Overview
The PGA970QPHPR is a highly integrated system-on-chip LVDT (Linear Variable Differential Transformer) sensor-signal conditioner developed by Texas Instruments. This device is designed with advanced signal-processing capabilities, making it suitable for a variety of precision sensing applications. It features a three-channel, low-noise, programmable-gain analog front end that allows direct connection to the sense element, followed by three independent 24-bit delta-sigma ADCs. The PGA970QPHPR also includes a digital signal-demodulation block interfaced with an integrated ARM-Cortex M0 MCU, enabling the implementation of custom sensor-compensation algorithms stored in the device's nonvolatile memory.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HTQFP (PHP) | - |
| Pins | 48 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Operational Supply Range | 3.5 to 30 | V |
| ADC Resolution | 24-bit | - |
| Auxiliary ADC Resolution | 24-bit | - |
| Output DAC Resolution | 14-bit | - |
| Microcontroller | ARM Cortex-M0 | - |
| Program Memory | 16KB FRAM | - |
| General-Purpose RAM | 2KB | - |
| Waveform Generator Look-Up Table RAM | 512B | - |
| On-Chip Oscillator Frequency | 8 MHz | - |
| Communication Interfaces | SPI, OWI, GPIO, PWM | - |
Key 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
- 8-MHz on-chip oscillator
- Peripheral Features:
- Serial peripheral interface (SPI)
- One-wire interface (OWI)
- Ratiometric and absolute voltage output
- General Features:
- Operational supply range: 3.5 V to 30 V
- Ambient temperature range: –40°C to +125°C
- DMOS gate controller for extended supply range >30 V
Applications
- Position sensor signal conditioning
- Linear Variable Differential Transformer (LVDT)
- Rotational Variable Differential Transformer (RVDT)
- Resolver
- RLC measurement
Q & A
- What is the PGA970QPHPR used for?
The PGA970QPHPR is used for LVDT sensor signal conditioning, providing advanced signal-processing capabilities for precision sensing applications.
- What is the package type of the PGA970QPHPR?
The PGA970QPHPR comes in a HTQFP (PHP) package with 48 pins.
- What is the operational temperature range of the PGA970QPHPR?
The operational temperature range is –40°C to +125°C.
- What are the key analog features of the PGA970QPHPR?
The key analog features include a programmable-gain analog front end, excitation waveform generator and amplifier, dual 24-bit ADC with amplitude and phase demodulators, and a 14-bit output DAC with programmable gain.
- What type of microcontroller is integrated into the PGA970QPHPR?
The PGA970QPHPR includes an ARM Cortex-M0 microcontroller.
- What are the communication interfaces available on the PGA970QPHPR?
The device supports SPI, OWI, GPIO, and PWM communication interfaces.
- What is the purpose of the DMOS gate controller in the PGA970QPHPR?
The DMOS gate controller is used to regulate the device supply voltage in systems where the supply voltage exceeds 30 V.
- How does the PGA970QPHPR support external system communication?
External system communication is achieved through SPI, OWI, GPIO, or PWM digital interfaces.
- What types of diagnostics are built into the PGA970QPHPR?
The device includes built-in diagnostics, sensor diagnostics, and an integrated temperature sensor to ensure system integrity.
- What is the resolution of the ADCs in the PGA970QPHPR?
The PGA970QPHPR features dual 24-bit ADCs with amplitude and phase demodulators.
