Datasheet LTC6903, LTC6904 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 1kHz - 68MHz Serial Port Programmable Oscillator |
| Pages / Page | 14 / 1 — FeaTures. DescripTion. 1kHz to 68MHz Square Wave Output. 0.5% (Typ) … |
| File Format / Size | PDF / 246 Kb |
| Document Language | English |
FeaTures. DescripTion. 1kHz to 68MHz Square Wave Output. 0.5% (Typ) Initial Frequency Accuracy
Model Line for this Datasheet
Text Version of Document
LTC6903/LTC6904 1kHz to 68MHz Serial Port Programmable Oscillator
FeaTures DescripTion
n
1kHz to 68MHz Square Wave Output
The LTC®6903/LTC6904 are low power self contained digital n
0.5% (Typ) Initial Frequency Accuracy
frequency sources providing a precision frequency from n
Frequency Error <1.1% Over All Settings
1kHz to 68MHz, set through a serial port. The LTC6903/ n
10ppm/°C Typical Frequency Drift Over
LTC6904 require no external components other than a
Temperature
power supply bypass capacitor, and they operate over a n 0.1% Resolution single wide supply range of 2.7V to 5.5V. n 1.7mA Typical Supply Current (f < 1MHz, VS = 2.7V) The LTC6903/LTC6904 feature a proprietary feedback loop n 2.7V to 5.5V Single- Supply Operation that linearizes the relationship between digital control set- n Jitter <0.4% Typical 1kHz to 8MHz ting and frequency, resulting in a very simple frequency n Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial setting equation: Interface n Output Enable Pin 2078 Hz ( ) f OCT = 2 • ; kH 1 z < f < 6 MH 8 z n –55°C to 125°C Operation DAC n 2 – MS8 Package 1024
applicaTions
where OCT is a 4-bit digital code and DAC is a 10-bit digital code. n Precision Digitally Controlled Oscillator The LTC6903 is controlled by a convenient SPI compatible n Power Management serial interface. The LTC6904 uses an industry standard n Direct Digital Frequency Synthesis (DDS) I2C compatible interface. Replacement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Replacement for DAC and VCO ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property n Switched Capacitor Filter Clock of their respective owners. Protected by U.S. Patents, including 6342817 and 6614313.
Typical applicaTion LTC6903 Frequency Error A Microcontroller Controlling Its Clock Distribution
40 VS = 3V 5V TA = 25°C f = 1039Hz 443 MICROCONTROLLER GND V+ 30 UNITS OSC1/CLKIN TESTED OSC2/CLKOUT SDI OE 10k MCLR/V RC5/SDO LTC6903 P–P 20 10Ω UNITS SCK CLK RC3/SCK/SCL 5V VDD RC2/CCP1 1µF 10 V SEN CLK SS 0.1µF VSS 0.01µF PIC16F73 POWER-UP CLOCK 0 FREQUENCY IS 1039Hz 69034 TA01 –1.0 –0.5 0 0.5 1.0 FREQUENCY ERROR (%) 69034 TA01b 69034fe 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Power Requirements Serial Port Electrical Characteristics Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Theory of Operation Applications Information Package Description Revision History Typical Application Related Parts
FeaTures DescripTion
n
1kHz to 68MHz Square Wave Output
The LTC®6903/LTC6904 are low power self contained digital n
0.5% (Typ) Initial Frequency Accuracy
frequency sources providing a precision frequency from n
Frequency Error <1.1% Over All Settings
1kHz to 68MHz, set through a serial port. The LTC6903/ n
10ppm/°C Typical Frequency Drift Over
LTC6904 require no external components other than a
Temperature
power supply bypass capacitor, and they operate over a n 0.1% Resolution single wide supply range of 2.7V to 5.5V. n 1.7mA Typical Supply Current (f < 1MHz, VS = 2.7V) The LTC6903/LTC6904 feature a proprietary feedback loop n 2.7V to 5.5V Single- Supply Operation that linearizes the relationship between digital control set- n Jitter <0.4% Typical 1kHz to 8MHz ting and frequency, resulting in a very simple frequency n Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial setting equation: Interface n Output Enable Pin 2078 Hz ( ) f OCT = 2 • ; kH 1 z < f < 6 MH 8 z n –55°C to 125°C Operation DAC n 2 – MS8 Package 1024
applicaTions
where OCT is a 4-bit digital code and DAC is a 10-bit digital code. n Precision Digitally Controlled Oscillator The LTC6903 is controlled by a convenient SPI compatible n Power Management serial interface. The LTC6904 uses an industry standard n Direct Digital Frequency Synthesis (DDS) I2C compatible interface. Replacement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Replacement for DAC and VCO ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property n Switched Capacitor Filter Clock of their respective owners. Protected by U.S. Patents, including 6342817 and 6614313.
Typical applicaTion LTC6903 Frequency Error A Microcontroller Controlling Its Clock Distribution
40 VS = 3V 5V TA = 25°C f = 1039Hz 443 MICROCONTROLLER GND V+ 30 UNITS OSC1/CLKIN TESTED OSC2/CLKOUT SDI OE 10k MCLR/V RC5/SDO LTC6903 P–P 20 10Ω UNITS SCK CLK RC3/SCK/SCL 5V VDD RC2/CCP1 1µF 10 V SEN CLK SS 0.1µF VSS 0.01µF PIC16F73 POWER-UP CLOCK 0 FREQUENCY IS 1039Hz 69034 TA01 –1.0 –0.5 0 0.5 1.0 FREQUENCY ERROR (%) 69034 TA01b 69034fe 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Power Requirements Serial Port Electrical Characteristics Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Theory of Operation Applications Information Package Description Revision History Typical Application Related Parts
