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GND
DACx750
AVDDDVDD-ENDVDD
Watchdog
Timer
Slew Rate
Control
User Calibration
Gain/Offset
Register
DAC Input
Register
Thermal
Alarm
Internal
Reference
SPI Shift Register
Input Control Logic
Control Logic
REFOUT
REFIN HART-IN
LATCH
SCLK
DIN
SDO
CLR
DAC
Pre-
Conditioning
Current
Source
I
ENABLE
ISET-R
I
GAIN
Current Output Stage
IOUT
ALARM
BOOST
R3-SENSE
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Design
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
,
DAC8750
SBAS538B –DECEMBER 2013–REVISED JUNE 2016
DACx750 Single-Channel, 12- and 16-Bit Programmable Current Output
Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications
1
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) 7.80 mm × 4.40 mm
DACx750 VQFN (40) 6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
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