LTC6903CMS8#PBF

Programmable Timers And Oscillators Overview

The LTC6903CMS8#PBF 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. It features a proprietary feedback loop that linearizes the relationship between digital control settings and frequency, ensuring high accuracy with a typical initial frequency error of 0.5% and a temperature drift of 10ppm/°C. 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 from 1kHz to 68MHz with 0.1% resolution
• Typical supply current of 1.7mA at frequencies below 1MHz
• Jitter less than 0.4% typical across 1kHz to 8MHz

Programmable Timers And Oscillators Applications

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

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging as per the order information table. Confirm the operating temperature range is 0°C to 70°C for the CMS8 variant. Ensure compatibility with the host microcontroller's SPI voltage levels and timing requirements before integration.

Programmable Timers And Oscillators Selection Notes

Select this model when an SPI interface is preferred over I2C; use the LTC6904 equivalent for I2C compatibility. Consider the 0°C to 70°C commercial temperature grade for standard applications. For wider industrial or automotive temperature ranges, evaluate the IMS8, HMS8, or MPMS8 variants instead.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6903/LTC6904 family of silicon oscillators designed to replace traditional crystal oscillators and discrete frequency synthesis circuits. It simplifies design by integrating the oscillator and divider into a single chip, reducing board space and BOM complexity compared to solutions requiring external resonators.

Programmable Timers And Oscillators Replacement Considerations

Public confirmed substitute part numbers include LTC6903IMS8#PBF for extended temperature operation (-40°C to 85°C) and LTC6903HMS8#PBF for industrial temperature operation (-40°C to 125°C). These parts share identical pinouts and functionality but differ in specified temperature ranges.