LTC6902IMS#PBF

Programmable Timers And Oscillators Overview

The LTC6902IMS#PBF is a precision, low-power silicon oscillator from Analog Devices Inc. housed in a 10-lead MSOP package. It provides multiphase outputs (2-, 3-, or 4-phase) with an optional spread spectrum frequency modulation (SSFM) capability to improve electromagnetic compatibility. The oscillator frequency is set by a single external resistor (RSET), covering a range of 5kHz to 20MHz. Key electrical parameters include a supply voltage range of 2.7V to 5.5V, typical supply current of 400mA at 3V and 1MHz, and frequency accuracy within ±1.5% max for 5kHz to 10MHz at 25°C. The device features fast start-up times ranging from 50ms to 1.5ms and CMOS output drivers.

Programmable Timers And Oscillators Feature Summary

• Multiphase Outputs: Generates 2-, 3-, or 4-phase clock signals via programmable divider and phase settings.
• Spread Spectrum Frequency Modulation (SSFM): Optional SSFM reduces peak EMI using a pseudorandom noise signal, controlled by an external RMOD resistor.
• Single Resistor Frequency Setting: Output frequency is determined by one external resistor (RSET), simplifying design.
• Wide Frequency Range: Supports frequencies from 5kHz to 20MHz with high accuracy (±1.5% max error at 25°C).

Programmable Timers And Oscillators Applications

• Switching power supply clock references
• Portable and battery-powered equipment
• PDAs and cell phones
• Clocking switched capacitor filters

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS variant corresponds to the industrial temperature range (-40°C to +85°C). Ensure the ordering code matches the exact pinout and package dimensions required for the PCB footprint. Cross-reference the manufacturer's latest datasheet for any potential product change notifications affecting this part number.

Programmable Timers And Oscillators Selection Notes

Select the LTC6902IMS#PBF when multiphase outputs are required without external logic. Choose the 'I' grade for guaranteed performance across the full -40°C to +85°C temperature range. Use the N=1, 10, or 100 divider settings to extend the frequency range beyond the master oscillator's limits. Enable SSFM only if EMC improvement is necessary, as it requires an additional RMOD resistor and increases supply current slightly.

Programmable Timers And Oscillators Part Context

The LTC6902 is part of Analog Devices' family of precision oscillators designed for compact, low-power applications. Unlike standard crystal oscillators, it offers configurable multiphase outputs and spread spectrum modulation in a small MSOP package. This integration reduces component count and board space compared to discrete solutions combining an oscillator with phase generators.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements must support multiphase outputs and similar frequency ranges. Verify that substitute components offer comparable SSFM capabilities if EMI reduction is critical. Check for identical pinouts and supply voltage requirements to ensure compatibility with existing circuit designs without schematic modifications.