ADSxx54EVM-PDK Kit Operation
3. The ADSxx54 device incorporates two internal programmable 2.5-V reference sources. When selecting
the dual, internal programmable reference, independently change the voltages at VREF_A and
VREF_B by writing to user-programmable registers REFDAC_A and REFDAC_B. The
Vref Value-ADC
A
and
Vref Value-ADC B
control panels contain the REFDAC_x register settings. The reference
voltage can be programmed in the range of 2.5 V to 2.0 V by entering the REFDAC_x register value in
the control panel and clicking the
Write REFDAC_x
button.
shows the internal reference
Vref
Value-ADC x
control panels in the
ADSxx54EVM Settings
page of the GUI.
Figure 17. Programming the REFDAC Registers in the ADSxx54EVM
4. Scroll down in the
ADSxx54EVM Settings
page and find the
Input Range Selection [CFR, Bit[9]]
button
to select the ±1 × V
ref
range mode or ±2 × V
ref
range mode. Jumpers JP5 and JP6 must be installed
when selecting the ±1 × V
ref
range. Uninstall jumpers JP5 and JP6 when selecting the ±2 × V
ref
range
mode . The GUI displays the appropriate JP5 and JP6 jumper settings, as shown in
Figure 18. Selecting ±1 × V
ref
Range or ±2 × V
ref
Range
17
SBAU209 – April 2014
ADS8354EVM-PDK and ADS7854EVM-PDK
Copyright © 2014, Texas Instruments Incorporated