Voltage Reference Options; Figure 3-3. Ads1X48Evm Vref Options (Yellow) And Test Points (Red); Table 3-1. Summary Of Ads1X48Evm Vref Options - Texas Instruments ADS1x48EVM User Manual

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3.2 Voltage Reference Options

The ADS1x48 is a highly flexible ADC that can accept multiple voltage reference (VREF) options. First, the
ADS1x48 integrates a low-noise, 2.048-V reference to help reduce overall component count. Moreover, this
internal VREF voltage is supplied externally via the ADS1x48 REFOUT pin and is available on terminal block J5.
The ADS1x48 also has two sets of differential VREF inputs defined as REFP0, REFN0 and REFP1, REFN1. All
of these options are selected via the MUX1 register in the ADS1x48.
The ADS1x48EVM supports four different VREF options to offer maximum flexibility.
options. Figure 3-3 shows the location of each VREF option (highlighted in yellow) as well as each VREF test
point (highlighted in red).
VREF Mode
Internal
REF5025
External Ratiometric
User-provided

Figure 3-3. ADS1x48EVM VREF Options (Yellow) and Test Points (Red)

SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
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Table 3-1. Summary of ADS1x48EVM VREF Options

VREF Input
Voltage
Channel
— 2.048 V
REFP0, REFN0 2.5 V
REFP1, REFN1 Variable
REFP1, REFN1 Variable
Copyright © 2022 Texas Instruments Incorporated
Table 3-1
Location Test Point
Output on J5
U3
(REFOUT)
Output on J5
U2
(REF5025)
R11 REFP1, REFN1
J6 (REFP1,
REFP1, REFN1
REFN1)
ADS1x48EVM Evaluation Module
ADS1x48EVM Overview
details these four
Comment
—
—
Used for RTD
measurements
Remove R11
9