Texas Instruments ADS125H02 Quick Start Manual

Four-channel, differential input, DAQ front-end circuit with
Victor Salomon
Feature
Number of channels
Data rate
Voltage input range
Current input range
Voltage accuracy
Current accuracy
Design Description
This circuit design describes how to use an
amplifier (PGA) to make voltage and current measurements on various ranges.
This circuit can be used in applications such as
concentrators, lab and field
applications. Thermocouples and RTD are also common temperature sensors used in similar applications.
For more information about making precision ADC measurements with a variety of RTD wiring
configurations, see the
+
V = ± 10V
IN
-
+
V = ± 10V
IN
-
+
= 0 to 20 mA
I
IN
(V = 0 to 5V)
-
+
I = 0 to 20 mA
IN
(V = 0 to 5V)
-
SBAA386 – December 2019
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configurable voltage and current inputs
Power Supplies
AVDD
5.0V
instrumentation, and other
A Basic Guide to Thermocouple Measurements Application
15 V -15 V
0.1 F
Optional
TVS3300
Input Filter
TVS Protection
VDD VSS
210 1 k
S1A
MUX509
1 nF
10 nF
1 nF
S1B
210 1 k
210 1 k
S2A
1 nF
10 nF
1 nF
S2B
210 1 k
210 1 k
S3A
1 nF
10 nF
1 nF
S3B
210 1 k
210 1 k
S4A
1 nF
10 nF
1-of-4
Decoder
1 nF
S4B
210 1 k
GND
Four-channel, differential input, DAQ front-end circuit with configurable
Copyright © 2019, Texas Instruments Incorporated
Analog Engineer's Circuit: Data
Value
4
≤ 10
±10.0
0 to 20
0.05 typical | 0.10 maximum
0.10 typical | 0.20 maximum
HV-AVDD
15.0V
ADS125H02 with integrated reference and programmable gain
analog input modules
factory automation
15 V -15 V
0.1 F 0.1 F 0.1 F
1 F
TVS3300
HV_AVDD HV_AVSS AVDD
ADS125H02
Supply
Read
Temp
Sensor
DA AIN0
DB AIN1
AINCOM
MUX
A0 GPIO0
A1 GPIO1
GPIO
EN GPIO2
AGND DGND
Converters
SBAA386 – December 2019
Units
Differential channels
kSPS
Volts
mA
%FS
%FS
HV-AVSS
–15.0V
for PLCs, avionics remote data
and test and measurement
Report.
5 V 5 V
1 F 1 F 10 F
DVDD REFOUT REFP0 REFP1
2.5-V
REF
PGA Gain Options
Reg. MODE4 - GAIN[3:0]
0000: 0.125 0110: 4
REF MUX
0001: 0.1875 0111: 8
0010: 0.25 1000: 16
0011: 0.5 1001: 32
BUF
0100: 1 1010: 64
0101: 2 1011: 128
24-Bit
PGA
û ADC
CAPP CAPN BYPASS
1 F
1 nF C0G
voltage and current inputs
1