DAC161S997 Datasheet, PDF (1/27 Pages) Texas Instruments – 16-bit SPI Programmable DAC for 4-20mA Loops

DAC161S997
www.ti.com
16-bit SPI Programmable DAC for 4-20mA Loops
Check for Samples: DAC161S997
SNAS621 – JUNE 2013
FEATURES
1
•2 16-bit Resolution
• Very Low Supply Current of 100 µA
• 5 ppmFS/°C Gain Error
• Pin-Programmable Power-Up Condition
• Loop-Error Detection and Reporting
• Programmable Output-Current Error Levels
• Simple HART Modulator Interfacing
• Highly Integrated Feature Set in Small
Footprint WQFN-16 (4 × 4 mm, 0.5 mm Pitch)
APPLICATIONS
• Two-Wire 4-20mA Current-Loop Transmitter
• Loop-Power Transmitters
• Industrial Process Control
• Actuator Control
DESCRIPTION
The DAC161S997 is a very low power 16-bit ΣΔ
digital-to-analog converter (DAC) for transmitting an
analog output current over an industry standard 4-
20mA current loop. The DAC161S997 has a simple
4-wire SPI for data transfer and configuration of the
DAC functions. To reduce power and component
count in compact loop-powered applications, the
DAC161S997 contains an internal ultra-low power
voltage reference and an internal oscillator. The low
power consumption of the DAC161S997 results in
additional current being available for the remaining
portion of the system. The loop drive of the
DAC161S997 interfaces to a Highway Addressable
Remote Transducer (HART) modulator, allowing
injection of FSK modulated digital data into the 4-
20mA current loop. This combination of specifications
and features makes the DAC161S997 ideal for 2- and
4-wire industrial transmitters. The DAC161S997 is
available in a 16-pin 4 mm × 4 mm WQFN package
and is specified over the extended industrial
temperature range of –40°C to +105°C.
LDO
LOOP+
SCLK
CSB
SDI
SDO
VD
ERRB
VD
VA
Internal
Reference
4-20 mA
Loop
ÐÂ DAC
+
16
I_DAC
-
BASE
COMD
80k
DAC161S997
NC C1 C2 C3
COMA
40
OUT
ERRLVL
LOOP-
HART
Modulator
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated