1. Products
  2. Clock and Timing
  3. Clock Generation and Distribution
  4. Signal Generators
  5. AD2S99


Features and Benefits

  • Programmable Sinusoidal Oscillator
  • Synthesized Synchronous Reference Output
  • Programmable Output Frequency Range: 2 kHz–20 kHz
  • “Loss-of-Signal” Indicator
  • 20-Pin PLCC Package
  • Low Cost

Product Details

The AD2S99 programmable sinusoidal oscillator provides sine wave excitation for resolvers and a wide variety of ac transducers.

The AD2S99 also provides a synchronous reference output signal (3 VP-P square wave) that is phase locked to its SIN and COS inputs. In an application, the SIN and COS inputs are connected to the transducer’s secondary windings. The synchronous reference output compensates for temperature and cabling dependent phase shifts and eliminates the need for external preset phase compensation circuits. The synchronous reference output can be used as a zero crossing reference for resolver-to-digital converters such as Analog Devices’ AD2S80A, AD2S82A, AD2S83 and AD2S90.

The AD2S99 is packaged in a 20-pin PLCC and operates over –40ºC to +85ºC.


  1. Dynamic Phase Compensation
    The AD2S99 dynamically compensates for any phase variation in a transducer by phase locking its synchronous reference output to the transducer’s secondary windings.
  2. Programmable Excitation Frequency
    The excitation frequency is easily programmed to 2 kHz, 5 kHz, 10 kHz, or 20 kHz by using the frequency select pins. Intermediate frequencies are available by adding an external resistor.
  3. Signal Loss Detection
    The AD2S99 has the ability to detect if both the transducer secondary winding connections become disconnected from its SIN and COS inputs. The “LOS” output pin pulls high when a signal loss is detected.
  4. Integration
    The AD2S99 integrates the transducer excitation, synchronous reference, and loss of signal detection functions into a small, cost effective package.


Excitation Source for:

  • Resolvers
  • Synchros
  • LVDTs
  • RVDTs
  • Pressure Transducers
  • Load Cells
  • AC Bridges

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.

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
AD2S99APZ Material Declaration Reliability Data 20-Lead Flatpack
AD2S99BPZ Material Declaration Reliability Data 20-Lead Flatpack
Wafer Fabrication 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