SLVSIN3 May   2025 ADS9117 , ADS9118 , ADS9119

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  Thermal Information
    4. 6.4  Recommended Operating Conditions
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements
    7. 6.7  Switching Characteristics
    8. 6.8  Timing Diagrams
    9. 6.9  Typical Characteristics: All Devices
    10. 6.10 Typical Characteristics: ADS9119
    11. 6.11 Typical Characteristics: ADS9118
    12. 6.12 Typical Characteristics: ADS9117
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Inputs
      2. 7.3.2 Analog Input Bandwidth
      3. 7.3.3 ADC Transfer Function
      4. 7.3.4 Reference Voltage
      5. 7.3.5 Temperature Sensor
      6. 7.3.6 Data Averaging
      7. 7.3.7 Digital Down Converter
      8. 7.3.8 Data Interface
        1. 7.3.8.1 Data Frame Width
        2. 7.3.8.2 ADC Output Data Randomizer
        3. 7.3.8.3 Synchronizing Multiple ADCs
        4. 7.3.8.4 Test Patterns for Data Interface
          1. 7.3.8.4.1 Fixed Pattern
          2. 7.3.8.4.2 Alternating Test Pattern
          3. 7.3.8.4.3 Digital Ramp
      9. 7.3.9 ADC Sampling Clock Input
    4. 7.4 Device Functional Modes
      1. 7.4.1 Reset
      2. 7.4.2 Power-Down Options
      3. 7.4.3 Normal Operation
      4. 7.4.4 Initialization Sequence
    5. 7.5 Programming
      1. 7.5.1 Register Write
      2. 7.5.2 Register Read
      3. 7.5.3 Multiple Devices: Daisy-Chain Topology for SPI Configuration
        1. 7.5.3.1 Register Write With Daisy-Chain
        2. 7.5.3.2 Register Read With Daisy-Chain
  9. 8 Register Map
    1. 8.1 Register Bank 0
    2. 8.2 Register Bank 1
    3. 8.3 Register Bank 2
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Data Acquisition (DAQ) Circuit for a ≤20kHz Input Signal Bandwidth
        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 Data Acquisition (DAQ) Circuit for a ≤100kHz Input Signal Bandwidth
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Application Curves
      3. 9.2.3 Data Acquisition (DAQ) Circuit for a ≤1MHz Input Signal Bandwidth
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Application Curves
    3. 9.3 Power Supply Recommendations
    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
    1. 12.1 Mechanical Data

Package Options

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

7.3.8 Data Interface

The ADS911x features a high-speed, serial LVDS data interface with output data frame width to 20 bits or 24 bits with the single-data rate (SDR) and double-data rate (DDR) modes.

Configure the INIT_1 register field before writing to other register fields, as described in Table 7-6 and Table 7-7.

Table 7-6 Register Map Settings for Output Data Interface for the ADS9117
DATA FRAME WIDTH (Bits) DATA RATE INIT_1
0x04[3:0]		 DATA_LANES
0x12[2:0]		 DATA_RATE
0xC1[8]		 CLK1
0xC0[12]		 CLK2
0xC1[0]		 CLK3
0xC5[9]		 CLK4
0xC5[3:2]		 CLK5
0xFB[1]		 CLK6
0x1C[7:6]
20 SDR 0x000B 0 1 0 1 0 3 0 3
20 DDR 0x000B 0 0 0 1 0 3 0 3
24 SDR 0x0000 2 1 0 0 0 0 0 0
24 DDR 0x0000 2 0 0 0 0 0 0 0
Table 7-7 Register Map Settings for Output Data Interface for the ADS9119 and ADS9118
DATA FRAME WIDTH (Bits) DATA RATE INIT_1
0x04[3:0]		 DATA_LANES
0x12[2:0]		 DATA_RATE
0xC1[8]		 CLK1
0xC0[12]		 CLK2
0xC1[0]		 CLK3
0xC5[9]		 CLK4
0xC5[3:2]		 CLK5
0xFB[1]		 CLK6
0x1C[7:6]
20 SDR — Not supported
20 DDR — Not supported
24 SDR — 2 1 0 0 0 0 0 0
24 DDR — 2 0 0 0 0 0 0 0

The ADS911x generates a data clock DCLK that is a multiple of the ADC sampling clock SMPL_CLK. The data clock frequency depends on the data frame width and data rate. The data frame width is 20 or 24 bits and the data rate is SDR or DDR. The following equation calculates the DCLK speed. Table 7-8 lists the possible values for the output data clock frequency.

Equation 4. D C L K   s p e e d =   D a t a   F r a m e   W i d t h   ( 24   b i t   o r   20   b i t ) D a t a   R a t e ( S D R = 1 ,   D D R = 2 )   × S M P L _ C L K
Table 7-8 Data Clock (DCLK) Speed
DATA FRAME WIDTH (Bits) DATA RATE
(1 = SDR, 2 = DDR)		 SMPL_CLK MULTIPLIER DCLK (SMPL_CLK = 5MHz) DCLK (SMPL_CLK = 10MHz) DCLK (SMPL_CLK = 20MHz)
24 1 24 120MHz — —
2 12 60MHz 120MHz 240MHz
20 1 20 100MHz —(1) —(1)
2 10 50MHz —(1) —(1)
(1) A 20-bit data frame width is not supported for the ADS9119 or ADS9118.