LTC6909CMS#PBF

Programmable Timers And Oscillators Overview

The LTC6909CMS#PBF is a precision silicon oscillator featuring one to eight synchronized multiphase outputs. It operates on a single 2.7V to 5.5V supply with a typical quiescent current of 400µA. The output frequency is determined by a single external resistor connected between the SET and V+A pins, utilizing the formula fOUT = 20MHz • 10k/(RSET • PH). The device supports spread spectrum frequency modulation (SSFM) with ±10% spreading to improve electromagnetic compatibility. Outputs are configurable for phase separations ranging from 45° to 120°, or can be held low or placed in a high-impedance state.

Programmable Timers And Oscillators Feature Summary

• Generates 1 to 8 synchronized rail-to-rail clock outputs with programmable phase separation.
• Frequency set by a single external resistor; range spans 12.5kHz to 6.67MHz.
• Integrated spread spectrum frequency modulation (SSFM) with selectable rates of fOUT/16, fOUT/32, and fOUT/64.
• Low power consumption with 400µA supply current and fast start-up time.

Programmable Timers And Oscillators Applications

• Providing synchronized clocks to multiple switching power supplies.
• Multiphase clock generation for synchronous buck converters.
• EMI reduction in switching regulator systems via spread spectrum modulation.

Programmable Timers And Oscillators Procurement Notes

Verify that the component matches the Analog Devices Inc. manufacturer identification and the specific model number LTC6909CMS#PBF. Confirm the package type is MSOP-16 and check for RoHS compliance markings on the shipping container. Ensure the temperature grade corresponds to the commercial specification (0°C to 70°C) as indicated by the 'C' suffix.

Programmable Timers And Oscillators Selection Notes

Select this part when a fixed resistor frequency setting is preferred over digital programming. The CMS variant is specified for commercial temperatures (0°C to 70°C); use the IMS version for extended industrial ranges (-40°C to 85°C). Ensure the RSET resistor value keeps the master oscillator frequency within the optimal accuracy range of 500kHz to 10MHz.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6909 family of silicon oscillators designed for multiphase synchronization. It serves as a central timing source for power management applications requiring precise phase alignment across multiple channels. The device replaces discrete crystal oscillators and dividers in complex power distribution networks.

Programmable Timers And Oscillators Replacement Considerations

Public confirmed substitute part numbers: LTC6909IMS#PBF, LTC6909HMS#PBF.