SBAS943A September   2018  – August 2019 ADS1284

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 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 Inputs and Multiplexer
      2. 8.3.2 Programmable Gain Amplifier (PGA)
      3. 8.3.3 Analog-to-Digital Converter (ADC)
        1. 8.3.3.1 Modulator
          1. 8.3.3.1.1 Modulator Overrange
          2. 8.3.3.1.2 Modulator Input Impedance
          3. 8.3.3.1.3 Modulator Overrange Detection (MFLAG)
          4. 8.3.3.1.4 Offset
          5. 8.3.3.1.5 Voltage Reference Inputs (VREFP, VREFN)
        2. 8.3.3.2 Digital Filter
          1. 8.3.3.2.1 Sinc Filter Section (sinx / x)
          2. 8.3.3.2.2 FIR Section
          3. 8.3.3.2.3 Group Delay and Step Response
            1. 8.3.3.2.3.1 Linear Phase Response
            2. 8.3.3.2.3.2 Minimum Phase Response
          4. 8.3.3.2.4 HPF Section
    4. 8.4 Device Functional Modes
      1. 8.4.1  Synchronization (SYNC PIN and SYNC Command)
        1. 8.4.1.1 Pulse-Sync Mode
        2. 8.4.1.2 Continuous-Sync Mode
      2. 8.4.2  Reset (RESET Pin and Reset Command)
      3. 8.4.3  Master Clock Input (CLK)
      4. 8.4.4  Power-Down (PWDN Pin and STANDBY Command)
      5. 8.4.5  Power-On Sequence
      6. 8.4.6  DVDD Power Supply
      7. 8.4.7  Serial Interface
        1. 8.4.7.1 Chip Select (CS)
        2. 8.4.7.2 Serial Clock (SCLK)
        3. 8.4.7.3 Data Input (DIN)
        4. 8.4.7.4 Data Output (DOUT)
        5. 8.4.7.5 Serial Port Auto Timeout
        6. 8.4.7.6 Data Ready (DRDY)
      8. 8.4.8  Data Format
      9. 8.4.9  Reading Data
        1. 8.4.9.1 Read-Data-Continuous Mode
        2. 8.4.9.2 Read-Data-By-Command Mode
      10. 8.4.10 One-Shot Operation
      11. 8.4.11 Offset and Full-Scale Calibration Registers
        1. 8.4.11.1 OFC[2:0] Registers
        2. 8.4.11.2 FSC[2:0] Registers
      12. 8.4.12 Calibration Commands (OFSCAL and GANCAL)
        1. 8.4.12.1 OFSCAL Command
        2. 8.4.12.2 GANCAL Command
      13. 8.4.13 User Calibration
    5. 8.5 Programming
      1. 8.5.1 Commands
        1. 8.5.1.1  SDATAC Requirements
        2. 8.5.1.2  WAKEUP: Wake-Up From Standby Mode
        3. 8.5.1.3  STANDBY: Standby Mode
        4. 8.5.1.4  SYNC: Synchronize the Analog-to-Digital Conversion
        5. 8.5.1.5  RESET: Reset the Device
        6. 8.5.1.6  RDATAC: Read Data Continuous
        7. 8.5.1.7  SDATAC: Stop Read Data Continuous
        8. 8.5.1.8  RDATA: Read Data by Command
        9. 8.5.1.9  RREG: Read Register Data
        10. 8.5.1.10 WREG: Write to Register
        11. 8.5.1.11 OFSCAL: Offset Calibration
        12. 8.5.1.12 GANCAL: Gain Calibration
    6. 8.6 Register Maps
      1. 8.6.1 Register Descriptions
        1. 8.6.1.1 ID_CFG: ID_Configuration Register (address = 00h) [reset =x0h]
        2. 8.6.1.2 CONFIG0: Configuration Register 0 (address = 01h) [reset = 52h]
        3. 8.6.1.3 CONFIG1: Configuration Register 1 (address = 02h) [reset = 08h]
        4. 8.6.1.4 HPF0 and HPF1 Registers
          1. 8.6.1.4.1 HPF0: High-Pass Filter Corner Frequency, Low Byte (address = 03h) [reset = 32h]
          2. 8.6.1.4.2 HPF1: High-Pass Filter Corner Frequency, High Byte (address = 04h) [reset = 03h]
        5. 8.6.1.5 OFC0, OFC1, OFC2 Registers
          1. 8.6.1.5.1 OFC0: Offset Calibration, Low Byte (address = 05h) [reset = 00h]
          2. 8.6.1.5.2 OFC1: Offset Calibration, Mid Byte (address = 06h) [reset = 00h]
          3. 8.6.1.5.3 OFC2: Offset Calibration, High Byte (address = 07h) [reset = 00h]
        6. 8.6.1.6 FSC0, FSC1, FSC2 Registers
          1. 8.6.1.6.1 FSC0: Full-Scale Calibration, Low Byte (address = 08h) [reset = 00h]
          2. 8.6.1.6.2 FSC1: Full-Scale Calibration, Mid Byte (address = 09h) [reset = 00h]
          3. 8.6.1.6.3 FSC2: Full-Scale Calibration, High Byte (address = 0Ah) [reset = 40h]
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Geophone Interface
      2. 9.2.2 Digital Interface
    3. 9.3 Initialization Set Up
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Community Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.4 Power-Down (PWDN Pin and STANDBY Command)

Power-down the ADS1284 in two ways: take the PWDN pin low, or send a STANDBY command. When the PWDN pin is pulled low, the internal circuitry is disabled to minimize power and the contents of the register settings are reset.

When in the power-down state, the device outputs remain active and the device inputs must not float. When the STANDBY command is sent, the SPI port and the configuration registers are kept active. Figure 56 and Table 17 show the timing. Standby mode is cancelled when CS is taken high.

ADS1284 ai_tim_pwdn_bas418.gifFigure 56. PWDN Pin and Wake-Up Command Timing
(Table 17 shows tDR)

Table 17. Power-On, PWDN Pin, and Wake-Up Command Timing for New Data

PARAMETER FILTER MODE
tDR Time for data ready 216 CLK cycles after power-on;
and new data ready after PWDN pin or WAKEUP command		 See Table 15 SINC(1)
62.98046875 / fDATA + 468 / fCLK(2) FIR
(1) Supply power-on and PWDN pin default is 1000 SPS FIR.
(2) Subtract two CLK cycles for the WAKEUP command. The WAKEUP command is timed from the next rising edge of CLK to after the eighth rising edge of SCLK during command to DRDY falling.