ADI LTC6904CMS8#PBF

The LTC6903/LTC6904 are low power self contained digital frequency sources providing a precision frequency from 1kHz to 68MHz, set through a serial port. The LTC6903/ LTC6904 require no external components 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: f=2^{0C T}•2078(H z)/(2 - D A C/1024);1k H z<f<68M H z where OCT is a 4-bit digital code and DAC is a 10-bit digital code. The LTC6903 is controlled by a convenient SPI compatible serial interface. The LTC6904 uses an industry standard I2C compatible interface.

• 1kHz to 68MHz Square Wave Output
• 0.5% (Typ) Initial Frequency Accuracy
• Frequency Error < 1.1% Over All Settings
• 10ppm/1°C Typical Frequency Drift Over Temperature
• 0.1% Resolution
• 1.7mA Typical Supply Current (f < 1MHz, V_S = 2.7V)
• 2.7V to 5.5V Single-Supply Operation
• Jitter 1.4% Typical 1kHz to 8MHz
• Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial Interface
• Output Enable Pin
• -55°C to 125°C Operation
• MS8 Package

• Precision Digitally Controlled Oscillator
• Power Management
• Direct Digital Frequency Synthesis (DDS)
• Replacement for DAC and VCO
• Switched Capacitor Filter Clock