clock for ADC

[duratia]

Hi,

I'd like to design the clock for ADC using crystal (1 MHz), how is the connection to the ADC? Do I also need capacitor/extra components? Can you describe me the schematic?

[prateeksikka]

connection to ADC depends on Pin Diagram of the ADC u are to use.
Make sure that it is well synchronized with i/p data frequency and sampling rate of ADC.
Dallas Chips are most famous as ADCs...

[MP]

What is the part number of the ADC you are using? This information should be in the data sheet. Some ADC chips have internal clock and only need a capacitor and resistor. Others have a pin marked CLK, which requires a clock input.
If you cannot find the information in your data sheet, let us know the part number and we can go from there.

MP

[prateeksikka]

hi duratia!
most of the ADCs have external clocks....
tell me the number of the ADC anyway.

[duratia]

Hi,

I use ADC 0809. I am no longer use Xtal for the Clock, but I use timer2 from Microcontroller. But, I still need your advise how to generate clock using Xtal to ADC?
The range is 600-1000 KHz.

[prateeksikka]

i guess u wish to have a variable frequency of the crystal to be controlled through a controller.
am i right?
ADC with variable frequency clock?

[duratia]

Hi,

The frequecy is constant. I don't need to change the frequency, it's fixed to 1 MHz (like I programmed now). But, I am still curious how to generate clock using Xtal, because the Xtal can't be "stand-alone". If all of the port/pin of microcontroller has been used and I need 1 pin more, I must generate the clock of ADC using Xtal.

[MP]

On the ADC0809, all you need to do is to connect the clock output of a cmos or crystal clock circuit to the pin named CLK. The clock does not have to be made with a crystal. The CLK pin is looking for a pulse train input from a clock circuit.
Is this what you wanted to know?

MP