The PGA309 is a programmable analog signal conditioner designed for bridge sensors. The
analog signal path amplifies the sensor signal and provides digital calibration for zero, span,
zero drift, span drift, and sensor linearization errors with applied stress (pressure, strain,
etc.). The calibration is done via a One-Wire digital serial interface or through a Two-Wire
industry-standard connection. The calibration parameters are stored in external nonvolatile memory
(typically SOT23-5) to eliminate manual trimming and achieve long-term stability.
The all-analog signal path contains a 2x2 input multiplexer (mux), auto-zero
programmable-gain instrumentation amplifier, linearization circuit, voltage reference, internal
oscillator, control logic, and an output amplifier. Programmable level shifting compensates for
sensor dc offsets.
The core of the PGA309 is the precision, low-drift, no 1/f noise Front-End PGA
(Programmable Gain Amplifier). The overall gain of the Front-End PGA + Output Amplifier can be
adjusted from 2.7V/V to 1152V/V. The polarity of the inputs can be switched through the input mux
to accommodate sensors with unknown polarity output. The Fault Monitor circuit detects and signals
sensor burnout, overload, and system fault conditions.
For reference application information, see the commercial device
PGA309 User's Guide (SBOU024) available for download at
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