LTC6990 - TimerBlox: Voltage Controlled Silicon Oscillator

Features

  • Fixed-Frequency or Voltage-Controlled Operation
    – Fixed: Single Resistor Programs Frequency with <1.5% Max Error
    – VCO: Two Resistors Set VCO Center Frequency and Tuning Range
  • Frequency Range: 488Hz to 2MHz
  • 2.25V to 5.5V Single Supply Operation
  • 72μA Supply Current at 100kHz
  • 500μs Start-Up Time
  • VCO Bandwidth >300kHz at 1MHz
  • CMOS Logic Output Sources/Sinks 20mA
  • 50% Duty Cycle Square Wave Output
  • Output Enable (Selectable Low or Hi-Z When Disabled)
  • –55°C to 125°C Operating Temperature Range
  • Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN Package
  • Click here to start your design with the LTC6990 Online Design Tool!
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC6990 Typical Application
LTC6990 Typical Application

Description

The LTC®6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox® family of versatile silicon timing devices.

A single resistor, RSET, programs the LTC6990’s internal master oscillator frequency. The output frequency is determined by this master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 128.

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
LTC6990CDCB#PBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC6990CDCB#TRMPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC6990CDCB#TRPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC6990CS6#PBF SOT-23 S6 C 05-08-1636 Yes
LTC6990CS6#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC6990CS6#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC6990HDCB#PBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC6990HDCB#TRMPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC6990HDCB#TRPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC6990HS6#PBF SOT-23 S6 H 05-08-1636 Yes
LTC6990HS6#TRMPBF SOT-23 S6 H 05-08-1636 Yes
LTC6990HS6#TRPBF SOT-23 S6 H 05-08-1636 Yes
LTC6990IDCB#PBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC6990IDCB#TRMPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC6990IDCB#TRPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC6990IS6#PBF SOT-23 S6 I 05-08-1636 Yes
LTC6990IS6#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC6990IS6#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC6990MPS6#PBF SOT-23 S6 MP 05-08-1636 Yes
LTC6990MPS6#TRMPBF SOT-23 S6 MP 05-08-1636 Yes
LTC6990MPS6#TRPBF SOT-23 S6 MP 05-08-1636 Yes


LTC6990 Package Drawing
LTC6990 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
LTC6990CDCB#PBF 2x3 DFN-6 C $2.16 Yes
LTC6990CDCB#TRMPBF 2x3 DFN-6 C $2.16 $1.60 Yes
LTC6990CDCB#TRPBF 2x3 DFN-6 C $2.16 $1.55 Yes
LTC6990CS6#PBF SOT-23 C $2.16 Yes
LTC6990CS6#TRMPBF SOT-23 C $2.16 $1.60 Yes
LTC6990CS6#TRPBF SOT-23 C $2.16 $1.55 Yes
LTC6990HDCB#PBF 2x3 DFN-6 H $3.02 Yes
LTC6990HDCB#TRMPBF 2x3 DFN-6 H $3.02 $2.22 Yes
LTC6990HDCB#TRPBF 2x3 DFN-6 H $3.02 $2.17 Yes
LTC6990HS6#PBF SOT-23 H $3.02 Yes
LTC6990HS6#TRMPBF SOT-23 H $3.02 $2.22 Yes
LTC6990HS6#TRPBF SOT-23 H $3.02 $2.17 Yes
LTC6990IDCB#PBF 2x3 DFN-6 I $2.48 Yes
LTC6990IDCB#TRMPBF 2x3 DFN-6 I $2.48 $1.83 Yes
LTC6990IDCB#TRPBF 2x3 DFN-6 I $2.48 $1.78 Yes
LTC6990IS6#PBF SOT-23 I $2.48 Yes
LTC6990IS6#TRMPBF SOT-23 I $2.48 $1.83 Yes
LTC6990IS6#TRPBF SOT-23 I $2.48 $1.78 Yes
LTC6990MPS6#PBF SOT-23 MP $6.48 Yes
LTC6990MPS6#TRMPBF SOT-23 MP $6.48 $4.70 Yes
LTC6990MPS6#TRPBF SOT-23 MP $6.48 $4.65 Yes
Buy NowRequest Samples
* 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.

Part Number Description Price Documentation
DC1562B-A LTC6990 Demo Board | 1kHz to 10kHz VCO $25.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC6990HS6#PBF SOT-23 H $3.02 Yes
LTC6990HS6#TRMPBF SOT-23 H $3.02 $2.22 Yes
LTC6990HS6#TRPBF SOT-23 H $3.02 $2.17 Yes
LTC6990IS6#PBF SOT-23 I $2.48 Yes
LTC6990IS6#TRMPBF SOT-23 I $2.48 $1.83 Yes
LTC6990IS6#TRPBF SOT-23 I $2.48 $1.78 Yes
LTC6990MPS6#PBF SOT-23 MP $6.48 Yes
LTC6990MPS6#TRMPBF SOT-23 MP $6.48 $4.70 Yes
LTC6990MPS6#TRPBF SOT-23 MP $6.48 $4.65 Yes
Buy NowRequest Samples
* 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.

Applications

  • Low Cost Precision Programmable Oscillator
  • Voltage-Controlled Oscillator
  • High Vibration, High Acceleration Environments
  • Replacement for Fixed Crystal and Ceramic Oscillators
  • Portable and Battery-Powered Equipment

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC6990

LTC6690 Online Design Tool

The LTC6990 Online Design Tool is a synthesis and configuration tool that allows you to:

  • Select the frequency and duty cycle of operation
  • Calculate the required external component values
  • Export to LTspice for simulation

Click here to start your design with the LTC6990 Online Design Tool

TimerBlox Designer (MS Excel)

Use this Excel based tool to speed your designs with the LTC6990, LTC6991, LTC6992, LTC6993, LTC6994 and LTC6995

Click here to download TimerBlox Designer

 

Technical Support