Texas Instruments ADS131M04, User Manual, Page: 10 / 34

Power Supplies
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10 SBAU332A – March 2019 – Revised June 2019
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ADS131M04 Evaluation Module
4 Power Supplies
The PHI provides multiple power-supply options for the EVM, derived from the USB supply of the
computer.
The EEPROM on the ADS131M04EVM uses a 3.3-V power supply generated directly by the PHI. The
analog supply of the ADC is powered by the LP5907 onboard the EVM, which is a low-noise linear
regulator that uses the 5-V supply on the PHI to generate a cleaner 3.3-V output. The 3.3-V supply to the
digital section of the ADC is provided directly by an LDO on the PHI.
The power supply for each active component on the EVM is bypassed with a ceramic capacitor placed
close to that component. Additionally, the EVM layout uses thick traces or large copper fill areas, where
possible, between bypass capacitors and their loads to minimize inductance along the load current path.
As mentioned previously in Section 1 , power to the EVM is supplied by the PHI through connector J5. For
information about PHI pins and the power connections, see Table 5 .
With modifications, the user may use external supplies for either AVDD or DVDD. AVDD can be driven
externally by moving the jumper on JP9 to the left. This placement disconnects 3V3_LDO from AVDD.
Power can then be applied through the AVDD test point at TP2 or through 3V3_LP if connector J8 is
installed. DVDD can be driven externally from the DVDD test point at TP1 if R45 is removed from the
EVM.