Features Guaranteed Monotonicity to 12-bits Low Power Operation: 156 µA max @ 3.3V Extended power supply range (+2.7V to +5.5V) I 2C-Compatible 2-wire Interface which supports standard (100kHz), fast (400kHz), and high speed (3.4MHz) modes Rail-to-Rail Voltage Output Very Small Package 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 TSOT and LLP packages and provides three address options (pin selectable). As an alternative, the DAC121C085 provides nine I 2C 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 MSOP. The DAC121C081 and DAC121C085 use a 2-wire, I 2C-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. 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. 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. Key Specification Resolution 12 bits 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 Normal 380 µW (3V) / 730 µW (5V) typ Power Down 0.5 µW (3V) / 0.9 µW (5V) typ Applications Industrial Process Control Portable Instruments Digital Gain and Offset Adjustment Programmable Voltage & Current Sources Test Equipment

Typical bus configuration

Typical Application click for larger image Typical bus configuration	Block Diagram click for larger image Block Diagram
Typical Performance click for larger image INL vs. Code

Parameters Values Resolution 12 bits Pin and Function Compatible Family None Channels 1 Channels Interface Type I2C Settling Time 8500 ns INL (LSB) +/-8 DNL (LSB) +0.6, -0.5 Power Down, typ. at 3.6V 0.05 uW Oper Pwr typ, 3.6V, 30/0.4MHz SPI/I2C 0.48 mW PowerWise Rating 1 15.94 pJ/conv Reference Source External Max Supply Voltage 5.5 Volt Min Supply Voltage 2.7 Volt Temperature Min -40 deg C Temperature Max 125 deg C OtherSupply Voltage Undefined Data Converter Type DAC PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	DAC121C085 12-Bit Micro Power Digital-to-Analog Converter with an I2C-Compatible Interface and External Reference	689 Kbytes	13-Mar-08	日本語

Application Notes

Title		Size	Date	Other Language
	AN-2001: Application Note 2001 Daisy Chaining Precision DACs	141 Kbytes	25-Sep-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DAC121C085CIMM/NOPB DAC121C085CIMM RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 8000 AVNET-EM Worldwide 1463 DIGI-KEY Worldwide 1408 FARNELL Europe and Asia 13 MOUSER Worldwide 985 NEWARK Americas 423 RS COMPONENTS Worldwide 929 TAYLOR Americas 8000	$1.15 each at 1K+ pcs	reel of 1000
DAC121C085CIMMX/NOPB DAC121C085CIMMX RoHS Status	MINI SOIC	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.15 each at 1K+ pcs	reel of 3500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DAC121C085.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DAC121C085 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DAC121C08XEB/NOPB	12-Bit Micro Power Digital-to-Analog Converter with an I2C-Compatible Interface	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	$112.00 each	1
Description: The DAC121C08XEB Design Kit is designed to ease evaluation and design-in of National Semiconductor`s DAC121C081/DAC121C085 family of Digital-to-Analog Converters. The Micro-Power DACs feature Rail-to-Rail Output and an I2C-Compatible interface. The evaluation board comes with the full-featured MSOP-8 version of the DAC. The evaluation board may be used in the Stand-Alone mode or Computer mode. In Stand-Alone mode, a Pattern Generator is used to interface to the DAC`s I2C Interface. In Computer Mode, a WaveVision4 Board (Rev4.1 or later) is used to drive the DAC`s I2C interface. Features: Guaranteed Monotonicity to 12-bits 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 Rail-to-Rail Voltage Output Very small 6-pin TSOT and LLP Packages Contents: Evaluation Board User`s Guide Datasheet

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
DAC121C085CIMM/NOPB DAC121C085CIMM	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	XTT X90C
DAC121C085CIMMX/NOPB DAC121C085CIMMX	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	XTT X90C

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DAC121C085.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DAC121C085 is located at RoHS Status.

CAD Symbols and Models Download DAC121C085 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
DAC121C085CIMM	CMOS7	0	21301	0	0	1584000	3	449464325
DAC121C085CIMMX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DAC121C085.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DAC121C085 is located at RoHS Status.

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Data Acquisition In Factory Automation Date: 2009-08-24 Length: 0:31:29 Factory Automation Overview Date: 2009-08-04 Length: 0:32:30