ADA4356ABCZ datasheet(46/61 Pages) AD

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Data Sheet

ADA4356

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Rev. 0

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Figure 95. Data Eye for LVDS Outputs in ANSI-644 Mode with Trace Lengths Greater than 24inches (Approximate 36inch Trace

Length Result Shown) on Standard FR-4 Material, External 100Ω Far End Termination Only

Figure 96 shows a TIE jitter histogram with trace lengths greater than 24inches on standard FR-4 material.

Figure 96. TIE Jitter Histogram for Trace Lengths Greater than 24inches (Approximate 36inch Trace Length Result Shown) on

Standard FR-4 Material

Two output clocks assist in capturing data from the ADA4356. The DCO clocks the output data and is equal to 4× the

sample clock (CLK) rate for the default mode of operation. Data is clocked out of the ADA4356 and must be captured

on the rising and falling edges of the DCO that supports DDR capturing. The FCO signals the start of a new output

byte and is equal to the sample clock rate in 1× frame mode. For more details, see Figure 6.

When the SPI is used, the DCO phase can be adjusted in approximately 60° increments relative to one data cycle (30°

relative to one DCO cycle). This adjustment allows the user to refine system time margins, if required. The example

DCOP and DCON timing, as shown in Figure 6, is 180° relative to one data cycle (90° relative to one DCO cycle).

In power-on default mode, as shown in Figure 6, the MSB is first in the data output serial stream. This configuration

can be inverted by programming the SPI so that the LSB is first in the data output serial stream.

Digital Output Coding

There are 12 digital output test pattern options available that can be initiated through the SPI. This feature is useful

when validating receiver capture and timing. For the output bit sequencing options available, see Table 15. Some

test patterns have two serial sequential words and can be alternated in various ways depending on the test pattern

chosen.

500

400

300

200

100

–500

–400

–300

–200

–100

–0.8

–0.4

TIME (ns)

0.4

0.8

EYE: ALL BITS

ULS: 8000/414024

10k

12k

–800

–600

–400

–200

200

400

600

TIME (ps)

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