Programmable Oscillator - 8kHz to 133MHz

Product Description

Description: The DS1077 is a dual-output, programmable, oscillator requiring no external
components for operation. The DS1077 can be used as a processor-controlled frequency synthesizer or
as a standalone oscillator. The two synchronous output operating frequencies are user-adjustable in
submultiples of the master frequency through the use of two on-chip programmable prescalers and a
divider. The specific output frequencies chosen are stored in non-volatile (EEPROM) memory. The DS1077
defaults to these values upon power-up.



The DS1077 features a 2-wire serial interface that allows in-circuit on-the-fly programming of the
programmable prescalers (P0 & P1) and divider (N) with the desired values being stored in NV
(EEPROM) memory. Design changes can be accommodated in-circuit on-the-fly by simply
programming different values into the device (or reprogramming previously programmed devices).
Alternatively, for fixed frequency applications, previously programmed devices can be used and no
connection to the serial interface is required.

Features:

• Processor-controlled or standalone solidstate oscillator
  
• Frequency changes on-the-fly
  
• Dual low-jitter, synchronous fixed frequency outputs
  
• 2-wire serial interface (I2C)
• Frequency outputs 16.2kHz to 133MHz
  
• ?0.5% variation over temp (+25?C to +70?C)
  
• ?0.5% initial tolerance
  
• Nonvolatile (NV) setting storage
  
• Single 5V supply
  
• No external component
  
• Power-down mod
  
• Synchronous output gatin
  

• DS1077 Datasheet
• Maxim Application Notes
• Example C Code (zip)