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OPA189IDBVT Datasheet(PDF) 33 Page - Texas Instruments

Part # OPA189IDBVT
Description  OPAx189 Precision, Lowest-Noise, 36-V, Zero-Drift, 14-MHz, MUX-Friendly, Rail-to-Rail Output Operational Amplifiers
PDF  58 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

OPA189IDBVT Datasheet(HTML) 33 Page - Texas Instruments

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9.3 System Examples
9.3.1 24-Bit, Delta-Sigma, Differential Load Cell or Strain Gauge Sensor Signal Conditioning
OPAx189 is used in a 24-bit, differential load cell or strain gauge sensor signal conditioning system alongside the
ADS1225. A pair of OPAx189 amplifiers are configured in a two-amp instrumentation amplifier (IA) configuration
and are band-limited to reduce noise and allow heavy capacitive drive. The load cell is powered by an excitation
voltage (denoted VEX) of 5-V and provides a differential voltage proportional to force applied. The differential
voltage can be quite small and both outputs are biased to VEX / 2.
In this example the OPAx189 is employed here due to the excellent input offset voltage (0.4 µV) and input offset
voltage drift (0.005 µV/°C), the low broadband noise (5.2 nV/√ Hz) and zero-flicker noise, and excellent linearity
and high input impedance. The two-amp IA configuration removes the dc bias and amplifies the differential
signal of interest and drives the 24-bit, delta-sigma ADS1225 analog-to-digital converter (ADC) for acquisition
and conversion. The ADS1225 features a 100-SPS data rate, single-cycle settling, and simple conversion control
with the dedicated START pin.
ADS1225
AVDD
DVDD
GND
GND
BUFEN
TEMPEN
MODE
+3V
+5V
+3V
MSP430xxx
or other host
DVDD
VREFP
VREFN
C5
0.1 µF
C4
0.1 nF
C6
0.1 nF
GND
GND
SCLK
DRDY / DOUT
START
OPAx189
±
+
+15V
RF
10 k
CF
1 µF
GND
OPAx189
±
+
+15V
RF
10 k
CF
1 µF
GND
RG
50
Load Cell
±OUT
+OUT
GND
+
±
GND
VEX
RTRACE
+SENSE
-SENSE
C2
1 µF
R2
1 k
R1
1 k
C1
10 µF
C3
10 µF
GND
AINP1
AINN1
GND
RTRACE
+5V
Copyright © 2017, Texas Instruments Incorporated
G = 1 +
2 ® RF
R
G
Figure 9-8. 24-Bit, Differential Load Cell or Strain Gauge Sensor Signal Conditioning Schematic
www.ti.com
OPA189, OPA2189, OPA4189
SBOS830I – SEPTEMBER 2017 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
33
Product Folder Links: OPA189 OPA2189 OPA4189



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