LTC6903CMS8#TRPBF

Programmable Timers And Oscillators Overview

The LTC6903CMS8#TRPBF is a low-power, self-contained digital frequency source manufactured by Analog Devices Inc. It provides a precision square wave output ranging from 1kHz to 68MHz, programmable via an SPI-compatible serial interface. The device operates on a single supply voltage between 2.7V and 5.5V and requires no external components other than a power supply bypass capacitor. Key electrical specifications include a typical initial frequency accuracy of 0.5%, a maximum operating frequency of 68MHz, and a typical supply current of 1.7mA at frequencies below 1MHz with a 2.7V supply. The component is housed in an 8-lead plastic MSOP package.

Programmable Timers And Oscillators Feature Summary

• SPI-compatible serial interface for frequency programming
• Frequency range of 1kHz to 68MHz with 0.1% resolution
• Typical initial frequency accuracy of 0.5%
• Single 2.7V to 5.5V supply operation

Programmable Timers And Oscillators Applications

• Precision digitally controlled oscillator
• Replacement for Direct Digital Frequency Synthesis (DDS)
• Switched capacitor filter clock
• Power management timing control

Programmable Timers And Oscillators Procurement Notes

Verify the specific temperature grade associated with the CMS8 suffix against project requirements. The datasheet specifies that the LTC6903CMS8 variant is guaranteed over the 0°C to 70°C range, though it is designed for -40°C to 85°C. Confirm that the tape and reel packaging format aligns with automated assembly capabilities.

Programmable Timers And Oscillators Selection Notes

Select this part when an SPI interface is preferred over I2C. Ensure the application load does not exceed 5pF per output pin without buffering, as higher capacitive loads may degrade accuracy. Verify that the required frequency falls within the linearized range supported by the OCT and DAC codes defined in the datasheet.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6903/LTC6904 family of silicon oscillators. The LTC6903 variant utilizes an SPI interface, whereas the LTC6904 uses an I2C interface. Both share identical electrical characteristics and frequency ranges but differ in their serial communication protocols and address configurations.

Programmable Timers And Oscillators Replacement Considerations

LTC6900CS5#TRPBF: Lower frequency range up to 20MHz.

Programmable Timers And Oscillators FAQ

What is the default output frequency upon power-up?

Upon power-up, all register values reset to zero, resulting in a default output frequency of 1.039kHz.

How is the output frequency calculated?

The frequency is determined by the equation f = 2^OCT * 2078 / (2 - DAC/1024), where OCT is a 4-bit code and DAC is a 10-bit code.

What are the input voltage levels for the serial interface?

The minimum high-level input voltage (VIH) is 0.67 * V+, and the maximum low-level input voltage (VIL) is 0.33 * V+.