LTC1428-50 - Micropower 8-Bit Current Sink Output D/A Converter

Features

  • Precision Full-Scale DAC Output Current at 25°C: 50µA ±3%
  • Wide Output Voltage DC Compliance: 2V to 10V
  • Wide Supply Range: 3V</=VCC</=6.5V
  • Supply Current in Shutdown: 0.2µA
  • Low Supply Current: 130µA
  • Available in 8-Pin SO
  • Triple ModeTM Interface
    1.Standard 3-Wire Mode
    2.1-Wire Pulse Mode Interface: Increment-Only
    3.2-Wire Pulse Mode Interf
  • DAC Value Read Back Capability in 3-Wire Mode
  • DAC Powers Up at Midrange
  • DAC Contents Are Retained in Shutdown

Typical Application

LTC1428-50 Typical Application

Description

The LTC®1428-50 is a micropower 8-bit current sink output D/A converter (DAC) with an output range of 0µA to 50µA. In 3.3V or 5V systems, the DAC IOUT pin can be biased from 2V to 10V. Supply current is only 130µA. Shutdown mode drops the supply current to 0.2µA. The LTC1428-50 communicates with external circuitry by using one of three interface modes: standard 3-wire serial mode or one of two pulse modes. Upon power-up, the internal counter resets to 10000000B, the DAC output assumes midrange and the chip configures to 3-wire or pulse mode depending on the CS signal level. In 3-wire mode, the system MPU can serially transfer 8-bit data to and from the LTC1428-50. In pulse mode, the upper six bits of the DAC output program for increment-only (1-wire interface) or increment/decrement (2-wire interface) operation depending on the DIN signal level. In increment-only mode, the counter rolls over and sets the DAC to zero if the counter increases beyond full scale. In increment/decrement mode, the counter stops incrementing at full scale, stops decrementing at zero scale and does not roll over. LTC1428-50 is available in an 8-pin SO package.

 

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
LTC1428CS8-50#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1428CS8-50#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LTC1428-50 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
LTC1428CS8-50#PBF SO-8 C $3.15 $2.55 Yes
LTC1428CS8-50#TRPBF SO-8 C $2.61 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
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  • Power Supply Voltage Adjustment
  • Battery Charger Voltage/Current Adjustment
  • GaAs FET Bias Adjustment
  • Trimmer Pot Elimination

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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:

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