I2C/SPI IC frequency counter
I2C/SPI IC frequency counter
(OP)
I need a frequency counter that can operated from about 10mhz-300mhz, and I'd prefer it be an IC that supports a standard kind of 2 or 4 wire communication - I'd basically like it to operate as if it were an ADC. I tried googling and looking up stuff couldn't really find a part that fits the bill, anyone know of any?
Thanks,
Ambert
Thanks,
Ambert





RE: I2C/SPI IC frequency counter
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: I2C/SPI IC frequency counter
A PECL prescaller ought to work up to 300MHz (of course
you will loose some resolution).
I've driven the fast counters in PICs up to 15MHz without
a problem when the pic is run at 20MHz. After that you
can certianly pass it to I2C interface.
I built a little 100MHz counter with a Fast Schottky
prescaler that was autoranging and drove 8 LEDs. Passed
it to a 16F628 runnning at 20MHz. Had to adjust the
gate timing to account for the Xtal. It was interesting
to watch the readout change when I heated up the Xtal
with my finger.......
I used the EEPROM registers to hold the adjustment. Little
bit of a "user interface" to calibrate it.
Should have put an TXCO on it, but it is usually used
around room temperature, so it works o.k.
RE: I2C/SPI IC frequency counter
Do you need one or for poroduction?
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: I2C/SPI IC frequency counter
any FPGA development system?
Any other specs you can add? Every omitted spec adds
to the complexity, design time etc.
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: I2C/SPI IC frequency counter
No real other specs... it's for a test automation setup not production board. Thanks for the information nbucska!
Actually a coworker told me to try Maxim, I'm giving one of their app engineers a call.
RE: I2C/SPI IC frequency counter