LTC6904 Datasheet | Linear Technology

( Data Sheet : .. ) LTC6903/LTC6904 1k Hz - 68MHz Serial Port Programmable Oscillator Features s s s s DESCRIPTIO s s s s s s s s 1k Hz to 68MHz Square Wave Output 0.5% (Typ) Initial Frequency Accuracy Frequency Error <1.1% Over All Settings 10ppm/°C Typical Frequency Drift Over Temperature 0.1% Resolution 1.7m A Typical Supply Current (f < 1MHz, VS = 2.7V) 2.7V to 5.5V Single Supply Operation Jitter <0.4% Typical 1k Hz to 8MHz Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial Interface Output Enable Pin - 40°C to 125°C Operation MS8 Package The LTC®6903/LTC6904 are low power self contained digital frequency sources providing a precision frequency from 1k Hz to 68MHz, set through a serial port. The LTC6903/LTC6904 require no external ponents other than a power supply bypass capacitor, and they operate over a single wide supply range of 2.7V to 5.5V. The LTC6903/LTC6904 feature a proprietary feedback loop that linearizes the relationship between digital control setting and frequency, resulting in a very simple frequency setting equation: 2078(Hz) f = 2OCT - ;1k Hz < f < 68MHz DAC   2 -   1024  Where OCT is a 4-bit digital code and DAC is a 10-bit digital code. The LTC6903 is controlled by a convenient SPI patible serial interface. The LTC6904 uses an industry standard I2C patible interface. , LTC and LT are registered trademarks of Linear Technology Corporation. U.S. Patent Numbers 6342817 and 6614313. U APPLICATIO S s s s s s Precision Digitally Controlled Oscillator Power Management Direct Digital Frequency Synthesis (DDS) Replacement Replacement for DAC and VCO Switched Capacitor Filter Clock TYPICAL APPLICATIO A Microcontroller Controlling Its Clock 40 5V MICROCONTROLLER OSC1/CLKIN OSC2/CLKOUT MCLR/VP- P RC5/SDO RC3/SCK/SCL RC2/CCP1 GND SDI LTC6903 SCK SEN CLK 1µF CLK 0.01µF PIC16F73 POWER-UP CLOCK FREQUENCY IS 1039Hz 0 - 1.0 10 V+ OE 10Ω VS = 3V TA = 25°C f = 1039Hz 443 30 UNITS TESTED 10k UNITS 5V 0.1µF VDD VSS...