Quick Reference
3
Quick Reference
provides a quick summary of the connections required for operation of the EVM as a stand-alone
Table 3. Critical Connections
Function
Header/Pin
Pin Name
Description
CS
N/A
N/A
N/A
SCLK
J5.3
CLKX
SCLK
SPI
DIN
J5.11
DX
Data In
DOUT
J5.13
DR
Data Out
Interrupt
J5.15
INT
FSYNC
1.8V
J3.7
+1.8VD
Digital supply
Power
3.3V
J3.9
+3.3VD
Digital supply
5.0V
J3.3
+5VA
Analog supply
Channels 1-4
J1.1-8
Analog Inputs
Analog Inputs
Analog Inputs (ADS1278 and
Channels 5-8
J3.3-10
ADSADS1178 only)
CAUTION
When using the EVM as part of the ADS1278EVM-PDK, the DIP switches S1
and S2 must all be switched so that they are down, toward the center of the
board. Failure to do so may damage the EVM.
3.1
Analog Inputs
The analog inputs for the ADS1278EVM are connected to J1 and J3. Channels 1-4 connect to J1 and
provisions are provided to buffer these signals before being connected to the converter. Switches S4-S5
and S7-S8 control whether the buffered or unbuffered signal is connected to the ADS1278. Channels 5-8
connect to J3 and have an RC filter available to filter the input before connecting to the converter.
Channels 5-8 do not have provisions for buffering the signal.
3.2
Digital Control
The digital control signals can be applied directly to J4 (top or bottom side).
3.3
Power Supply
The ADS1278EVM requires power rails as follows:
•
5.0V analog supply - supplied by MMB0 motherboard via J13B
•
3.3V digital supply - supplied by MMB0 motherboard
•
1.8V digital supply - supplied by MMB0 motherboard
3.4
Voltage Reference
The ADS1278EVM has two options for the reference voltage. Switch S3 selects the reference voltage
from either the buffered REF5025 or a external reference voltage that is connected to the reference pins
of J3.
6
ADS1x7xEVM-PDK
SBAU197
–
February 2012
Copyright
©
2012, Texas Instruments Incorporated
