si570 board controlled by atmel ATTINY2313 MCU

the si570 is a chip containing a VCO with a frequency range from
4850 Mhz to 5670 Mhz. The frequency of the VCO is devided by a 38 bit counter
and syncronized with a 114.285 MHz crystal oscillator.
another two counters devide the resulting frequency by 390 possible values
ranging from 4 to 1408
this makes a possible step size from 0.008 HZ (devided by 1408) to 2.85 Hz (devided by 4)

The cmos version that i used ranges from 3.44 MHz to 160 MHz(!)

The chip is programed via a i2c bus

the involved math was a little tricky with the 2kb flash rom of the attiny 2313
thats why i had to use 2 of them i ran out of flash rom

Category:

Science & Technology

Tags:

• si570
• homebrew
• avr
• atmel
• 2313
• radio
• ham
• microcontroler
• xtal
• xvo
• vco
• signal
• generator
• oscillator
• pll
• dss
• synthesizer