PGA970 is an LVDT sensor signal conditioner
The PGA970 is a highly integrated system-on-chip LVDT sensor signal conditioner with advanced signal processing capabilities. It 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.
In addition, the device contains a digital signal demodulation module that interfaces with the integrated ARM-Cortex M0 MCU, allowing the implementation of custom AD5220BRM100 sensor compensation algorithms stored in the device's non-volatile memory. External system communication is achieved using any SPI, OWI, GPIO or PWM digital interface. The analog output provides reference or absolute voltage output via a 14-bit DAC and programmable gain amplifier. Sensing element excitation is achieved using an integrated waveform generator and waveform amplifier. The waveform signal data is user-defined and stored in the designated RAM memory area.
In addition to the main functional components, the PGA970 is also equipped with additional support circuitry. Device diagnostics, sensor diagnostics, and integrated temperature sensors provide protection and information about the integrity of the entire system and sensing elements. The device also includes a gate controller circuit that, when used with an external depletion-mode MOSFET, can regulate the device supply voltage in systems with supply voltages in excess of 30 V.
characteristic:
●Simulation function
○ Programmable gain analog front end for LVDT sensors
○Excitation waveform generator and amplifier
○Dual 24-bit ADC with amplitude and phase demodulator
○24-bit auxiliary ADC
○ On-chip internal temperature sensor
○ 14-bit output DAC with programmable gain
○Built-in diagnostics
●Digital function
○ARM ? Cortex ? -M0 microcontroller
○16KB Ferroelectric RAM (FRAM) program memory
○2KB general purpose RAM
○512B RAM Waveform Generator Lookup Table
○8MHz on-chip oscillator
●Peripheral functions
○Serial Peripheral Interface (SPI)
○One-Wire Interface (OWI)
○ Ratiometric and absolute voltage output
●General Features
○ Operating power 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
parameter:
Operating temperature range (°C): -40 to 125
VS (min) (V): 3.5
Interface Type: SPI, OWI and Voltage Output
VS (max) (V): 30
Resolution (bits): 24
