Programmable frequency divider chip

Thread Starter

taydin

Joined Dec 10, 2013
2
I am trying to find a programmable frequency divider chip, but haven't had any luck so far.

This chip should have two inputs, where I will connect 22.5792 MHz and 24.576 MHz crystal oscillators. This chip should also have 4 outputs where the divided forms of the input clocks will be present. For example:

O1 = 22.5792 / 8
O2 = 24.576 / 4
O3 = 24.576 / 2
O4 = 24.576 / 8

There should also be some kind of a control port (SPI or I2C) that I can use to configure the outputs. It is very important that I use crystal oscillators, so a PLL type synthesizes is a no go.

I know that this type of circuit is available as ASIC IP's, but I obviously need an IC that does this. Anybody know a chip that does this?
 

crutschow

Joined Mar 14, 2008
30,801
The divider could be a counter such as the 74194. Controlling this from a serial control port will require some type of serial decoder circuit. Not familiar with whats available for that.
 

#12

Joined Nov 30, 2010
18,223
It's called a modulo N divider. I worked on those in 1979 but I forgot the part number. At least I remembered a term to search for it.
 

Thread Starter

taydin

Joined Dec 10, 2013
2
I was hoping to find a chip that has all the dividers, the muxes and the control circuit in it. I can't use discrete logic, that would take too much space. Guess I have to look into getting this done with an FPGA.
 
Top