JAJSD74E February   2016  – August 2022 ADS8681 , ADS8685 , ADS8689

PRODUCTION DATA  

  1. 特長
  2. アプリケーション
  3. 概要
  4. Revision History
  5. Pin Configuration and Functions
  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: Conversion Cycle
    7. 6.7  Timing Requirements: Asynchronous Reset
    8. 6.8  Timing Requirements: SPI-Compatible Serial Interface
    9. 6.9  Timing Requirements: Source-Synchronous Serial Interface (External Clock)
    10. 6.10 Timing Requirements: Source-Synchronous Serial Interface (Internal Clock)
    11. 6.11 Timing Diagrams
    12. 6.12 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input Structure
      2. 7.3.2 Analog Input Impedance
      3. 7.3.3 Input Protection Circuit
      4. 7.3.4 Programmable Gain Amplifier (PGA)
      5. 7.3.5 Second-Order, Low-Pass Filter (LPF)
      6. 7.3.6 ADC Driver
      7. 7.3.7 Reference
        1. 7.3.7.1 Internal Reference
        2. 7.3.7.2 External Reference
      8. 7.3.8 ADC Transfer Function
      9. 7.3.9 Alarm Features
        1. 7.3.9.1 Input Alarm
        2. 7.3.9.2 AVDD Alarm
    4. 7.4 Device Functional Modes
      1. 7.4.1 Host-to-Device Connection Topologies
        1. 7.4.1.1 Single Device: All multiSPI Options
        2. 7.4.1.2 Single Device: Standard SPI Interface
        3. 7.4.1.3 Multiple Devices: Daisy-Chain Topology
      2. 7.4.2 Device Operational Modes
        1. 7.4.2.1 RESET State
        2. 7.4.2.2 ACQ State
        3. 7.4.2.3 CONV State
    5. 7.5 Programming
      1. 7.5.1 Data Transfer Frame
      2. 7.5.2 Input Command Word and Register Write Operation
      3. 7.5.3 Output Data Word
      4. 7.5.4 Data Transfer Protocols
        1. 7.5.4.1 Protocols for Configuring the Device
        2. 7.5.4.2 Protocols for Reading From the Device
          1. 7.5.4.2.1 Legacy, SPI-Compatible (SYS-xy-S) Protocols with a Single SDO-x
          2. 7.5.4.2.2 Legacy, SPI-Compatible (SYS-xy-S) Protocols With Dual SDO-x
          3. 7.5.4.2.3 Source-Synchronous (SRC) Protocols
            1. 7.5.4.2.3.1 Output Clock Source Options
            2. 7.5.4.2.3.2 Output Bus Width Options
    6. 7.6 Register Maps
      1. 7.6.1 Device Configuration and Register Maps
        1. 7.6.1.1 DEVICE_ID_REG Register (address = 00h)
        2. 7.6.1.2 RST_PWRCTL_REG Register (address = 04h)
        3. 7.6.1.3 SDI_CTL_REG Register (address = 08h)
        4. 7.6.1.4 SDO_CTL_REG Register (address = 0Ch)
        5. 7.6.1.5 DATAOUT_CTL_REG Register (address = 10h)
        6. 7.6.1.6 RANGE_SEL_REG Register (address = 14h)
        7. 7.6.1.7 ALARM_REG Register (address = 20h)
        8. 7.6.1.8 ALARM_H_TH_REG Register (address = 24h)
        9. 7.6.1.9 ALARM_L_TH_REG Register (address = 28h)
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power Supply Decoupling
      2. 8.3.2 Power Saving
        1. 8.3.2.1 NAP Mode
        2. 8.3.2.2 Power-Down (PD) Mode
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 サポート・リソース
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

Typical Characteristics

at TA = 25°C, AVDD = 5 V, DVDD = 3 V, VREF = 4.096 V (internal), and maximum throughput (unless otherwise noted)

GUID-32F1C48E-A703-4E5E-A0A1-92946F66140A-low.gif
 
Figure 6-9 Input I-V Characteristic Across Input Ranges
GUID-8D8DA487-DBE3-4267-BF01-3AD8CBD3A0F5-low.gif
 
Figure 6-11 Input Impedance Drift vs Temperature
GUID-0A4F5B8B-43AF-49FC-B4E4-BAB2C45979A2-low.gif
Mean = 32768.24, sigma = 0.57, input = 0 V
Figure 6-13 DC Histogram for Mid-Scale Inputs (±12.288 V)
GUID-C927CA32-8F57-4CAD-A7DD-27A70FED5F96-low.gif
Mean = 32768.21, sigma = 0.62, input = 0 V
Figure 6-15 DC Histogram for Mid-Scale Inputs (±6.144 V)
GUID-7C91A801-37E2-4C51-99DE-6002771B7034-low.gif
Mean = 32768.22, sigma = 0.75, input = 0 V
Figure 6-17 DC Histogram for Mid-Scale Inputs (±2.56 V)
GUID-0E08B622-80A0-4C3C-9C43-20AA8231C26E-low.gif
Mean = 32768.41, sigma = 0.62, input = 5.12 V
Figure 6-19 DC Histogram for Mid-Scale Inputs (0 V–10.24 V)
GUID-7548141B-8CE7-41E2-A2A0-2516082E614A-low.gif
Mean = 32768.32, sigma = 0.78, input = 2.56 V
Figure 6-21 DC Histogram for Mid-Scale Inputs (0 V–5.12 V)
GUID-91FA030D-A549-4A1B-AFB4-A1CFE584DFB8-low.gif
All input ranges
Figure 6-23 DNL vs Temperature
GUID-7F600762-F0B8-4E2D-83CE-FBDCE7FE8775-low.gif
 
Figure 6-25 Typical INL for All Codes (All Unipolar Ranges)
GUID-78F30AF3-4177-42FD-B6F0-2F6D83B9955B-low.gif
 
Figure 6-27 INL vs Temperature (All Unipolar Ranges)
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Figure 6-29 Typical Histogram for Offset Drift
GUID-A1159B78-3ADE-405C-8BFA-A77335EAB5D8-low.gif
 
Figure 6-31 Typical Histogram for Gain Error Drift
GUID-282A90C0-1219-44C9-B22F-4B88F6E29AD8-low.gif
Number of points = 64k, fIN = 1 kHz
Figure 6-33 Typical FFT Plot (All Ranges) for the ADS8681
GUID-384390B4-04C6-450D-A98A-61CF611AB366-low.gif
Number of points = 64k, fIN = 1 kHz
Figure 6-35 Typical FFT Plot (All Ranges) for the ADS8689
GUID-D17DC37E-44F9-45F0-B387-426DFFD92123-low.gif
fIN = 1 kHz
Figure 6-37 SNR vs Temperature
GUID-04B75476-6DAA-4B20-9C39-0A14893DB0EC-low.gif
fIN = 1 kHz
Figure 6-39 SINAD vs Temperature
GUID-AA681B4D-1560-4CBB-82BA-B89F770BC741-low.gif
fIN = 1 kHz
Figure 6-41 THD vs Temperature
GUID-554ECC10-A945-4148-A0FE-01EA4FC1635B-low.gif
 
Figure 6-43 AVDD Current vs Throughput
GUID-DAFD0BD3-C57B-4187-8EBF-D613F1D93CDC-low.gif
 
Figure 6-45 AVDD Current vs Temperature (Standby Mode)
GUID-F1365E9E-6A68-4E5D-BD30-21DA5B954031-low.gif
Range = ±12.288 V
Figure 6-10 Input I-V Characteristic Across Temperature
GUID-BD8889AE-CA2F-4B20-88AA-CCE3A8E808DE-low.gif
Number of samples = 3398
Figure 6-12 Typical Distribution of Input Impedance
GUID-7CBA3A20-8992-4515-A4CA-CD28BD77B032-low.gif
Mean = 32767.24, sigma = 0.56, input = 0 V
Figure 6-14 DC Histogram for Mid-Scale Inputs (±10.24 V)
GUID-CB5C45B3-E06A-4312-8B8E-519F92D4D0B2-low.gif
Mean = 32768.11, sigma = 0.62, input = 0 V
Figure 6-16 DC Histogram for Mid-Scale Inputs (±5.12 V)
GUID-9060C8FE-03CD-4C43-9CE1-8695DB77B1F6-low.gif
Mean = 32767.73, sigma = 0.60, input = 6.144 V
Figure 6-18 DC Histogram for Mid-Scale Inputs (0 V–12.288 V)
GUID-2542990B-3667-4147-A6D9-9D9BD7D9AAAA-low.gif
Mean = 32768.42, sigma = 0.76, input = 3.072 V
Figure 6-20 DC Histogram for Mid-Scale Inputs (0 V–6.144 V)
GUID-26ECF910-4E2F-47A9-8D5D-A412249B1641-low.gif
All input ranges
Figure 6-22 Typical DNL for All Codes
GUID-D6BFF53C-E91C-44AB-9BCB-9C7D32CA3558-low.gif
 
Figure 6-24 Typical INL for All Codes (All Bipolar Ranges)
GUID-7AE4DF2F-3207-44A2-933F-3985A98C703E-low.gif
 
Figure 6-26 INL vs Temperature (All Bipolar Ranges)
GUID-D7531B03-D790-4452-883C-348A136ADB00-low.gif
 
Figure 6-28 Offset Error vs Temperature Across Input Ranges
GUID-C89C2002-9379-4DB6-BD8A-E84D6222E926-low.gif
 
Figure 6-30 Gain Error vs Temperature Across Input Ranges
GUID-0652E860-28CD-4871-ABB8-938993305F78-low.gif
 
Figure 6-32 Gain Error vs External Resistance (REXT)
GUID-E26D7F45-830C-447E-8A46-51EAE04143DE-low.gif
Number of points = 64k, fIN = 1 kHz
Figure 6-34 Typical FFT Plot (All Ranges) for the ADS8685
GUID-81966AF3-C68F-4136-A6ED-95DD85C6A20B-low.gif
 
Figure 6-36 SNR vs Input Frequency
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Figure 6-38 SINAD vs Input Frequency
GUID-42710955-E53C-49AA-8CC2-12D1684D07C7-low.gif
 
Figure 6-40 THD vs Input Frequency
GUID-C3A4BFDC-96FA-4DF1-ACA8-32F16CEB5B71-low.gif
 
Figure 6-42 AVDD Current vs Temperature
GUID-EB641500-7161-48A7-9BED-63DA6EC1C719-low.gif
 
Figure 6-44 AVDD Current vs Temperature (During Sampling)
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Figure 6-46 AVDD Current vs Temperature (Power-Down Mode)