LTC6902 Series

Multiphase Oscillator with Spread Spectrum Frequency Modulation

Catalog

Multiphase Oscillator with Spread Spectrum Frequency Modulation

Part	Supplier Device Package	Type	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Supply [Min]	Voltage - Supply [Max]	Package / Case	Package / Case [x]	Package / Case [x]	Mounting Type	Current - Supply	Frequency [Max]	Frequency [Min]
Analog Devices LTC6902IMS#TRPBF	10-MSOP	Oscillator Silicon	85 °C	-40 °C	2.7 V	5.5 V	10-MSOP 10-TFSOP	3 mm	0.118 in	Surface Mount	2.5 mA	20 MHz	100 kHz
Analog Devices LTC6902CMS#TRPBF	10-MSOP	Oscillator Silicon	85 °C	-40 °C	2.7 V	5.5 V	10-MSOP 10-TFSOP	3 mm	0.118 in	Surface Mount	2.5 mA	20 MHz	100 kHz

Catalog

Multiphase Oscillator with Spread Spectrum Frequency Modulation

Key Features

• 2-, 3- or 4-Phase Outputs

• Optional Spread Spectrum Frequency Modulation for Improved EMC Performance

• 5kHz to 20MHz Frequency Range

• One External Resistor Sets the Frequency

• One External Resistor Sets Percent Frequency Spreading

• 400µA Typical Supply Current, VS= 3V, 1MHz

• Frequency Error<1.5% Max, 5kHz to 10MHz (TA= 25°C)

• Frequency Error<2% Max, 5kHz to 10MHz (TA= 0°C to 70°C)

• ±40ppm/°C Temperature Stability

• Fast Start-Up Time: 50µs to 1.5ms

• 100Ω CMOS Output Driver

• Operates from a Single 2.7V to 5.5V Supply

• Available in 10-Lead MS Package

Description

The LTC6902 is a precision, low power and easy-to-use oscillator that provides multiphase outputs in a small package. The oscillator frequency is set by a single external resistor (RSET). The LTC6902 also provides an optional spread spectrum frequency modulation (SSFM) capability that can be activated and controlled by an additional external resistor (RMOD).The LTC6902's master oscillator is controlled by the RSETresistor and has a range of 100kHz and 20MHz. In order to accommodate a wider output frequency range, a programmable divider (divide by 1, 10 or 100) is included. The integrated programmable multiphase circuit provides either 2-, 3- or 4-phase waveforms.The LTC6902's SSFM capability modulates the oscillator's frequency by a pseudorandom noise (PRN) signal to spread the oscillator's energy over a wide frequency band. This spreading decreases the peak electromagnetic radiation level and improves electromagnetic compatibility (EMC) performance. The amount of frequency spreading is programmable by a single additional external resistor (RMOD) and is disabled by grounding the MOD pin.ApplicationsSwitching Power Supply Clock ReferencePortable and Battery-Powered EquipmentPDAsCell PhonesClocking Switched Capacitor Filters