Power Supplies - Texas Instruments ADS8472EVM User Manual

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Description
Ground
Ground
Ground
Ground
Ground
Ground
Ground
This evaluation module provides direct access to all the analog-to-digital converter input control and output
signals via connector J6, see
Description
Chip Select Signal
Read Signal
Convert Start Signal
Byte Signal
RESERVED
Busy Signal
5

Power Supplies

The EVM accepts four power supplies.
• A dual ±VA DC supply for the dual supply op-amps. Recommend ±6VDC supply.
• A single +5.0 V DC supply for analog section of the board (A/D + Reference).
• A single +5.0V or +3.3V DC supply for digital section of the board (A/D + address decoder + buffers).
There are two ways to provide these voltages.
1. Wire in the 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 +5VD, or short between pins 2-3 to select
+3.3VD as the source for the digital buffer voltage supply (+BVDD).
Signal
+VA(+6V)
+5VA
DGND
N/C
+3.3VD
SLAU203 – February 2007
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Table 6. TSW1100 Connector (continued)
Signal Name
Ground J7.27
Ground J7.29
Ground J7.31
Ground J7.33
Ground J7.35
Ground J7.37
Ground J7.39
Table 6.
Table 7. Pin out for Converter Control Connector, J6
Signal Name
CS J6.1
RD J6.3
CONVST J6.5
BYTE J6.7
RESERVED J6.9
BUSY J6.11
Table 8. Power Supply Test Points
Signal
+BVDD Apply +3.3VDC or +5.0VDC. See ADC datasheet for full range.
+AVCC Apply +5.0VDC.
+VA Apply +6.0VDC. Positive supply for amplifier.
–VA Apply -6.0VDC. Negative supply for amplifier.
9. If using this connector, then set W1 jumper to connect +3.3VD or +5VD from
Table 9. Power Connector, J5, Pin Out
Power Connector – J5
1
3
5
7
9
Connector.Pin# Signal Name
J7.28 D11
J7.30 D12
J7.32 D13
J7.34 D14
J7.36 D15
J7.38 N/C
J7.40 INTc
Connector.Pin# Signal Name
J6.2 GND
J6.4 GND
J6.6 GND
J6.8 GND
J6.10 GND
J6.12 GND
Table 8.
Description
2
4
6
8
10
Power Supplies
Description
Data Bit 11
Data Bit 12
Data Bit 13
Data Bit 14
Data Bit 15
Not Connected
Trigger Clock
Description
Ground
Ground
Ground
Ground
Ground
Ground
Signal
–VA (-6V)
N/C
AGND
N/C
+5VD
ADS8472EVM 7