Features and Benefits

  • Single Supply 3.3V or ±3.3V Operation
  • Software Programmable Features
    • Unipolar/Bipolar Conversions
    • 4 Differential/8 Single-Ended Inputs
    • Variable Data Word Length
    • Power Shutdown
  • Built-In Sample-and-Hold
  • Direct 4-Wire Interface to Most MPU Serial Ports and all MPU Parallel Ports
  • 25kHz Maximum Throughput Rate
  • Available in 20-Lead PDIP and 20-Lead SW Packages

Product Details

The LTC1289 is a 3V data acquisition component which contains a serial I/O successive approximation A/D converter. The device specifications are guaranteed at a supply voltage of 2.7V. It uses LTCMOS switched capacitor technology to perform a 12-bit unipolar, or 11-bit plus sign bipolar A/D conversion. The 8 channel input multiplexer can be configured for either single-ended or differential inputs (or combinations thereof). An on-chip sample and hold is included for all single-ended input channels. When the LTC1289 is idle it can be powered down in applications where low power consumption is desired.

The serial I/O is designed to be compatible with industry standard full duplex serial interfaces. It allows either MSB- or LSB- first data and automatically provides 2’s complement output coding in the bipolar mode. The output data word can be programmed for a length of 8, 12 or 16 bits. This allows easy interface to shift registers and a variety of processors.


  • Minimum Guaranteed Supply Voltage: 2.7V
  • Resolution: 12 Bits
  • Fast Conversion Time: 26µs Max Over Temp
  • Low Supply Currents: 1.0mA

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Product Recommendations

LTC1289 Companion Parts

Recommended µModule Isolator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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