Texas Instruments ADS1271EVM, Руководство пользователя, Страница: 9 / 24

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ADS1271EVM Hardware Details
Table 5. Analog Interface Pinout (J1) (continued)
Pin Number Signal Description
J1.8 Unused
J1.15 Unused
J1.18 REF(-) External reference source low side
J1.20 REF(+) External reference source input (2.5V NOM)
J1.9-J1.19 (odd) GND Analog ground connections (except J1.15)
J1.10-J1.16 Unused
(even)
Table 6. Auxiliary Analog Input 1 Pinout (J4)
Pin Number Signal Description
J4.1 AUX1P Auxiliary Signal Input 1 - Positive terminal
J4.2 AUX1N Auxiliary Signal Input 1 - Negative terminal
J4.3 AUXREF1P Auxiliary Reference Input 1 - Positive terminal
J4.4 AUXREF1N Auxiliary Reference Input 1 - Negative terminal
J4.5 GND Ground
Table 7. Auxiliary Analog Input 2 Pinout (J5)
Pin Number Signal Description
J5.1 AUX2P Auxiliary Signal Input 2 - Positive terminal
J5.2 AUX2N Auxiliary Signal Input 2 - Negative terminal
J5.3 AUXREF2P Auxiliary Reference Input 2 - Positive terminal
J5.4 AUXREF2N Auxiliary Reference Input 2 - Negative terminal
J5.5 GND Ground
5.2.2 Analog Input Selection
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. Table 8 summarizes the position of switches S1 and S2. S4
and S6 can be used to select the routing of the ADS1271 analog inputs as shown in Table 9 .
Table 8. Buffer Amplifier Options - S1 and S2
S1/S2 Position Analog Inputs
Top Input from J1
Middle Input from J4/J5 auxiliary inputs
Bottom No connection
Table 9. ADC Analog Input Options - S4 and S6
S4/S6 Position Analog Inputs
Left Input from Buffer Amplifier
Middle Input from J1
Right Input from J4/J5 auxiliary inputs
9 SBAU107C – November 2004 – Revised November 2014 ADS1271EVM and ADS1271EVM-PDK User's Guide
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