Voltage Reference - Texas Instruments ADS1263EVM-PDK User Manual

Analog Interface

3.4 Voltage Reference

The ADS1263 can accept an external reference in addition to the internal and supply reference options. The
external reference inputs are shared with pins AIN0 through AIN5. See
correspond to RMUXP and RMUXN. ADC1 and ADC2 can share a reference source, though an independent
reference source can be selected for ADC2.
Figure 3-12 shows that the ADS1263EVM also includes an optional external voltage reference circuit that is not
installed by default.
AVDD
DNP
GND
Figure 3-12. ADS1263EVM External Voltage Reference Circuit (Optional)
The external reference circuit includes several resistors and capacitors that are not installed by default. A
discrete voltage reference is also required. The recommended component is Texas Instruments' REF7025. This
voltage reference offers very low noise, a very low temperature drift coefficient (2 ppm/°C), and high accuracy
(±0.025%). Use the REF7025 with the ADS1263 in precision applications where performance is critical. The
REF7025 output voltage is connected to analog inputs AIN0 and AIN1.
16 ADS1263EVM-PDK Evaluation Module
U4
2
VIN OUTF
OUTS
C29
2.2uF
DNP
GND
GND
GND
1
EN GND
REF7025QDGKR
Copyright © 2023 Texas Instruments Incorporated
Table 3-1
R42 0
7
DNP
6
C30
DNP
22uF
3
R41
4
DNP
0.01
5
8 R43 0
DNP
GND
www.ti.com
to determine which pins
TP7
REFP
REFP
TP8
REFN
REFN
SBAU206B – APRIL 2015 – REVISED MAY 2023
Submit Document Feedback