Sensor signal conditioner designed for variety of resistive bridge-sensing applications

The Texas Instruments PGA302 is a low-noise, low-drift, programmable signal-conditioner device created for a variety of resistive bridge-sensing applications like pressure, temperature, and level-sensing applications. The device can also maintain weight scale and force-sensing applications, and flow metering applications, that use strain gauge load cells, and other common resistive bridge signal-conditioning applications. The device provides a bridge excitation voltage of 2.5V and a current output source with programmable current output up to 1mA. At the input, the device includes two identical AFE channels followed by a 16-bit Sigma-Delta ADC. Each AFE channel has a dedicated programmable gain amplifier with gain up to 200 V/V. Also, one of the channels integrates a sensor offset compensation function while the other channel integrates an internal temperature sensor. The device accommodates several sensing element types, such as ceramic film, piezoresistive, strain gauge, and steel membrane. The device can also be used in accelerometer, humidity sensor signal-conditioning applications, as well as in some current-sensing, shunt-based applications.