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

DAC161P997 (ACTIVE)

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

Recommended alternative parts

  • XTR117  -  4-20mA current loop transmitter
  • DAC7750  -  12 bit DAC with 4-20mA current loop transmitter
  • DAC8750  -  16 bit DAC with 4-20mA current loop transmitter
  • 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 (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.

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 × 4 mm, 0.5 mm Pitch)
  • Key
    • 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)

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

All trademarks are the property of their respective owners.

View more

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

 
Resolution (Bits)
DAC: Channels
Total Unadjusted Error (Max) (%FSR)
INL (Max) (+/-LSB)
Output Range Min. (V or mA)
Output Range Max. (V or mA)
Output Type
Interface
Reference: Type
Rating
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)
Offset Error (Max) (%)
DAC161P997 DAC161S997
16     16    
1     1    
0.23     0.01    
9     9    
0     0    
24     24    
Current     Current    
Single-Wire     Serial SPI    
Ext     Ext    
Catalog     Catalog    
-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    
0.057     0.049    
Click Here
SupplyFrame