ADS52J90 Datasheet, PDF (63/149 Pages) Texas Instruments – Multichannel, Low-Power, High-Speed ADC

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ADS52J90
SBAS690B – MAY 2015 – REVISED AUGUST 2015
Figure 79 shows the data eye measurement of the device JESD204B transmitter against the JESD204B
transmitter eye mask at 5 Gbps. This measurement is taken with PRE_EMP set to 7.
Figure 79. Eye Diagram at the CML Output at a Data Rate of 5 Gbps
The total jitter as a fraction of the UI changes with interface speed, pre-emphasis setting, and the length of the
trace from the transmitter pins to the external termination resistor. The total jitter at the transmitter pins can
exceed the transmitter eye mask specification for speeds beyond 5 Gbps. However, the interface can be made to
work (and meet the eye mask specification at the receiver inputs) at speeds higher than 5 Gbps for short trace
lengths. Figure 40 illustrates the total jitter as a function of the trace length (between the transmitter pins and the
termination resistor) for 5-Gbps, 6-Gbps, and 6.4-Gbps speeds. Figure 41 to Figure 43 illustrate the total jitter as
a function of the trace length for different pre-emphasis settings at 5 Gbps, 6 Gbps, and 6.4 Gbps, respectively.
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