Texas Instruments ADS1271EVM User Manual page 6

EVM Operation
5 EVM Operation
The following section provides information on the analog input, digital control, and general operating
conditions of the ADS1271EVM. Refer to
left, middle and right for switch settings in the following discussion.
5.1 Analog Input
The analog input sources can be applied directly to J1 (top or bottom side) or through the auxiliary
connectors J4 and J5. The analog input signals can be routed directly to the two ADS1271s on the EVM,
or they can be routed through an optional buffer amplifier stage built around U5 or U6. Consult the
ADS1271 data sheet to determine the maximum analog input range.
switches S1 and S2. S4 and S6 can be used to select the routing of the ADS1271 analog inputs as shown
in Table 8.
S1/S2 Position
Top
Middle
Bottom
S4/S6 Position
Left
Middle
Right
6 ADS1271EVM & ADS1271EVM-PDK
Figure 1
LEFT
MIDDLE
Figure 1. ADS1271EVM Switch and Jumper Locations
Table 7. Buffer Amplfier Options - S1 and S2
Table 8. ADC Analog Input Options - S4 and S6
for switch and jumper locations, and the meanings of
RIGHT
Table 7
Analog Inputs
Input from J1
Input from J4/J5 auxiliary inputs
No connection
Analog Inputs
Input from Buffer Amplifier
Input from J1
Input from J4/J5 auxiliary inputs
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summarizes the position of
SBAU107 – November 2004