LTC6905MPS5#TRMPBF

Programmable Timers And Oscillators Overview

The LTC6905MPS5#TRMPBF is a precision, programmable silicon oscillator manufactured by Analog Devices Inc. It generates output frequencies from 17MHz to 170MHz using a single external resistor (RSET) connected between the SET and V+ pins. The device operates on a single supply voltage ranging from 2.7V to 5.5V and provides a rail-to-rail CMOS square wave output with a typical duty cycle of 50%. An internal three-state divider allows frequency division by 1, 2, or 4 via the DIV pin. The component is housed in a low-profile 5-lead TSOT-23 package and supports an operating temperature range of –55°C to 125°C.

Programmable Timers And Oscillators Feature Summary

• Frequency Range: 17MHz to 170MHz set by a single resistor (10kΩ to 25kΩ).
• Temperature Grade: Extended industrial/military grade (-55°C to 125°C).
• Supply Voltage: Operates from 2.7V to 5.5V single supply.
• Output Driver: CMOS output capable of driving 500Ω loads at 3V.

Programmable Timers And Oscillators Applications

• High-frequency precision clock generation.
• Replacement for fixed crystal oscillators.
• Replacement for ceramic resonators/oscillators.
• Clocking for high-speed data buses.

Programmable Timers And Oscillators Procurement Notes

Verify the ordering suffix #TRMPBF indicates a Tape and Reel (Mini) packaging format containing 500 pieces. Confirm the MPS5 suffix corresponds to the –55°C to 125°C temperature range. Ensure the lead-free finish matches project requirements. Cross-reference the part marking LTDVW with the shipping container label to validate the temperature grade.

Programmable Timers And Oscillators Selection Notes

Select this variant when operation below 0°C or above 85°C is required. Use the standard C or I grades if the environment remains within commercial limits. Calculate RSET using the provided formula f(MHz) = 168.5 / (RSET(kΩ) * N) + 1.5. Account for resistor tolerance as it directly adds to frequency error. Consider the ÷4 divider setting for lower jitter at reduced frequencies.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6905 family of ThinSOT silicon oscillators. The MPS5 suffix specifically designates the military/extended temperature grade version. Other variants include CS5 (commercial), IS5 (industrial), and HS5 (high temperature). Fixed frequency versions are available under the LTC6905-XXX series designation.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements within the same package and function include LTC6905HS5#TRMPBF for high-temperature applications or LTC6905IS5#TRMPBF for industrial ranges. Verify that the substitute part's temperature rating covers the application environment. Check if the specific frequency accuracy requirements match the ±2.5% max specification over the full temperature range.

Programmable Timers And Oscillators FAQ

How is the output frequency divided?

The internal divider can be set to ÷1, ÷2, or ÷4 by controlling the DIV pin (Pin 4). Tie Pin 4 to V+ for ÷1, leave it floating for ÷2, or tie it to GND for ÷4.

What is the typical start-up time?

The typical start-up time and settling time to within 1% of the final frequency is 100μs.

How does power supply noise affect performance?

Power supply noise at frequencies equal to fMO/64 or its multiples can cause additional frequency error. Ripple exceeding 20mV may increase timing jitter.