I notice that the details say that the square wave output is limited to 1MHz. I presume that is a limitation of the on chip comparator but it does surprise me. On 16 September 2014 21:44, Dom S wrote: > Neil - have a look at the Chinese AD9850 boards on eBay - around a fiver > delivered and range from 0.something to lots with plenty of resolution an= d > accuracy. > > > __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .