Texas Instruments DAC8771EVM, User Manual, Page: 7 / 24

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EVM Hardware Overview
7 SLAU727 – August 2017
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DAC8771 Evaluation Module
2.5.2 Reference Voltage
The DAC8771 reference voltage can be supplied by the internal voltage reference, by the onboard
REF5050, or by an external reference voltage.
Figure 5. Onboard Reference Supply Connections
To use the internal reference voltage, place JP11 in the 1-2 position. To use the REF5050 reference
voltage, place JP11 in the 2-3 position and connect a supply voltage for the REF5050 to J6, as shown in
Figure 5 . To use an external reference voltage, remove JP11 and the reference can be connected to the
DAC8771EVM through the center post of JP11.
2.5.3 VOUT, VSENSEP, and VSENSEN
The VOUT pins can be accessed on terminal block J7, by the OUT test points. The VSENSEP and
VSENSEN sense connections may be provided onboard or externally closer to the point of load through
terminal block J7. To provide the VSENSEP connections onboard, install JP3. Similarly, to provide the
VSENSEN connections onboard, install JP8. Removing these jumpers requires that the sense connections
are made external to the EVM board.
Figure 6 shows the arrangement of the output terminal blocks.
2.5.4 IOUT
The IOUT pin can be accessed on terminal block J7 or by the test point OUT.
2.5.5 Onboard Output Loads
Four load choices are installed on the EVM board to evaluate the voltage and current outputs as well as
the adaptive power management performance of the DAC8771. JP4 is available to provide a short-circuit
condition on the output. JP5 provides a 250-
Ω load on the output. JP6 provides a 625- Ω on the output.
JP7 provides a 1-k
Ω
load on the output.
Figure 6. Output Terminal Block Connections and Load Jumpers