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EVM Hardware Overview
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SBAU248 – November 2016
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Copyright © 2016, Texas Instruments Incorporated
DAC8775EVM User’s Guide
2.5.2
Reference Voltage
The DAC8775 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 JP10 in the 1-2 position. To use the REF5050 reference
voltage, place JP10 in the 2-3 position and connect a supply voltage for the REF5050 to J9, as shown in
Figure 5
. To use an external reference voltage, remove JP10 and the reference can be connected to the
DAC8775EVM through the center post of JP10.
2.5.3
VOUT_X, VSENSEP_X, and VSENSEN_X
The VOUT_X pins can be access on terminal blocks J5, J6, J7, and J8 or by the OUT_A, OUT_B,
OUT_C, or OUT_D test points. The VSENSEP_X and VSENSEN_X sense connections may be provided
onboard or externally closer to the point of load through terminal blocks J5, J6, J7, or J8. To provide the
VSENSEP_X connections onboard, install JP16, JP17, JP30, or JP31 based on the channel of interest.
Similarly, to provide VSENSEN_X connections onboard, install JP26, JP27, JP40, or JP41. 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_X
The IOUT_X pins can be accessed on terminal blocks J5, J6, J7, or J8 or by the test points OUT_A,
OUT_B, OUT_C, or OUT_D.
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 DAC8775. JP18, JP22, JP32, or JP36 are available
to provide a short-circuit condition on the outputs. JP19, JP23, JP33, or JP37 provide a 250-
Ω
load on the
outputs. JP20, JP24, JP34, or JP38 are available to provide a 625-
Ω
on the outputs. JP21, JP25, JP35, or
JP39 provides a 1-k
Ω
load on the outputs.