LTC1329 - Micropower 8-Bit Current Output D/A Converter

Features

  • Precision 10µA ± 2.5% or 50µA ± 2.5% Full Scale DAC Output Current
  • Wide Output Voltage DC Compliance: –17V to 2.5V
  • Wide Supply Range: 2.5V ­ VCC ­ 6.5V
  • Supply Current in Shutdown: 0.2µA
  • Low Supply Current: 55µA for -10 Version, 65µA for -50 Version
  • Available in 8-Pin SO and PDIP
  • Triple ModeTM Interface Modes
  • Can Read Back the 8-Bit DAC Value in SPI Mode
  • DAC Powers Up at Mid-Range

Typical Application

LTC1329 Typical Application

Description

The LTC1329-10/LTC1329-50 are micropower 8-bit current output D/A converters (DACs) with an output range of 0µA to 10µA and 0µA to 50µA for the -10 and -50 versions respectively. In 3.3V or 5V systems, the DAC current output can be biased from –17V to 2V or –17V to 2.5V respectively. The supply current is only 0.2µA in Shutdown. The LTC1329 can communicate with external circuitry by using one of three interface modes: standard SPI mode and two pulse modes. Upon power-up, the internal counter resets to 80H, the DAC output assumes mid-range and the chip is configured to SPI or pulse mode depending on the signal level at CS. In SPI mode, the system MPU can serially transfer 8-bit data to and from the LTC1329. In pulse mode, the upper six bits of the DAC output can be programmed for increment-only (1-wire interface) or increment/decrement (2-wire interface) operation depending on the signal level at DIN. In increment-only operation, when counter increases beyond full scale, the counter rolls over and sets the DAC to zero. In this way, a single pulse applied to CLK increases the upper six bits of the counter by one step and 63 pulses decrease them by one step. In increment/decrement, the counter stops incrementing at full scale and decrementing at zero and will not roll over. LTC1329 is available in 8-pin PDIP and SO packages.

 

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC1329ACS8-50#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1329ACS8-50#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1329CS8-10#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1329CS8-10#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1329CS8-50#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1329CS8-50#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1329IS8-50#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1329IS8-50#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC1329 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC1329ACS8-50#PBF SO-8 C $6.35 $5.10 Yes
LTC1329ACS8-50#TRPBF SO-8 C $5.16 Yes
LTC1329CS8-10#PBF SO-8 C $3.15 $2.55 Yes
LTC1329CS8-10#TRPBF SO-8 C $2.61 Yes
LTC1329CS8-50#PBF SO-8 C $3.15 $2.55 Yes
LTC1329CS8-50#TRPBF SO-8 C $2.61 Yes
LTC1329IS8-50#PBF SO-8 I $3.65 $3.05 Yes
LTC1329IS8-50#TRPBF SO-8 I $3.11 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • LCD Contrast Control
  • Backlight Brightness Control
  • Power Supply Voltage Adjustment
  • Battery Charger Current/Voltage Adjustment
  • GaAs FET Bias Adjustment
  • Trimmer Pot Elimination
  • Low Power and Battery-Operated Systems
  • Handheld or Portable Instruments

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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