AD9635 power-up time

Hi Alberto,

Yes, you are correct. The 375us wake-up time from power down is the time to wake-up from the power-down mode, and not from initially bringing up the power supplies.

When first powered up (and also after a Register 0x08 Digital Reset), the AD9635 goes through an initialization sequence. This sequence takes about 3 million sample clock cycles. This process starts after the analog is up.

At a sample clock frequency of 125MHz, 3 million clock cycles takes about 24ms. If we say that the analog take about 1ms to come up (375us + fudge factor), this gives us 25ms. So, conservatively let's say that 40ms is needed.

A lower sample rate will obviously increase the time required.

Thank you.

Doug

Hi Alberto,

Yes, you are correct. The 375us wake-up time from power down is the time to wake-up from the power-down mode, and not from initially bringing up the power supplies.

When first powered up (and also after a Register 0x08 Digital Reset), the AD9635 goes through an initialization sequence. This sequence takes about 3 million sample clock cycles. This process starts after the analog is up.

At a sample clock frequency of 125MHz, 3 million clock cycles takes about 24ms. If we say that the analog take about 1ms to come up (375us + fudge factor), this gives us 25ms. So, conservatively let's say that 40ms is needed.

A lower sample rate will obviously increase the time required.

Thank you.

Doug