The PGA970 device 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
sense element, followed by three independent 24-bit delta-sigma ADCs.
Further, the device contains a digital signal-demodulation block that interfaces to an
integrated ARM-Cortex M0 MCU, allowing implementation of custom sensor-compensation algorithms
stored in the device nonvolatile memory. External system communication is achieved by using any of
the SPI, OWI, GPIO, or PWM digital interfaces. 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 the use of an integrated waveform generator and waveform amplifier. The
waveform signal data is user-defined and stored in a designated RAM memory area.
Besides the primary functional components, the PGA970 device is
equipped with additional support circuitry. The device diagnostics, sensor diagnostics, and
integrated temperature sensor provide protection and information about the integrity of the overall
system and sensing element. The device also includes a gate-controller circuit which when used with
an external depletion MOSFET can regulate the device supply voltage in systems where the supply
voltage exceeds 30 V.
For all available packages, see the orderable addendum at the
end of the data sheet.
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