LTC6904 - 1kHz - 68MHz Serial Port Programmable Oscillator

Features

  • 1kHz to 68MHz Square Wave Output
  • 0.5% (Typ) Initial Frequency Accuracy
  • Frequency Error <1.1% Over All Settings
  • 10ppm/°C Typical Frequency Drift Over Temperature
  • 0.1% Resolution
  • 1.7mA Typical Supply Current (f < 1MHz, VS = 2.7V)
  • 2.7V to 5.5V Single Supply Operation
  • Jitter <0.4% Typical 1kHz to 8MHz
  • Easy to Use SPI (LTC6903) or I²C (LTC6904) Serial Interface
  • Output Enable Pin
  • –40°C to 125°C Operation
  • MS8 Package

Typical Application

LTC6904
LTC6904
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Description

The LTC6903/LTC6904 are low power self contained digital frequency sources providing a precision frequency from 1kHz to 68MHz, set through a serial port. The LTC6903/LTC6904 require no external components other than a power supply bypass capacitor, and they operate over a single wide supply range of 2.7V to 5.5V.

The LTC6903/LTC6904 feature a proprietary feedback loop that linearizes the relationship between digital control setting and frequency, resulting in a very simple frequency setting equation:

Where OCT is a 4-bit digital code and DAC is a 10-bit digital code.

The LTC6903 is controlled by a convenient SPI compatible serial interface. The LTC6904 uses an industry standard I²C compatible interface.

U.S. Patent Numbers 6342817 and 6614313.

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Packaging

MSOP-8

LTC6904
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC6904CMS8 MSOP 8 C $2.60 $2.10 View
LTC6904CMS8#PBF MSOP 8 C $2.60 $2.10 View
LTC6904CMS8#TR MSOP 8 C   $2.16 View
LTC6904CMS8#TRPBF MSOP 8 C   $2.16 View
LTC6904HMS8 MSOP 8 H $2.99 $2.42 View
LTC6904HMS8#PBF MSOP 8 H $2.99 $2.42 View
LTC6904HMS8#TR MSOP 8 H   $2.48 View
LTC6904HMS8#TRPBF MSOP 8 H   $2.48 View
LTC6904IMS8 MSOP 8 I $2.99 $2.42 View
LTC6904IMS8#PBF MSOP 8 I $2.99 $2.42 View
LTC6904IMS8#TR MSOP 8 I   $2.48 View
LTC6904IMS8#TRPBF MSOP 8 I   $2.48 View
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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.

Evaluation Kits

Part Number Description Price
DC726A-B LTC6904 DEMO BOARD $100.00
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Applications

  • Precision Digitally Controlled Oscillator
  • Power Management
  • Direct Digital Frequency Synthesis (DDS) Replacement
  • Replacement for DAC and VCO
  • Switched Capacitor Filter Clock
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Simulate

OscCalc, an Excel based selection and synthesis tool, allows you to choose and configure the Silicon Oscillator best suited for your application.
  • Download and open OscCalc
  • Enable Macros
  • Enter your desired switching frequency. Suitable silicon oscillators will be highlighted in green. Clicking on a part will show you the external component values and settings required to achieve your desired switching frequency.
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