SNAS621A JUNE   2013  – December 2014 DAC161S997

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Error Detection And Reporting
        1. 8.3.1.1 Loop Error
        2. 8.3.1.2 SPI Timeout Error (Channel Error)
        3. 8.3.1.3 Frame Error
        4. 8.3.1.4 Alarm Current
    4. 8.4 Device Functional Modes
      1. 8.4.1 Serial Interface
        1. 8.4.1.1 SPI Write
        2. 8.4.1.2 SPI Read
        3. 8.4.1.3 Optional Protected SPI Writes
          1. 8.4.1.3.1 SPI Write Error Correction
    5. 8.5 Register Maps
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 16-bit Dac And Loop Drive
        1. 9.1.1.1 DC Characteristics
        2. 9.1.1.2 DC Input-Output Transfer Function
        3. 9.1.1.3 Loop Interface
        4. 9.1.1.4 Loop Compliance
        5. 9.1.1.5 AC Characteristics
          1. 9.1.1.5.1 Step Response
          2. 9.1.1.5.2 Output Impedance
          3. 9.1.1.5.3 PSRR
          4. 9.1.1.5.4 Stability
          5. 9.1.1.5.5 Noise and Ripple
          6. 9.1.1.5.6 Digital Feedthrough
          7. 9.1.1.5.7 HART Signal Injection
          8. 9.1.1.5.8 RC Filter Limitation
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Reasons for Choosing a 3.9-V Zener Diode
        2. 9.2.2.2 Loop Compliance Voltage
        3. 9.2.2.3 Selection of External BJT
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • 16-Bit Resolution
  • Very-Low Supply Current of 100 µA
  • 5 ppmFS/°C Gain Error
  • Pin-Programmable Power-Up Condition
  • Loop-Error Detection and Reporting
  • Programmable Output-Current Error Levels
  • Simple HART Modulator Interfacing
  • Highly Integrated Feature Set in Small Footprint WQFN-16 (4- × 4-mm, 0.5-mm Pitch)

2 Applications

  • Two-Wire 4- to 20-mA Current-Loop Transmitter
  • Loop-Power Transmitters
  • Industrial Process Control
  • Actuator Control

3 Description

The DAC161S997 is a very low power 16-bit ΣΔ digital-to-analog converter (DAC) for transmitting an analog output current over an industry standard 4-20 mA current loop. The DAC161S997 has a simple 4-wire SPI for data transfer and configuration of the DAC functions. To reduce power and component count in compact loop-powered applications, the DAC161S997 contains an internal ultra-low power voltage reference and an internal oscillator. The low power consumption of the DAC161S997 results in additional current being available for the remaining portion of the system. The loop drive of the DAC161S997 interfaces to a Highway Addressable Remote Transducer (HART) modulator, allowing injection of FSK modulated digital data into the 4-20 mA current loop. This combination of specifications and features makes the DAC161S997 ideal for 2- and 4-wire industrial transmitters. The DAC161S997 is available in a 16-pin 4-mm × 4-mm WQFN package and is specified over the extended industrial temperature range of –40°C to +105°C.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
DAC161S997 WQFN (16) 4.00 mm x 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Simplified Schematic

DAC161S997 simple_typ_app_snas621.gif