Texas Instruments ADS794xEVM, User Manual, Page: 8 / 31

Power Supplies
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8 SBAU194B – August 2011 – Revised September 2017
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ADS794xEVM and ADS794xEVM-PDK
4 Power Supplies
P3 is the power-supply input connector. Table 5 lists the configuration details for P3.
Table 5. P3 Configuration: Power-Supply Interface Header
Pin Number Pin Name Function Required
P3.3 +5VA 5-V analog supply Yes
P3.5 GND Digital ground input Yes
P3.6 GND Analog ground input Yes
P3.7 +1.8VD 1.8-V digital supply Yes/Optional
P3.9 +3.3VD 3.3-V digital supply Yes/Optional
P3.10 +5VD 5-V digital supply Yes/Optional
P3.1-2, P3.4, and P3.7-
8
Unused Unused No
4.1 Analog Power Options
The ADS794xEVM board is designed to work with a 5-V analog power supply connected to P3.3.
4.2 Digital Power Options
The ADS794xEVM uses a jumper in J3 to connect the digital power supply to 3.3 VD (P3.10) or +5
VD (P3.9). J3 in position 1-2 connects the digital power supply to +5 VD; position 2-3 connects the digital
power supply to +3.3 VD. Without a jumper in J3, the digital power supply can be connected to +1.8
VD(P3.7) with a jumper wire to pin J3.2. The jumper in J3 must always be in position 2-3 (+3.3 VD) while
using the MMB0 with the EVM.
4.3 Reference Voltages
The ADS794xEVM uses a jumper in J2 to select between the internal (REF5040) and external voltage
reference sources. J2 in position 1-2 selects the internal reference; position 2-3 selects the external
reference. The selected reference is cleaned with a RC filter and buffered with a OPA350 operational
amplifier.
CAUTION
Digital supply and reference voltage must be at or below the analog supply
voltage at all times.