DAC121C081, DAC121C085
www.ti.com
SNAS395D –DECEMBER 2007–REVISED MARCH 2013
DAC121C081/ DAC121C085 12-Bit Micro Power Digital-to-Analog Converter with an I2C-
Compatible Interface
Check for Samples: DAC121C081, DAC121C085
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FEATURES
DESCRIPTION
The DAC121C081 is a 12-bit, single channel, voltage-
output digital-to-analog converter (DAC) that operates
from a +2.7V to 5.5V supply. The output amplifier
allows rail-to-rail output swing and has an 8.5µsec
settling time. The DAC121C081 uses the supply
voltage as the reference to provide the widest
dynamic output range and typically consumes 132µA
while operating at 5.0V. It is available in 6-lead SOT
and WSON packages and provides three address
options (pin selectable).
As an alternative, the DAC121C085 provides nine I2C
addressing options and uses an external reference. It
has the same performance and settling time as the
DAC121C081. It is available in an 8-lead VSSOP.
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Guaranteed Monotonicity to 12-Bits
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Low Power Operation: 156 µA Max @ 3.3V
Extended Power Supply Range (+2.7V to
+5.5V)
I2C-Compatible 2-Wire Interface Which
Supports Standard (100kHz), Fast (400kHz),
and High Speed (3.4MHz) Modes
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Rail-to-Rail Voltage Output
Very Small Package
APPLICATIONS
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Industrial Process Control
Portable Instruments
The DAC121C081 and DAC121C085 use a 2-wire,
I2C-compatible serial interface that operates in all
three speed modes, including high speed mode
(3.4MHz). An external address selection pin allows up
to three DAC121C081 or nine DAC121C085 devices
per 2-wire bus. Pin compatible alternatives to the
DAC121C081 are available that provide additional
address options.
Digital Gain and Offset Adjustment
Programmable Voltage & Current Sources
Test Equipment
KEY SPECIFICATIONS
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Resolution: 12 bits
The DAC121C081 and DAC121C085 each have a
16-bit register that controls the mode of operation, the
power-down condition, and the output voltage. A
power-on reset circuit ensures that the DAC output
powers up to zero volts. A power-down feature
reduces power consumption to less than a microWatt.
Their low power consumption and small packages
make these DACs an excellent choice for use in
battery operated equipment. Each DAC operates over
the extended industrial temperature range of −40°C
to +125°C.
INL: ±8 LSB (max)
DNL: +0.6 / -0.5 LSB (max)
Settling Time: 8.5 µs (max)
Zero Code Error: +10 mV (max)
Full-Scale Error: −0.7 %FS (max)
Supply Power
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Normal: 380 µW (3V) / 730 µW (5V) typ
Power Down: 0.5 µW (3V) / 0.9 µW (5V) typ
The DAC121C081 and DAC121C085 are each part of
a family of pin compatible DACs that also provide 8
and 10 bit resolution. For 8-bit DACs see the
DAC081C081 and DAC081C085. For 10-bit DACs
see the DAC101C081 and DAC101C085.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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I2C is a registered trademark of Phillips Corporation..
All other trademarks are the property of their respective owners.
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 © 2007–2013, Texas Instruments Incorporated
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