Texas Instruments has introduced a single-supply, auto-zero bridge sensor amplifier. Featuring programmable gain and offset, the PGA308 amplifies the sensor signal and provides digital calibration for zero (offset) and span (gain). A one-wire, UART-compatible digital serial interface performs the calibration. At the heart of the device is a precision, low-drift and low-noise front-end programmable gain amplifier (PGA). Digitally programmable coarse offset, fine offset and selected gain (coarse and fine) may be controlled in realtime or permanently programmed into the PGA308. The device can store seven banks of one-time programmable (OTP) memory of gain and offset calibration parameters. A separate power-on reset OTP bank can be programmed up to four times. A fault monitor detects overload, burnout and system faults, while the over-/under-scale limits offer additional system-level diagnostics.
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