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Bridge amplifier circuit
CIRCUIT060006
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Key Document
- Single-supply strain gauge bridge amplifier circuit
(PDF 208 KB)
30 Dec 2017
- Strain gauge bridge amplifier circuit with MSP430 smart analog combo
(PDF 569 KB)
29 Oct 2019
Description
A strain gauge is a sensor whose resistance varies with applied force. To measure the variation in resistance, the strain gauge is placed in a bridge configuration. This design uses a 2 op amp instrumentation circuit to amplify a differential signal created by the change in resistance of a strain gauge. By varying R10, a small differential voltage is created at the output of the Wheatstone bridge which is fed to the 2 op amp instrumentation amplifier input.
Features
- Single 5V supply with half-supply reference
- Input: -2.22mV to 2.27mV differential
- Output: 225mV - 4.72V
- Strain gauge resistance variation: 115 - 125 Ohms
- Gain: 1001V/V
Technical Documents
Application notes (6)
| Title | Type | Size (KB) | Date |
|---|---|---|---|
| 569 | 29 Oct 2019 | ||
| 440 | 24 Oct 2019 | ||
| 147 | 31 Dec 2018 | ||
| 192 | 31 Dec 2018 | ||
| 155 | 30 Dec 2017 | ||
| 208 | 30 Dec 2017 |
User guides (1)
| Title | Type | Size (KB) | Date |
| 861 | 02 Nov 2015 |
Solution guides (1)
| Title | Type | Size (KB) | Date |
| 11259 | 18 Feb 2019 |
Related Products
Development Tools (2)
| Name | Part Number | Tool Type |
|---|---|---|
| Analog engineer's calculator | ANALOG-ENGINEER-CALC | Calculation Tools |
| SPICE-based analog simulation program | TINA-TI | Circuit Design & Simulation |
TI Devices (6)
| Part Number | Name | Product Family |
|---|---|---|
| MSP430FR2310 | 16 MHz Ultra-Low-Power Microcontroller - 2 KB FRAM, 1 KB SRAM, 16 IO, 8ch 10-bit ADC, OpAmp, TIA | Microcontrollers (MCU) |
| MSP430FR2311 | 16 MHz Ultra-Low-Power Microcontroller - 4 KB FRAM, 1 KB SRAM, 16 IO, 8ch 10-bit ADC, OpAmp, TIA | Microcontrollers (MCU) |
| MSP430FR2353 | 24MHz 105C ULP Microcontroller With 16 KB FRAM, 2 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA | Microcontrollers (MCU) |
| MSP430FR2355 | 24MHz 105C ULP Microcontroller With 32 KB FRAM, 4 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA | Microcontrollers (MCU) |
| OPA376 | Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp | Operational amplifiers (op amps) |
| TLV9002 | 2-Channel, 1MHz, RRIO, 1.8V to 5.5V Operational Amplifier for Cost-Optimized Systems | Operational amplifiers (op amps) |
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