Single-Wire 16-bit DAC for 4-20mA Loops - DAC161P997

DAC161P997 (ACTIVE)

Single-Wire 16-bit DAC for 4-20mA Loops

Recommended alternative parts

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  • DAC7760  -  12 bit DAC with 4-20mA current loop transmitter and voltage output
  • DAC8760  -  16 bit DAC with 4-20mA current loop transmitter and voltage output

Description

The DAC161P997 is a 16- bit ΣΔ 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 (29ppm/°C) and excellent long-term output current drift (90 ppmFS) while consuming less than 190µA.

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 optocouplers. 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 4-20mA 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.

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
    Reporting
  • Programmable Output Current Error Level
  • No External Precision Components
  • Simple Interface to HART Modulator
  • Small Package: WQFN-16 (4x4 mm, 0.5 mm
    Pitch)

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

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)

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Parametrics Compare all products in Precision DAC with 4 to 20mA current output

 
Resolution (Bits)
DAC: Channels
INL (Max) (+/-LSB)
Output Range Max. (V or mA)
Output Type
Interface
Reference: Type
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
Analog Supply (Min) (V)
Analog Supply (Max) (V)
DNL (Max) (+/-LSB)
Digital Supply (Min) (V)
Digital Supply (Max) (V)
Gain Error (Max) (%FSR)
Architecture
Power Consumption (Typ) (mW)
DAC161P997 DAC161S997
16     16    
1     1    
9     9    
24     24    
Current     Current    
Single-Wire     Serial SPI    
Ext     Ext    
-40 to 105     -40 to 105    
16WQFN     16WQFN    
1.75 | 1ku     1.75 | 1ku    
2.7     2.7    
3.6     3.6    
0.5     0.5    
2.7     2.7    
3.6     3.6    
0.22     0.22    
Delta-Sigma     Delta-Sigma    
0.5     0.33    

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