LTC6902 Multiphase Oscillator with Spread Spectrum Frequency Modulation

The LTC™6902 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 LTC6902µs master oscillator is controlled by the RSET resistor 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 LTC6902µs 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

产品特点 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
100 Ohm CMOS Output Driver
Operates from a Single 2.7V to 5.5V Supply
Available in 10-Lead MS Package

参数

应用

Switching Power Supply Clock Reference
Portable and Battery-Powered Equipment
PDAs
Cell Phones
Clocking Switched Capacitor Filters

典型应用图

LTC6902 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC6902CMS	MSOP	10	C	$2.90	$2.20
LTC6902CMS#PBF	MSOP	10	C	$2.90	$2.20
LTC6902CMS#TR	MSOP	10	C		$2.25
LTC6902CMS#TRPBF	MSOP	10	C		$2.25
LTC6902IMS	MSOP	10	I	$3.63	$2.75
LTC6902IMS#PBF	MSOP	10	I	$3.63	$2.75
LTC6902IMS#TR	MSOP	10	I		$2.80
LTC6902IMS#TRPBF	MSOP	10	I		$2.80

LTC6902 数据手册及相关资料下载

数据手册 (英文) : LTC6902 - Multiphase Oscillator with Spread Spectrum Frequency Modulation.PDF
应用指南 (英文) : AN119A - Powering Complex FPGA-Based Systems Using Highly Integrated DC/DC uModule Regulator Systems.PDF
应用指南 (英文) : AN93 - Instrumentation Applications for a Monolithic Oscillator: A Clock for All Reasons.PDF
设计要点 (中文) : DN411 - 简单且紧凑的四输出负载点 DC/DC uModule 系统.PDF
可靠性数据 : R426 Reliability Data .PDF
产品选型卡 : Silicon Oscillators.PDF