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3 Analog Interface
The ADS1263EVM supports a wide variety of analog input configurations. Additional functionality enables
precise measurement of many sensor types. The following sections discuss these features in more detail.
3.1 Analog Input Options
The ADS1263 has a total of 11 analog input pins: AIN0 through AIN9 plus a common input, AINCOM. This
design allows the ADS1263 to be configured for up to five differential input pairs, 10 single-ended inputs
referenced to a common voltage, or a combination of single-ended and differential inputs. The flexible input
multiplexer of the ADS1263 allows any two inputs to be selected for either the positive or negative ADC input.
Any AINx pin can be used as a common input when measuring single-ended signals. However, AINCOM is
specifically designed to serve this purpose because AINCOM can provide a bias voltage (level-shift function).
This voltage biases floating sensors to help meet the common-mode voltage requirements of the AD1263 PGA.
All ADC analog inputs are pinned out on the ADS1263EVM. The supporting circuitry provides filtering and
ratiometric connections for a variety of sensors. Additionally, terminal block J4 can be used for thermocouple
inputs (see
Section
3.1.2.1). Terminal block J5 shows the connection and input filter for AINCOM.
shows the schematic of the ADS1263EVM analog input circuitry.
J6
AVDD
AVDD
1
GND
2
GND
J3
AIN0
1
AIN1
2
3
AIN2
AIN3
4
AIN4
5
AIN5
6
AIN6
7
8
AIN7
J4
AIN8
1
AIN9
2
R21
1.00k
J5
1
AINCOM
REFOUT
2
REFOUT
Figure 3-1. ADS1263EVM Analog Input Channels and Filtering
SBAU206B – APRIL 2015 – REVISED MAY 2023
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Input filtering
CM f-3dB = 1.06 MHz
DM f-3dB = 50 kHz
AVDD
R3
DNP
10M
R4
DNP
10M
GND
AINCOM
AINCOM
C21
150pF
GND
REFOUT
Copyright © 2023 Texas Instruments Incorporated
REFP
R5
1.00k
GND
REFN
R6
1.00k
R7
1.00k
GND
R8
1.00k
R9
1.00k
R1
GND
DNP
4k
R10
1.00k
DNP
R2
REFOUT
620
R36
DNP
0
GND
R11
1.00k
R33
RT1
DNP
DNP
GND
10.0k
10k
R12
1.00k
R34
DNP
10.0k
GND
R13
1.00k
GND
R14
1.00k
ADS1263EVM-PDK Evaluation Module
Analog Interface
Figure 3-1
TP14
A0
C4
150pF
C15
1600pF
C5
150pF
TP15
A1
TP16
A2
C6
150pF
C16
1600pF
C7
150pF
TP17
A3
TP18
A4
C8
150pF
C17
1600pF
C9
150pF
TP19
A5
TP20
A6
C10
150pF
C18
C11
1600pF
150pF
TP21
A7
TP22
A8
C12
150pF
C19
C13
1600pF
150pF
TP2
A9
5
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