Resistive sensing conditioner speeds parameter measurement

28th October 2015

Mick Elliott

0 0

Datasheet

The PGA900 programmable resistive sensing conditioner from Texas Instruments (TI) is now being shipped by Mouser Electronics. The device is the industry's highest resolution resistive sensing signal conditioner, enabling fast and precise 24-bit measurement of parameters such as pressure, strain, flow, or liquid levels.

The sensing conditioner manipulates its input signals by amplification and digitisation through two analogue front end channels, each containing a low-noise 24-bit analogue-to-digital converter (ADC), to enable high-resolution signal acquisition.

The device also includes a 14-bit digital-to-analogue converter (DAC) to provide highly linear analogue outputs, and a variety of output interfaces — including analogue voltage, 4-20 mA current loop, SPI, I2C, UART, and one-wire interface (OWI) — to give designers options for different application needs.

The signal conditioner offers a programmable ARM Cortex-M0 core, enabling flexible linearisation and temperature compensation for numerous resistive bridge sensing applications. The PGA900 offers integrated power management that accepts external power supply voltages from 3.3 V to 30 V to simplify design.

Low-drift voltage reference of 10 ppm/°C (maximum) enables high accuracy across the -40 degrees Celsius to +150 degrees Celsius operating temperature range.

Mouser is also stocking the TI PGA900EVM evaluation module, which enables designers to quickly and easily evaluate the features of the PGA900 conditioner in either voltage mode or current mode.

The PGA900EVM has an onboard resistive bridge with a potentiometer, letting designers adjust differential input voltages to emulate a pressure sense element. The PGA900EVM also includes a 7.5V regulator for one-time programmable (OTP) memory.