Power Supplies; P3 Configuration: Power-Supply Interface Header - Texas Instruments ADS794x EVM Series User Manual

Power Supplies

4 Power Supplies
P3 is the power-supply input connector.
Pin Number
P3.3
P3.5
P3.6
P3.7
P3.9
P3.10
P3.1-2, P3.4, and
P3.7-8
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 either +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.
Digital supply and reference voltage must be at or below the analog supply
voltage at all times.
8
ADS794xEVM and ADS794xEVM-PDK
Table 4
Table 4. P3 Configuration: Power-Supply Interface Header
Pin Name
+5VA
GND
GND
+1.8VD
+3.3VD
+5VD
Unused
Copyright © 2011, Texas Instruments Incorporated
lists the configuration details for P3.
Function
5-V analog supply
Digital ground input
Analog ground input
1.8-V digital supply
3.3-V digital supply
5-V digital supply
Unused
CAUTION
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Required
Yes
Yes
Yes
Yes/Optional
Yes/Optional
Yes/Optional
No
SBAU194 – August 2011
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