DAC38RF80_17 Datasheet, PDF (141/155 Pages) Texas Instruments – Dual- or Single-Channel, Single-Ended or Differential-Output, 14-bit, 9-GSPS, RF-Sampling DAC with JESD204B Interface and On-Chip PLL

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DAC38RF80, DAC38RF83, DAC38RF84
DAC38RF85, DAC38RF90, DAC38RF93
SLASEA3A – DECEMBER 2016 – REVISED FEBRUARY 2017
10 Power Supply Recommendations
Internally, DAC38RFxx comprises a digital subsystem, an analog subsystem, and a clock subsystem. Ideally, the
power supply scheme should be partitioned according to these three relatively independent blocks to minimize
interactions between them. Most importantly, sensitive analog and clock circuit power supply must be separated
from digital switching noise to reduce direct coupling and mixing of switching spurs. Table 132 shows the power
supply rails for DAC38RFxx grouped under their respective domains.
Supply rail
VDDIG1
VDDIO18
VDDR18
VDDS18
VDDT1
VDDE1
VDDL1_1
VEE18N
VDDA1
VDDA18
VDDOUT18
VDDPLL1
VDDAPLL18
VDDAVCO18
VDDCLK1
VDDL2_1
VDDTX1
VDDTX18
Table 132. Power Supply Domains
Nominal voltage (V)
+1.0
+1.8
+1.8
+1.8
+1.0
+1.0
+1.0
-1.8
+1.0
+1.8
+1.8
+1.0
+1.8
+1.8
+1.0
+1.0
+1.0
+1.8
Domain
Digital
Analog
Clock
An example power supply scheme suitable for most applications of DAC38RFxx is shown in Figure 170. It is
recommended to use ferrite beads (FB) to isolate the individual rails from each other.
Figure 170. Power Supply Scheme for DAC38RFxx
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