AD9142ABCPZ datasheet(29/73 Pages) AD

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AD9142A

Data Sheet

Interface Timing Requirements

The following example shows how to calculate the optimal

delay at the data source to achieve the best sampling timing in

the delay line interface mode:

•

fDCI = 200 MHz

•

Delay setting = 0

The shadow area in Figure 38 is the interface setup and hold

time window set to 0. To optimize the interface timing, this

window must be placed in the middle of the data transitions.

Because the input is double data rate, the available data period

is 2.5 ns. Therefore, the optimal data bus delay, with respect to

the DCI at the data source, can be calculated as

−

PERIOD

DATA

DELAY

SPI Sequence to Enable Delay Line Interface Mode

Use the following SPI sequence to enable the delay line interface

mode:

0x5E → 0x00 /* Configure the delay

setting */

0x5F → 0x60

0x0D → 0x16 /* DC couple DCI */

0x0A → 0x00 /* Turn off DLL and duty

cycle correction */

Rev. A | Page 28 of 72

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