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Programmable Clock Generator Li'lBoard page.
Model number: LB4.08.
Description: The chip used here is an LTC6903 which contains a resistor-controlled oscillator (where the resistance is controlled by a 4-bit code) followed by a 10-bit divider. It can produce a wide range of clock frequenciess. The device is SPI controlled via a 16 bit word.
Applications: Produce a square wave clock signal from about 1 kHz up to a bit more than 68 MHz.
The board can be used without the LTC6903 if only the 4-way buffer, the PI6C18551, is desired.
Features:
•Both the chips are specified at 3.3 V to 5 V. The oscillator is even specified down to 2.7 V.
•Clock and inverted clock are provided (however only one phase is buffered by the PI618551).
•A half size, 4-pin DIP case size oscillator can be simulated since there are 4 pads in just the right place to allow soldering in stiff wires or pins so that the board can be plugged down into or soldered onto another board that has a site for that common type of oscillator.
•An LTC6904 can be used if an I2C interface is needed instead of the SPI interface used in the LTC6903. If that is the case then the /SEN pin is used as a 1-bit I2C address. It is marked /SEN(adr) on the top side to cover this option.
Key components: LTC6903 (option: I2C version is LTC6904), PI6C18551 buffer.
Images:
Vin max: 5.5
Vin min: 2.7 (3.3 for the buffer)
SPI: Yes.
Tenth centers: YES