Datasheet

5 Power Supplies
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Table 5. Data Bus Connector P2 (continued)
Description Signal Name Connector Pin No. Signal Name Description
Data bit 15 DB15 P2.31 P2.32 GND Ground
Data bit 16 DB16 P2.33 P2.34 GND Ground
Data bit 17 DB17 P2.35 P2.36 GND Ground
This evaluation module provides direct access to all the ADC input control and output signals via
connector J4; see Table 6 .
Table 6. Pinout for Converter Control Connector, J6
Description Signal Name Connector Pin No. Signal Name Description
Chip Select signal CS J6.1 J6.2 GND Ground
Read signal RD J6.3 J6.4 GND Ground
Convert Start signal CONVST J6.5 J6.6 GND Ground
Byte signal BYTE J6.7 J6.8 GND Ground
18- or 16-bit bus signal BUS18/ 16 J6.9 J6.10 GND Ground
Busy signal BUSY J6.11 J6.12 GND Ground
The EVM accepts four power supplies.
• A dual ± VA dc supply for the dual-supply operational amplifiers. Recommend ± 6-VDC supply.
• A single +5-VDC supply for analog section of the board (analog-to-digital [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; Table 7 summarizes this option.
Table 7. Power-Supply Test Points
Test Point Signal Description
TP6 +BVDD Apply +3.3 VDC or +5 VDC. See ADC data sheet for full range.
TP3 +AVCC Apply +5 VDC.
TP4 +VA Apply +6 VDC. Positive supply for amplifier.
TP5 –VA Apply –6 VDC. Negative supply for amplifier.
2. Use the power connector J5, and derive the voltages elsewhere. The pinout for this connector is
shown in Table 8 . If using this connector, then set W1 jumper to connect +3.3 VD or +5 VD from
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).
Table 8. Power Connector, J1, Pinout
Signal Power Connector: J1 Signal
+VA (+6 V) 1 2 –VA (–6 V)
+5 VA 3 4 N/C
DGND 5 6 AGND
N/C 7 8 N/C
+3.3 VD 9 10 +5 VD
ADS848xEVM 8 SLAU186A – August 2006 – Revised September 2008
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