Texas Instruments ADS1178EVM, User Manual, Page: 7 / 52

4 Power Supplies
4.1 Bipolar Power Options
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Power Supplies
Figure 1. Connector J2
J3 is the power-supply input connector. Table 4 lists the configuration details for J3. Analog inputs to the
ADC can be applied directly to the device (see Section 8.1 , Analog Input ), bypassing the onboard
amplifiers, and in this case only +5V and +3.3V are required to power the EVM. If the amplifiers are used,
an additional bipolar supply is needed to power them. The EVM includes a switching power supply to
generate a +10V and –10V supply. For optimum noise performance, the external supplies (+VA and –VA)
should be used.
Table 4. J3 Configuration: Power-Supply Input
Pin No. Pin Name Function Required
J3.1 +VA +10V to +15V Yes, unless o10V is
used.
J3.2 –VA -10V to –15V Yes, unless onboard –10V is
used.
J3.3 +5VA +5V analog supply Always
J3.4 –5VA –5V analog supply No
J3.5 DGND Digital ground input Yes
J3.6 AGND Analog ground input Yes
J3.7 +1.8VD 1.8V digital supply No
J3.8 +3.3VD 3.3V digital supply Always
J3.9 VD1 Not used No
J3.10 +5VD +5V Used to ge10V/–10V
The 1.8V for DVDD comes from the voltage regulator U16 using 3.3V as the source voltage input.
All of the power supplies AVDD (+5V), DVDD (1.8V), and IOVDD (3.3V) have corresponding jumpers J10,
J11 (AVDD), J13 (DVDD) and J14 (IOVDD) that can be replaced with a current meter to measure the
respective supply currents.
J15 and J16 require a jumper to select the voltage used by the onboard amplifiers. The external voltages
can range from 10V to 15V. The onboard voltage is always 10V.
Table 5 and Table 6 list the options for
J15 and J16, respectively. Figure 2 shows the pinout for connectors J15 and J16.
SBAU129C – November 2007 – Revised July 2008 ADS1178EVM, ADS1278EVM, ADS1178EVM-PDK, and ADS1278EVM-PDK 7
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