Texas Instruments ADS8364EVM, User Manual, Page: 14 / 28

2-4
2.4 Output Buffer 3.3-V Supply
As mentioned above, the ADS8364EVM board is configured at the factory for
operation on the TMS320C6711 DSK platform. Since the interface to this DSP
is 3.3 V, the buffer supply voltage is taken from the DSP 3.3-V source found
on the interface connector at J11 (pins 41 and 42). The 3.3-V DSP supply is
routed through the shunt jumper on W18 (pins 2 - 3). Placing the shunt on pins
1 and 2 supplys the 5-V digital source (via V9) to the buffer circuit.
The digital buffer circuit of the ADS8364 can also be powered from an external
source via J10. When operated in this fashion, the shunt jumper at W18 should
be completely removed in order to prevent possible damage to the EVM or
DSK circuitry. The buffer voltage has a range of 2.7 VDC to 5.5 VDC maximum.
Figure 2 - 2. Digital Buffer Voltage Selection
IN1
IN2
ENA
GND
IN1
OUT
OUT
L4
4.7
µ
H
8
7
5
1
3
2
Low = VIN1
W14
R70
10 k
Ω
DSP+5 5 V
TPS2104D
C73
0.1
µ
F
C28
10
µ
F
TP7
AV
DD
L5
4.7
µ
H
C77
0.1
µ
F
C30
10
µ
F
TP21
DV
DD
+
+
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
U9
W18