DAC38RF86 datasheet(48/147 Pages) TI2

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DAC38RF86, DAC38RF96

DAC38RF87, DAC38RF97

SLASEF4B – FEBRUARY 2017 – REVISED JULY 2017

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Table 29. Eye Scan Mode Selection (continued)

ES[3:0]

EFFECT

1x11

Timed Compare. As ES = 001x, but analyses over the time interval specified by ESLEN. Analyses zeroes when ES[2] =

0, and ones when ES[2] = 1.

When ES[3] = 0, the selected analysis runs continuously. However, when ES[3] = 1, only the number of qualified

samples specified by ESLed, as shown in Table 30. In this case, analysis is started by writing a 1 to ESRUN (it is

not necessary to set it back to 0). When analysis completes, ESDONE is set to 1.

Table 30. Eye Scan Run Length

ESLen

NUMBER OF SAMPLES ANALYZED

127

1023

8095

65535

When ESVO OVR = 1, the ESVO field determines the amount of offset voltage that is applied to the eye scan

data samplers associated with rxpi and rxni. The amount of offset is variable between 0 and 300 mV in

increments of ~10 mV, as shown Table 31. When ES[3] = 1, ESVO OVR must be 0 to allow the optimized

voltage offset to be read back via ESVO.

Table 31. Eye Scan Voltage Offset

ESVO

OFFSET (mV)

100000

-310

…

111110

-20

111111

-10

000000

000001

000010

…

011111

300

The phase position of the samplers associated with rxpi and rxni, is controlled to a precision of 1/32UI. When ES

is not 00, the phase position can be adjusted forwards or backwards by more than one UI using the ESPO field,

as shown in Table 32. In normal use, the range should be limited to ±0.5 UI (+15 to –16 phase steps).

Table 32. Eye Scan Phase Offset

ESPO

OFFSET (1/32 UI)

011111

+63

…

000001

000000

111111

-1

…

100000

-64

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