Texas Instruments PGA970 LVDT Sensor Signal Conditioner
Texas Instruments PGA970 LVDT Sensor Signal Conditioner is a highly integrated system-on-chip LVDT sensor-signal conditioner with advanced signal-processing capabilities. The PGA970 contains a three-channel, low-noise, programmable-gain, analog front end that allows direct connection to the sensing element, followed by three independent 24-bit delta-sigma ADCs. The Texas Instruments PGA970 also contains a digital signal-demodulation block that interfaces to an integrated Arm®-Cortex® M0 MCU, allowing custom sensor-compensation algorithms to be implemented in the device's non-volatile memory. External system communication is achieved using SPI, OWI, GPIO, or PWM digital interfaces. The analog output is supported through a 14-bit DAC and programmable-gain amplifier offering reference or absolute-voltage output. Sensing-element excitation is achieved by using an integrated waveform generator and waveform amplifier. The waveform signal data is user-defined and stored in a designated RAM memory area.
Features
- Analog features
- Programmable-gain Analog Front End for LVDT sensors
- Excitation waveform generator and amplifier
- Dual 24-bit ADC with amplitude and phase demodulators
- 24-bit auxiliary ADC
- On-chip internal temperature sensor
- 14-bit output DAC with programmable gain
- Built-in diagnostics
- Digital features
- Arm Cortex-M0 microcontroller
- 16KB ferroelectric RAM (FRAM) program memory
- 2KB general-purpose RAM
- 512B RAM waveform-generator look-up table
- 8MHz on-chip oscillator
- Peripheral features
- Serial Peripheral Interface (SPI)
- One-Wire Interface (OWI)
- Ratiometric and absolute voltage output
- General features
- 3.5V to 30V operational supply range
- –40°C to +125°C ambient temperature range
- DMOS gate controller for extended supply range > 30V
Applications
- Position sensor signal conditioning
- Linear Variable Differential Transformer (LVDT)
- Rotational Variable Differential Transformer (RVDT)
- Resolver
- RLC measurement
Simplified Diagram
Additional Resources
Paskelbta: 2017-07-21
| Atnaujinta: 2023-10-27