# DAC: What waveform should I expect when ramping up?

I have a 14-bit DAC. Ramping the data pins linearly from the minimum of 0x0 to the maximum of 0x3FFF I see (using a scope) the analogue output voltage behaving as follows:

1. In the first half (from 0x0 to 0x2000), the voltage ramps from 1V to 1.8V.
2. In the second half (from 0x2000 to 0x3FFF), the voltage ramps from 0V to 1V.

Is this the expected behaviour? What output voltage range should I be expecting for the analogue output? Why is there a "break" at 0x2000?

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Can you tell us what DAC are you using? – Bruno Ferreira Jul 5 '12 at 19:01
I am using the AD9775BSV. The datasheet is linked in the question. – Randomblue Jul 5 '12 at 19:02
Sorry, missed that. – Bruno Ferreira Jul 5 '12 at 19:04