DAC161S997_15 Datasheet, PDF (1/39 Pages) Texas Instruments – DAC161S997 16-Bit SPI-Programmable DAC for 4-20 mA Loops

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DAC161S997
SNAS621A – JUNE 2013 – REVISED DECEMBER 2014
DAC161S997 16-Bit SPI-Programmable DAC for 4-20 mA Loops
1 Features
•1 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)
2 Applications
• Two-Wire 4- to 20-mA Current-Loop Transmitter
• Loop-Power Transmitters
• Industrial Process Control
• Actuator Control
3 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 4-20
mA 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 4-20
mA 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DAC161S997
WQFN (16)
4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
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
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.