
2x input range, VREF = 2.5 V, wideband filter, OSR = 32,
low-speed mode, 524,288 samples
Figure 6-11 Shorted Input FFT
Sinc4 filter, OSR = 32, low-speed mode,
524,288 samples
Figure 6-13 Shorted Input FFT
Sinc4 filter, OSR = 12, low-speed mode,
524,288 samples
Figure 6-15 Shorted Input FFT
Input precharge buffers off, wideband filter, OSR = 32,
high-speed mode, VIN = –0.2 dBFS, 65,536 samples
Figure 6-17 Full-Scale Input FFT
Input precharge buffers off, wideband filter, OSR = 32,
low-speed mode, VIN = –0.2 dBFS, 65,536 samples
Figure 6-19 Full-Scale Input FFT
Shorted input, wideband filter, OSR = 64, N = 30
Figure 6-21 Total Noise Performance Distributions
Shorted input, wideband filter, OSR = 32
Figure 6-23 Total Noise Performance vs Reference Voltage
Wideband filter, OSR = 64, N = 30
Figure 6-25 SNR Distributions
Precharge buffers on, 2x input range,
VREF = 2.5 V, VCM = 2.5 V
Figure 6-27 Input Current vs Differential Input Voltage
VIN = full scale, VCM = 2.5 V, precharge buffers off
 
 
Figure 6-29 Input Current vs Temperature
VIN = 0 V, VCM = 2.5 V, precharge buffers off
Figure 6-31 Input Current vs Temperature
N = 30
Figure 6-33 Offset Error Distribution
N = 30
Figure 6-35 Offset Drift Distribution
N = 30
Figure 6-37 Gain Error Distribution
Gain error calibrated at nominal clock frequency
Figure 6-39 Gain Error vs Clock Frequency
N = 30
 
Figure 6-41 Gain Drift Distributions
 
 
Figure 6-43 THD vs Input Signal Amplitude
 
Figure 6-45 INL Error vs Input Voltage
N = 30
Figure 6-47 INL vs Temperature
N = 30
 
Figure 6-49 DC CMRR vs Temperature
Low-speed mode
Figure 6-51 CMRR vs Frequency
N = 30
 
Figure 6-53 Oscillator Frequency vs Temperature
N = 30
 
Figure 6-55 VCM Voltage vs Temperature
REFP precharge buffer on
Figure 6-57 REFP Input Current vs Reference Voltage
 
 
Figure 6-59 DC PSRR vs Temperature
High-speed mode
Figure 6-61 Power-Supply Current vs Temperature
 
Figure 6-63 Power-Supply Current vs Oversampling Ratio