1. Products
  2. A/D Converters (ADC)
  3. Precision A/D Converters
  4. Multiplexed A/D Converters
  5. LTC1291


Features and Benefits

  • Built-In Sample-and-Hold
  • Single Supply 5V Operation
  • Power Shutdown
  • Direct 3- or 4-Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports
  • Two-Channel Analog Multiplexer
  • Analog Inputs Common Mode to Supply Rails
  • 8-Pin DIP Package

Product Details

The LTC1291 is a data acquisition system that contains a serial I/O successive approximation A/D converter. It uses LTCMOS switched capacitor technology to perform a 12-bit unipolar A/D conversion. The input multiplexer can be configured for either single-ended or differential inputs. An on-chip sample-and-hold is included on the “+” input. When the LTC1291 is idle, it can be powered down in applications where low power consumption is desired. An external reference is not required because the LTC1291 takes its reference from the power supply (VCC). All these features are packaged in an 8-pin DIP.

The serial I/O is designed to communicate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing data to be transmitted over three or four wires. Given the accuracy, ease of use and small package size, this device is well suited for digitizing analog signals in remote applications where minimum number of interconnects, small physical size, and low power consumption are important.


  • Resolution: 12 Bits
  • Fast Conversion Time: 12µs Max Over Temp.
  • Low Supply Current:
    • 6.0mA (Typ) Active Mode
    • 10µA (Max) Shutdown Mode

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

LTC1291 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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC1291BCN8#PBF Material Declaration Reliability Data 8-Lead PDIP (Narrow 0.3 Inch)
LTC1291CCN8#PBF Material Declaration Reliability Data 8-Lead PDIP (Narrow 0.3 Inch)
LTC1291DCN8#PBF Material Declaration Reliability Data 8-Lead PDIP (Narrow 0.3 Inch)
Wafer Fabrication Data R107 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



A Sample link will be shown above, next to the part, only for parts that are included in our sample program. Selecting the Sample button will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help