Texas Instruments ADS8364EVM, User Manual, Page: 22 / 28

Digital Interface Supply
4-4
4.3 Digital Interface Supply
A unique feature of the ADS8364 is the built-in data buffer circuit with an
independent power source. The EVM provides a jumper—W18, which allows
for flexible voltage selection. When the shunt at W18 is in the factory default
position (W18 pins 2 and 3 shorted), the 3.3-V DSP supply taken from J11 is
applied to the BV
DD
pins of the ADS8364. By moving the shunt jumper on W18
to pins 1 and 2, the user chooses the 5-V ADC supply as the source of the
BV
DD
voltage.
J10 provides a means of supplying an alternative independent buffer voltage.
If desired, the shunt jumper at W18 can be totally removed, and a dc source
of 2.7 V to 5.25 V can be applied to J10 as a means to provide BV
DD
power.
Caution
While J10 is used, ensure that W18 remains completely open.
Figure 4 - 3. Digital Buffer Alternate Supply Input
C29
0.1
µ
F
C31
33
µ
F
+
L6
4.7
µ
H
TP23
BV
DD
DV
DD
DSP+3.3
1
2
J10
BGND
W18