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Power Supplies
This evaluation module provides direct access to all the analog-to-digital converter input control and output
signals via connector J4; see
Description
Chip Select signal
Read signal
Convert Start signal
Byte signal
18 or 16 bit bus signal
Busy signal
5
Power Supplies
The EVM accepts four power supplies.
• A dual ±VA DC supply for the dual-supply operational amplifiers. Recommend ±12-VDC supply.
• A single +5-VDC supply for analog section of the board (A/D + Reference).
• A single +5-V or +3.3-VDC supply for digital section of the board (A/D + address decoder + buffers).
These voltages can be provided in two ways.
1. Wire in voltages at test points on the EVM. See
Test Point
TP6
TP3
TP4
TP5
2. Use the power connector J5, and derive the voltages elsewhere. The pinout for this connector is
shown in
Table
connector to +BVDD. Short between pins 1-2 to select +5 VDC, or short between pins 2-3 to select
+3.3 VDC as the source for the digital buffer voltage supply (+BVDD).
Signal Power
+VA (+12V)
+5 VA
DGND
N/C
+3.3 VD
6
Using the ADS8481EVM
The ADS8481EVM serves the functions of being a reference design, a prototyping board, and finally as an
software test platform.
6
ADS8481EVM
Table
6.
Table 6. Pinout for Converter Control Connector, J6
Signal Name
CS
RD
CONVST
BYTE
BUS18/16
BUSY
Table 7. Power Supply Test Points
Signal
+BVDD
Apply +3.3 VDC or +5 VDC. See ADC data sheet for full range.
+AVCC
Apply +5 VDC.
+VA
Apply +12 VDC. Positive supply for amplifier.
–VA
Apply –12 VDC. Negative supply for amplifier.
8. If using this connector, then set W1 jumper to connect +3.3 VDC or +5 VDC from
Table 8. Power Connector, J1, Pinout
1
3
5
7
9
Connector Pin No.
Signal Name
J6.1
J6.2
J6.3
J6.4
J6.5
J6.6
J6.7
J6.8
J6.9
J6.10
J6.11
J6.12
Table
7.
Description
Connector – J1
2
4
6
8
10
SLAU182A – June 2006 – Revised September 2006
www.ti.com
Description
GND
Ground
GND
Ground
GND
Ground
GND
Ground
GND
Ground
GND
Ground
Signal
–VA (–12V)
N/C
AGND
N/C
+5VD
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