Comments on: Interfacing LTC6904 With Arduino

By: MAR

MAR — Wed, 22 Aug 2012 10:02:33 +0000

PIC XXXXX or atmel xxxxx or atmega xxxx

By: Arslan

Arslan — Fri, 13 Jul 2012 17:13:20 +0000

That is great. I very much appreciate your help.

By: kwong

kwong — Fri, 13 Jul 2012 00:43:14 +0000

Hi Arslan,

The output frequency of LTC6904 is determined by f=2^oct*2078/(2-dac/1024) (see data sheet), where 0<=oct<=15 and 0<=dac<=1023. The smallest frequency spacing is achieved when oct=0 and dac is 0 and 1. So at the highest resolution (lowest frequency) the step is around 0.5Hz and the step between the two highest frequencies (oct=15 dac=1022 and 1023) is around 200 kHz.

By: Arslan

Arslan — Thu, 12 Jul 2012 12:45:52 +0000

Hi Kerry,
Thank you so much for your reply and answering my naive question. What kind of frequency are you able to generate via this chip? I have ordered mines and waiting for it. Meanwhile it would be good to know what is the step size of the frequency? Are you able to generate for example, 6.56Mhz and then changing the register values to get 6.57Mhz?

thanks once again

By: kwong

kwong — Wed, 11 Jul 2012 22:35:59 +0000

Hi Arslan,

There really isn’t anything special about the schematic though, you only need to connect the chip SCL pin to Arduino’s analog input 5, SDA pin to Arduino’s analog input 4 and connect the ground together. The chip can be either powered from the 5V on the Arduino board or using a separate power supply.

By: Arslan

Arslan — Wed, 11 Jul 2012 14:31:31 +0000

Hi Kerry,

I am going to use this chip and integrate it with arduino. Could you please upload a schematic of the circuit you used as well?
Thank you.