DAC161P997_15 Datasheet, PDF (1/39 Pages) Texas Instruments – DAC161P997 Single-Wire 16-bit DAC for 4- to 20-mA Loops

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DAC161P997
SNAS515G – JULY 2011 – REVISED DECEMBER 2014
DAC161P997 Single-Wire 16-bit DAC for 4- to 20-mA Loops
1 Features
•1 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
Industrial 4-20mA Transmitter
LDO
LOOP+
µC
Sensor IN
GPIO
VD
DBACK
XFRMR
DIN
ACKB
ERRLVL
DAC161P997
ÐÂ DAC
16
IDAC
LOW
80k
NC
C1
C2
C3
HART Modulator
VA
ERRB
+
-
40
BASE
COMD
COMA
OUT
COM
Circuit common
return node
0-24 mA Loop
LOOP
SUPPLY
+
-
LOOP-
LOOP
RECEIVER
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.