DAC7750 Converters Datasheet

DAC7750 Datasheet, PDF, Equivalent


Part Number

DAC7750

Description

Digital-to-Analog Converters

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download DAC7750 Datasheet


DAC7750
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DAC7750, DAC8750
SBAS538C – DECEMBER 2013 – REVISED JANUARY 2018
DACx750 Single-Channel, 12- and 16-Bit Programmable Current Output
Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications
1 Features
1 Current Output Options:
– 0 mA to 24 mA
– 4 mA to 20 mA
– 0 mA to 20 mA
• ±0.1% FSR Typical Total Unadjusted Error (TUE)
• DNL: ±1 LSB Maximum
• Max Loop Compliance Voltage: AVDD – 2 V
• Internal 5-V Reference: 10 ppm/°C (Maximum)
• Internal 4.6-V Power-Supply Output
• CRC Frame Error Check
• Watchdog Timer
• Thermal Alarm
• Open Circuit Alarm
• Terminals to Monitor Output Current
• On-Chip Fault Alarm
• User-Calibration for Offset and Gain
• Wide Temperature Range: –40°C to 125°C
• 6-mm × 6-mm 40-Pin VQFN and 24-Pin HTSSOP
Packages
2 Applications
• 4-mA to 20-mA Current Loops
• Analog Output Modules
• Building Automation
• Environment Monitoring
• Programmable Logic Controllers (PLCs)
• Field Sensors and Process Transmitters
3 Description
The DAC7750 and DAC8750 are low-cost, precision,
fully-integrated 12-bit and 16-bit digital-to-analog
converters (DACs) designed to meet the
requirements of industrial process-control
applications. These devices can be programmed as a
current output with a range of 4 mA to 20 mA, 0 mA
to 20 mA, or 0 mA to 24 mA. The DAC7750 and
DAC8750 include reliability features such as CRC
error checking on the serial peripheral interface
(SPI™) frame, a watchdog timer, an open circuit,
compliance voltage, and thermal alarm. In addition,
the output current can be monitored by accessing an
internal precision resistor.
These devices include a power-on-reset function to
ensure that the device powers up in a known state
(IOUT is disabled and in a Hi-Z state). The CLR
terminal sets the current output to the low end of the
range if the output is enabled. Program the zero and
gain registers to digitally calibrate the device in the
end system. The output slew rate is also
programmable by register. These devices can
superimpose an external HART® signal on the current
output, and can operate with a 10-V to 36-V supply.
All versions are available in both 40-pin VQFN and
24-pin TSSOP packages.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DACx750
HTSSOP (24)
VQFN (40)
7.80 mm × 4.40 mm
6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
DVDD DVDD-EN
DACx750
Internal
Reference
Block Diagram
REFOUT
REFIN
HART-IN
AVDD
LATCH
SCLK
DIN
SDO
CLR
DAC Input
Register
Thermal
Alarm
User Calibration
Gain/Offset
Register
Slew Rate
Control
DAC
Current Output Stage
Pre-
Conditioning
IGAIN
Current
Source
IENABLE
R3-SENSE
BOOST
IOUT
ALARM
ISET-R
Watchdog
Timer
GND
Copyright © 2016, Texas Instruments Incorporated
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.

DAC7750
DAC7750, DAC8750
SBAS538C – DECEMBER 2013 – REVISED JANUARY 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 6
7.6 Electrical Characteristics: AC.................................... 9
7.7 Timing Requirements: Write Mode ........................... 9
7.8 Timing Requirements: Readback Mode.................... 9
7.9 Timing Requirements: Daisy-Chain Mode .............. 10
7.10 Typical Characteristics .......................................... 12
8 Detailed Description ............................................ 20
8.1 Overview ................................................................. 20
8.2 Functional Block Diagram ....................................... 20
8.3 Feature Description................................................. 21
8.4 Device Functional Modes........................................ 29
8.5 Programming........................................................... 31
8.6 Register Maps ......................................................... 34
9 Application and Implementation ........................ 37
9.1 Application Information............................................ 37
9.2 Typical Application .................................................. 39
10 Power Supply Recommendations ..................... 41
11 Layout................................................................... 42
11.1 Layout Guidelines ................................................. 42
11.2 Layout Example .................................................... 42
11.3 Thermal Considerations ........................................ 43
12 Device and Documentation Support ................. 44
12.1 Documentation Support ........................................ 44
12.2 Related Links ........................................................ 44
12.3 Receiving Notification of Documentation Updates 44
12.4 Community Resources.......................................... 44
12.5 Trademarks ........................................................... 44
12.6 Electrostatic Discharge Caution ............................ 44
12.7 Glossary ................................................................ 44
13 Mechanical, Packaging, and Orderable
Information ........................................................... 45
4 Revision History
Changes from Revision B (June 2016) to Revision C
Page
• Changed description of Power-Supply Sequence section ................................................................................................... 22
• Added The DACx750 Shares the SPI Bus With Other Devices section .............................................................................. 24
• Added first sentence to second paragraph and added last paragraph to Frame Error Checking section ........................... 25
• Added The DACx750 Shares the SPI Bus With Other Devices section .............................................................................. 26
• Added last paragraph to User Calibration section................................................................................................................ 27
• Added last paragraph to Programmable Slew Rate section................................................................................................. 29
Changes from Revision A (March 2012) to Revision B
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
• Added I/O column to Pin Functions table ............................................................................................................................... 4
• Moved Thermal Considerations from Power Supply Recommendations to Layout ............................................................ 43
Changes from Original (December 2013) to Revision A
Page
• Changed format to meet latest data sheet standards; added new sections and moved existing sections ........................... 1
• Changed data sheet from 1-page product preview to full production data ............................................................................ 1
• Updated Layout Schematic .................................................................................................................................................. 42
2 Submit Documentation Feedback
Copyright © 2013–2018, Texas Instruments Incorporated
Product Folder Links: DAC7750 DAC8750


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design DAC7750, DAC8 750 SBAS538C – DECEMBER 2013 – REVI SED JANUARY 2018 DACx750 Single-Channel , 12- and 16-Bit Programmable Current O utput Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications 1 Features •1 Current Output Option s: – 0 mA to 24 mA – 4 mA to 20 mA – 0 mA to 20 mA • ±0.1% FSR Typica l Total Unadjusted Error (TUE) • DNL: ±1 LSB Maximum • Max Loop Complianc e Voltage: AVDD – 2 V • Internal 5- V Reference: 10 ppm/°C (Maximum) • I nternal 4.6-V Power-Supply Output • C RC Frame Error Check • Watchdog Timer • Thermal Alarm • Open Circuit Ala rm • Terminals to Monitor Output Curr ent • On-Chip Fault Alarm • User-Ca libration for Offset and Gain • Wide Temperature Range: –40°C to 125°C 6-mm × 6-mm 40-Pin VQFN and 24-Pin HTSSOP Packages 2 Applications • 4-mA to 20-mA Current Loops • Analog Output Modules • Building Automation • Environment Monitoring • Programmable Logic.
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