ADA4355ABCZ datasheet(30/45 Pages) AD

30 / 45 page

ADA4355

Data Sheet

Rev. A | Page 30 of 45

Figure 86 shows the LVDS output timing example in reduced

range mode.

D0Ax 400mV/DIV

D1Ax 400mV/DIV

DCOx 400mV/DIV

FCOx 400mV/DIV

4ns/DIV

Figure 86. LVDS Output Timing Example in Reduced Range Mode

Figure 87 shows an example of the LVDS output data eye using

the ANSI-644 standard (default) with trace lengths of less than

24 inches on standard FR-4 material.

500

400

300

200

100

–500

–400

–300

–200

–100

–0.8

–0.4

0.4

0.8

EYE: ALL BITS

ULS: 7000/400354

TIME (ns)

Figure 87. Data Eye for LVDS Outputs in ANSI-644 Mode with Trace Lengths

of Less Than 24 Inches (Approximate 6 Inch Trace Length Result Shown) on

Standard FR-4 Material, External 100 Ω Far End Termination Only

Figure 88 shows a time interval error (TIE) jitter histogram

with trace lengths of less than 24 inches on standard FR-4

material.

200

250

300

350

TIME (ps)

400

450

500

Figure 88. TIE Jitter Histogram for Trace Lengths Less Than 24 Inches

(Approximate 6 Inch Trace Length Result Shown) on Standard FR-4 Material

The TIE jitter histogram reflects the decrease of the data eye

opening because the edge deviates from the ideal position. It is

the responsibility of the user to determine if the waveforms

meet the timing budget of the design.

The format of the output data is twos complement by default. An

example of the output coding format can be found in Table 12.

To change the output data format to offset binary, see the

Memory Map section.

Immediately after power-on, the ADA4355 output serial stream

sets as double data rate (DDR), two-lane, byte wise, MSB first,

1× frame, and 16-bit mode. In this default setting, the

ADA4355 data rate for each serial stream is equal to (16 bits ×

the sample clock rate)/2 lanes, with a maximum of 1 Gbps per

lane ((16 bits × 125 MSPS)/2 lanes = 1 Gbps per lane).

Figure 89 shows an example of the LVDS output data eye using

the ANSI-644 standard (default) with trace lengths greater than

24 inches on standard FR-4 material.

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

Figure 89. Data Eye for LVDS Outputs in ANSI-644 Mode with Trace Lengths

Greater Than 24 Inches (Approximate 36 Inch Trace Length Result Shown) on

Standard FR-4 Material, External 100 Ω Far End Termination Only

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