Figure 2-2. Ads8354Evm Common-Mode Voltage Buffer - Texas Instruments ADS8354EVM-PDK User Manual

Analog Interface
As shown in Figure 2-2, the ADS8354EVM offers two options to provide the output common-mode voltage
(VOCM) of the THS4561 amplifiers. By default, JP7 and JP8 are left open and JP5 and JP6 are installed. This
configuration selects the ADS8354 internal reference voltage (REFIO_A and REFIO_B) and divides the output
by 2 to use REFIO_y / 2 as VOCM (y = A or B), which is required for the default input range of ±VREF. When
using the 2xVREF input range, uninstall the jumpers on JP5 and JP6 such that VOCM = REFIO_y.
Alternatively, the REF6025 (U1) can be used in place of the REFIO_A, REFIO_B voltage to serve as the ADC
reference and to set the VOCM voltage. Disable the internal reference voltage on the ADS8354 by setting the
REF_SEL bit in the CFG register to 0b (external reference) and install jumpers on JP7 and JP8.
Figure 2-2. ADS8354EVM Common-Mode Voltage Buffer Circuit
6 ADS8354EVM-PDK Evaluation Module
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to REFIO_A
on ADS8354
to REFIO_B
on ADS8354
SBAU407 – APRIL 2023
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