Texas Instruments ADS1178EVM, Руководство пользователя, Страница: 8 / 52

5 Voltage Reference
Voltage Reference
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Table 5. J15 +10V Selection
Jumper Name Function
1-2 (OB) +10V Select the +10V that is
generated on the EVM
2-3 (EXT) +VA Select the exVA voltage
Table 6. J16 –10V Selection
Jumper Name Function
1-2 –10V Select the –10V that is generated
on the EVM
2-3 –VA Select the external –VA voltage
Figure 2. Connectors J15, J16
The ADS1278EVM has three sources for the reference voltage. Jumper J1 can select the voltage from
either the REF3125 (U1) or REF5025 (U2). The reference from either source is filtered and buffered by
U3A. Switch S1 chooses either the onboard reference or the external reference voltage that is connected
to the reference pins of J9.
Figure 3 illustrates the pinout for connector J1. Figure 4 shows switch S1 as it
appears on the EVM.
Figure 3. Connector J1
8 ADS1178EVM, ADS1278EVM, ADS1178EVM-PDK, and ADS1278EVM-PDK SBAU129C – November 2007 – Revised July 2008
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