SNAS515G July   2011  – December 2014 DAC161P997

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Application
  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
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Error Detection and Reporting
      2. 7.3.2 Alarm Current
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 Single-Wire Interface (SWIF)
        1. 7.5.1.1 Frame Format
        2. 7.5.1.2 Inter-Frame Period
        3. 7.5.1.3 Symbol Set
        4. 7.5.1.4 Interface Circuit
          1. 7.5.1.4.1 Transformer Coupled Interface - Data Flow to the DAC
          2. 7.5.1.4.2 Transformer Coupled Interface - Acknowledge Pulse
          3. 7.5.1.4.3 DC-Coupled Interface
          4. 7.5.1.4.4 Transformer Selection and SWIF Data Link Circuit Design
    6. 7.6 Register Maps
      1. 7.6.1 LCK
      2. 7.6.2 CONFIG1
      3. 7.6.3 CONFIG2
      4. 7.6.4 CONFIG3
      5. 7.6.5 ERR_LOW
      6. 7.6.6 ERR_HIGH
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 16-BIT DAC and Loop Drive
        1. 8.1.1.1 DC Characteristics
          1. 8.1.1.1.1 DC Input-Output Transfer Function
          2. 8.1.1.1.2 Loop Interface
          3. 8.1.1.1.3 Loop Compliance
        2. 8.1.1.2 AC Characteristics
          1. 8.1.1.2.1 Step Response
          2. 8.1.1.2.2 Output Impedance
          3. 8.1.1.2.3 PSRR
          4. 8.1.1.2.4 Stability
          5. 8.1.1.2.5 Noise and Ripple
          6. 8.1.1.2.6 Digital Feedthrough
          7. 8.1.1.2.7 HART Signal Injection
          8. 8.1.1.2.8 RC Filter Limitation
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Third-Party Products Disclaimer
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • 16-Bit Linearity
  • Single-Wire Interface (SWIF), with Handshake
  • Digital Data Transmission (No Loss of Fidelity)
  • Pin Programmable Power-Up Condition
  • Self Adjusting to Input Data Rate
  • Loop Error Detection and Rreporting
  • Programmable Output Current Error Level
  • No External Precision Components
  • Simple Interface to HART Modulator
  • Small Package: WQFN-16 (4 x 4 mm, 0.5 mm Pitch)
  • Key Specifications
    • Output Current TempCo: 29 ppmFS/°C (Max)
    • Long-Term Output Current Drift: 90 ppmFS (Typ)
    • INL: 3.3/−2.1 µA(Max)
    • Total Supply Current: 190 µA (Max)

2 Application

  • Two-Wire, 4-20 mA Current Loop Transmitter
  • Industrial Process Control
  • Actuator Control
  • Factory Automation
  • Building Automation
  • Precision Instruments
  • Data Acquisition Systems
  • Test Systems

3 Description

The DAC161P997 is a 16-bit ∑Δ digital-to-analog converter (DAC) for transmitting an analog output current over an industry standard 4-20 mA current loop. It offers 16-bit accuracy with a low output current temperature coefficient (29 ppm/°C) and excellent long-term output current drift (90 ppmFS) while consuming less than 190 µA.

The data link to the DAC161P997 is a Single Wire Interface (SWIF) which allows sensor data to be transferred in digital format over an isolation boundary using a single isolation component. The DAC161P997’s digital input is compatible with standard isolation transformers and opto-couplers. Error detection and handshaking features within the SWIF protocol ensure error free communication across the isolation boundary. For applications where isolation is not required, the DAC161P997 interfaces directly to a microcontroller.

The loop drive of the DAC161P997 interfaces to a HART (Highway Addressable Remote Transducer) modulator, allowing injection of FSK modulated digital data into the 4-20 mA current loop. This combination of specifications and features makes the DAC161P997 ideal for 2- and 4-wire industrial transmitters.

The DAC161P997 is available in a 16–lead 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)
DAC161P997 WQFN (16) 4.00 mm x 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

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