The PGA302 is a low-drift, low-noise,
programmable signal-conditioner device designed for a variety of resistive bridge-sensing
applications like pressure-, temperature-, and level-sensing applications. The PGA302 can also
support flow metering applications, weight scale and force-sensing applications that use strain
gauge load cells, and other general resistive bridge signal-conditioning applications.
The PGA302 provides a bridge excitation
voltage of 2.5 V and a current output source with programmable current output up to 1 mA. At the
input, the device contains two identical analog front-end (AFE) channels followed by a 16-bit
Sigma-Delta ADC. Each AFE channel has a dedicated programmable gain amplifier with gain up to 200
In addition, one of the channels integrates a sensor offset
compensation function while the other channel integrates an internal temperature sensor.
At the output of the device, a 1.25-V, 14-bit DAC is followed by a
ratiometric-voltage supply output buffer with gain of 4 V/V allowing a 0-5V ratiometric voltage
system output. The PGA302 device implements a third-order temperature
coefficient (TC) and non-linearity (NL) digital compensation algorithm to calibrate the analog
output signal. All required parameters for the linearization algorithm as well as other user data
is stored in the integrated EEPROM memory.
For system connectivity the PGA302 device
integrates an I2C Interface as well as a one-wire interface (OWI) that
supports communication and configuration through the power-supply line during final system
calibration process. Diagnostics are implemented at the excitation output sources, the input to the
AFE and the power supplies in the device. System Diagnostics like sensor open / short are also
PGA302 accommodates various sensing element
types, such as piezoresistive, ceramic film, 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.
View datasheet View product folder