LTC6909CMS#TRPBF

Programmable Timers And Oscillators Overview

The LTC6909CMS#TRPBF is a silicon oscillator from Analog Devices Inc. housed in a 16-lead plastic MSOP package. It provides up to eight synchronized, rail-to-rail CMOS outputs with configurable phase separation ranging from 45° to 120°. The output frequency is determined by a single external resistor (RSET) and the selected phase count (PH), calculated as fOUT = 20MHz • 10k/(RSET • PH). This configuration allows for frequencies between 12.5kHz and 6.67MHz. The device operates on a single supply voltage between 2.7V and 5.5V, drawing a typical supply current of 400µA. It features optional spread spectrum frequency modulation (SSFM) to improve electromagnetic compatibility.

Programmable Timers And Oscillators Feature Summary

• Configurable 1 to 8-phase synchronized CMOS outputs
• Frequency set by one external resistor (12.5kHz to 6.67MHz range)
• Optional spread spectrum modulation (±10% spreading) for EMC improvement
• Low power consumption with 400µA typical supply current

Programmable Timers And Oscillators Applications

• Synchronizing multiple switching power supplies
• Providing multiphase clock signals to integrated modules
• Systems requiring improved electromagnetic compatibility through spread spectrum clocking

Programmable Timers And Oscillators Procurement Notes

Verify that the component matches the specific temperature grade required for the application. The 'C' suffix indicates a commercial operating range of 0°C to 70°C. Ensure the ordering suffix '#TRPBF' corresponds to the tape and reel packaging format needed for assembly processes. Confirm RoHS compliance status via official manufacturer documentation before procurement.

Programmable Timers And Oscillators Selection Notes

Select this part when an application requires multiple synchronized clock phases derived from a single source. The frequency accuracy depends heavily on the precision of the external RSET resistor; values between 20kΩ and 400kΩ are recommended for optimal performance. Consider the MOD pin configuration if spread spectrum modulation is desired, noting that floating the pin selects a specific modulation rate requiring bypass capacitance.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6909 family of silicon oscillators. It serves as a high-phase-count alternative to the LTC6908 series, which offers only two outputs in smaller packages. While the LTC6908 is suitable for simple dual-phase needs, the LTC6909 supports up to eight phases, making it distinct for complex multi-rail synchronization tasks.

Programmable Timers And Oscillators Replacement Considerations

Public confirmed substitute part numbers: None.