ZHCSDS3C May 2015 – April 2018 ADS52J90
PRODUCTION DATA.
Figure 78 shows the data eye measurement of the device JESD204B transmitter against the JESD204B transmitter eye mask at 3.125 Gbps.
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.
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.