DAC161P997 16-bit DAC Datasheet

DAC161P997 Datasheet, PDF, Equivalent


Part Number

DAC161P997

Description

Single-Wire 16-bit DAC

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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DAC161P997
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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.

DAC161P997
DAC161P997
SNAS515G – JULY 2011 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Application ............................................................. 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ............................................... 7
6.7 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
7.5 Programming .......................................................... 12
7.6 Register Maps ........................................................ 18
8 Application and Implementation ........................ 20
8.1 Application Information............................................ 20
8.2 Typical Application ................................................. 26
9 Power Supply Recommendations...................... 30
10 Layout................................................................... 30
10.1 Layout Guidelines ................................................. 30
10.2 Layout Example .................................................... 30
11 Device and Documentation Support ................. 31
11.1 Third-Party Products Disclaimer ........................... 31
11.2 Trademarks ........................................................... 31
11.3 Electrostatic Discharge Caution ............................ 31
11.4 Glossary ................................................................ 31
12 Mechanical, Packaging, and Orderable
Information ........................................................... 31
4 Revision History
Changes from Revision F (January 2013) to Revision G
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
• Changed the second Thead to tbody/row and changed role to hdr in the Timing Requirements table ................................ 7
• Deleted the Related links subsection and checked for setting of single-part ...................................................................... 31
Changes from Revision E (October 2013) to Revision F
Page
• Changed O to Ω in table....................................................................................................................................................... 17
Changes from Revision D (March, 2013) to Revision E
Page
• Changed application circuit .................................................................................................................................................. 26
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Product Folder Links: DAC161P997


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design DAC161P997 SNAS515G – JULY 2011 – REVISED DEC EMBER 2014 DAC161P997 Single-Wire 16-bi t DAC for 4- to 20-mA Loops 1 Features •1 16-Bit Linearity • Single-Wire Interface (SWIF), with Handshake • Di gital Data Transmission (No Loss of Fid elity) • Pin Programmable Power-Up Co ndition • Self Adjusting to Input Dat a Rate • Loop Error Detection and Rre porting • 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 Specifi cations – Output Current TempCo: 29 p pmFS/°C (Max) – Long-Term Output Cur rent Drift: 90 ppmFS (Typ) – INL: 3.3 /−2.1 µA(Max) – Total Supply Curre nt: 190 µA (Max) 2 Application • Two -Wire, 4-20 mA Current Loop Transmitter • Industrial Process Control • Act uator Control • Factory Automation • Building Automation • Precision Instruments • Data Acquisition Systems .
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