AD5686 datasheet(23/28 Pages) AD

23 / 28 page

Data Sheet

AD5686/AD5684

Rev. A | Page 23 of 28

HARDWARE RESET (RESET)

RESET is an active low reset that allows the outputs to be

cleared to either zero scale or midscale. The clear code value is

user selectable via the RESET select pin. It is necessary to

keep RESET low for a minimum of 30 ns to complete the

operation (see Figure 2). When the RESET signal is returned

high, the output remains at the cleared value until a new value

is programmed. The outputs cannot be updated with a new

value while the RESET pin is low. There is also a software

executable reset function that resets the DAC to the power-

on reset code. Command 0110 is designated for this software

reset function (see Table 8). Any events on LDAC or RESET

during power-on reset are ignored.

RESET SELECT PIN (RSTSEL)

The AD5686/AD5684 contain a power-on reset circuit that

controls the output voltage during power-up. By connecting

the RSTSEL pin low, the output powers up to zero scale. Note

that this is outside the linear region of the DAC. By connecting

the RSTSEL pin high, VOUT powers up to midscale. The output

remains powered up at this level until a valid write sequence

is made to the DAC.

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